Duratrax 835B User Manual

TABLE OF CONTENTS

SAFETY PRECAUTIONS AND WARRANTY ...............3 TUNING GUIDE ..................................................8-10

PREPARE TO RUN THE 835B ............................... 4-5

ENGINE RUNNING & MAINTENANCE ......................6 REPLACEMENT PARTS ........................................34+

CONTENTS

™

Duratrax T240F 2.4 GHz Transmitter

Fuel

Bottle

Rx Battery

Charger

Receiver

Battery

ASSEMBLY GUIDE ........................................... 11-33

Engine Stop Tool

Glow

Starter

Chassis

Antenna

Tube

REQUIRES

“C” Alkaline

Battery

(Glow Starter)

Fuel

(ODOP4520)

“AA” Alkaline

Air Filter Oil (DTXC2465)

Batteries x4

(Transmitter)

SAFETY PRECAUTIONS

To prevent injury and damage to property, follow these safety precautions when operating any radio control vehicle.

Keep all spectators a safe distance away from the vehicle. ALWAYS turn the transmitter on before the receiver.

NEVER touch any part of the engine or exhaust as they can become very hot.

ALWAYS keep model engine fuel out of the reach of children and follow

precautions on the container.

NEVER run your model indoors. Fuel powered vehicles create harmful fumes.

NEVER smoke and avoid ignition sources when using model engine fuel.

Model engine fuel is poisonous and ﬂ ammable. Keep away from open ﬂ ame. Use a mat or towel when working on your model to protect your work surface.

Do NOT run your radio control vehicle in cold weather as plastic parts

may become brittle.

WA RNING: This product contains a chemical known to the State of California to

cause cancer.

SPECIFICATIONS & DESCRIPTION CHANGES

All

information found in this manual is subject to change without notice. Visit Duratrax.com for the latest updates and information on your

model. Duratrax maintains no responsibility for inadvertent errors in this manual.

LIMITED WARRANTY

Duratrax guarantees this kit to be free from defects in materials or workmanship for 90 days (3 years for the engine) after the date of purchase. Duratrax will repair or replace at no charge any incorrectly made part.

Your receipt or invoice at time of purchase is your proof of purchase and is required for Duratrax to honor any warranty. Duratrax reserves the right to change or modify this warranty without notice.

For warranty repairs, contact or send to:

Hobby Services

3002 N. Apollo Drive Suite 1

Champaign, IL 61822

ATTN: Service Department

Phone: (217) 398-0007 9:00 am – 5:00 pm Central Time M-F E-mail: hobbyservices@hobbico.com

www.hobbyservices.com

IF the buyer is not prepared to accept the liability associated with the use of this product, buyer is advised to return kit immediately in new and unused condition to the place of purchase.

STRESS-TECH PARTS GUARANTEE

Stress-Tech parts are guaranteed for 12 months from the date of purchase. Check the parts list for items covered under the Stress-Tech guarantee. Should a Stress-Tech part break during the ﬁ rst 12 months after purchase, return the part to Hobby Services and we will send you a FREE replacement.

To receive your FREE replacement Stress-Tech part, include the following and return to Hobby Services at the address above:

1. Broken part

2. Part number and description of the broken part

3. COPY of your dated purchase invoice or receipt

4. Name, phone number and shipping address

REPAIR SERVICE

Hobby Services offers repair services after the 90 day limited warranty or 12 month Stress-Tech parts replacement for a minimal charge.

Follow these instructions for your repair request:

Most circumstances require the return of the ENTIRE vehicle. STRESS-TECH requires ONLY the broken part to be returned following the instructions above.

2. Turn off the transmitter and remove the batteries.

3. Empty fuel tank on nitro vehicles.

4. Include written instructions listing

THOROUGH

phone number. IF you expect the repair to be covered under the 90 day limited warranty, include copy of receipt or invoice with date of purchase.

description of the problem, service needed and your

ALL

items being returned with a

DAYTIME

5. Send to Hobby Services at the address above. When shipping your item(s) to us, we recommend that you insure them and use a company that offers tracking service (such as UPS or Federal Express).

