Traxxas 4909 User Manual

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Page 1

MODEL 4908

owners manual

Page 2

INTRODUCTION

CONTENTS

BEFORE YOU PROCEED SAFETY PRECAUTIONS TOOLS, SUPPLIES AND REQUIRED EQUIPMENT ANATOMY OF YOUR T-MAXX 3.3 QUICK START: GETTING UP TO SPEED GLUING THE TIRES AND DECORATING YOUR T-MAXX 3.3

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INTRODUCTION

Thank you for purchasing the new T-Maxx 3.3. This T-Maxx is our biggest and meanest Maxx ever and we are condent it will reward you with many hours of exciting monster truck action.

We know you’re excited about getting your new T-Maxx 3.3 on the road, but it’s very important that you take some time to read through the Owners Manual. This manual contains all the necessary set-up, break-in, tuning, and operating procedures that allow you to unlock the incredible performance and adjustment potential that Traxxas engineers designed into T-Maxx 3.3. Even if you are an experienced

R/C enthusiast, it’s important to read and follow the procedures in this manual. T-Maxx 3.3 contains new technologies in the engine, suspension, and transmission operation that you may not be familiar with. Pay particular attention to the fuel and break-in requirements for the engine. The advanced design of the TRX 3.3 Racing Engine

has a special break-in procedure that has been developed and proven to produce the best-performing engine possible. Using traditional or old-fashioned procedures could reduce engine performance and longevity.

T-Maxx 3.3 is made to be a complete package that starts with the highest level of engineering; a professionally produced DVD to acquaint you with the starting, racing, and maintenance procedures; and is equipped stock with the most powerful Ready-To-Race® engine available. We want you to feel condent that you own the best-performing truck in the market and that it is backed by a team of professionals who aim to provide the highest level of factory support possible. T-Maxx 3.3 is about experiencing total performance and satisfaction, not just with your truck, but also with the company that stands behind it.

Thank you again for going with Traxxas. We work hard every day to assure you the highest level of customer satisfaction possible. We truly want you to enjoy your new T-Maxx 3.3!

THE TRAXXAS TQ-3 RADIO SYSTEM THE TRX 3.3 RACING ENGINE DRIVING YOUR T-MAXX 3.3 TUNING ADJUSTMENTS MAINTAINING AND STORING YOUR T-MAXX 3.3 TROUBLESHOOTING INDEX

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Traxxas Support

Traxxas support is with you every step of the way. Refer below to nd out how to contact us and what your support options are.

Quick Start

This manual is designed with a Quick Start path that outlines the necessary procedures to get your model up and running in the shortest time possible. If you are an experienced R/C enthusiast you will nd it helpful and fast. Be sure and read through the rest of the manual to learn about important safety, maintenance, and adjustment procedures. Turn to page 6 to begin.

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BEFORE YOU PROCEED

Carefully read and follow all instructions in this and any accompanying materials to prevent serious damage to your T-Maxx 3.3. Failure to follow these instructions will be considered abuse and/or neglect.

Before running your T-Maxx 3.3, look over this entire manual and examine the truck carefully. If for some reason you decide the T-Maxx

3.3 is not what you wanted, then do not continue any further. Your hobby dealer absolutely cannot accept a T-Maxx 3.3 for return or exchange after it has been run.

Warnings, Helpful Hints, & Cross-References

Throughout this manual, you’ll notice warnings and helpful hints identied by the icons below. Be sure to read them!

An important warning about personal safety or avoiding damage to your model and related components.

Special advice from Traxxas to make things easier and more fun.

Refers you to a page with a related topic.

T-MAXX 3.3 OWNERS MANUAL

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SUPPORT

If you have any questions about your T-Maxx 3.3 or its operation, call the Traxxas Technical Support line toll-free at: 1-888-TRAXXAS (1-888-872-9927)*

Technical support is available Monday through Friday from 8:30 am to 9:00 pm central time. Technical assistance is also available at www.Traxxas.com. You may also e-mail customer support with your question at support@Traxxas.com. Join hundreds of Traxxas R/C enthusiasts in our online community at www.Traxxas.com.

Traxxas offers a full-service, on-site repair facility to handle any of your Traxxas service needs. Maintenance, replacement parts, and accessories may be purchased directly from Traxxas by phone or online at www.BuyTraxxas.com. You can save time, along with shipping and handling costs, by purchasing replacement parts from your local dealer. Do not hesitate to contact us with any of your product support needs. We want you to be thoroughly satised with your new T-Maxx 3.3!

Page 3

INTRODUCTION

SAFETY PRECAUTIONS

All of us at Traxxas want you to safely enjoy your new T-Maxx 3.3. Operate your T-Maxx 3.3 sensibly and with care, and it will be exciting, safe, and fun for you and those around you. Failure to operate your T-Maxx 3.3 in a safe and responsible manner may result in property damage and serious injury. The precautions outlined in this manual should be strictly followed to help ensure safe operation. You alone must see that the instructions are followed and the precautions are adhered to.

Important Points to Remember

• T-Maxx 3.3 is very fast! The T-Maxx 3.3 is intended for experienced users with a high level of skill. The TRX 3.3 Racing Engine is extremely powerful and may require skilled driving to maintain control.

• The engine, brakes, and exhaust system may become extremely hot during use. Be careful not to touch the parts, especially when refueling or stopping the engine.

• Model engine fuel is dangerous and highly poisonous. Always follow all directions and precautions printed on the fuel container. Model engine fuel is poisonous to humans and animals. Drinking the fuel can cause blindness and death. Handle with care and respect.

• Model engine fuel, especially when in a fuel dispensing bottle, may look like a cool drink to a child. Keep all fuel out of the reach of

children at all times. Do not place fuel containers on the ground where children can reach them while you are driving.

• Model engine fuel is ammable. Never allow smoking, sparks, heat

or ame in the presence of fuel or fuel vapors.

• Prolonged exposure to the engine exhaust can be harmful. Avoid breathing the engine exhaust. Always run your T-Maxx 3.3 outdoors, in a well-ventilated area. Never run the engine indoors.

• Do not operate your T-Maxx 3.3 at night, or anytime your line of sight to the model may be obstructed or impaired in any way.

• Never operate your T-Maxx 3.3 in crowds of people or busy pedestrian areas. T-Maxx 3.3 is very fast and could cause injury to those unaware of its presence. Keep small children at a safe distance away from the operating area.

• Because T-Maxx 3.3 is controlled by radio, it is subject to radio interference from many sources beyond your control. Since radio interference can cause momentary loss of control, always allow a safety margin in all directions around your model to prevent collisions.

• The engine can be loud. If the noise makes you uncomfortable, wear ear protection. Be considerate of your neighbors by not running your model early in the morning or late in the evening.

• Most importantly, use good common sense at all times.

Children (minors) under 16 years of age and inexperienced drivers should not operate the T-Maxx 3.3 without the supervision of a responsible and knowledgeable (experienced) adult.

Traxxas 1100 Klein Road Plano, Texas 75074 Phone: 972-265-8000 Toll-free 1-888-TRAXXAS

E-mail: support@Traxxas.com

Traxxas U.K. P.O. Box 1128 Winterbourne, Bristol BS36-2SH England Phone: 44-117-956-1002

Internet: www.Traxxas.com

Entire contents ©2008 Traxxas. Traxxas, Maxx, T-Maxx 3.3, TRX 3.3 Racing Engine, TQ-3, Top Fuel, EZ-Start, Ready-To-Race, Ready-To-Win, and ProGraphix are trademarks or registered trademarks of Traxxas. Other brand names and marks are the property of their respective holders and are used only for purposes of identication. No part of this manual may be reproduced or distributed in print or electronic media without the express written permission of Traxxas.

T-MAXX 3.3 OWNERS MANUAL

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Page 4

TOOLS, SUPPLIES, AND REQUIRED EQUIPMENT

T-Maxx 3.3 comes with a set of specialty metric tools. You’ll need to purchase other items, available from your hobby dealer, to operate and maintain your model.

SUPPLIED TOOLS AND EQUIPMENT

“L” wrench set:

1.5mm, 2.0mm, 2.5mm

Antenna nut wrench

Pre-load spacers and shock pistons

(on parts tree) see page 23

REQUIRED TOOLS AND EQUIPMENT

10% quart - #5010 20% quart - #5020 33% quart - #5030 10% gallon - #5060 20% gallon - #5070 33% gallon - #5080

Traxxas Top Fuel

™

Fuel dispensing bottle

Traxxas part #5001 shown

Universal (glow plug)

Extra oiled air lter set

(pre-lter and primary lter)

(sold separately)

12 AA alkaline

batteries

wrench

8mm/5mm wrench

Suspension multi-toolBody clips

NiCad or NiMH 7.2V

battery pack

NiCad or NiMH battery charger

Traxxas part #3030X shown

ACCESSORY EQUIPMENT (sold separately)

TRX Power Charger

Traxxas part #3030X

TRX Charger DC car adapter

Traxxas part #3032

T-MAXX 3.3 OWNERS MANUAL

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RX Power Pack battery

After-run oil to protect

the engine from corrosion

Traxxas part #3037

RX wiring harness

Traxxas part #3034

Small (1/8 inch) at-blade

screwdriver for tuning

Air lter oil

Traxxas part #5263

Recommended Equipment

These items are not required for the operation of your model, but are a good idea to include in any R/C toolbox:

• Safety glasses

• Thin, hobby-quality cyanoacrylate instant tire glue (CA glue)

• Hobby knife

• Side cutters and/or needle nose pliers

• Philips screwdriver

• Soldering iron

Page 5

ANATOMY OF YOUR T-MAXX 3.3

Steering Servo

Brake Rod

On/Off Switch

Battery Box

Slipper Clutch

Spur Gear

Hex Hub

Axle Carrier

Pivot Ball

Skid Plate

Differential

Front Bumper

Bulkhead

Shock Tower

Ultra Shock

(Oil Damper)

Suspension Arm

Front

™

Toe Link

(Turnbuckle)

Throttle/Brake Servo

Receiver Box

Antenna Mount

Chassis

Disc Brake

Air Filter

Transmission

Two-Speed Access Plug

Fuel Cap

EZ-Start Motor

Fuel Tank

Driveshaft (Half Shaft)

Fuel Line

Engine Shut-off Clamp

EZ-Start Plug

Tuned Pipe

Pressure Line

TRX 3.3 Racing Engine

see pg. 13 for details

Body Mount Post

Exhaust Header

Bumper Mount

Wheelie Bar

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Page 6

QUICK START: GETTING UP TO SPEED

The following guide is an overview of the procedures for getting your model running. Look for the Quick Start logo on Quick Start entries. The Quick Start Guide is not intended to replace the full operating instructions available in this manual. Please read this entire manual for complete instructions on the proper use and maintenance of your model.

1. Read the safety precautions on page 3 9. Range test the radio system • See page 10

For your own safety, understand where carelessness and misuse could lead to personal injury.

2. Charge the EZ-Start battery pack • See page 17 10. Fill the fuel tank • See page 14

The EZ-Start requires a fully charged 7.2-volt battery pack (sold separately).

3. Install the antenna • See page 9. 11. Connect the EZ-Start to the model • See page 17

Install the antenna mast on the T-Maxx 3.3. Learn the proper way to use the EZ-Start electric starting system.

4. Install batteries • See page 8 12. Start the engine • See page 18

T-Maxx 3.3 requires 12 AA alkaline or rechargeable batteries for the transmitter (8) and receiver (4) (sold separately).

5. Decal and Install the body • See below 13. Break-in your engine • See page 18

You will need to use the body during break in, so it’s best to apply any additional decals before you use the body.

6. Install the EZ-Start battery • See page 17 14. Tune your engine • See page 20

Install and connect a charged 7.2-volt battery pack in the EZ-Start controller.

Follow this procedure to make sure your radio system works properly at a distance and that there is no interference from outside sources.

Use your fuel-dispensing bottle (sold separately) to ll the tank.

Learn to use the correct starting procedure for your TRX 3.3.

Follow the break-in instructions exactly to ensure the best-performing, longest-lasting engine.

Learn how to set the fuel mixture needles for optimum engine performance.

7. Turn on the radio system • See page 9 15. Drive your T-Maxx 3.3 • See page 22

Make a habit of turning the transmitter on rst, and off last. Learn to use the two-speed functions on your truck,

along with important driving precautions.

8. Check servo operation • See page 10 16. Maintaining your Truck • See page 27

Make sure the throttle and steering servos are working correctly.

Follow these critical steps to maintain the performance of your T-Maxx 3.3 and keep it in excellent running condition.

GLUING TIRES AND DECORATING YOUR T-MAXX 3.3

Tire Gluing

The factory tires on your T-Maxx 3.3 are already glued to the rims. The tires must be glued to the rims to prevent the rims from spinning inside the tires. The instructions here are provided to show you how to glue replacement tires to the rims in the future. Use CA tire glue available from your local hobby dealer. You can glue the tires without removing the wheels from the truck. For clarity, these instructions show the process with the wheels removed.

1. Remove a wheel from T-Maxx 3.3 using the larger (8mm) end of the universal (glow plug) wrench.

2. Use your thumb to push the side of the tire away from the rim. Place one or two drops of CA glue into the opening and release the tire. Capillary action will draw the glue around the bead of the tire.

3. Repeat step two at four or five points around the rim, until the tire is completely secured to the rim. Turn the rim over and repeat the process for the inside of the rim/tire. Repeat for the other three wheels.

4. Reinstall the wheels, make sure none of the axle pins have fallen out from behind the hex hubs.

Applying the Decals

The main decals

have already been applied to your T-Maxx 3.3. The extra decals provided are die-cut for easy removal. Use a hobby knife to lift the corner of a decal and remove it from the backing.

Carefully position the decal over the desired location and press one side on the body. Pull the decal tight and use a finger to gradually smooth out any air bubbles as you apply the decal.

Look at the photos on the box for typical decal placement.

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Page 7

THE TRAXXAS TQ-3 RADIO SYSTEM

CH.3

CH.2

CH.1

Channel

Frequency

Band

Flag

Color

Traxxas Part No.

1 26.995 Brown 2031

2 27.045 Red 2032

3 27.095 Orange 2033

4 27.145 Yellow 2034

5 27.195 Green 2035

6 27.255 Blue 2036

Your T-Maxx 3.3 is equipped with the TQ-3 radio system. The TQ-3 is a 3-channel system that provides up to a quarter mile range and control for up to three servo outputs.

TQ-3 TRANSMITTER

T-MAXX 3.3 WIRING DIAGRAM

4-cell Battery

Holder

Antenna

Throttle Neutral Adjust

Steering Wheel

Throttle Trim

Steering Trim

Throttle Trigger

Servo Reversing

Switch

Power Switch Power Indicator

Battery Compartment

RADIO SYSTEM TERMINOLOGY

Please take a moment to familiarize yourself with these radio-system terms. They will be used throughout this manual.

