Traxxas 82066-4 User Manual

MODEL 82066-4

owner’s manual

introduction

3 BEFORE YOU

PROCEED

4 SAFETY

PRECAUTIONS

7 TOOLS, SUPPLIES,

AND REQUIRED

EQUIPMENT

8 ANATOMY OF

THE TRX-4 TACTICAL

UNIT

10 QUICK START:

GETTING UP

TO SPEED

11 TRAXXAS TQ

RADIO SYSTEM

18 ADJUSTING THE

ELECTRONIC SPEED

CONTROL

21 DRIVING YOUR MODEL

25 TUNING

ADJUSTMENTS

30 MAINTAINING

YOUR MODEL

i

Thank you for purchasing the Traxxas TRX-4 Tactical Unit. The
design of the TRX-4 instantly obsoletes the status quo with greatly
expanded features and versatility. The TRX-4 features the powerful
Titan® 21T 550 motor, waterproof electronics, and a smooth XL-5
HV 3s LiPo-capable electronic speed control. The game-changing
portal axles provide greater ground clearance while the rigid steel
frame eliminates chassis flex and allows you to navigate tough
terrain. The Canyon Trail 1.9 tires feature tuned foam inserts to
deliver superior bite on rocky surfaces with convincing scale
realism. In other words, we built it the Traxxas way -- rugged,
powerful, and ready to handle the rigors of remote locations and
all-day driving fun!

This manual contains the instructions you will need to operate and
maintain your model so that you can enjoy it for years to come.
We want you to feel confident that you own one of the best­performing models in the market and that it is backed by a team
of professionals who aim to provide the highest level of factory
support possible. Traxxas models are about experiencing total
performance and satisfaction, not just with your model, but also
with the company that stands behind it.

We know you’re excited about getting your new model on the trail,
but it’s very important that you take some time to read through the
Owner’s Manual. This manual contains all the necessary setup and
operating procedures that allow you to unlock the performance
and potential that Traxxas engineers designed into your model.

Even if you are an experienced R/C enthusiast, it’s important to
read and follow the procedures in this manual.

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 model!

Traxxas Support

Traxxas support is with you every step of the
way. Refer to the next page to find 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 find 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 10 to begin.

REGISTERING YOUR MODEL

In order to serve you better as our customer, please
register your product within 10 days of your purchase
online at Traxxas.com/register.

Traxxas.com/register

31 TQ

TUNING GUIDE

2 • TRX-4

i

ADVANCED

FCC Compliance

This device contains a module that complies with the limits for a Class B digital device as described in part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This
device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

The limits for a Class B digital device are designed to provide reasonable protection against harmful interference in residential settings. This product generates, uses and can radiate radio
frequency energy, and, if not operated in accordance with the instructions, may cause harmful interference to radio communications. The user is cautioned that changes or modifications
not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

Canada, Industry Canada (IC)

This Class B digital apparatus complies with Canadian ICES-003 and RSS-210. This device complies with Industry Canada license exempt RSS standard(s). Operation is subject to the
following two conditions: This device may not cause interference, and This device must accept any interference, including interference that may cause undesired operation of the device.

Radio Frequency (RF) Exposure Statement

This equipment complies with radio frequency exposure limits set forth by FCC and Industry Canada for an uncontrolled environment. This equipment should be installed and
operated with a minimum distance of 20 centimeters between the radiator and your body or bystanders and must not be co-located or operating in conjunction with any other
antenna or transmitter.

before you proceed

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

Before running your model, look over this entire manual and
examine the model carefully. If for some reason you decide it is not
what you wanted, then do not continue any further. Your hobby

dealer absolutely cannot accept a model for return or exchange
after it has been run.

Warnings, Helpful Hints, & Cross-References

Throughout this manual, you’ll notice warnings and helpful hints
identified 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.

SUPPORT

If you have any questions about your model 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 8:30am
to 9:00pm central time. Technical assistance is also available at
Traxxas.com. You may also e-mail customer support with your
question at [e-mail]. Join thousands of registered
members in our online community at Traxxas.com.

Traxxas offers a full-service, on-site repair facility to handle any
of your Traxxas service needs. Maintenance and replacement
parts may be purchased directly from Traxxas by phone or online
at Traxxas.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 satisfied with your new model!