We will carefully inspect your item and notify you of our ﬁ ndings. You will be advised of your options for return, repair, or replacement. Please note that items sent back unrepaired will carry a return shipping and service charge.

Hobby Services accepts Visa®, MasterCard®, or you can send a check. We can return the item C.O.D., but additional charges will apply.

082E

Included radio system is not fully compliant with French regulations.

NiMH

CHARGE THE RECEIVER BATTERY

Remove the battery.

Allow 8 hours to fully charge the battery.

CHECK SCREWS

Double-check all screws and nuts to be sure they are tight.

INSTALL TRANSMITTER BATTERIES

–

INSTALL ANTENNA TUBE AND RECEIVER BATTERY

–

INSTALL GLOW STARTER BATTERY

OIL AIR FILTER

Apply air filter oil (DTXC2465) onto the foam element, squeezing

the element until it is completely coated with the oil.

TIP! Placing the element in a plastic bag will help keep your hands clean.

Remove any excess oil with a paper towel.

If you ever need to re-bind the receiver, turn on the system and press and hold the bind button on the receiver until the L.E.D. turns solid green.

POWER UP TRANSMITTER CHECK THROTTLE

On/Off

2.4 GHz

Check radio operation before each run!

Throttle Reverse Switch

Throttle Trim

Forward

2.4 GHz

Brake

Check radio operation before each run!

Steering Servo Reverse Switch

CHECK STEERING FUEL THE CAR

START THE ENGINE STOP THE ENGINE

Steering Trim

2.4 GHz

Check radio operation before each run!

See page 6 for starting and engine break-in.

To stop your 835b engine, place the pointed end of the engine tool into the exhaust outlet (stinger). This will block the exhaust and stop the engine.

BREAK-IN PROCEDURE

When starting, hold the throttle slightly open. If the engine is difﬁ cult to turn over, loosen glow plug 1/2-turn before starting engine (this allows some compression to escape while allowing the engine to start). Once engine starts, tighten the glow plug.

IMPORTANT! FLOODED ENGINE:

If you are still having problems turning the engine over, it is ﬂ ooded (too much fuel inside the engine).

1. Remove glow plug and turn vehicle upside down, pointing away from you.

2. Pull the recoil 5 times (clearing engine of fuel).

3. Replace glow plug.

4. Repeat starting engine steps.

Engine break in will be accomplished with the ﬁ rst 5 tanks of fuel. (NOTE: Full break-in may take up to 15 tanks.)

1. During break-in, run with the body off to keep the engine cool.

2. Keep air ﬁ lter on at all times.

3. Run on smooth, hard surface.

4. Make sure you have extra glow plugs. Break-in puts stress on the glow plug and it may need to be replaced.

TANK 1

Run very rich allowing fuel to carry as much oil as possible to lubricate internal engine parts.

1. High Speed Needle Valve: Check this setting before running. Close the high speed needle by rotating it clockwise until you just feel resistance, then open to 4 full turns out (counterclockwise).

2. Run at medium speeds, slowly accelerating and decelerating.

3. If engine does not stay running consistently, increase idle speed by turning the idle stop screw clockwise.

4. DO NOT allow the tank to run out of fuel during break-in.

5. Stop engine and allow it to cool approximately 10 – 15 minutes.

TANKS 2-4

1. For each additional tank, lean high speed needle 1/12 turn from the previous tank’s setting.

Stop engine, allowing it to cool approximately 10 – 15 minutes, between each tank.

TANK 5

1. Lean high speed needle an additional 1/12 turn from Tank 4 setting.

2. The engine should now be very close to ﬁ nal tune and be broken in and ready to be performance tuned.

TUNING TIPS (Adjust only after the engine is fully broken in.) IMPORTANT!

test the results.