5-Cell Pack - Another term for RX Pack or rechargeable receiver pack. An RX Pack is made up of ve rechargeable NiMH battery cells and is used in place of the 4AA batteries in a model.

Channel - The 27 MHz frequency band is divided into 6 channels so that up to six models can be operated simultaneously. Each channel is referred to by its ag color and channel number, as shown below.

Clearing your frequency - A routine, verbal check to make sure nobody else in your area is operating on the same channel. Always

On/Off Switch

Antenna

Steering

Servo

Receiver

Battery Channel 1

Throttle/Brake

Servo

Channel 2 Channel 3

Don’t push the transmitter antenna down from the top. Pull it down from the bottom, one segment at a time, to prevent binding and kinking the antenna mast.

clear your frequency by calling out your channel number before operating your model. Wait or move to another area if your channel is already being used.

Crystal (X-tal) - The plug-in device that determines which channel the radio system will operate on. For each channel, there are two crystals, one for the receiver and one for the transmitter. Of those two crystals, the one marked “RX” with the lower number (.455 MHz lower) must be inserted into the receiver.

Frequency band - The radio frequency used by the transmitter to send signals to your T-Maxx 3.3. All Traxxas RTR models operate on a 27 MHz frequency band.

mAh – Abbreviation for milliamp hour. Measure of the capacity of the battery pack. The higher the number, the longer the battery will last between recharges.

Neutral position - The standing position that the servos seek when the transmitter controls are at the neutral setting.

NiCad - Abbreviation for nickel-cadmium. The original rechargeable hobby pack, NiCad batteries have very high current handling, high capacity, and can last up to 1000 charging cycles. Good charging procedures are required to reduce the possibility of developing a “memory” effect and shortened run times.

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Page 8

On/Off Switch

4-cell battery holder

CH.2

CH.1

THE TQ-3 RADIO SYSTEM

NiMH - Abbreviation for nickel-metal hydride. Rechargeable NiMH batteries offer high current handling, and much greater resistance to the “memory” effect. NiMH batteries generally allow higher capacity than NiCad batteries. They can last up to 500 charge cycles. A peak charger designed for NiMH batteries is required for optimal performance.

Receiver - The radio unit inside your T-Maxx 3.3 that receives signals from the transmitter and relays them to the servos.

RX - RX is a common abbreviation for the radio receiver and items associated with it.

Servos - Small motor units in your T-Maxx 3.3 that operate the throttle and steering mechanisms.

Three-channel radio system - The TQ-3 radio system, consisting of the receiver, the transmitter, and the servos. The system uses three channels: one to operate the throttle, one to shift the transmission, and one to operate the steering.

Transmitter - The hand-held radio unit that sends throttle and steering instructions to your T-Maxx 3.3.

Trim - The ne-tuning adjustment of the neutral position of the servos, made by turning the throttle and steering trim knobs on the face of the transmitter.

INSTALLING TRANSMITTER BATTERIES

Your TQ transmitter uses 8 AA batteries. The battery compartment is located in the base of the transmitter.

power indicator light does not indicate the charge level of the battery pack installed in the model. If the power indicator doesn’t light red, check the polarity of the batteries. Check rechargeable batteries for a full charge.

INSTALLING RECEIVER BATTERIES

The radio receiver in your model uses 4 AA batteries.

The battery holder for the receiver batteries is located underneath the battery cover. The battery cover can be identied by the on/off switch.

Remove the battery cover by

removing the two 3x10mm buttonhead cap screws from the cover.

Remove the battery holder

and install 4 AA alkaline batteries. Make careful note of the battery polarity by comparing against the diagrams in the battery holder.

Insert the battery holder into the

battery cover.

4. Direct the battery wires through the slot in the

battery cover. If the wires are not properly

routed, they may become broken or shorted, causing radio system failure and loss of control.

5. Reinstall the battery cover and secure with the screws.

To prevent losing control of your model, it is important to stop at the rst sign of weak receiver batteries to avoid losing control. Visible warning signals include sluggish steering response and shortened radio range.

Remove the battery compartment door by pressing the tab and

lifting the door up.

Install the batteries in the correct orientation as indicated in the

battery compartment.

Reinstall the battery door and

snap it closed.

4. Turn on the transmitter and check the power indicator for a solid red light.

If the power indicator light ashes, then the transmitter batteries are weak, discharged or possibly installed incorrectly. Replace with new or freshly charged batteries. The

Use the Right Batteries

Your transmitter uses AA batteries. Use new alkaline batteries, or rechargeable batteries such as NiCad or NiMH (Nickel Metal Hydride) batteries in your transmitter. Make sure rechargeable batteries are fully charged according to the manufacturer’s instructions.

T-MAXX 3.3 OWNERS MANUAL

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If the radio system doesn’t appear to work when the transmitter and receiver switches are turned on, check for correct battery installation.

Traxxas TRX Power System (optional)

The optional Traxxas TRX Power System can be purchased separately to power the radio system in the T-Maxx 3.3. Benets include the economy of a rechargeable 5-cell nickel metal hydride (NiMH) battery pack that replaces AA alkaline batteries, and increased voltage for dramatically improved servo performance. The TRX Power Charger

(Part #3030X) is a peak detecting unit that will charge the RX Power Pack (Part #3036 at pack or #3037 hump pack) in about one hour. The peak detection circuitry automatically shuts off the charger when the maximum charge has been achieved. The TRX Power Charger also includes a

7.2V adapter for charging 7.2V EZ-Start batteries. The TRX Power Charger can operate on either AC or DC power. A special wiring harness for T-Maxx (Traxxas part #3034) that includes a handy external charging jack is required.

The optional DC car adapter (Part #3032) features a tangle-free, extra long wire and integrated fuse. The long charging cord allows the model to remain outside the car while charging. Caution! Never charge batteries in an enclosed car interior or while driving. Never leave charging batteries unattended. Monitor them closely.

Traxxas’ integrated TRX Power System is the easiest way to add the power and economy of rechargeable batteries to your T-Maxx 3.3. Consult your hobby dealer for purchasing information.

If you use rechargeable batteries in your transmitter, be aware that when they begin to lose their charge, they lose power more quickly than regular alkaline batteries.

Caution: Discontinue running your model at the rst sign of weak batteries (ashing red light) to avoid losing control.

Page 9

THE TQ-3 RADIO SYSTEM

CH.3

CH.2

CH.1

Channel 1

Brown

Channel 2

Red

Channel 3

Orange

Channel 4

Yellow

Channel 5

Green

Channel 6

Blue

CH.2

CH.1

SETTING UP THE ANTENNA

1. Locate the black antenna wire that exits the receiver box.

If there are any kinks in the black antenna

wire, it will be more difcult to push through the antenna tube. Pull the wire straight by sandwiching it between your thumb and index nger and running your ngers along the length of the wire (with medium pressure). Insert the end of the wire into one end of the antenna tube (the antenna tube, tip, crimp nut and sleeve are located in the documents bag). Push the wire all the way through the antenna tube.

Spray a little window cleaner on the antenna wire to make it easier to push through the antenna tube.

3. Insert the base of the tube into the antenna

post. Take care not to crimp the antenna wire.

4. Slide the crimp nut over the antenna tube and screw it onto the antenna post. Use the supplied tool to tighten the crimp nut on the post just until the antenna tube is securely in place. Do not over tighten or crush the antenna wire against the chassis.

5. Fold the top of the antenna wire over the top of the antenna tube. Slide the antenna sleeve over the tube to retain the antenna wire. Now slide the antenna tip onto the top of the antenna tube.

6. On the transmitter, always fully extend the telescoping antenna when running your model. Make a habit of holding the transmitter so the antenna points straight up.

Don’t shorten the length of the antenna wire. Its length is tuned to the frequency band; cutting it could severely shorten the radio system’s range.

Antenna

Tip

Antenna

Sleeve

Antenna

Tube

Antenna

Wrench

Antenna

Crimp Nut

Antenna

Post

TQ-3 RADIO SYSTEM ADJUSTMENTS

In addition to the electronic throttle and steering trim controls, your radio system features throttle neutral adjustment and servo reversing switches.

Throttle Neutral Adjustment

The throttle neutral adjustment is located on the transmitter face and controls the forward/reverse travel of the throttle trigger. Change the adjustment by pressing the button and sliding it to the desired position. There are two settings available:

• 50/50: Allows equal travel for

both acceleration and braking.

• 70/30: Allows more throttle travel

(70%) and less brake travel (30%).

50/50 is the required setting for T-Maxx 3.3 with the TRX 3.3 Racing Engine.

Electronic Throttle Trim

The electronic throttle trim located on the face of the transmitter adjusts the neutral (center) point of the throttle servo when the servo is at rest. This control has been preset for you at the factory. If necessary, adjust the

control so that the carburetor is at idle, and the brakes are not applied (the model will roll freely). Do not use the throttle trim to raise or lower the engine idle speed. Make the idle speed adjustment on the carburetor.

Electronic Steering Trim

The electronic steering trim located on the face of the transmitter adjusts the neutral (center) point of the steering servos when the servos are at rest. Adjust this control to make the model drive straight with no steering input at the wheel.

Servo Reversing Switches

The servo reversing switches are located on the front of the transmitter, next to the on/off switch. Moving a switch reverses the direction of the corresponding servo. Each switch corresponds to a channel, as shown below. For example, if you turn the steering wheel to the right and your front wheels turn left, you would move the channel 1 switch to correct the servo direction. It may be necessary to adjust the corresponding trim control after

moving a switch

The default position for the servo reversing switches is shown.

TQ-3 RADIO SYSTEM RULES

• Each time you prepare to run your T-Maxx 3.3, you must clear your frequency to be sure no one else in the area is using the same channel as you.

There are six possible channels, numbered 1 through 6. Each is represented by a color. Look at the crystal plugged into the back of your transmitter to determine which channel your truck is assigned to.

• Always turn your TQ-3 transmitter on first and off last. This procedure will help to prevent your T-Maxx 3.3 from receiving stray signals from another transmitter, or other source, and running out of control.

• Always have the transmitter and receiver turned on before you start the engine. Never turn the radio system off while the engine is running. The on/off switch in the model only turns the receiver on and off. It does not turn off the engine.

• Always use new or freshly charged batteries for the transmitter, and make sure the receiver batteries are fresh. Weak batteries will limit the radio signal between the receiver and the transmitter. Loss of the radio signal can cause you to lose control of your T-Maxx 3.3.

Always turn your

transmitter on rst.

Remember, always turn the TQ-3 transmitter on rst and off last to avoid damage to your T-Maxx 3.3. Never turn the radio off while the engine is running.

Always turn your

receiver on second.

Then start your engine.

T-MAXX 3.3 OWNERS MANUAL

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Page 10

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THE TQ-3 RADIO SYSTEM

TQ-3 RADIO SYSTEM CONTROLS

USING THE TQ-3 RADIO SYSTEM

The TQ-3 Radio System was pre-adjusted at the factory. The adjustment should be checked before running the

model, in case of movement during shipping. Here’s how:

1. Fully extend the chrome antenna mast on the transmitter and turn the switch on. The red indicator light on the transmitter should be solid red (not ashing).

2. Turn on the receiver switch in the model. The switch is located in the side of the radio compartment.

3. Position T-Maxx 3.3 so that its front wheels are off the ground.

4. Turn the steering wheel on the transmitter back and forth and check

for rapid operation of the steering servo. Also, check that the steering mechanism is not loose or binding. If the steering operates slowly, then make sure you have fresh receiver batteries .

5. When looking down at model, the front wheels should be pointing straight ahead. If the wheels are turned slightly to the left or right, slowly adjust the steering trim control on the transmitter until they are pointing straight ahead.

Operate the throttle trigger

on the transmitter and check for rapid operation of the throttle servo. When the throttle trigger is pulled back, the carburetor should open (slide moves

out). When the throttle trigger is pushed all the way forward, the brake should lock.

7. Once adjustments are made, turn off the receiver on your T-Maxx 3.3, followed by the hand-held transmitter.

When the engine is running, don’t use the throttle trim on the transmitter to adjust the engine idle speed. Instead, use the idle speed adjustment on the carburetor.

RANGE-TESTING THE TQ-3 RADIO SYSTEM

Before each running

session with your T-Maxx 3.3, you should range-test your radio system to ensure that it operates properly.

1. Turn on the radio system and

check its operation as described in the previous section (Using the TQ-3 Radio System).

2. Have a friend hold the model

with the engine off.

Make sure your transmitter

antenna is fully extended, and then walk away from the model with the transmitter until you reach the farthest distance you plan to operate the model.

Operate the controls on the transmitter once again to be sure that the

model responds correctly.

Do not attempt to operate the model if there is any problem with the

radio system or any external interference with your radio signal at your location.

T-Maxx 3.3 Servo Operation

T-MAXX 3.3 OWNERS MANUAL

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Page 11

THE TRX 3.3 RACING ENGINE

INTRODUCTION

The TRX® 3.3 Racing Engine is the next generation of TRX nitro power. The larger displacement and advanced porting generate class-leading horsepower while still maintaining the TRX Racing Engine characteristics of broad, linear power delivery and ease of tuning. Focused engineering and rigorous testing have yielded unprecedented power and uncompromising performance that turns ready-to-run into Ready-To-Race®.

The TRX 3.3 Racing Engine takes a total-system approach. Each part of the engine, from the air filter to the exhaust tip, is carefully engineered to work in harmony with other engine components. Each part complements the next, to extract maximum power. The TRX 3.3 Racing Engine is designed to be tolerant of variations in tuning, and to run successfully through a wide range of variable atmospheric conditions such as changes in temperature, humidity, and altitude.

In order to get the longest engine life and keep the TRX 3.3 Racing Engine in top running condition, it is very important to perform regular routine maintenance. The number one cause of premature engine wear

and failure is lack of care and maintenance!

TERMS TO KNOW

You’ll find these Nitro R/C engine terms throughout this section of the manual.

.15 - .15 or “15” refers to the displacement of the engine. The TRX 2.5 Racing

Engine is .15 cubic inches or 2.5 cubic centimeters (cc). The name “TRX

2.5” is derived from the cc measurement.

.20 - .20 or “20” refers to the size of the engine. The TRX 3.3 is .20 cubic

inches or 3.3 cubic centimeters (cc). The name “TRX 3.3” is derived from the cc measurement.

ABC - Abbreviation for aluminum, brass, and chrome. Refers to engine

construction that consists of an aluminum piston that slides in a chromeplated brass sleeve. The TRX 3.3 uses ABC construction.