Traxxas
6250 Traxxas Way
McKinney, Texas 75070
Phone: [phone]
Toll-free 1-888-TRAXXAS

Internet
Traxxas.com
E-mail: [e-mail]

Entire contents ©2017 Traxxas.
All rights reserved. Traxxas,
Ready-To-Drive, TQi, Titan,
TRX-4, and XL-5 HV 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 identification.
No part of this manual may
be reproduced or distributed
in print or electronic media
without the express written
permission of Traxxas.
Specifications are subject to
change without notice.

*Toll-free support is available to U.S. residents only.

TRX-4 • 3

SAFETY PRECAUTIONS

All instructions and
precautions outlined in this
manual should be strictly
followed to ensure safe
operation of your model.

This model is not intended
for use by children under
14 years of age without the
supervision of a responsible
and knowledgeable adult.

No previous experience
with radio controlled
models is required.
Models require a minimum
of setup, maintenance, or
support equipment.

All of us at Traxxas want you to safely enjoy your new model.
Operate your model sensibly and with care, and it will be exciting,
safe, and fun for you and those around you. Failure to operate your
model 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

• Your model is not intended for use on public roads or congested
areas where its operation can conflict with or disrupt pedestrian or
vehicular traffic.

• Never, under any circumstances, operate the model in crowds of
people. Your model could cause injury if allowed to collide with
anyone.

• Because your model is controlled by radio, it is subject to radio
interference from many sources that are beyond your control.
Since radio interference can cause momentary losses of radio
control, always allow a safety margin in all directions around the
model in order to prevent collisions.

• The motor, battery, and speed control can become hot during use.
Be careful to avoid getting burned.

• Don’t operate your model at night, or anytime your line of sight to
the model may be obstructed or impaired in any way.

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

Speed Control

Your model’s electronic speed control (ESC) is an extremely
powerful electronic device capable of delivering high current.
Please closely follow these precautions to prevent damage to the
speed control or other components.

• Disconnect the Battery: Always disconnect the battery from the
speed control when not in use.

• Insulate the Wires: Always insulate exposed wiring with heat
shrink tubing to prevent short circuits.

•

6-7 NiMH cells or 2-3 LiPo cells (2s/3s): The XL-5 HV can accept a

maximum input voltage of 8.4 volts (NiMH) or 11.1 volts (3s LiPo).
Always adhere to the minimum and maximum limitations of the
XL-5 HV as stated in the specifications table.

• Transmitter on First: Switch on your transmitter first before
switching on the speed control to prevent runaways and erratic
performance.

• Don’t Get Burned: The ESC and motor can become extremely hot
during use, so be careful not to touch them until they cool. Supply
adequate airflow for cooling.

• Use the Factory-Installed Connectors: Do not change the battery
and motor connectors. Improper wiring can cause fire or damage
to the ESC. Please note that modified speed controls can be
subject to a rewiring fee when returned for service.

• No Reverse Voltage: The ESC is not protected against reverse
polarity voltage.

• No Schottky Diodes: External Schottky diodes are not compatible
with reversing speed controls. Using a Schottky diode with your
Traxxas speed control will damage the ESC and void the 30-day
warranty.

Recycling Traxxas Power Cell NiMH Batteries

Traxxas strongly encourages you to recycle Power Cell NiMH
batteries when they reach the end of their useful life. Do not throw
batteries in the trash. All Power Cell NiMH battery packs display the
RBRC (Rechargeable Battery Recycling Corporation) icon, indicating
they are recyclable. To find a recycling center near you, ask your
local hobby dealer or visit www.call2recycle.org.

4 • TRX-4

1

WARNING! CAUTION! DANGER!

batteries. Charging and discharging batteries has the
potential for fire, explosion, serious injury, and property damage
if not performed per the instructions. Before use, read and follow
all manufacturer’s instructions, warnings, and precautions. In
addition, Lithium Polymer (LiPo) batteries pose a SEVERE risk of
fire if not properly handled per the instructions and require special
care and handling procedures for long life and safe operation. LiPo
batteries are intended only for advanced users that are educated
on the risks associated with LiPo battery use. Traxxas does not
recommend that anyone under the age of 14 use or handle LiPo
battery packs without the supervision of a knowledgeable and
responsible adult. Dispose of used batteries according to the
instructions.

Important Warnings for users of Lithium Polymer (LiPo)
batteries:

• LiPo batteries have a minimum safe discharge voltage threshold
that should not be exceeded. The electronic speed control is
equipped with built-in Low-Voltage Detection that alerts the
driver when LiPo batteries have reached their minimum voltage
(discharge) threshold. It is the driver’s responsibility to stop
immediately to prevent the battery pack from being discharged
below its safe minimum threshold.