High Speed Needle:

small amount of smoke. The goal is to tune the engine to make good power without overheating. Engine temperature should stay around 250° F (132° C) using a temperature gauge (Duratrax Flashpoint

Note:

This temperature is a “guideline” only. Your engine may run

slightly warmer or cooler depending on conditions: fuel, track, and how you drive.

Low Speed Needle:

Controls fuel mixture at low throttle settings (idle). To check this setting, keep the throttle at idle and pinch the fuel line

close to the carburetor. A correct setting will increase the engine speed after 2-3 seconds and then lose speed.

• If it slows too quickly, the mixture is too lean. Open the low speed needle (counterclockwise).

• If it takes longer than 4 seconds to slow down, the mixture is too rich. Close the low speed needle (clockwise).

Idle Stop Screw:

Adjust this screw to set the idle speed so the wheels do not rotate when you lift the vehicle off of the ground. When looking

into the carburetor, the barrel should be about 1mm from fully closed.

CARE AND MAINTENANCE

1. Keep engine clean and free of dirt.

2. Do not over lean engine.

3. Run all of the fuel out of the engine before storing.

Use after run oil and work it into the engine by turning the ﬂ ywheel before storing

5. Do not use a fuel with a nitromethane content over 30%.

667

IMPORTANT! FLOODED ENGINE:

1. Remove glow plug and turn vehicle upside down, pointing away from you.

2. Pull the recoil 5 times (clearing engine of fuel).

3. Replace glow plug.

4. Repeat starting engine steps.

Engine break in will be accomplished with the ﬁ rst 5 tanks of fuel. (NOTE: Full break-in may take up to 15 tanks.)

1. During break-in, run with the body off to keep the engine cool.

2. Keep air ﬁ lter on at all times.

3. Run on smooth, hard surface.

4. Make sure you have extra glow plugs. Break-in puts stress on the glow plug and it may need to be replaced.

TANK 1

Run very rich allowing fuel to carry as much oil as possible to lubricate internal engine parts.

1. High Speed Needle Valve: Check this setting before running. Close the high speed needle by rotating it clockwise until you just feel resistance, then open to 4 full turns out (counterclockwise).

2. Run at medium speeds, slowly accelerating and decelerating.

3. If engine does not stay running consistently, increase idle speed by turning the idle stop screw clockwise.

4. DO NOT allow the tank to run out of fuel during break-in.

5. Stop engine and allow it to cool approximately 10 – 15 minutes.

If you are still having problems turning the engine over, it is ﬂ ooded (too much fuel inside the engine).

~1mm

HIGH SPEED

NEEDLE

LOW SPEED

NEEDLE

IDLE STOP

SCREW

TANKS 2-4

1. For each additional tank, lean high speed needle 1/12 turn from the previous tank’s setting.

Stop engine, allowing it to cool approximately 10 – 15 minutes, between each tank.

TANK 5

1. Lean high speed needle an additional 1/12 turn from Tank 4 setting.

2. The engine should now be very close to ﬁ nal tune and be broken in and ready to be performance tuned.

TUNING TIPS (Adjust only after the engine is fully broken in.) IMPORTANT! Always run the engine for 1-2 minutes to warm up temperature before tuning! Only use “small” adjustments (1/12 turn at a time) and

test the results.

High Speed Needle: Controls the fuel/air mixture at high throttle settings. A properly tuned engine will accelerate smoothly and exhaust a

small amount of smoke. The goal is to tune the engine to make good power without overheating. Engine temperature should stay around 250° F (132° C) using a temperature gauge (Duratrax Flashpoint™, DTXP3100). slightly warmer or cooler depending on conditions: fuel, track, and how you drive.

Low Speed Needle:

close to the carburetor. A correct setting will increase the engine speed after 2-3 seconds and then lose speed.

• If it slows too quickly, the mixture is too lean. Open the low speed needle (counterclockwise).

• If it takes longer than 4 seconds to slow down, the mixture is too rich. Close the low speed needle (clockwise).

Idle Stop Screw:

into the carburetor, the barrel should be about 1mm from fully closed.