Air filter - The air filter sits atop the carburetor and prevents harmful dust

and dirt from entering the engine. Dirt ingestion is the number one cause of premature engine failure so the engine should never be run without the air filter in place.

BDC - Bottom dead center. The bottom-most position of the engine

piston stroke.

Break-in - Break-in is the procedure for running a brand new engine

according to specific instructions. This correctly prepares the engine for normal running. The break-in procedure can be different for different makes of engines. Follow the Traxxas directions for break-in exactly.

Carburetor - The carburetor atomizes (mixes) the fuel with the air so that

the engine can burn it. There are two types of carburetors; slide carbs and barrel carbs. The TRX 3.3 uses the superior slide carburetor design.

Carb - Abbreviation for carburetor.

BREAK-IN

The TRX 3.3 Racing Engine is manufactured to exacting tolerances and requires a specially-designed break-in procedure to accomplish the final precision fitting of the internal engine components. It is very important that you follow the new break-in procedure as closely as possible to achieve the best performance and longest life from your TRX 3.3 Racing Engine. Engine break-in will take between one and two hours. Old style break-in procedures, such as idling the engine on the bench for several tanks of fuel or simply running the engine with a very rich fuel mixture for the first 4 tanks of fuel, will not achieve the best results. Follow the easy steps in this manual.

AIR FILTER MAINTENANCE

Dirt is the worst enemy to your engine. A clean air filter is absolutely critical for long engine life. Due to the high performance nature of the TRX 3.3 engine, a tremendous amount of vacuum is created to move a large volume of high velocity air through the carburetor. This model is equipped with a two-stage high performance air filter which requires that the pre-filter stage be cleaned and oiled every hour of operation, and the primary filter be cleaned and oiled every 3-4 hours. An extra pre-lubed air filter set has been provided with this model to encourage you to maintain the engine’s air filter.

AFTER-RUN MAINTENANCE

Perform after-run maintenance on the engine to prevent corrosion from building up on the internal engine components. The fuel naturally attracts moisture and corrosion can build up very quickly inside the engine if it is not prevented.

A few minutes spent before and after each time you run your model will allow you to enjoy it for a long time to come. Read on for more exciting details about your new engine.

Clean-out - Cleaning-out is a condition that occurs when the engine is

accelerating and the fuel mixture becomes sufficiently lean to allow the engine to continue into its upper rpm power band. It is usually characterized by a noticeable decrease in blue exhaust smoke and a dramatic increase in engine speed.

Combustion chamber - The combustion chamber is machined into the

bottom of the cylinder head. This is where the glow plug ignites the fuel. The shape of the combustion chamber is designed to promote more efficient burning of the fuel.

Connecting rod - The connecting rod transfers the piston motion to the

crankshaft. The TRX 3.3 Racing Engine uses a “knife-edged” connecting rod. The aerodynamic, sharpened edges allow it to “slice” through the pressurized air/fuel mixture inside the crankcase.

Crankcase - The engine’s “body” that contains all of the running

mechanical components.

Crankshaft - The main shaft of the engine that holds the

reciprocating assembly.

Cooling fins - The cooling fins are milled into the cylinder head and

crankcase and cause heat to be drawn away from the engine. Heat is removed when it dissipates into the air passing across the cooling fins. It is important to keep the fins clean of dirt and debris for maximum cooling efficiency.

Cylinder head (head) - The finned aluminum part on top of the engine that

is responsible for dissipating most of the engine’s heat. The combustion chamber is machined into the bottom of the head.

Traxxas strongly discourages changing or modifying any part

of the TRX 3.3 Racing Engine. Old tech tips and tricks that may have boosted the power of other engines could seriously diminish the performance of the TRX 3.3 Racing Engine.

There’s more advanced thinking, development and testing in the stock parts of your TRX 3.3 Racing Engine than in many aftermarket manufacturer’s performance parts. The TRX 3.3 Racing Engine is already the most powerful engine in its class and may not benefit from average, low-tech, aftermarket bolt on performance items.

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Page 12

THE TRX 3.3 RACING ENGINE

Dyno - Abbreviation for dynamometer. A precise piece of testing

equipment that accurately measures engine power and torque output over the engine’s entire rpm range.

EZ-Start - Traxxas on-board electric starting system. The system consists of

a hand held starter control unit and an on-board gearbox with an electric motor to spin the engine.

Filter foam - The oiled foam element inside the air filter housing.

Fit - Usually refers to the fit of the piston and sleeve. If the fit is tight,

the piston will feel very tight at top of the sleeve (top dead center), and the engine will have good sealing and compression. If the fit is loose, compression will be low and both the piston and sleeve should be replaced.

Flame-out - Occurs when the engine stops running at high rpm. Usually the

fault of an excessively lean fuel mixture or glow plug failure.

Fuel - (10%, 20%, 33%) The TRX 3.3 must have model engine fuel to run.

Traxxas Top Fuel

™

is recommended. Fuel is sold in quarts and gallons from hobby dealers. The 10%, 20% and 33% labeling refers to the percentage of nitromethane contained in the fuel.

Fuel mixture - The ratio of fuel to air as determined by the needle settings

of the carburetor.

Fuel tubing (fuel line) - The thick silicone tubing that carries fuel from the

fuel tank to the carburetor.

Glow plug - The glow plug is located in the cylinder head at the top of the

combustion chamber. It contains an element that glows red hot when voltage is applied. When the engine is being started, the heat from the glow plug ignites the fuel mixture and starts the combustion process.

Glow plug driver - This tool clips onto the glow plug and supplies the

required voltage to light the glow plug element. It is also called an igniter. EZ-Start equipped engines do not require this separate tool.

Header - The aluminum tube that connects the exhaust system to the

engine exhaust port. The length and diameter of the header must be carefully selected to extract the most power from the engine.

High-speed needle (HSN) - Adjusts the carburetors fuel/air mixture at high

throttle openings.

Idle speed - The speed (rpm) the engine runs at when the transmitter’s

throttle trigger is at neutral.

Idle speed screw (ISS) - Located on the carburetor body. This screw adjusts

the idle rpm of the engine.

Lean - A running condition where the engine is not getting enough fuel (for

the available air). Symptoms include engine overheating, or the engine runs for a short time and then stalls, particularly at high speed. This is a dangerous condition that should be corrected immediately or it can ruin your engine.

Leaning the mixture - Turning either the high-speed and/or low-speed

needle(s) clockwise to decrease the amount of fuel the engine receives.

Low-speed needle (LSN) - Needle valve that controls the fuel mixture at

low throttle openings.

Needle valve - Valve consisting of a tapered needle that closes against a

corresponding seat to regulate fuel flow.

Nitro - Abbreviation for nitromethane, a component of model engine fuel

that improves fuel combustion and power output. Nitro also refers to a class of R/C powered by model engines instead of electric.

Nitro content - The amount of nitromethane used in the fuel. Usually

measured as a percentage of the total fuel volume. Traxxas engines are optimized to use 10-20% nitro. 33% nitro may be used for racing.

Nitromethane - Nitromethane is a component in the fuel that increases

power from the combustion process up to a point. Engines are generally optimized to use a range of nitro content for the best power.

O-ring - Rubber “O”-shaped ring used as a sealing gasket.

Pipe - Abbreviation for the tuned exhaust pipe on a nitro engine. See

“Tuned Pipe”.

Piston - The piston is the internal engine part that is attached to the upper

end of the connecting rod and moves up and down in the cylinder sleeve. The precise fit between the piston and the sleeve creates a seal that allows the engine to have the required compression for combustion.

Port - Ports are openings in the sleeve that allow atomized fuel to enter the

combustion chamber and burned exhaust gases to exit. The shape and location of the ports are a large factor in controlling the engine timing and power output.

Pre-filter - The outer air filter element in a two-stage air filter. This provides

the first level of air filtration for the engine. The majority of dirt and debris will be stopped by this filter. Clean, re-oil, and replace this filter after every hour of run time. Always use both the pre-filter and primary filter.

Primary filter - The inner air filter element in a two-stage air filter. This

provides a second level of air filtration after the pre-filter removes the majority of dirt and debris. Clean, re-oil, and replace this filter after every 3 - 4 hours of run time. Always use both the pre-filter and primary filter.

Priming - Manually causing fuel to move from the fuel tank up to the

carburetor. This is sometimes necessary after the engine has been sitting for a long period of time and all of the fuel has drained back to the tank. On a Traxxas model this is done by holding your finger over the exhaust tip for one or two seconds while the engine is starting.

Punch - A term that refers to how quickly the model responds to throttle

input or how quickly it accelerates.

Rich - A running condition where the engine is getting too much fuel for

the available air. It is better to run an engine slightly rich to increase engine life. Excessively rich mixtures cause the engine to have sluggish performance with exaggerated blue smoke and unburned fuel coming from the exhaust.

rpm - Abbreviation for revolutions per minute (how many times the engine

crankshaft spins in a minute).

Sleeve - Internal engine part that contains the piston. The precise fit

between the sleeve and the piston creates a seal that allows engine to have the required compression for combustion. The sleeve in a TRX engine is made of brass and is then hard-chrome plated.

Slide carburetor - The throttle on a slide carburetor closes and opens by

sliding a barrel in and out of the carburetor body. This type of carburetor is preferred for performance use because it provides a less restrictive “straight-through” air path than the barrel carburetor design.

Stall - When the engine stops running, usually due to an incorrect fuel

mixture setting or running out of fuel.

TDC - Top dead center. The top-most position of the engine

piston stroke.

Tuned pipe - The tuned exhaust pipe usually consists of a specially-shaped

metal or composite chamber with baffles that is designed to enhance the power output of the engine.

Two-stage air filter - An air filter with two separate, oiled foam filter

elements. The outer element, the pre-filter, removes the majority of dirt and debris. The inner element, the primary filter, then filters the air again before it enters the engine. The pre-filter should be cleaned, oiled, and replaced every hour of runtime. The primary filter only requires cleaning and re-oiling every 3 - 4 hours, depending on running conditions.

Wear-in - Fitment process that occurs during engine break-in where

internal engine parts develop an even more precise matched fit through actual use under controlled circumstances.

WOT - Abbreviation for wide-open throttle.

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Page 13

TRX 3.3 RACING ENGINE ILLUSTRATED

THE TRX 3.3 RACING ENGINE

Two-Stage Air Filter

High-Speed Needle

Fuel Intake

Air Intake

Carburetor

Flywheel

Crankshaft

Idle Speed Screw

Clutch Bell

Glow Plug

Head Protector

PowerTune™ Head

(Cylinder Head)

EZ-Start

Drive Unit

EZ-Start

Motor

Low-Speed Needle

Engine Mount

Crankcase

Throttle Arm

Pressure Line

Tuned Pipe

Exhaust

Tip

Glow Plug Wire

Ground Wire

EZ-Start

Plug

Positive Wire Negative Wire

Engine

Shut-off

Clamp

EZ-Start

Controller

Fuel Line

Fuel Tank

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Page 14

THE TRX 3.3 RACING ENGINE

THE FUEL

Use the Right Fuel

It’s imperative that you use the correct fuel in your TRX 3.3 Racing Engine for maximum performance and engine life. Traxxas Top Fuel ensure correct engine lubrication, performance, and ease of tuning. Traxxas Top Fuel has been proven in thousands of engines, so you can count on it every day for great performance.

• Top Fuel is the only fuel which is 100% certified for use in Traxxas engines.

• Traxxas Top Fuel is made with just the right balance of the highest grade natural and synthetic lubricants to allow excellent throttle response and the best top-end performance, without sacrificing longterm durability.

• All of the components in the fuel are carefully selected from the best materials available and then custom blended to match the metallurgy and temperature characteristics of Traxxas engines.

You may use 10%, 20% or 33% nitro-content fuel. Try to use the same percentage all the time, avoid switching back and forth between fuels. We recommend that if you break in your engine on 20% fuel that you stick with that percentage. If you do move to a higher or lower percentage, make sure you readjust your fuel mixture to compensate.

What about Other Fuels?

Can other brands of fuel be used besides Top Fuel? There are other fuels that can provide satisfactory performance; however there could be longterm costs in the form of decreased engine performance, loss of tuning ease, and shorter engine life. Only use fuels that contain both castor and synthetic oil.

Everyone has an opinion or a claim to make about fuel. The engineering team at Traxxas has spent years developing TRX Racing Engines. No one knows more about the specific fuel requirements of Traxxas engines, than Traxxas engineers. We strongly urge you not to take chances with your engine investment and use the Traxxas fuel made for the TRX 3.3 Racing Engine.

Choosing a Nitro Percentage

A commonly asked question is “what is the difference between 10%, 20%, and 33% fuels?” Increasing the nitro in the fuel is almost like adding extra oxygen to the combustion process. It burns more efficiently, improves combustion, and delivers more power. When increased nitro is used, more of the other fuel components are then required inside the combustion chamber to maintain the perfect air/fuel ratio. Therefore, overall fuel mixtures need to be richened slightly (on the high speed needle, about 3/4 of a turn counterclockwise when changing from 20% to 33%, about 1/2 of a turn counterclockwise when changing from 10% to 20%). This allows greater fuel flow through the engine and promotes cooler running, even at the maximum lean settings.

If 33% improves power, then it seems that the highest nitro content available (beyond 33%) should always be used in the engine. In reality, there are practical limitations. Engines are designed to run best within a range of nitro percentages. How the engine is ported, the size of the combustion chamber and other factors determine how much nitro can be efficiently used in the engine. The TRX 3.3 Racing Engine responds exceptionally well to a maximum of 33% nitro, returning cooler temps, more power, and a smoother throttle response. For those who want to run higher nitro, 33% Top Fuel is the optimum nitro percentage for the TRX 3.3 Racing Engine. Increasing the nitro beyond 33% can introduce the need for engine modifications (ports, head shimming, etc.) to avoid starting and tuning difficulties. There are limits to how much nitro an

™

should be used to

engine can effectively use to make more power. Lower nitro percentages have their own advantages. Nitro is an expensive component in the fuel so 10% nitro blend is more economical for the sport user. 10% also provides greater latitude with the needle settings for easier tuning.

When using Traxxas Top Fuel, using higher nitro percentages does not cause the engine to wear out faster. 33% Top Fuel contains the same quality lubrication package as 10 and 20% Top Fuel. Some non-Traxxas high-percentage nitro racing fuels do sacrifice some lubrication in attempts to increase performance. We urge you to not take chances with your engine investment and use Top Fuel for consistent performance and long engine life.

Handling the Fuel

• Follow all directions and warnings on the fuel can.

• Keep the fuel tightly capped at all times. Some components in the fuel can evaporate very quickly and upset the balance of the fuel.