• Low-Voltage Detection is just one part of a comprehensive plan
for safe LiPo battery use. It is critical to follow all instructions for
safe and proper charging, use, and storage of LiPo batteries. Make
sure you understand how to use your LiPo batteries. If you have
questions about LiPo battery usage, please consult with your local
hobby dealer or contact the battery manufacturer. As a reminder,
all batteries should be recycled at the end of their useful life.

• ONLY use a Lithium Polymer (LiPo) balance charger with a balance
adapter port to charge LiPo batteries. Never use NiMH or NiCad­type chargers or charge modes to charge LiPo batteries. DO NOT
charge with a NiMH-only charger. The use of a NiMH or NiCad
charger or charge mode will damage the batteries and may cause
fire and personal injury.

• NEVER charge LiPo battery packs in series or parallel. Charging
packs in series or parallel may result in improper charger cell
recognition and an improper charging rate that may lead to
overcharging, cell imbalance, cell damage, and fire.

FIRE HAZARD!

Your model is able to use LiPo

SAFETY PRECAUTIONS

• ALWAYS inspect your LiPo batteries carefully before
charging. Look for any loose leads or connectors,
damaged wire insulation, damaged cell packaging, impact
damage, fluid leaks, swelling (a sign of internal damage), cell
deformity, missing labels, or any other damage or irregularity.
If any of these conditions are observed, do not charge or use
the battery pack. Follow the disposal instructions included with
your battery to properly and safely dispose of the battery.

• DO NOT store or charge LiPo batteries with or around other
batteries or battery packs of any type, including other LiPos.

• Store and transport your battery pack(s) in a cool dry place.
DO NOT store in direct sunlight. DO NOT allow the storage
temperature to exceed 140°F or 60°C, such as in the trunk of a
car, or the cells may be damaged and create a fire risk.

• DO NOT disassemble LiPo batteries or cells.

• DO NOT attempt to build your own LiPo battery pack from
loose cells.

Charging and handling precautions for all battery types:

• BEFORE you charge, ALWAYS confirm that the charger
settings exactly match the type (chemistry), specification, and
configuration of the battery to be charged.

• DO NOT attempt to charge non-rechargeable batteries (explosion
hazard), batteries that have an internal charge circuit or a protection
circuit, batteries that have been altered from original manufacturer
configuration, or batteries that have missing or unreadable labels,
preventing you from properly identifying the battery type and
specifications.

• DO NOT exceed the maximum manufacturer recommended charge
rate.

• DO NOT let any exposed battery contacts or wires touch each other.
This will cause the battery to short circuit and create the risk of fire.

• While charging or discharging, ALWAYS place the battery (all
types of batteries) in a fire retardant/fire proof container and on
a non-flammable surface such as concrete.

• DO NOT charge batteries inside of an automobile. DO NOT charge
batteries while driving in an automobile.

• NEVER charge batteries on wood, cloth, carpet, or on any other
flammable material.

• ALWAYS charge batteries in a well-ventilated area.

(continued on next page)

TRX-4 • 5

SAFETY PRECAUTIONS

(continued from previous page)

• REMOVE flammable items and combustible materials from the
charging area.

• DO NOT leave the charger and battery unattended while
charging, discharging, or anytime the charger is ON with a battery
connected. If there are any signs of a malfunction or in the event
of an emergency, unplug the charger from the power source and
disconnect the battery from the charger.

• DO NOT operate the charger in a cluttered space, or place objects
on top of the charger or battery.

• If any battery or battery cell is damaged in any way, DO NOT charge,
discharge, or use the battery.

• Keep a Class D fire extinguisher nearby in case of fire.

• DO NOT disassemble, crush, short circuit, or expose the batteries to
flame or other source of ignition. Toxic materials could be released.
If eye or skin contact occurs, flush with water.

• If a battery gets hot to the touch during the charging process
(temperature greater than 110°F / 43°C), immediately disconnect
the battery from the charger and discontinue charging.

• Allow the battery pack to cool off between runs (before charging).

• ALWAYS unplug the charger and disconnect the battery when not
in use.

• ALWAYS unplug the battery from the electronic speed control when
the model is not in use and when it is being stored or transported.

• DO NOT disassemble the charger.