CARE AND MAINTENANCE

1. Keep engine clean and free of dirt.

2. Do not over lean engine.

3. Run all of the fuel out of the engine before storing.

Use after run oil and work it into the engine by turning the ﬂ ywheel before storing

5. Do not use a fuel with a nitromethane content over 30%.

Always run the engine for 1-2 minutes to warm up temperature before tuning! Only use “small” adjustments (1/12 turn at a time) and

Controls the fuel/air mixture at high throttle settings. A properly tuned engine will accelerate smoothly and exhaust a

, DTXP3100).

Controls fuel mixture at low throttle settings (idle). To check this setting, keep the throttle at idle and pinch the fuel line

Adjust this screw to set the idle speed so the wheels do not rotate when you lift the vehicle off of the ground. When looking

Note:

This temperature is a “guideline” only. Your engine may run

Engine Tools & Accessories

Engine Tuning Screwdriver

Standard slot-head screwdriver has a 120 mm hardened steel shaft with 3.2 mm wide magnetized tip and rubberized, hexagonal handle.

DTXR0185

™

TrakPower

Speed Wash

Nitro Cleaner

Applies with or without water and is safe for titanium, aluminum, ﬁberglass, clear coat, stainless steel, chrome, rubber, plastic, vinyl and leather. 32 ﬂ oz (946 mL).

TKPC8001

Air Filter Oil

Treats foam air ﬁlter elements to increase ﬁltering capacity and extend engine life. Handy

1.75 ﬂ oz (51.7 mL) bottle ﬁts easily into a tool box or tote.

DTXC2465

Rapid Heat

Twist-on for a secure connection to heat your glow plug. Twist the other way for easy removal. Includes NiCd and AC charger.

DTXP3000

™

Glo-Starter

Deluxe Car Wrenches

Deluxe includes 6 socket head sizes and stores up to 4 glow plugs. Ultimate adds a slotted/Phillips screwdriver bit and 19 mm socket for 1/8 car wheel nuts.

DTXR1170 DTXR1175

Kwik-Pit

A squeeze on the clear plastic body lets you control fuel ﬂow. The 5 in (63.5 mm) long aluminum spout features a curved tip for no-spill reﬁlls and a tip cap to prevent leaks. For glow fuel only.

DTXP0125 DTXP0150

Deluxe Car Wrench Ultimate Car Wrench

™

Fuel Bottles

250 cc (8.5 ﬂ oz) Fuel Bottle 500 cc (17.0 ﬂ oz) Fuel Bottle

O’Donnell Racing Fuel

Speed Blend improves fuel economy and pushes engine performance to the absolute peak. Race Blend simpliﬁes tuning and reduces engine heat and internal wear.

ODOP3320 ODOP3325 ODOP3330 ODOP4520 ODOP4525 ODOP4530

20% Racing Fuel Quart 25% Racing Fuel Quart 30% Racing Fuel Quart 20% Speed Blend Quart 25% Speed Blend Quart 30% Speed Blend Quart

rench

FlashPoint™ Infrared Temperature Gauge

Glow Plugs

Hand-assembled with heat resistant coils. Carbon Speed is medium-hot for informal racing and sport use. Gold Racing Plug is for higher nitro fuels and competitive driving.

DTXG3003 DTXG3005

Carbon Speed Plug Gold Racing Plug

Just point and press for fast, accurate, no-touch temperature readings of engines, motors, batteries and more. Works in seconds and turns off automatically after 15 seconds of inactivity.

DTXP3100

TUNING GUIDE

As a starting point, make sure your car has equal lengths on shocks, camber links and steering rods on both sides (left and right). Front and rear do not need to be equal.

Rear Hole:

Forward Hole:

Negative Camber

Positive Camber

Toe-Out:

Toe-In:

Toe-In

Lower Rear:

More rear traction but reduces steering.

Lower Front:

Increases steering but can cause rear

end to lose traction.

As a starting point, make sure your car has equal lengths on shocks, camber links and steering rods on both sides (left and right). Front and rear do not need to be equal.