• Do not store unused fuel in the fuel dispenser. Immediately return fresh unused fuel back into the fuel can.

• Do not mix old and new fuel. Never mix different fuel brands together.

• Store the fuel in a cool dry location, away from any source of heat, ignition, or combustion.

• Read and follow the safety precautions on page 3 in this manual.

DANGER! Model engine fuel is poisonous to humans and animals. Drinking the fuel can cause blindness and death. Handle with care and respect. Keep it out of reach of minors at all times! While driving, do not leave your fuel dispensing bottle on the ground where a child could have access to it. Follow fuel label warnings. Fuel is ammable. Only use outdoors. Keep fuel away from all sources of ignition (ame, sparks, heat, etc.).

FILLING THE FUEL TANK

Use a fuel dispensing bottle (Traxxas Top

Fueler, part# 5001) to put fuel into the T-Maxx’s fuel tank. To fill the fuel bottle, squeeze the air out, insert the dispenser tip into the fuel can, and release your grip on the bottle. As the bottle expands, fuel will be drawn into it.

To fill your model flip up the spring-loaded cap on the fuel tank, insert the tip of the fuel bottle, and squeeze to dispense the fuel. Fill the tank until the fuel level reaches the base of the filler neck. Close the fuel tank lid, making sure it closes tightly.

Fuel Tank Seal Adjustment

The rubber seal on the fuel tank is important to the function of the engine. The fuel tank is pressurized by the exhaust system to provide reliable fuel flow. If the tank lid does not seal properly, an air leak will be created that can cause your engine to run erratically and be difficult to start. If necessary, the rubber O-ring tank seal can be adjusted for improved sealing by tightening the screw on the underside of the tank lid.

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Page 15

THE TRX 3.3 RACING ENGINE

THE AIR FILTER

The TRX 3.3 Racing Engine in this model is equipped with a specially designed two-stage air filter to deliver maximum filtering efficiency and performance while protecting your engine from dust and dirt during extended operating conditions. Use only the supplied filter. You will not improve engine performance by switching to an aftermarket filter, and you may risk engine damage due to poor filtration.

The two-stage TRX Racing Filter consists of the following components:

1. A rubber filter Base

2. A 3-piece plastic housing

3. A “pre-filter” element

4. A “primary” filter element

You must clean the outer pre-filter after every hour of run time, even if the filter looks clean. The primary filter element inside must be cleaned after

3-4 hours of run time. These intervals include the break-in time. Clean your air filter after break-in. Dust (which is often too fine to see) and dirt

constantly move through the filter anytime the engine is running. Even if you can’t see dirt on the filter, it is present inside the foam after any amount of run time. If you exceed the recommended cleaning intervals, your engine will be damaged. Engine damage or wear due to dirt ingestion is easy to detect, and one of the top causes of premature engine failure.

Pre-Filter Cleaning Instructions (every hour of run time)

Remove the clip from the air filter

and remove from the metal hanger. Remove the air filter assembly from the carburetor bore by pulling the entire filter assembly firmly to the side to release it. Do not pull straight up.

2. Remove the pre-filter element.

3. Clean the pre-filter element by

thoroughly washing the foam element in hot soapy water (dishwashing detergent works well). Repeat twice.

4. Thoroughly dry the pre-filter element with a clean towel.

5. Oil the foam element with air filter oil. Use Traxxas filter oil (part# 5263)

or a high-quality, special-purpose foam filter oil like what is used for off-road motorcycle and ATV engines. This type of filter oil is available at motorcycle pro-shops. Apply a total of 24 drops of Traxxas air filter oil, evenly distributed between the top, bottom and sides of the filter element. Squeeze the filter element repeatedly to help spread the oil throughout. The filter element should be evenly colored by the oil. Even color indicates that the oil is spread evenly. Do not squeeze out excess oil. Note: Do not use the air filter oil for anything other than the air filter. It is not meant to be a lubricant.

6. Reassemble the filter and install it on the engine, making sure the rubber filter neck fits securely on the carburetor with no gaps or air leaks.

Pull to the side to remove assembly

6. Oil the foam pre-filter with 24 drops of air filter oil, and the primary filter

element with 30 drops of air filter oil.

7. Reassemble the filter and install it on the engine, making sure the rubber filter neck fits securely on the carburetor with no gaps or air leaks.

THE CARBURETOR

Understanding the Carburetor Adjustments

The carburetor performs several functions. It controls the engine’s speed by restricting the intake of air and fuel into the engine. It atomizes the fuel (suspends the fuel droplets in the air) and also controls the air/fuel ratio of the mixture entering the engine (how much air for a given amount of fuel).

To help provide a better understanding of engine tuning and why it’s necessary, the following is a brief explanation of the air/fuel combustion process that takes place inside the engine.

In order to create the cylinder pressure that results in power, the engine burns the air/fuel mixture. Both air and fuel, in correct amounts, are needed for proper combustion. It is the carburetor’s job to mix the air and fuel together (atomize the fuel), in the correct proportion for the best possible combustion. This is the ideal air/fuel ratio. The ideal air/fuel ratio required for the engine remains roughly constant. Due to variations in atmospheric conditions (temperature, humidity, altitude etc.) fuel flow adjustment valves (called fuel mixture needles) are required to meter the fuel and maintain the ideal air/fuel ratio in these ever-changing conditions. For example, colder air is more dense (more air molecules) for a given volume of air and therefore requires more fuel (more fuel molecules) to maintain the correct air/fuel ratio. Warmer air is less dense (fewer air molecules) and therefore needs less fuel to maintain the correct air/fuel ratio. The tuning needles are there to adjust how much fuel is made available for the carburetor to mix with the available air (atomization).

Fuel

Cold Air (More Dense) Warm Air (Less Dense)

Air

Primary Filter Cleaning Instructions (every 3 - 4 hours of run time)

1. Remove the clip from the air filter and remove from the metal hanger. Remove the air filter assembly from the carburetor bore by pulling the entire filter assembly firmly to the side to release it. Do not pull straight up.

2. Remove the pre-filter element.

3. Remove the 3x6mm screw in the end of the filter housing. Remove the

front housing and the primary filter element.

4. Clean the filter parts by thoroughly washing in hot soapy water (dishwashing detergent works well). Repeat twice for the foam filter elements.

5. Thoroughly dry the foam pre-filter and primary filter elements with a clean towel. Dry the remaining filter parts.

Pull to the side to remove assembly

See page 21 for more information on how air density affects engine tuning.

The Fuel Mixture Needles

The amount of fuel metered and atomized by the carburetor is controlled by the two mixture needles, the high-speed needle and the low-speed needle. The low-speed needle is used to meter the fuel used by the engine at idle and low rpm (part-throttle) engine speed. The high-speed needle is used to meter the fuel when the throttle is open from part throttle to wide-open throttle (WOT). Two needles on the TRX 3.3 Racing Engine provide precise control of the air/fuel ratio across the engine’s entire rpm range.

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Page 16

THE TRX 3.3 RACING ENGINE

Water Valve

(Controls Overall Flow)

High Speed Needle

Water Nozzle

(Controls Fine Flow)

Low Speed Needle

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The maximum possible fuel flow is always controlled by the high-speed needle. It works like the main water valve on a garden hose. Turn it clockwise to close the valve, counter-clockwise to open it. When the throttle is at idle or partially open, the low-speed needle meters the fuel flow at the outlet (needle seat) where the fuel enters the carburetor venturi. This second valve acts like the spray nozzle at the end of the garden hose in our example. When you accelerate from idle, the throttle opens and the low-speed needle is pulled away from the needle seat. This allows more fuel to flow with the increased air flow. As the throttle is increased, the low-speed needle is pulled completely away from the needle seat leaving it fully open. At that point, fuel metering is entirely controlled by the high-speed needle. Again, using our water hose example, when the spray nozzle at the end of our garden hose is fully open, then the main water valve can be used to adjust how fast the water flows.

The engine’s performance is directly linked to the fuel mixture. Richening the fuel mixture increases the amount of fuel in the air/fuel mixture ratio and leaning the fuel mixture decreases the amount of fuel in the air/fuel mixture ratio.

Lean

Rich

A “turn” refers to tightening (“turning in”) or loosening (“turning out”) mixture needles. A “full turn” refers to turning the needle 360°, so a “1/2 turn” would be 180°, a “1/4 turn” would be 90°, and so on.

General fuel mixture settings are measured by the number of turns the needles are turned out from fully closed. The fuel mixture settings have been pre-set from the factory to typical break-in settings. Do not readjust your carburetor from the factory settings until after the engine is started and running, and you have been able to observe the engine running to assess what minor adjustments may be required to compensate for fuel, temperature, and altitude. Adjustments are usually made in 1/8 or 1/16-turn increments. If the engine sticks at TDC, see page 29 for instructions on freeing the engine.

The Idle Speed Screw

The idle speed screw controls the closed position of the throttle slide. When the throttle servo is in its neutral position, the throttle slide should be stopped against the idle adjustment screw. Always use the idle speed adjusting screw to control engine idle. Do not use the throttle trim on the transmitter to adjust idle speed. The idle speed should be set as low as possible and still maintain reliable running.

See Tuning Your TRX 3.3 Racing Engine on page 20 for complete information on adjusting the air/fuel mixture and idle speed.

Factory Needle Settings

If your factory preset carburetor adjustments have been tampered with, use the following settings:

Fig. A

• Set the high-speed needle to 4 turns out from closed.

• Set the low-speed needle so the screw head (red in Fig. A) is flush (even) with the end of the slide (yellow in Fig. A).

Low Speed

Needle Adjustment

Always use the factory settings for initial starting. Only use these settings when the factory settings have been lost.

• Slightly lean fuel mixtures deliver stronger, more efficient combustion and more power, but with less lubrication.

• Slightly rich fuel mixtures deliver cooler running and more lubrication but with slightly less power.

Tuning the engine means finding the perfect balance between the two; excellent power to meet your needs while maintaining good lubrication for long engine life. The optimal fuel mixture setting is rich to provide a safety margin against having a lean condition if some variable changes (such as the temperature from one day to the next).

Higher nitro requires a richer fuel mixture. When running 33% fuel, richen your high speed needle 3/4 turn if previously running 20% nitro and then re-tune the engine for maximum performance.

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Page 17

THE TRAXXAS EZ-START® ELECTRIC STARTING SYSTEM

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

Motor

Glow

Plug

The Traxxas EZ-Start brings the convenience of push-button electric engine starting to your T-Maxx. The EZ-Start consists of a hand-held control unit and an on-board motorized starter.

• Power for the EZ-Start system comes from a 7.2-volt rechargeable battery pack installed in the hand-held control unit (battery sold separately).

• The engine

glow plug is heated automatically by the EZ-Start system,

eliminating the need to keep up with a separate glow plug igniter.

• The voltage to the glow plug is kept constant, regardless of the load placed on the starter by the starter motor.

• The “Glow Plug” LED (light emitting diode) on the control unit indicates the condition of the glow plug.

• The “Motor” LED indicates the status of the EZ-Start electric starter motor.

• The cush drive mechanism in the drive unit prevents damage to the gears caused by engine kickback.

• Smart Start™ protection circuitry prevents damage to the motor by cutting power if the load on the motor or other electronics exceeds safe limits.

Installing the EZ-Start Battery

The EZ-Start system requires

a fully charged 7.2-volt rechargeable NiCad or NiMH battery pack (not included). Use a charger (not included) designed for

7.2-volt battery packs. Charge the

battery according to the charger manufacturer’s directions.

Press the tab in the end of the

battery compartment door to

open (A).

Plug a fully charged 7.2-volt

battery pack into the connector inside (B).

Twist the battery two or three times to twirl the battery plug wires.

This helps hold the wire and battery in place when the battery is installed in the compartment (C).

Install the battery into the compartment and press the wires securely

into place.

Snap the battery compartment door back on and lock the end tab (D).

Using the EZ-Start

Your EZ-Start controller plugs into a 4-prong receptacle in the

center of the bed on your T-Maxx 3.3. When the red button on the controller is pressed, the EZ-Start motor begins to spin the engine and power from the control unit heats the glow plug. Assuming all settings and preparations are correct, the engine should start almost immediately.

Each of the two status indicator LEDs on the hand-held control unit, the Motor LED and the Glow Plug LED, should light green while starting. If either LED fails to light while starting, there is a fault indicated with that function.

If the Glow Plug LED fails to light, the glow plug may be bad, or the glow plug wire may be damaged or disconnected.

It’s normal for your EZ-Start controller to become warm after repeated use.

Protection Mode

The EZ-Start uses Smart Start the system and detect failures. The controller monitors the load being placed on the EZ-Start motor. If the load becomes excessive, the system shuts off power to the motor to prevent costly damage to the motor and the controller. This may occur, for example, if the engine floods with fuel during starting. The starter spins at first but when excessive fuel in the combustion chamber begins to lock up the engine, the starter motor slows under the heavier load. This causes the protection circuit to shut off the power to the motor. Allow at least 3 minutes for the starter motor to cool and the circuit to automatically reset before continuing. Use the time to find and eliminate the condition that caused the excessive load on the starter motor.

When the EZ-Start controller is in protection mode, wait at least three minutes before attempting to start the engine, to give the starter motor time to cool.

Use a Strong Starter Battery

A weak starter battery, or one that has not been fully charged, may not deliver enough power to crank the engine over at the appropriate rpm to keep the piston from sticking at top dead center (TDC). A new engine will typically have a tight fit between the piston and the top of the sleeve. This is a tapered fit, and a tight piston sleeve fit on initial startup is desirable for those who want the best-performing engine. Make sure you are using a good quality battery pack that is fully charged (new batteries usually require several charge cycles to reach peak voltage and full capacity). This is especially important with a new engine that needs to be broken in. If the engine sticks at TDC, see page 29 for instructions on freeing the engine.

Shutting Off The Engine

Turning off the switch for the radio will not shut off the engine. To shut off the engine, use the shut-off clamp on the fuel line. Squeeze the clamp closed to shut off the fuel supply to the engine. Don’t forget to release it when you restart the engine.

Avoid shutting off the engine by placing your finger over the exhaust outlet, especially if you are through driving for the day. This will leave more unburned fuel in the engine that could lead to harmful corrosion.

Always be careful not to touch the exhaust pipe after running, it can become very hot.

THE TRX 3.3 RACING ENGINE

If the Motor LED fails to light and the starter fails to operate, then the EZ-Start is in protection mode.

™

technology to monitor the condition of

Use the Right Charger

The most convenient type of charger is an AC peak-detecting charger that plugs directly into an AC wall outlet, such as the TRX Power Charger (see page 8 for more info). It contains special peak-detection circuitry that automatically shuts the charger off when the battery is fully charged.