• REMOVE the battery from your model or device before charging.

• DO NOT expose the charger to water or moisture.

• ALWAYS store battery packs safely out of the reach of children
or pets. Children should always have adult supervision when
charging and handling batteries.

• Nickel-Metal Hydride (NiMH) batteries must be recycled or
disposed of properly.

• Always proceed with caution and use good common sense at all
times.

6 • TRX-4

tools, supplies, and required equipment

Your model 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

Required Equipment

(not included)

1.5mm “L” wrench2.5mm “L” wrench

EZ-Peak™ Plus

(part #2970)

4-way wrench2.0mm “T” wrench

For more information on
batteries, see Use the Right
Batteries on page 13.

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

• Traxxas Ultra Premium Tire
Glue, Part #6468 (CA glue)

• Hobby knife

• Side cutters and/or needle
nose pliers

• Phillips screwdriver

• Soldering iron

6 or 7-cell NiMH battery pack, or 2s/3s LiPo battery
pack, with Traxxas High-Current connector*

*Battery and charger style are subject to change and may vary from images.

4 AA alkaline batteriesBattery charger

Traxxas iD battery chargers are compatible
with Traxxas High-Current Connectors

TRX-4 • 7

ANATOMY OF THE TRX-4 TACTICAL UNIT

Chassis Top View

Battery Compartment

Rear Body Mount

Traxxas High-Current Connector

Transmission

Shifting Servo

Electronic Speed ControlBattery Hold-Down

Transmission

Slipper Clutch

Motor

Front Body Mount

Front Bumper

Rear Bumper

Chassis Rail

8 • SUMMIT

Antenna Mount

Rock Slider

Receiver Box

Front T-Lock Servo

LED Light Pipe

Rear T-Lock Servo

Steering Servo

Steering Linkage

Chassis Bottom View

ANATOMY OF THE TRX-4 TACTICAL UNIT

Rear Axle Front AxleRear Portal Housing Front Portal Housing

Chassis Rail

Shock Skidplate

Rear Upper Link Front Upper Link

Rear Driveshaft

Front T-Lock Cable

Differential Cover

Rear T-Lock Cable

Floor Pan Caster BlockRear Lower Link Front Lower Link

Front Driveshaft

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.

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 the bottom
corners of Quick Start pages.

1. Read the safety precautions on page 4 6. Check servo operation • See page 16

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

2. Install batteries in the transmitter • See page 13 7. Range test the radio system • See page 16

The transmitter requires 4 AA alkaline batteries (sold separately). Follow this procedure to make sure your radio system works properly

3. Charge the battery pack • See page 13 8. Detail your model • See page 11

Your model requires a battery pack and a compatible battery
charger (not included). Never use a NiMH or NiCad charger to
charge LiPo batteries.

4. Install battery packs in the model • See page 14 9. Drive your model • See page 21

Your model requires a fully charged battery pack (not included). Driving tips and adjustments for your model.

5. Turn on the radio system • See page 15 10. Maintaining your model • See page 30

Make a habit of turning the transmitter on first and off last. Follow these critical steps to maintain the performance

Make sure the steering servos are working correctly.

at a distance and that there is no interference from outside sources.

Apply other decals if desired.

of your model and keep it in excellent running condition.

Look for the Quick Start
logo at the bottom of
Quick Start pages.

10 • TRX-4

TRAXXAS TQi RADIO SYSTEM

INTRODUCTION

Your model includes the latest Traxxas TQi 2.4GHz transmitter with Traxxas

™

Link

Model Memory. The transmitter’s easy-to-use design provides instant
driving fun for new R/C enthusiasts, and also offers a full complement of
pro-level tuning features for advanced users – or anyone interested in
experimenting with the performance of their model. The steering and
throttle channels feature adjustable Exponential, End Points, and Sub­Trims. Steering and braking Dual-Rate are also available. Many of the
next-level features are controlled by the Multi-Function knob, which can
be programmed to control a variety of functions. The detailed instructions
(page 31) and Menu Tree (page 34) included in this manual will help you
understand and operate the advanced functions of the new TQi radio
system. For additional information and how-to videos, visit Traxxas.com.

RADIO AND POWER SYSTEM TERMINOLOGY

Please take a moment to familiarize yourself with these radio and power
system terms. They will be used throughout this manual. A detailed
explanation of the advanced terminology and features of your new radio
system begins on page 31.