CAMBER

Angle of the tire and wheel in relation to the ground when viewed from the front.

Negative Camber =

• Improved traction while corning.

• Adds overall stability.

Positive Camber = Tire and wheel lean outward (NOT recommended).

Top of the tire and wheel lean inward (Typically 0° to -2°)

FRONT TOE-IN AND TOE-OUT

Direction the wheels point in relationship with each other, when viewed from the front.

Toe-In: Front of the wheels point toward each other. (Typically 0 to -2°)

• Increased stability when accelerating. Decreased steering when entering a corner.

Toe-Out: Fronts of the wheels point away from each other.

• Decreased stability when accelerating and increased steering when entering a corner.

ACKERMAN

The difference in turning angle between the inside wheel and outside wheel in a turn.

Toe-In

Forward Hole: More initial steering into corner. Steering is

more aggressive. Better for tight technical tracks.

Rear Hole: Less initial steering into a corner. Smoother steering response. Better for large ﬂ owing tracks.

RIDE HEIGHT

Distance the chassis sits from the ground and how much weight is transferred when the vehicle changes speed and direction.

Rotate the collar on the shock to change ride height. Adjust left and right equally.

Lower Rear:

More rear traction but reduces steering.

Lower Front:

end to lose traction.

Increases steering but can cause rear

SHOCK ADJUSTMENTS

More Front Droop:

Increases chassis up travel when on throttle and decreases high speed steering,

making vehicle turn smoother. Good for low traction and bumpy surfaces.

Less Front Droop:

Decreases chassis up travel when on throttle, making steering more aggressive.

Good for high speed smooth surfaces.

More Rear Droop:

Increases chassis up travel when off throttle and under braking. Increases

steering in low speed corners and under braking.

Less Rear Droop:

Decreases steering in low speed corners, making the vehicle turn smoother.

Higher Roll Center:

Increases the chassis roll on the rear of the car. Increases rear traction on-power. Decreases rear traction during braking.

Lower

Roll Center:

Decreases the chassis roll at the rear of the car. Decreases rear on-power traction. Reduces corner entry steering. Increases corner exit steering.

Higher Roll Center:

Reduces chassis roll and on-power steering. The car feels more responsive. Reduces front traction going into corners. Good for high grip, technical tracks.

Lower

Roll Cente

Increases the chassis roll and on-power steering. Steering is less responsive, but smoother and more stable. Better for smooth tracks with high speed corners.

FRONT ROLL CENTER

REAR ROLL CENTER

DROOP

Distance the chassis can lift from ride height before the wheels come off the ground.

More Front Droop:

Less Front Droop:

More Rear Droop:

Less Rear Droop:

Increases chassis up travel when on throttle and decreases high speed steering,

making vehicle turn smoother. Good for low traction and bumpy surfaces.

Decreases chassis up travel when on throttle, making steering more aggressive.

Good for high speed smooth surfaces.

Increases chassis up travel when off throttle and under braking. Increases

steering in low speed corners and under braking.

Decreases steering in low speed corners, making the vehicle turn smoother.

ROLL CENTER

Point at which the vehicle rolls laterally when cornering.

FRONT ROLL CENTER

Higher Roll Center:

steering. The car feels more responsive. Reduces front traction going into corners. Good for high grip, technical tracks.

Lower

Roll Center:r:

steering. Steering is less responsive, but smoother and more stable. Better for smooth tracks with high speed corners.

Reduces chassis roll and on-power

Increases the chassis roll and on-power

REAR ROLL CENTER

Higher Roll Center:

of the car. Increases rear traction on-power. Decreases rear traction during braking.

Lower

Roll Center:

the car. Decreases rear on-power traction. Reduces corner entry steering. Increases corner exit steering.