If you’re using a 15-minute timed charger, always fully discharge the battery pack before each charge. Some high mAh battery packs (1500

mAh or higher) require more than the standard 15 minutes of charge time. If the battery pack is cold after 15 minutes of charging, add another 5 minutes of charge time. Closely monitor the battery pack and stop charging it when it begins to feel warm to the touch. Never leave a battery charging unattended. Always follow charger manufacturer’s instructions.

Inexpensive overnight wall chargers may also be used

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Page 18

THE TRX 3.3 RACING ENGINE

BREAKING IN YOUR TRX 3.3 RACING ENGINE

The TRX 3.3 Racing Engine uses a ringless, aluminum-

brass-chrome (ABC) piston/sleeve construction. This type of engine design relies on a very precise running fit between the piston and sleeve for cylinder sealing. Engine break-in is necessary to

allow the piston and sleeve to develop an extremely precise fit and optimum cylinder sealing. Therefore, proper engine break-in is critical to achieving the fastest, most reliable engine performance.

Allow yourself about 1 to 1 engine break-in period will take 5 tanks of fuel in a T-Maxx 3.3. The break-in time is not the time to impress your friends with your new T-Maxx 3.3. You

must wait until the engine is fully broken in before attempting sustained high speed running. Patience and careful attention during break-in will

reward you with the best-performing TRX 3.3 Racing Engine possible.

During break-in, your engine may appear to malfunction with symptoms like stalling, inconsistent performance, and fouled glow plugs. These are simply the normal “break-in pains” engines sometimes go through. They will disappear once your engine is fully broken in. Many owners report not experiencing any of these symptoms with TRX Racing Engines. We

recommend to go ahead and replace the glow plug with a new one after the engine break in procedure.

Engine Break-in Procedure

The focus during break-in is to vary and limit the engine speed. This will be accomplished by accelerating and stopping at different rates for the first 5 tanks of fuel. As the engine begins to break-in, the duration and intensity of the acceleration will gradually increase. Sustained high-speed running is not permitted until the 6th tank of fuel. Perform the initial break-in on a large, flat, paved surface. T-Maxx 3.3 is very fast and by tanks 4 and 5 you

will need plenty of room for the truck to run in. Apply all throttle and braking actions gently. Abrupt acceleration or braking could cause the engine to stall unnecessarily.

• Special break-in fuels are not recommended. Use the same fuel you plan

to use everyday.

• If possible, avoid breaking-in the engine on extremely hot or cold days

(see page 19).

• Pay careful attention to the fuel level. Do not allow the fuel tank to run

completely empty. An extremely low fuel level causes the mixture to run too lean. This could result in a burned glow plug or extremely high engine temperatures.

• Do not attempt to break in the TRX 3.3 Racing Engine by idling it on a

stand. This will produce poor results.

• Keep extra Traxxas glow plugs handy. The break-in process can cause

deposits to form on the plug leading to plug failure.

• Change or clean your air filter after break-in.

• Follow the instructions exactly for each of the first 5 tanks of fuel.

• Never run your T-Maxx 3.3 indoors. Since the TRX 3.3 Racing Engine

exhaust fumes are harmful, always run your model outdoors, in a wellventilated area.

See Important Points to Remember on page 3 for other precautions.

Starting Your TRX 3.3 Racing Engine for the First Time

Before you start your TRX 3.3 Racing Engine for the first time, make sure you have read all instructions and precautions in this manual. Pay close

attention to the tank-by-tank break-in instructions in the next section, and make sure you have read and understood them before you run your engine.

Your TRX 3.3 Racing Engine doesn’t usually require priming. If you do need to prime your engine, watch the fuel line carefully to avoid ooding your engine. See page 29 for information on clearing a

ooded engine

/2 hours to complete the break-in procedure. The

Your engine must be at room temperature (70°F or 21° C) or above the first time you start it. If it’s cooler than room temperature outside, remove

all fuel and keep your T-Maxx 3.3 indoors until you’re ready to start it and then take it outside. If it’s colder than 45 degrees, special considerations should be made. See cold weather break-in on page 19. We do not recommend running the model in temperatures below 35 degrees.

1. Turn on the radio system (see page 9).

2. Make sure the throttle trigger on the

transmitter is in the idle (neutral) position.

3. Connect the EZ-Start controller according to the instructions on page 17.

4. Press the starter button in short two second bursts and watch for fuel moving through the fuel line up to the carburetor. Watch closely! The fuel moves very fast. If the fuel doesn’t move through the line within 5 seconds, prime the engine by briefly (one or two seconds) covering the exhaust outlet with your finger until the fuel is just visible in the carburetor fuel line. Watch carefully! If the

engine is primed too long, it will flood with fuel and stop turning.

5. Once fuel reaches the carburetor, the engine should

quickly start and idle.

6. Disconnect the EZ-Start controller from the model.

7. Proceed with the engine break-in.

8. Do not rev your engine with no load (wheels off the ground).

If your engine doesn’t start, refer to the troubleshooting tips beginning on page 28 or go online to www.traxxas.com/support. If your factory fuel mixture settings have been altered, refer to page 16. If you still have problems, contact Traxxas Customer Support at 1-888-TRAXXAS or support@traxxas.com.

As you gain experience in the hobby, you may discover that many people have differing opinions on what is the proper procedure to break-in a model engine. Only use the Traxxas break-in procedure.

Other break-in procedures could result in a weak, damaged, or otherwise poor performing engine. The procedure outlined here was

extensively tested and proven to yield better performing engines than other “common” break-in methods. Even if you have years of experience using model engines, please do not ignore this caution!

Break-in Checklist

Note: The wheelie bar is installed in the “down” position to help keep the front of the T-Maxx 3.3 down during acceleration. Apply throttle gradually to prevent wheelies during break-in. See page 26 for wheelie bar adjustment.

Tank 1

Drive the model with the body off.

1. Driving procedure: Gently pull the throttle trigger to 1/4 throttle

over a 2-second count. Then gently apply the brake to stop. Count

the two seconds out while accelerating: one thousand one, one thousand two, and then stop. Operate the throttle trigger as smoothly as you can. Repeat this starting and stopping procedure until the

first tank of fuel is nearly empty.

Look for thick blue smoke exiting the exhaust outlet. If there is

no smoke, richen the high-speed needle 1/4 turn, by turning the needle counterclockwise.

4. When the fuel tank is nearly empty, shut off the engine by pinching

the fuel line connected to the carburetor (use the installed clamp).

Let the engine cool for 15 minutes.

Note: If at any point the engine cuts out or stalls during gentle

acceleration, richen the high-speed needle 1/4 turn by turning the needle counterclockwise.

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Page 19

THE TRX 3.3 RACING ENGINE

TANK THROTTLE TIME COOL BODY NOTES

1 1/4 2 seconds 15 minutes Off Apply throttle gradually.

2 1/2 2 seconds 15 minutes On Apply throttle gradually.

3 1/2 3 seconds - On Reduce idle speed if necessary.

4 Full 3 seconds - On Do not allow shifting to high gear.

5 Full 5 seconds - On Accelerate over 3 second count, hold for 2 seconds.

Tank 2

1. From tank 2 forward, T-Maxx 3.3 should be driven with the body on.

2. Driving procedure: Gently pull the throttle trigger to 1/2 throttle over a 2-second count. Then gently apply the brake to stop. Count

the two seconds out while accelerating: one thousand one, one thousand two, and then stop. Repeat this starting and stopping

procedure until the second tank of fuel is nearly empty.

3. When the fuel tank is nearly empty, shut off the engine and let it cool

for 15 minutes.

Tank 3

Driving procedure: Gently pull the throttle trigger to 1/2 throttle

1. over a 3-second count. Then gently apply the brake to stop. Count

the three seconds out while accelerating: one thousand one, one thousand two, one thousand three, and then stop. Repeat this

starting and stopping procedure until the third tank of fuel is nearly empty.

2. As the engine loosens, the idle speed may increase and cause

the model to try to creep forward when stopped. Reduce the idle speed by turning the idle adjustment (see page 13) on the carburetor counterclockwise.

3. When the fuel tank is nearly empty, shut off the engine and refuel. From here on, you do not need to let the engine cool between tanks.

Tank 4

1. Driving procedure: Gently pull the throttle trigger to full throttle over a 3-second count. Then gently apply the brake to stop. Count

the three seconds out while accelerating: one thousand one, one thousand two, one thousand three, and then stop. Repeat this

starting and stopping procedure until the fourth tank of fuel is nearly empty.

Apply the throttle gradually! Your finger should not reach full throttle

until the end of the three-second count. T-Maxx 3.3 may try to shift into second gear. If it does, reduce the throttle input. Do not let T-Maxx 3.3 shift out of first gear.

3. Keep your driving smooth and consistent.

4. When the fuel tank is nearly empty, shut off the engine and refuel.

Tank 5

1. Driving procedure: Gently pull the throttle trigger to full throttle over a 3-second count, hold for 2 more seconds, and then gently apply the brake to stop. Count the five seconds out while accelerating. Repeat this starting and stopping procedure until the fifth tank of fuel is nearly empty.

2. The model should now be shifting into second gear. If it is not, try

turning the high-speed needle clockwise 1/8 turn to lean the fuel mixture slightly and test for shifting.

3. When the fuel tank is nearly empty, shut off the engine and refuel.

Tank 6

STOP! Clean your air filter before you proceed. Refer to the instructions

on page 15. During the sixth tank of fuel, the engine can be tuned for general performance use. Proceed to the next section in this manual (page 20).

High Altitude Operation: If you live in a high altitude region (5000 or more feet above sea level), the lower air density may require you to lean your high-speed fuel mixture slightly from the factory break in settings. Try this if you are experiencing difcult starting or extremely sluggish engine performance at high altitude.

Winter Break-in Tips

During the break-in process, the piston and sleeve wear into each other to form a precise fit. The engine needs to heat up to a temperature around 200 to 215 degrees to allow the piston and sleeve to achieve this fit properly. A precise fit between these two components is critical for proper compression, and optimum performance. If the engine runs too cold during break-in, the piston and sleeve will not expand to their appropriate sizes for break-in, and this can lead to premature wear of these components. This wear may not become apparent until after winter has past, and the engine is operated under warmer running conditions.

• Warm the engine to approximately room temperature by removing all fuel and storing the vehicle inside at room temperature until just before starting the engine. An extremely cold engine can become difficult to start.

• After the engine is running, it is important to keep the temperature of the engine up around 200 to 215 degrees during break-in. In weather below 45 degrees, the TRX 3.3 Racing Engine will tend to run at lower temperatures between 160 to 180 degrees (when tuned at proper break-in mixture settings). This is too cool for break-in. Do not lean the fuel mixture to increase engine temperature! This will also decrease lubrication and cause your piston/sleeve to wear prematurely.

• Wrap the cooling head with a paper towel, clean rag or sock to help keep the engine running around the recommended 200 to 215 breakin temp. If too much heat is contained, the engine can actually run too hot. Make sure that you monitor the engine’s temp closely for the first couple of tanks until you get the right amount of cover for the cooling head. This will, of course, depend on your current weather conditions. Adjusting the cover up and down, exposing more or fewer cooling fins, is a convenient way to regulate engine temps.

• For owners that do not have access to a temperature probe, a drop of water on the cooling head (around the glow plug area) should slowly sizzle for approximately 6 to 8 seconds around 200 to 210 degrees. If the water sizzles for only a few seconds, then it is likely that it is over 220 degrees, and needs to cool down. If the water takes a long time or does not evaporate at all, then the engine is too cool.

• We do not recommend that you operate your engine below 35 degrees Fahrenheit. If you insist on running your vehicle below 35 degrees, be aware that nitro engines may be very difficult to start and tune at extremely cold temperatures. Also, at temperatures below freezing, nitro fuel can actually begin to gel up, and this can be harmful to the engine.

Follow the remaining break-in procedures as outlined in this Owners Manual. This, along with the steps listed above, will ensure a good breakin for your new nitro engine, and provide many hours of enjoyment.

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Page 20

THE TRX 3.3 RACING ENGINE

TUNING YOUR TRX 3.3 RACING ENGINE

The engine’s performance depends on the fuel mixture.

Turn the mixture needles clockwise to lean the fuel mixture and counterclockwise to richen it. Leaning the fuel mixture will increase engine power up to the engine’s mechanical limits. Never run

the engine too lean (not enough fuel flow). Never lean the engine until it begins to cut-out or stall. Leaning the engine beyond the safe

allowable limits will result in poor performance and almost certain engine damage. Indications of an overly lean mixture include:

• Cutting out or sudden loss of power during acceleration.

• Overheating (temperature beyond 270° F at the glow plug).

• Little or no blue smoke coming from the exhaust.

If any of these conditions are present, stop immediately and richen the high speed mixture 1/4 turn. The engine will probably be slightly rich at that setting and you can then retune for performance. Always tune for performance by starting rich and moving leaner toward the ideal setting. Never try to tune from the lean side. There should always be a light stream of blue smoke coming from the exhaust.

Before you begin tuning, the engine should be warmed up to its normal operating temperature and running slightly rich. All final tuning adjustments must be made to the engine at its normal operating temperature. You can tell the engine is running rich by noting any of the following:

• Sluggish acceleration with blue smoke coming from the exhaust.

• T-Maxx 3.3 may not shift into second gear.

• There is unburned fuel spraying from the exhaust tip.

• Leaning the high-speed fuel mixture increases performance.

When tuning for performance, watch closely to notice when there is no longer any increase in speed or power when the high-speed

mixture is lean. If you lean the high-speed mixture to the point that the engine cuts-out, hesitates, or stalls, you are well into the danger zone and engine damage is likely. Richen the high-speed needle 1/4 turn and retune.

For your convenience, the low-speed needle has a positive stop that prevents it from being over tightened and damaging the needle and seat. This also provides an easy way to gauge how many turns out from closed the low-speed needle adjustment is set to.

Low-Speed Fuel Mixture Adjustment

The low-speed mixture is always set after the high-speed needle is correctly adjusted. The low-speed mixture is set using the “pinch test”.

Once the engine is warm, do several high-speed runs to confirm that the high-speed needle is set correctly.

Bring the vehicle in and pinch closed the fuel line going into the

carburetor (use the engine shut-off clamp). The engine should run for 2-3 seconds, speed up, and then shut off.

If the engine runs longer than 3 seconds, then lean the low-speed

needle 1/16 turn, make several more high-speed runs, and retest.

4. If the engine shuts off immediately without speeding up, then richen the low-speed needle 1/8 turn, make several more high-speed runs, and retest.

When the low-speed needle is set correctly, the engine’s throttle response should be very quick, even to the point of making it difficult to keep T-Maxx 3.3 from doing a wheelie when you accelerate!