BEC (Battery Eliminator Circuit) - The BEC can either be in the receiver or in

the ESC. This circuit allows the receiver and servos to be powered by the
main battery pack in an electric model. This eliminates the need to carry a
separate pack of 4 AA batteries to power the radio equipment.

Current - Current is a measure of power flow through the electronics,

usually measured in amps. If you think of a wire as a garden hose, current
is a measure of how much water is flowing through the hose.

ESC (Electronic Speed Control) - An electronic speed control is the electronic

motor control inside the model. The EVX-2 uses MOSFET power transistors
to provide precise, digital proportional throttle control. Electronic speed
controls use power more efficiently than mechanical speed controls so
that the batteries run longer. An electronic speed control also has circuitry
that prevents loss of steering and throttle control as the batteries lose their
charge.

Frequency band - The radio frequency used by the transmitter to send

signals to your model. This model operates on the 2.4GHz direct­sequence spread spectrum.

LiPo - Abbreviation for Lithium Polymer. Rechargeable LiPo battery packs

are known for their special chemistry, which allows extremely high energy
density and current handling in a compact size. These are high performance
batteries that require special care and handling. LiPo battery packs are for
advanced users only.

mAh – Abbreviation for milliamp hour, a 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.

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 model that receives signals from the

transmitter and relays them to the servos.

Resistance - In an electrical sense, resistance is a measure of how an

object resists or obstructs the flow of current through it. When flow is
constricted, energy is converted to heat and is lost.

Servo - Small motor unit in your model that operates the steering mechanism.

Transmitter - The hand-held radio unit that sends throttle and steering

instructions to your model.

Trim - The fine-tuning adjustment of the neutral position of the servos,

made by adjusting the throttle and steering trim knobs on the face of the
transmitter. Note: The Multi-Function knob must be programmed to serve as

a throttle trim adjustment.

Thermal Shutdown Protection - Temperature sensing electronics are

used in the ESC to detect overloading and overheating of the transistor
circuitry. If excessive temperature is detected, the unit automatically shuts
down to prevent damage to the electronics.

2-channel radio system - The TQ radio system, consisting of the receiver,

the transmitter, and the servos. The system uses two channels: one to
operate the throttle and one to operate the steering.

2.4GHz Spread Spectrum – This model is equipped with the latest R/C
technology. Unlike AM and FM systems that require frequency crystals
and are prone to frequency conflicts, the TQi system automatically selects
and locks onto an open frequency and offers superior resistance to
interference and “glitching.”

Voltage - Voltage is a measure of the electrical potential difference between

two points, such as between the positive battery terminal and ground.
Using the analogy of the garden hose, while current is the quantity of
water flow in the hose, voltage corresponds to the pressure that is forcing
the water through the hose.

550 and 540 - These numbers refer to the size of the motor. 550 motors

have armatures that are 30% longer than 540 motors.

Applying the Decals

The main decals for your
model have been applied at
the factory. Additional decals
are printed on self-adhesive
clear mylar and are die-cut
for easy removal. Use a
hobby knife to lift the corner
of a decal and lift it from the
backing.

To apply the decals, place
one end down, hold the
other end up, and gradually
smooth the decal down with
your finger as you go. This
will prevent air bubbles.
Placing both ends of the
decal down and then trying
to smooth it out will result
in air pockets. Look at the
photos on the box for typical
decal placement.

8

TRX-4 • 11

TRAXXAS TQi RADIO SYSTEM

XL-5 HV Wiring Diagram

XL-5

HV

ESC

Your model is equipped with the newest TQi 2.4GHz
transmitter with Traxxas Link™ Model Memory. The transmitter
has five channels for controlling your throttle, steering, front
and rear T-Lock differentials, and 2-speed transmission. The
receiver inside the model has 5 output channels. Your model
is equipped with four servos and an electronic speed control.