Increases the chassis roll on the rear

Decreases the chassis roll at the rear of

101010

Check before every run:

1. All hardware to be sure everything is tight.

2. Transmitter batteries.

3. Moving parts are free from binding.

4. Parts are not broken or damaged.

5. Wires are properly connected.

6. Remove dirt or debris from chassis and moving parts.

7. Bearings should roll smoothly.

8. Shocks should operate smoothly. Check for leakage and reﬁ ll as needed.

9. Gear mesh between the spur and clutch gears.

WHEELBASE

Decreases off power steering. Better through rough sections. More stable. More on power steering.

Increases rear on power traction. More off power steering.

Thinner:

Increased traction. Chassis transitions quicker. Increased chance of the chassis

bottoming out. Better for rough tracks

Thicker:

Decreased traction. Chassis transitions slower. Decreased chance of chassis

bottoming out. Better for smooth tracks.

FRONT:

Thinner:

Increased off power steering (too thin will make it inconsistent.) Decreased on power steering.

Thicker:

Increased stability while braking into a corner. Increased on power steering exiting a corner.

CENTER:

Thinner:

Better for rough track conditions. Causes the front to unload under acceleration. Decreases on power steering.

Thicker:

Better acceleration. Increases on power steering. Less stable. Better for smooth high bite tracks.

REAR:

Thinner:

More rear traction in the corners. Increases mid corner steering.

Thicker:

Decreases rear traction in the corners. Increases forward traction. Less mid corner steering

SHORTER WHEELBASE

MEDIUM WHEELBASE

LONGER WHEELBASE

Distance between the front and rear wheels.

SHORTER WHEELBASE

Increases rear on power traction. More off power steering.

SHOCK OIL

MEDIUM WHEELBASE

LONGER WHEELBASE

Decreases off power steering. Better through rough sections. More stable. More on power steering.

Thinner:

bottoming out. Better for rough tracks

Thicker:

bottoming out. Better for smooth tracks.

Increased traction. Chassis transitions quicker. Increased chance of the chassis

Decreased traction. Chassis transitions slower. Decreased chance of chassis

DIFFERENTIAL OIL

FRONT:

CENTER:

REAR:

Thinner: Thicker:

Increased off power steering (too thin will make it inconsistent.) Decreased on power steering.

Increased stability while braking into a corner. Increased on power steering exiting a corner.

Better for rough track conditions. Causes the front to unload under acceleration. Decreases on power steering.

Better acceleration. Increases on power steering. Less stable. Better for smooth high bite tracks.

More rear traction in the corners. Increases mid corner steering.

Decreases rear traction in the corners. Increases forward traction. Less mid corner steering

CHASSIS MAINTENANCE TIPS

Check before every run:

1. All hardware to be sure everything is tight.

2. Transmitter batteries.

3. Moving parts are free from binding.

4. Parts are not broken or damaged.

5. Wires are properly connected.

6. Remove dirt or debris from chassis and moving parts.

7. Bearings should roll smoothly.

8. Shocks should operate smoothly. Check for leakage and reﬁ ll as needed.

9. Gear mesh between the spur and clutch gears.

FOR MAINTENANCE AND REPAIRS ON YOUR 835B

B (x3)

8x16mm

BB (x3)

4x5mm

FF (x3)

6x10mm

120 (x3)

2.5x13mm

EE (x12)

4x7mm

B (x2)

8x16mm

FF (x2)

6x10mm

120 (x2)

2.5x13mm

131313

B (x1)

8x16mm

FF (x1)

6x10mm

120 (x1)

2.5x13mm

R (x12)

3x12mm

B (x2)

8x16mm

BB (x1)

4x5mm

E (x2)

3x10mm

JJ (x4)

4mm

E (x1)

3x10mm

155 (x2)

4x37mm

156 (x2)

4x62mm

Y (x2)

3x30mm

151515

E (x2)

3x10mm

L (x4)

4x12mm

B (x4)

8x16mm

L (x4)

4x12mm

BB (x2)

4x5mm

108 (x2)

2.5x16mm

161616

CC (x2)

4x12mm

HH (x2)

3mm

152 (x2)

3x40mm

169 (x2)

19 (x2)

5x30mm

+ 37 hidden pages