When adjusting the low speed fuel mixture, it is very important to make several high-speed runs with T-Maxx 3.3 between adjustments to clear out any excess fuel. Perform the pinch test immediately after. If the engine is allowed to idle for a long period of time, it could “load up” with fuel and give you an inaccurate measurement from your pinch test.

High-Speed Fuel Mixture Adjustment

With the engine warm and running at a rich setting, gradually lean the high-speed fuel mixture in 1/16 turn increments. Make several high-speed passes after each adjustment to clear out the engine and note any change in performance. The TRX 3.3 is extremely powerful. Remember to apply the throttle gradually to prevent wheelies or loss of control. Continue this procedure until there is no longer any performance

improvement. If any one of the following conditions occurs, the fuel mixture is already past the maximum safe lean setting:

There is no longer any performance improvement.

The engine begins to cut out at high speed (Danger!).

There is a sudden loss of power during acceleration (Danger!).

The engine begins to overheat. Symptoms of overheating include:

• Steam or smoke coming from the engine (not exhaust).

• Hesitation or stalling during acceleration.

• Popping or clattering sound when decelerating (detonation).

• Fluctuating idle speed.

• Temperature measurement above 270° F at the glow plug (A temperature reading above 270° alone does not necessarily indicate overheating. Look for other symptoms of overheating combined with temperature for a more accurate warning).

Richen the fuel mixture to the optimum setting by richening the highspeed needle at least 1/8 turn counterclockwise and retest. This setting will extend engine component life.

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Page 21

THE TRX 3.3 RACING ENGINE

Idle Speed Adjustment

Once the high and low-speed mixtures have been set, reduce the idle speed to the minimum reliable idle speed. Remember, this adjustment should be made while the engine is running at normal operating temperature.

Turn the throttle trim on the transmitter so the brakes are

applied (note its original position). This ensures that the throttle slide is resting against the idle adjustment screw.

2. Turn the screw counterclockwise to reduce the idle speed, or clockwise to increase it. The idle speed should be set as low as possible while still maintaining reliable running characteristics.

3. Reset the throttle trim on the transmitter to its original position.

Fuel Mixture Adjustment Chart

If the... is..

Humidity Lower

Higher

Pressure (barometer)

Lower Less dense Leaner

density is...

Slightly more dense

Slightly less dense

Higher More dense Richer

then the air

Temperature

Lower More dense Richer

Higher Less dense Leaner

Altitude

Lower More dense Richer

Higher Less dense Leaner

Nitro %

Lower - Leaner

Higher - Richer

Higher nitro requires a richer fuel mixture. When running 33% fuel, richen your high speed needle 3/4 turn if previously running 20% nitro and then re-tune the engine for maximum performance. See

page 14 for more information

Fine-Tuning the Carburetor

After fine-tuning your TRX 3.3 Racing Engine at the end of the break-in procedure, no major adjustments to the fuel mixture are usually necessary. Make note of the temperature, humidity, and barometric pressure at the time you finished fine tuning your carburetor. Current weather conditions can be found online from national websites, local TV news websites, and television. This information will be considered your baseline setting.

You may need to adjust your carburetor needles to compensate for changes in temperature and barometric pressure (air density) from day to day. Generally, you’ll need to richen the fuel mixture when the weather is colder than your baseline temperature and the air density is higher. Lean the fuel mixture when weather is warmer than your baseline temperature and the air density is lower. The chart below provides general guidelines on how weather conditions affect air density when they move higher or lower than your baseline setting (see page 15 for detailed info on how air

density affects mixture settings).

adjust (correct) the fuel mixture to be...

Slightly richer

Slightly leaner

Tuning the Engine by Temperature

The following procedures require an optional infrared temperature probe or on-board temperature gauge (Traxxas on-board digital temperature gauge, part #4091). Engine temperature can be used as an effective tuning aid when you understand the

relationship between engine temperature and ambient temperature. The engine operating temperature, when tuned for maximum performance, will vary according to atmospheric conditions, engine load, gauge accuracy, and many other factors. The atmospheric condition that has the most influence on engine temperature is air temperature. Expect the engine temperature to vary almost in direct proportion to air temperature. Assuming you tuned the engine for the same maximum performance each day, the engine will run about twenty degrees hotter when it’s ninety degrees outside than it would in seventy-degree weather. For this reason, we cannot give you a definitive temperature range that indicates the best possible engine tuning.

There is NO optimal temperature that can be used as a target to deliver the best engine tuning. Do not rely on a temp gauge alone to tune your engine. Tune the engine by paying very close attention to how it responds to changes in fuel mixture (more smoke/less smoke, fast/sluggish, reliable/stalling, smooth sound/ muffled sound, etc). Once the engine is tuned, then observe the temperature.

The temperature gauge can aid you in tuning by giving you a relative indication of how your adjustments are affecting the engine and to help prevent you from reaching excessive engine temperatures. For example, as you lean the fuel mixture, the engine performance will increase along with the temperature. If you continue to lean the fuel mixture and the temperature increases but the engine performance does not change, then you have exceeded the maximum safe lean setting. Make note of the engine temperature. Generally, try to keep your engine from exceeding 270°F when measured at the glow plug. If necessary, increase airflow to the engine by cutting out the rear of the body, windshield, and front valance. In some situations, the engine may perform very well with no stalling, lagging, or hesitation at temperatures above 270°F, particularly in very hot climates. If richening the fuel mixture to bring the temperature down to 270°F results in poor, sluggish performance (engine never cleans out) then return the engine back to a satisfactory state of tune based on how it sounds and performs (always with a visible stream of blue smoke coming from the exhaust) . If engine temperature is exceeding 270°F with proper cooling and no signs of abnormal running, then avoid running the engine at its maximum lean setting. Watch closely for any signs of overheating. Richen the fuel mixture slightly to provide a safety margin of additional cooling lubrication.

Symptoms of overheating include:

• Steam or smoke coming from the engine (not exhaust).

• Hesitation or stalling during acceleration.

• Popping or clattering sound when decelerating (detonation).

• Fluctuating idle speed.

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Page 22

DRIVING YOUR T-MAXX 3.3

Your TRX 3.3 Racing Engine is broken in, the fuel mixture

is balanced, and the idle is set…now it’s time to have some fun! This section contains instructions on making adjustments to your T-Maxx 3.3. Before you go on, here are some important precautions to keep in mind.

• Don’t run your T-Maxx 3.3 in water, mud, snow, or wet grass. It’s

tempting, but water and mud are easily drawn through the air filter and will severely damage the engine. Small amounts of moisture can cause electronics to fail and loss of control over your T-Maxx 3.3. Snow is frozen water. Do not drive the T-Maxx 3.3 in snow or the electronics could be damaged by water.

• The TRX 3.3 Racing Engine is extremely powerful. Remember to apply

the throttle gradually to prevent loss of control. T-Maxx 3.3 is very fast and responsive and is intended for experienced drivers. Do not drive over the limits of your reflexes and ability. Drive with caution at all times and gradually build up your ability to maintain control at T-Maxx 3.3’s upper performance limits.

• Don’t hold T-Maxx 3.3 off the ground and rev the engine excessively

with no load on the engine. This practice could result in internal engine damage. Avoid over revving the engine when T-Maxx 3.3 is airborne after a jump.

• Avoid excessive high-speed running for extended periods of time or

over long distances. This could cause the engine to build up enough speed to exceed maximum safe rpm limits.

• Don’t drive your T-Maxx 3.3 with drive train damage of any kind. The

engine could be damaged due to overloads caused by drivetrain friction, or over-revving caused by loose or missing parts.

• If your T-Maxx 3.3 gets stuck, stop driving immediately. Move the

vehicle and then continue driving.

• Don’t tow anything with your T-Maxx 3.3. The engine is cooled by airflow created by speed. Towing creates a high load on the engine, and at the same time limits cooling of the engine due to low vehicle speed.

• Never turn off the radio system while the engine is running. The truck could run out of control.

Driving Tips

• Monster trucks by design have a high center of gravity that requires a different driving technique. To prevent roll overs, slow down as you approach turns and then apply moderate throttle through the turns. This technique will help T-Maxx 3.3 grab the surface and turn sharper. The center of gravity can be lowered by lowering the ride height. Remove the factory installed spring pre-load spacers to reduce the ride height.

• Do not apply brakes and turn the wheel at the same time. You could tip the truck over.

• When jumping, apply some throttle while T-Maxx 3.3 is in the air to keep the truck’s nose up and land level on all 4 wheels. Be careful not to overrev the engine or land at full throttle. Either could seriously damage your T-Maxx 3.3. If the nose of the truck is too high, then quickly tap the brake to level the truck in the air.

• Drive over large obstacles (such as curbs and rocks) at an angle, instead of head on. This will allow the suspension to articulate and absorb the impact much easier.

• Change or clean the pre-filter element in your air filter after each hour of running. Change or clean the primary filter element every 3 - 4 hours of running. This is critical for the life of your engine. Running time includes the engine break-in period.

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Page 23

TUNING ADJUSTMENTS

Caster adjustment shims (1 Front, 1 Rear)

Caster adjustment shims (2 Front)

Caster adjustment shims (2 Rear)

Ver tical

Ground plane

Ver tical

Ground plane

Ver tical

Ground plane

2.5

1.5

0.5

0102030406070809010

Wheel Force (lb)

Wheel Travel (mm)

Wheel Force vs. Wheel Travel

Lower Mount 1, Upper Mount 0 Lower Mount 2, Upper Mount 0 Lower Mount 1, Upper Mount A Lower Mount 2, Upper Mount A Lower Mount 3, Upper Mount A Lower Mount 4, Upper Mount A Lower Mount 1, Upper Mount B Lower Mount 2, Upper Mount B Lower Mount 3, Upper Mount B Lower Mount 4, Upper Mount B

Less Firm

More Firm

Lower Mount 4

Lower Mount 3

Lower Mount 2

Lower Mount 1

SUSPENSION TUNING

Adjusting the Pivot Ball Caps

The pivot ball caps should be adjusted so that the pivot balls operate freely in the axle carriers with no excess play. Use the provided four-way suspension multi-tool to tighten or loosen the pivot ball cap.

Caster Adjustment

The T-Maxx 3.3 offers the ability to adjust the caster angle of the front suspension. Caster adjustment may be used to influence the understeer/ oversteer handling characteristics of the T-Maxx 3.3. Increasing the caster angle will increase the tendency of the truck to oversteer (less traction on the rear tires, more traction on the front tires), while decreasing the caster angle will cause the truck to have a tendency to understeer (push in the turns). This effect becomes more pronounced at higher steering angles and higher spring rates. Caster is adjusted by repositioning the shims on the pivot point of the upper suspension arms.

The stock caster setting is 7-degrees with one shim at each end of the arm. Reduce the caster angle to 4-degrees by removing the rear shim and inserting it next to the front shim. The caster angle can be increased to 10-degrees by removing the front shim and inserting it next to the rear shim.

Fine Tuning the Shocks

The eight shocks (oil dampers) on your T-Maxx 3.3 have tremendous influence on its handling. Whenever you rebuild your shocks, or make any changes to the pistons, springs or oil, always do it carefully and in sets (front

or rear). Piston head selection depends on the range of oil viscosities that you have available. For example, using a two-hole piston with lightweight oil will give you the same damping as a three-hole piston with heavier oil.

We recommend using two-hole pistons with a range of oil viscosities from 30W to 50W (available from your hobby shop). The thinner viscosity oils (30W or less) flow with less resistance and provide less damping, while thicker oils provide more dampening. Use only 100% pure silicone shock oil to prolong seal life. From the factory, the T-Maxx 3.3 uses 40W oil.

The ride height for the T-Maxx 3.3 can be adjusted by adding or removing the clip-on spring pre-load spacers. Note that changes in ride height will occur when changes in shock angle or spring rates are made. You can compensate for ride height changes by changing the pre-load spacers on the shocks.

Shock Mounting Positions

Big bumps and rough terrain require a softer suspension with the maximum possible suspension travel and ride height. Racing on a prepared track or on-road use requires a lower ride height and firmer, more progressive suspension settings. The more progressive suspension settings help reduce body roll (increased roll stiffness), dive during braking, and squat during acceleration.

Upper shock mounting position (A) should generally be used with lower shock mounting positions 1 and 2. Upper shock mounting position (B) should be generally be used with lower shock mounting positions 3 and 4. The innermost upper shock mounting position (0) can be used

T-MAXX 3.3 OWNERS MANUAL

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Page 24

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TUNING ADJUSTMENTS

for tuning with the inner pair of lower shock mounting positions on the arm (1,2). It is not compatible with lower shock mounting positions 3 and 4. Other combinations may be used to achieve individualized suspension settings.

Upper Shock Mounting Positions

The upper shock mounting positions will have suspension effects opposite from the lower shock mounting positions.

Spring rate (at the wheel), increases as the upper shock mounting position is moved from position (A) to position (B).

Ride height is not affected by changes in the upper shock mounting position.

Use the chart below to see the effect of the various shock mounting positions. The horizontal length of the lines indicates the amount of suspension travel. The angle or slope of the lines indicates the spring rate

(at the wheel

Lower Shock Mounting Positions

In the out-of-the-box configuration, the shocks are installed in position (A) on the shock tower and position (2) on the lower suspension arm. This setting allows for firm suspension and low ride height, increasing the spring force (at the wheel). This setting improves high-speed cornering on smoother terrain by lowering the center of gravity. Body roll, brake dive, and squat are also reduced.

The inner pair of holes on the lower suspension arm should be used to increase the ride height of the T-Maxx 3.3. The more vertical position of the shocks will allow for lower shock progression and the soft,

plush feel that’s characteristic of a Traxxas Maxx Truck.

Spring rate (at the wheel) increases as the lower shock mounting position is moved from position (1) to position (4). This is equivalent to using stiffer springs. Use higher spring rate settings for flatter terrain with smaller and fewer bumps, and lower spring rate settings for bigger bumps.

Ride height decreases as the lower shock mounting position is moved from position (1) to position (4). Each pair of lower shock mounting holes (1,2 and 3,4) has equal ride height. Use lower ride height for high-speed cornering and flat terrain, and when racing on relatively smooth tracks. Increase the

ride height for rougher terrain and tracks.

For easier access to the rear-most shock mounting screw, remove the one end of the rear turnbuckle. In the front, remove the suspension pin from the lower front suspension arm to gain easier access to the lower shock mounting screws.

ALIGNMENT SETTINGS

Adjusting the Toe-in

Your T-Maxx 3.3 comes from the factory with zero degrees of toe-in in the front, and one degree of toe-in in the rear. You can adjust the toe-in on the front and rear of the truck. Set the steering trim on your transmitter to neutral. Next, adjust your steering turnbuckles so that both front wheels are pointing straight ahead and are parallel to each other (0 degrees toe-in).