TRANSMITTER AND RECEIVER

Set Button

Red/Green Status LED

see page 32 for more info

Menu Button

Steering
Trim

Multi-Function
Knob

Shift Switch
(Channel 3)

Throttle
Trigger

Throttle Neutral Adjust

T-Lock Switch (Channel 4)

Steering

Wheel

Sensor Expansion

Port

MODEL WIRING DIAGRAM

Channel 4
Front T-Lock
Servo

Antenna

V/T - Voltage/Temp Sensor Port**
RPM - RPM Sensor Port**
BATT/

CH5 - Battery/Channel 5
CH4 - Channel 4
CH3 - Channel 3
CH2 - Speed Control
CH1 - Steering Servo

** Accessory sensor port for use with TQi Docking Base (see Traxxas.com and included materials for more information)

**

XL-5 HV ELECTRONIC SPEED CONTROL

CH1 - Channel 1

To Motor

Channel 1
Steering Servo

Channel 3
Shift Servo

Channel 2

XL-5 HV

Electronic

Speed Control

Channel 5
Rear T-Lock
Servo

To Accessory
Lighting

Motor
(Titan

®

550)

12 • TRX-4

Link
Button

LED

Power Switch Battery Compartment

** Accessory sensor port for use with the Telemetry Expander Module (see Traxxas.com for more information)

Traxxas High-Current

Connector (Male)

to Battery

LED

EZ-Set
Button

TRAXXAS TQi RADIO SYSTEM

INSTALLING TRANSMITTER BATTERIES

Your TQi transmitter uses 4 AA batteries. The battery
compartment is located in the base of the transmitter.

1. Remove the battery compartment door by pressing the tab
and sliding the door open.

2. Install the batteries in the correct orientation as indicated in
the battery compartment.

3. Reinstall the battery door and snap it closed.

4. Turn on the transmitter and check the status indicator for a
solid green light.

If the status LED flashes red, the transmitter
batteries may be weak, discharged or possibly
installed incorrectly. Replace with new batteries.
The power indicator light does not indicate the
charge level of the battery pack installed in the
model. Refer to the Troubleshooting section on page 32 for more
information on the transmitter Status LED codes.

SELECTING BATTERIES AND A CHARGER

FOR YOUR MODEL

Your model does not include a battery or charger. The speed control in
the model is compatible with both LiPo and NiMH batteries. One NiMH
or 2s/3s LiPo battery equipped with a Traxxas High-Current Connector
is required. Traxxas Power Cell iD batteries are strongly recommended
for maximum performance and safer charging. The following chart lists
all the available Power Cell batteries for your model:

LiPo Batteries with iD

2849X 4000mAh 11.1v 3-Cell 25C LiPo Battery

2872X 5000mAh 11.1V 3-Cell 25C LiPo Battery

2843X 5800mAh 7.4V 2-Cell 25C LiPo Battery

2869X 7600mAh 7.4V 2-Cell 25C LiPo Battery

NiMH Batteries with iD

2923X Battery, Power Cell, 3000mAh (NiMH, 7-C flat, 8.4V)

2940X Battery, Series 3 Power Cell, 3300mAh (NiMH, 7-C flat, 8.4V)

2950X Battery, Series 4 Power Cell, 4200mAh (NiMH, 7-C flat, 8.4V)

2960X Battery, Series 5 Power Cell, 5000mAh (NiMH, 7-C flat, 8.4V)

WARNING: FIRE HAZARD!

Users of Lithium Polymer (LiPo) batteries must read the

Warnings and Precautions beginning on page 4. You
MUST use a LiPo charger for LiPo batteries or battery damage
with the potential for fire will result.

Make certain you choose the correct type of charger for the batteries
you select. Traxxas recommends you choose a genuine Traxxas
EZ-Peak iD charger for safer charging and maximum battery life and
performance.

Charger

EZ-Peak Plus,
4- am p

EZ-Peak Live,
12- a mp

EZ-Peak Dual,
8- amp

Part

No.

2 9 7 0 Y ES YES YES 3s

2 9 7 1 Y ES YES YES 4s

2 9 7 2 Y ES YES YES 3s

NiMH

Compatible

LiPo

Compatible

Battery iDMax.

Cells

If the status LED doesn’t light
green, check the polarity
of the batteries. Check
rechargeable batteries for
a full charge. If you see any
other flashing signal from the
LED, refer to the chart on page
32 to identify the code.

Use the Right Batteries

Your transmitter uses
AA batteries. Use new
alkaline batteries. Do
not use rechargeable AA
cells to power the TQi
transmitter, as they will not
provide sufficient voltage
for optimum transmitter
performance.

Caution: Discontinue running
your model at the first sign of
weak batteries (flashing red
light) to avoid losing control.