This will ensure the same amount of steering in both directions. Adjust the rear toe control links so that the rear wheels have 1˚ of toe-in.

Static Camber Adjustment

The wheels can be set to have either positive or negative camber (see illustration below). The camber angle changes as the wheel moves up and down through its range of travel. Static camber is the camber angle at the wheel when the vehicle is set at its normal, stationary ride height.

The suspension pivot balls located in the axle carriers adjust the static camber. The pivot balls are protected by blue dust plugs. To adjust your static camber, insert the supplied 2.5mm hex wrench through the slit in the dust plug and engage the end of the pivot ball (compressing the suspension until the arms are parallel to the ground will allow for easier hex wrench engagement). The upper pivot ball is normally screwed all the way in. Negative camber is achieved by screwing the pivot ball of the lower control arm out. Note: When camber is changed, the toe angle of the wheel has to be reset.

Static Camber Base Factory Settings Front: 1-degree negative

camber each side Rear: 1-degree negative camber each side

Positive Camber Negative Camber

TRANSMISSION TUNING

Adjusting the Slipper Clutch

Your T-Maxx 3.3 is equipped with an adjustable Torque Control slipper clutch. The slipper clutch is integrated into the main spur gear on the transmission (see page 5). The slipper clutch is adjusted using the springloaded locknut on the slipper shaft. Use the supplied 8mm open-end metric wrench. To tighten or loosen the slipper nut, insert the 2.0mm hex wrench into the hole in the end of the slipper shaft. This locks the shaft for adjustments. Turn the adjustment nut clockwise to tighten (less slippage) and counter-clockwise to loosen (more slippage). The slipper clutch has two functions:

1. Limiting the engine’s torque output to the wheels to prevent

wheelspin on low traction surfaces and help to prevent damage to the gears in the transmission during on-throttle landings.

2. Protecting the drivetrain from sudden impact or shock loads (such as

landing from a jump with the engine at full throttle).

From the factory the slipper clutch is set for minimal slippage, just enough to protect the drivetrain from shock loads. On slippery, low traction surfaces such as a hard-packed, dry racetrack you may benefit from loosening the slipper adjustment nut to allow for more clutch

All of the toe links are installed on the truck so that

the left hand thread indicators point to the same direction. This makes it easier to remember which way to turn the wrench to increase or decrease toe link length (the direction is same at all four corners). Note that the groove in the hex indicates the side of the toe link with the lefthand threads.

T-MAXX 3.3 OWNERS MANUAL

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Right Hand (Normal) Threads

Left Hand Threads

Decrease

Length

Increase

Length

Page 25

TUNING ADJUSTMENTS

slippage. This will make the truck easier and more forgiving to drive by helping to reduce the amount of wheel spin. Loosening the slipper adjustment can also improve performance on extreme high traction surfaces by preventing the front end from lifting off of the ground when accelerating. Make slipper adjustments in small 1/8 turn increments.

The maximum tight setting for the slipper is just at the point where there is little or no tire slippage on a high traction surface such as concrete or a prepared racetrack. The slipper should not be tightened to the point that clutch slippage is completely eliminated. Do not overtighten the slipper nut or you could damage the slipper bearings, pressure plates, or other components.

Adjusting the Two-Speed Transmission

T-Maxx 3.3 comes equipped with an adjustable two-speed transmission. When the shift point on the transmission is adjusted correctly, it will maximize acceleration and improve drivability. Use a 2mm hex wrench to adjust the shift point. To make the adjustment, the engine must be off (not running).

1. Remove the rubber access plug from the top of the transmission housing.

2. While looking through the opening, rotate the spur gear to align the cutout (notch) on the internal 2-speed clutch drum with the opening.

3. Hold the spur gear and slowly roll the truck forward until the hex on the black adjustment set screw becomes visible in the opening. Note: the truck will only roll forward (not backwards) when the spur gear is held stationary.

4. Insert the 2.0mm hex wrench through the clutch drum and into the adjustment screw.

5. Turn the adjustment screw 1/8 turn counter clockwise to lower the shift point (shifts sooner). Be careful not to loosen the adjustment screw too much or you

Shift

Sooner

Counter-

Clockwise

may cause the screw and spring to fall out (requiring major disassembly and repair). Turn the adjustment screw clockwise for later shifts.

6. Reinstall the rubber access plug to prevent dirt from entering the transmission. Do not put oil or other lubricants into the transmission through the two-speed adjustment access.

7. Check performance by running a test lap after each adjustment. On a small race track with many tight turns, try setting the shift point later so that the truck only shifts into second gear on the main straightaway. This will prevent an unexpected shift in the middle of a turn. On larger tracks it may be necessary to allow earlier shifts for increased speed.

Changing the Spur Gear

1. Remove the four cap head screws that secure the engine to the engine mount.

2. Remove the button head screw that secures the pipe hanger to the rear body mount.

3. Carefully remove the engine and exhaust system from the spur gear area to allow enough room to remove the spur gear.

4. Remove the three screws on the slipper clutch assembly using a 2.5mm hex wrench. Slide the spur gear off of the slipper shaft. If the spur gear

is too tight on the shaft, gently pry on the back of the gear with a flat screw driver to loosen it.

Repeat the above steps in reverse order to install the new spur gear

Adjusting the Gear Ratio

The gear ratio on T-Maxx 3.3 can be adjusted for different conditions that may require either increased acceleration or increased top speed. Adjusting the gear ratio is accomplished by changing the clutch bell on the engine and/or the spur gear (slipper clutch gear) on the transmission. From the factory, T-Maxx 3.3 is equipped with a 22-tooth clutch bell and a 55-tooth spur gear. This combination will provide a good balance of acceleration and top speed. Optional spur gears and clutch bell gears are listed on your parts list. Refer to the chart below for possible gearing combinations.

Adjusting the Spur Gear/Clutch Bell Gear Mesh

The ideal spur gear/clutch bell gear mesh for T-Maxx 3.3 is 0.1mm. To set the gear mesh, place a strip of standard letter/A4 size copy or printer paper (about 0.1mm thick) between the mating teeth. Loosen the four engine mount screws from the bottom side of the chassis (see image) and slide the engine mount up to push the clutch bell gear against the spur gear so the paper is not too tight to pull out or too loose that it will fall out. Tighten the engine mount screws securely. When the paper is removed, you should feel only the slightest amount of play between the gears (almost none) and there should be no binding or friction.

Adjusting the Two-Speed Ratios

T-Maxx 3.3 is equipped to allow adjustment to the 2-speed by installing optional close and wide-ratio gearsets. This requires transmission removal and disassembly (see www.Traxxas.com for detailed instructions). The close ratio gearsets will reduce top speed slightly but will provide more powerful

With 20T Clutch Bell

2nd gear sets Gear 54 56 58

17T/39T 1st 25.42 26.36 27.30

(Standard)

16T/40T 1st 25.42 26.36 27.30

(Close)

18T/38T 1st 25.42 26.36 27.30

(Wide)

With 22T Clutch Bell (standard)

2nd gear sets Gear 54 56 58

17T/39T 1st 23.11 23.96 24.82

(Standard)

16T/40T 1st 23.11 23.96 24.82

(Close)

18T/38T 1st 23.11 23.96 24.82*

(Wide)

With 24T Clutch Bell

2nd gear sets Gear 54 56 58

17T/39T 1st 21.18 21.97 22.75

(Standard)

16T/40T 1st 21.18 21.97 22.75

(Close)

18T/38T 1st 21.18 21.97 22.75

(Wide)

*stock configuration out of the box

The gear ratio chart above shows the available combinations

with optional spur gears, clutch bells, and two-speed gear sets.

# of Spur Gear Teeth

2nd 17.63 18.28 18.94

2nd 19.21 19.92 20.63

2nd 16.22 16.82 17.42

# of Spur Gear Teeth

2nd 16.03 16.62 17.21

2nd 17.47 18.11 18.76

2nd 14.75 15.29 15.84*

# of Spur Gear Teeth

2nd 14.69 15.24 15.78

2nd 16.01 16.60 17.20

2nd 13.52 14.02 14.52

T-MAXX 3.3 OWNERS MANUAL

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Page 26

TUNING ADJUSTMENTS

acceleration by reducing engine rpm loss when shifting from 1st gear to 2nd gear. The wide ratio gear set is designed for wide open areas and will increase top speed, but reduce acceleration due to greater rpm loss when shifting gears.

BRAKE SETUP & ADJUSTMENT

T-Maxx 3.3 is equipped with a disc brake that rides on the yoke of the transmission’s front output shaft. The brake is preset at the factory and should not require attention. As the brake material wears, future adjustments may be necessary.

Brake Shoulder Screw Adjustment

The two shoulder bolts that are used to secure the brake pads to the transmission housing may need to be adjusted periodically as the brake material wears down. They should be tightened so a 0.50mm (.020”) gap exists between the disc and the brake pad (on the transmission side). Adjust in one of the following ways:

1. Use a .50mm feeler gauge between

the brake pad insert and brake disc.

0.5mm gap

2. Push the outer brake pad firmly

against the inner pad with your finger, sandwiching the brake disc between the brake calipers. Tighten the brake shoulder bolts until they just barely touch the brake pads. Do not over tighten these fasteners or you could damage the brake calipers. Loosen each of the shoulder bolts by 1 turn.

Brake Pad Wear and Replacement

During normal use the brake pads should wear at a relatively slow rate. However, if the brake pads wear down close to the metal pad holders, they should be replaced. Any more wear than this could cause damage to the brake parts and improper operation of the brake system.

WHEELIE BAR SETUP & ADJUSTMENT

Position 4 (no wheelies)

Position 3

The top position on cross bars. Offers the flattest launches with little or no wheelie. This is the factory installed position to reduce wheelies during break-in.

Wheelie Bar Installation

The Maxx Wheelie Bar can be used on any Maxx truck with the stock rear skid plate, rear bumper, and rear bumper mounts. It is also compatible with the Traxxas accessory aluminum rear bumper (Part #4935X). The wheelie bar is intended for use on hard, high-traction surfaces, such as pavement, where controlling wheelies can be difficult. It is easily removed for off-road racing or jumping.

1. Slowly bend the end of the skid plate downward, and then key the skid plate into the slot of the wheelie bar.

2. Slide the wheelie bar down to the bottom of the skid plate, and then snap the clip over the lower bumper tube.

3. Removal is opposite of installation. Snap the wheelie bar off of the bumper, and then slide the wheelie bar off of the skid plate.

Wheelie Bar Setup Instructions

Changing the position of the wheelie bar height setting is easier when the wheelie bar is installed on the

Upper Arms

Position

Cross Bars

truck. Snap the upper arms off of the wheelie position cross bars. Move the upper arms to the desired wheelie position cross bar and then snap them in place.

Each setting can offer different results based on the individual ride height and droop settings for a particular truck. Try to avoid riding on the wheelie bar wheels during normal driving (this can happen in the lowest setting with lower than stock ride heights).

Remove the wheelie bar when the T-Maxx will be jumped or driven in harsh off-road conditions.

T-MAXX 3.3 OWNERS MANUAL

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Position 2

Position 1 (big wheelies)

Bottom position on cross bars. Allows the truck to tip back the furthest during a wheelie for longer, high-speed wheelies.

Page 27

MAINTAINING AND STORING YOUR T-MAXX 3.3

Your T-Maxx 3.3 requires timely maintenance in order to stay in top running condition. Neglecting the maintenance

could allow dirt, deposits, and moisture to build up inside the engine leading to internal engine failure. The following procedures should be

taken very seriously.

After each hour of running:

• Clean and re-oil the pre-filter air filter element. At every 3-4 hours, also clean and re-oil the primary air filter element. The instructions for these maintenance procedures are on page 15. We cannot stress enough the value of cleaning your air filter at the scheduled intervals. The cleanliness and condition of your air filter directly influences the running life span or your engine. Do not skip air filter maintenance!

• Clean the outside of the engine of accumulated dirt, oil, and grime. Accumulated grime will decrease the engine’s ability to cool itself.

• Tighten the wheel nuts (especially on the left side). Use the included universal wrench.

After each running session:

• Perform after-run maintenance on the engine. This clears the engine of destructive moisture and other corrosive deposits. This is extremely

important for the life of the engine. See After-run Procedure, right.

• Inspect the gears for wear, broken teeth, or debris lodged between the teeth.

• Inspect the vehicle for obvious damage or wear. Look for:

1. Loose or missing screws

2. Cracked, bent, or damaged parts

3. Cut or loose wiring

4. Cut or kinked fuel lines

5. Signs of fuel leakage

If the engine is worn or damaged enough to require replacing the piston, sleeve, or connecting rod, consider exchanging your old engine for a brand new engine under the terms of the Traxxas Lifetime Engine Replacement Plan (ERP). It could save you time and effort. Details are in your model’s documentation package.

Other periodic maintenance:

• Piston/sleeve: The life of the piston and sleeve will vary greatly with how the engine was used and maintained. The piston and sleeve should be replaced when they no longer seal effectively (loss of compression). Symptoms include the engine being difficult to start when warm, stalling when warm, and stalling when throttle is suddenly closed to idle. Replace the wrist pin and G-clip whenever the piston and sleeve are replaced.

• Connecting rod: The connecting rod should be replaced when the piston and sleeve are replaced. Also replace the piston wrist pin and G-clip whenever the connecting rod is replaced. As with other internal engine components, connecting rod life depends engine’s usage and the quality and frequency of the engine maintenance. Inspect the connecting rod after 3-gallons of fuel have been used.

• Slipper clutch pads (friction material): Under normal use, the friction material in the slipper clutch should wear very slowly. If the thickness of any one of the slipper clutch pads is 1.8mm or less, the friction disc should be replaced. Measure the pad thickness using calipers or measuring against the diameter of the 1.5 and 2.0mm hex wrenches provided with the model.

After-run Procedure

You must perform after-run maintenance on your TRX 3.3 Racing Engine whenever the model will be stored for longer than a few hours. Taking the time to prepare your engine for storage will reward you with longer engine life, easier starting, and better performance.

When a nitro engine is shut off, some excess unburned fuel remains in the engine. The methanol in model engine fuel is hygroscopic, which means it easily attracts and absorbs moisture. This moisture can cause rust and corrosion on the steel engine parts (crankshaft, bearings, wrist pin and starter shaft) if the fuel is not removed from the engine. There are after run oil products available from your hobby dealer or you can use WD-40

™

a common household lubricant. To ensure your TRX 3.3 Racing Engine is protected from internal corrosion, use the following procedure:

1. Shut off the engine by pinching the fuel line closed. This allows most

of the excess fuel to be consumed by the engine. Be sure the throttle is in the idle position. You may have to pinch the fuel line closed for several seconds before the engine stops.

2. Completely empty the fuel tank. Use your fuel-dispensing bottle to

suck out the old fuel. Do not mix the old fuel with your fresh fuel supply. If you leave fuel in the tank, transporting or handling your T-Maxx 3.3 may cause fuel to run into the engine.

3. With the fuel tank empty and the throttle at the idle position, try to

start the engine. The engine will most likely start and run for a few seconds as it uses up any fuel remaining in the engine and fuel lines.

Once the engine stops, clean the outside of the engine with

compressed air or spray motor cleaner. Once the engine is clean and dry, remove the glow plug power wire, glow plug, and air filter.

5. Open the throttle fully and spray a one-second burst of WD-40 into the

carburetor and into the glow plug hole (Caution! Wear safety glasses to prevent spray from getting into your eyes). If you are using after-run oil, follow the manufacturer’s instructions.

Place a rag or paper towel over the engine to catch any WD-40 or

after-run oil that may come out the carburetor or glow plug hole.

7. Connect the EZ-Start controller to the model and spin the engine for

10 seconds.

Remove the rag or paper towel and repeat steps 5–7 two more times.

9. Clean and re-oil the air filter so it will be ready for use next time. See

page 15 for air filter maintenance instructions.

10. Replace the glow plug, reconnect the glow plug power wire, and

reinstall the air filter.

The TRX 3.3 Racing Engine is designed to be easy to rebuild.

Critical engine components such as the crankcase, crankshaft, and engine bearings are made to extremely high quality standards and should under normal circumstances outlast multiple sets of pistons, sleeves, connecting rods, and wrist pins (reciprocating assemblies).

It could be more economical for you to continue to use your good bearings and crankshafts, and simply replace the reciprocating assembly as needed. Engine assembly is not difcult and replacing the reciprocating assembly does not require any special tools or skills.

T-MAXX 3.3 OWNERS MANUAL

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Page 28

TROUBLESHOOTING YOUR T-MAXX 3.3

The following section addresses some very basic engine and radio questions you may have about your T-Maxx 3.3. Most questions arise from simple user errors or minor adjustments that are easy to correct. If you can’t find a solution for your T-Maxx 3.3 here, then visit our Web site at www.Traxxas. com/support. There you will find a much more extensive and detailed online troubleshooting area. In addition, you may call Traxxas Customer Service at 1-888-TRAXXAS (outside the U.S. call 972-265-8000).

Radio system does not work properly:

If the power light on the transmitter does not come on, check for proper

battery installation and that the batteries are new and/or fully charged. If the power light is blinking, then the transmitter batteries are weak and should be replaced. See page 8 for more details.

If the transmitter light is on but the radio is still not responding, check for

proper installation of the receiver batteries and that the batteries are new and/or fully charged. Check to make sure the on/off switch on the model is in the on position. Finally, if there is still no response check the red and black wires that connect the battery pack to the “batt” terminal on the receiver (you will have to remove the receiver cover). Make sure the wires are not pinched or damaged and that the plug is secure in the receiver. See page 8 for more details.

Short radio range:

If the radio range appears short, then first check to make sure the

transmitter antenna is fully extended and that the antenna in the T-Maxx

3.3 is in place and has not been cut or damaged. Next, make sure the batteries are all fresh or fully charged. Finally, if you are still experiencing short range, try a different location. Sometimes there can be interference from various sources that can cause your radio to malfunction.

Engine will not spin (EZ-Start will not turn the engine):

If neither LED on the controller lights, the EZ-Start battery could be

discharged or improperly connected. Inspect and recharge if necessary.

If the glow plug LED lights and the motor LED does not, then the EZ-Start

controller is in protection mode. Allow the controller to cool for at least three minutes. The circuitry should automatically reset.

Check to make sure the wires are connected to the EZ-Start motor in the

T-Maxx 3.3. The red wire should connect to the positive motor terminal, indicated by a red dot next to the terminal.

The engine could be flooded. If too much fuel accumulates in the

combustion chamber at start up, the engine will hydraulically lock. Follow the procedure on page 29 for clearing a flooded engine.

Check for binding at the engine flywheel. If you are not able to turn the

engine by hand, the engine could be flooded, there could be binding in the clutch system, or there could be internal engine damage. (Note: It is normal for the engine to be extremely tight and hard to turn when the piston reaches the top of the compression stroke.)

Engine extremely sluggish, hard to start, and will not idle during tank 1 of the break in:

It is possible that the factory adjusted break-in settings on your

carburetor are too rich for your geographic location, atmospheric conditions, or fuel brand. Extremes in temperature, humidity, barometric pressure, and altitude can’t always be accounted for with a single highspeed needle setting. The symptoms described above can occur when the air density is very low such as in high mountainous elevations, and extremely cold temperatures. Under these conditions, lean the fuel mixture slightly, 1/8 turn, to see if there is any improvement in starting and idling. Only lean the fuel mixture just until the engine will run and idle reliably and then proceed with the break in.

The contents of different brands of fuel (other than Traxxas Top Fuel)

in combination with extreme atmospheric conditions can also make the factory preset break-in settings too rich and cause the symptoms described above. Again, try leaning the fuel mixture slightly, 1/8 turn, to see if there is any improvement in starting and idling.

Engine spins but will not start:

If the engine is spinning but will not start, first check to make sure that

both the motor and glow plug LEDs on the EZ-Start controller light when the button is depressed. If the glow plug LED does not light, make sure the blue glow plug wire is tightly connected and is not damaged in any way. If the wire is good, then replace the glow plug. It is normal for glow plugs to require periodic replacement. Only use Traxxas heavy-duty long glow plugs (see your parts list).

Check to make sure the fuel is getting to the carburetor. Remove the fuel

line where it connects to the carburetor to see if there is fuel in it. If not, you may need to prime the engine. Reconnect the fuel line and then refer to page 18 for instructions on priming the engine.

Check your fuel mixture settings. It may be necessary to adjust the

fuel mixture if the outside temperature or barometric pressure has changed significantly since the last time the engine was run (see Fine Tuning the Carburetor on page 21). Turn the high-speed needle out (rich/ counterclockwise) 1/4 turn, hold the throttle trigger at about 1/2 throttle and try again to start the engine. Once started, retune the engine for performance (see page 20).

The engine could be worn. If the fit between the piston and sleeve is

loose, compression is reduced and the engine will be difficult to start when it is warm, and may tend to stall when running and when the throttle is closed suddenly to idle. Engine life depends on many factors including fuel type, air filter maintenance, needle settings, and how the engine was used. For example, if the engine was allowed to ingest dirt from lack of air filter maintenance or running through water, then the internal engine components could wear out extremely fast.

Glow plug may have failed. If using an EZ-Start, check to see if the glow

plug light is on during starting. If not, replace the glow plug. If using a glow ignitor, remove and check the glow plug.

Engine performance sluggish:

Engine performance depends mostly on the fuel mixture settings

and how they compensate for the current atmospheric conditions. Before you suspect other failures with the engine, richen the high-speed needle at least 1/4 turn and then retune the engine for performance (see page 20).

If the fuel mixture seems to be set correctly, make sure the fuel is fresh.

If the fuel is old, or was left uncapped for a long period, then some of the important fuel components could have evaporated. Try new, fresh, Traxxas Top Fuel.

Try a new Traxxas glow plug. Sometimes a glow plug will work well

enough to start the engine but not be able to deliver the engine’s full performance potential.

Check to make sure there is no binding in the driveline that would cause

excessive loads on the engine.

T-MAXX 3.3 OWNERS MANUAL

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Page 29

Clearing a Flooded Engine

If the engine is primed for too long during startup, then it can become flooded with fuel. When the engine is flooded it will no longer turn due to excess fuel in the combustion chamber preventing upward movement of the piston. Use the following procedure to clear a flooded engine:

Remove the blue glow plug wire.

2. Remove the glow plug and gasket with the glow plug wrench supplied

with your model. A 5/16 or 8mm nut driver will also work.

3. Turn the model upside down and plug in the EZ-Start controller.

4. Push the EZ-Start button for several seconds to clear the engine

of excess fuel. Do not look into the glow plug hole while the engine is spinning or you could spray fuel into your face!

Turn the model over and reinstall the glow plug and gasket.

6. Reconnect the blue glow plug wire to the glow plug.

Reconnect the EZ-Start controller.

8. Do not prime the engine. Pull the throttle to 1/2 throttle and push

the EZ-Start button. The engine should start immediately.

Piston stuck at “top dead center” (TDC)

“Top dead center” is the position where the piston is at the very top of the tapered sleeve. Occasionally an engine can get “stuck” at this position. This is most likely to happen on new engines during break-in, but can also happen at other times. If the engine is stuck at TDC, use the following procedure to release the piston from the sleeve:

Remove the glow plug using the included tool or 8mm (5/16”) nut driver

and verify that the piston is at the top of its stroke.

Use a flat blade screwdriver to rotate the flywheel. Place the blade of the

driver into one of the grooves of the flywheel and push down, turning the flywheel counter-clockwise when viewed from the front. The flywheel should turn, unsticking the piston from the sleeve.

Put two or three drops of light machine oil into the glow plug hole to

lubricate the piston and sleeve. Do not use too much oil. It will hydro-lock the engine. Verify the starter will spin the engine with the glow plug out.

Rotate the flywheel so the piston is at bottom dead center and replace

the glow plug with gasket. Reconnect the blue glow plug wire.

You should now be able to start

the engine with the EZ-Start.

TROUBLESHOOTING

Top Dead Center

Bottom Dead Center

T-MAXX 3.3 OWNERS MANUAL

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Page 30

INDEX

.15: 11

.20: 11

ABC: 11

Address: 3

After-run: 11, 27

oil: 4

Air lter: 5, 11

foam: 12

housing: 13

pre-filter: 4, 12

primary filter: 4, 12

Air/fuel mixture: 15, 16

Air/fuel ratio: 14, 15

Alignment settings: 24

Altitude: 19, 21

Antenna

receiver antenna: 7

crimp nut: 9

mount: 5, 9

nut wrench: 4, 9

set up: 9

sleeve: 9

tip: 9

tube: 9

transmitter antenna: 7

Batteries: 8

5-cell pack: 7

battery box: 5

NiCad: 4, 7

NiMH: 4, 8

receiver: 8

battery holder: 7

required: 4

RX Power Pack: 4, 8

transmitter: 8

battery compartment: 7

Battery; See also EZ-Start; batteries

BDC: 11

Body mount post: 5

Brake: 5

brake pads: 26

brake setup and adjustment: 26

Brake shoulder screw: 26

Bulkhead: 5

Camber: 24

Carburetor: 11, 13, 15

adjustments: 15

air intake: 13

factory needle settings: 16

fuel intake: 13

high-speed needle: 13

idle speed screw: 13

low-speed needle: 13

slide: 12

throttle arm: 13

Caster: 23

Channel: 7

Chassis: 5

Clean-out: 11

Clutch bell: 13, 25

mesh: 25

Combustion chamber: 11

Crankshaft: 13

Crystal (X-tal): 7, 9

Customer support: 2

Cylinder head: 11, 13

Cylinder sealing: 18

Decals: 6

Differential: 5

Driveshaft: 5

Driving: 22

Dyno: 12

E-mail: 3

Engine (TRX 3.3): 11–21

break-in: 18–19

cold weather: 19

tank 1: 18

tank 2: 19

tank 3: 1

tank 4: 19

tank 5: 19

tank 6: 19

clearing a flood: 29

engine mount: 13

fit: 12

piston: 12

port: 12

priming: 12, 18

shutting off: 17

starting: 17–18

terms: 11

tuning: 20–21

by temperature: 21

Equipment: 4

EZ-Start: 12, 17

battery: 4, 17

charging: 17

controller: 13, 17

drive unit: 13

motor: 5, 13

plug: 5, 13

glow plug wire: 13

ground wire: 13

negative wire: 13

positive wire: 13

Protection mode: 17

Factory needle settings: 16

Flag color: 7

Flame-out: 12

Flywheel: 13

Frequency: 7, 9

Fuel: 4, 12, 14

dispensing bottle: 4, 14

handling: 14

Fuel tank: 5, 13

after-run: 27

filling: 14

fuel line: 12, 13

pressure line: 5, 13

seal adjustment: 14

Gear ratio: 25

Glow plug: 12, 13, 17

driver: 12

fouled: 18

Hex hub: 5, 6

High-speed needle: 12, 13, 15, 16

adjustment: 20

Humidity: 21

Idle speed screw: 12, 13, 16

adjustment: 21

Jumping: 22, 26

Lean: 12, 16, 20–21

Low-speed needle: 12, 15, 16

adjustment: 20

mAh: 7, 17

Maintenance: 27

Needle seat: 16

Needle valve: 12

Neutral position: 7

Nitromethane: 12

percentage: 14

On/Off switch: 5, 7

transmitter: 7, 9

O-ring: 12, 14

Pinch test: 20

Pipe: 12, 13

Pivot ball: 5, 24

pivot ball caps: 23

Punch: 12

Quick Start: 6

Radio System (TQ-3): 7–10

adjustments: 9

batteries: 8

T-MAXX 3.3 OWNERS MANUAL

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Page 31

range-testing: 10

rules: 9

terms: 7

using: 10

Receiver: 7, 8

batteries: 8

channel: 7

receiver box: 5

Rich: 12, 16, 20

rpm: 12

Safety: 3

Servos

steering servo: 5, 7, 10

throttle/brake servo: 5, 7, 9, 10

Shock (Damper): 5

fine tuning: 23

mounting positions: 23–24

tower: 5

Skid plate: 5, 26

Slipper clutch: 5, 25

adjusting: 24

pads: 27

Spur gear: 5

changing: 25

mesh: 25

Stall: 12, 20

Storage: 27

Suspension arm: 5, 24

Suspension tuning: 23

Toe-in: 24

Tools: 4

Top dead center (TDC): 12, 29

Transmission: 5

access plug: 5

adjusting: 25

tuning: 24

Transmitter: 7; See also Radio System (TQ-3)

battery compartment: 7

controls: 10

power indicator: 7, 8

power switch: 7

servo reversing switch: 7, 9

steering trim: 7, 9

steering wheel: 7

throttle neutral adjust: 7, 9

throttle trigger: 7

throttle trim: 7, 9

Troubleshooting: 28

Wheelie Bar: 26

WOT: 12

INDEX

T-MAXX 3.3 OWNERS MANUAL

•

Page 32

owners manual

MODEL 4908

080327 KC1122 Part #5198X

1100 Klein Road, Plano Texas 75074

1-888-TRAXXAS