2,3

TRX-4 • 13

TRAXXAS TQi RADIO SYSTEM

Battery iD

Traxxas recommended
battery packs are equipped
with Traxxas Battery iD. This
exclusive feature allows
Traxxas battery chargers (sold
separately) to automatically
recognize connected battery
packs and optimize the
charge settings for the
battery. This eliminates
the need to worry over
charger settings and menus
for the easiest and safest
charging solution possible.
Visit Traxxas.com to learn
more about this feature and
available Traxxas iD chargers
and batteries.

INSTALLING THE BATTERY PACK

WARNING: Do not pinch the battery wires or connector between the
body wheel wells and the chassis when installing the battery.

Install the battery pack with the battery wires facing the rear of the
model. Swing the battery hold down towards the chassis and snap
(lock) the end into the front hold-down retainer.

Note: The battery hold down can be rotated on its pivot to
accommodate different height battery packs.

INSTALLING THE BODY

To secure the TRX-4 Tactical Unit body to the frame to prevent body
shake and provide support for the spare tire and accessories in the rear,
align the body with the rear bumper and rock sliders as shown below.

The Traxxas High-Current Connector

Your model is equipped with the Traxxas High-

Current Connector. Standard connectors restrict
current flow and are not capable of delivering
the power needed to maximize the output of
the XL-5 HV. The Traxxas connector’s gold-plated terminals with large
contact surfaces ensure positive current flow with the least amount of
resistance. Secure, long-lasting, and easy to grip, the Traxxas connector is
engineered to extract all the power your battery has to give.

14 • TRX-4

1

2

3

4

TRAXXAS TQi RADIO SYSTEM

RADIO SYSTEM CONTROLS

T

U

R

N

R

I

G

H

T

T

U

R

N

L

E

F

T

High Gear

Low Gear

Neutral
(full brake in
Crawl Mode)

Brake/R

(Immediate Reverse

in Crawl Mode)

RADIO SYSTEM RULES

•

Always turn your TQi transmitter on first and off last. This procedure
will help to prevent your model from receiving stray signals from
another transmitter, or other source, and running out of control. Your
model has electronic fail-safes to prevent this type of malfunction, but
the first, best defense against a runaway model is to always turn the
transmitter on first and off last.

1

2

3

Unlock
Diffs

Lock
Front
Diff

Lock
Both
Diffs

everse

Forward

• In order for the transmitter and receiver to bind to one another,
the receiver in the model must be turned on within 20 seconds
of turning on the transmitter. The transmitter LED will flash fast
red, indicating a failure to link. If you miss it, simply turn off the
transmitter and start over.

• Always turn on the transmitter before plugging in the battery.

RADIO SYSTEM BASIC ADJUSTMENTS

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 reverse.

70/30: Allows more throttle travel (70%) and less reverse travel (30%).

Note: We strongly recommend to leave this control in its factory
location until you become familiar with all the adjustments and
capabilities of your model. To change the throttle neutral adjust position,
turn the transmitter off before adjusting the neutral position. You will
need to reprogram your electronic speed control to recognize the
70/30 setting.

Setup Programming on page 18 for instructions.

Steering Trim

Turn the steering trim knob to precisely set
the steering neutral point. To adjust, drive
the vehicle forward slowly while “steering”
with the trim knob until the vehicle travels
in a straight line with no steering input.

Multi-Function Knob

The Multi-Function knob can be programmed to control a variety of
functions. From the factory, the Multi-Function knob controls Cruise
Control on the TRX-4. For more detail on the cruise control, refer to
page 17.

The default 50/50 setting is recommended.

Turn to XL-5 HV

Remember, always turn the
TQi transmitter on first and
off last to avoid damage to
your model.

Stop immediately at the first
sign of weak batteries. Never
turn the transmitter off when
the battery pack is plugged
in. The model could run out
of control.

Always turn your

transmitter on first.

Plug in the battery.

Turn on the model.

• Always use new batteries for the radio system. 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 model.

5

TRX-4 • 15

TRAXXAS TQi RADIO SYSTEM

Automatic Fail-Safe

The TQi transmitter and
receiver are equipped with
an automatic fail-safe system
that does not require user
programming. In the event of
signal loss or interference, the
throttle will return to neutral
and the steering will hold its
last commanded position. If
the fail-safe activates while
you are operating your model,
determine the reason for
signal loss and resolve the
problem before operating
your model again.

In order to re-acquire the
signal after the fail-safe has
activated, you will need
to walk a longer distance
closer to the model than the
distance the model travelled
out of range. Simply keep
walking towards the model
until you re-acquire the signal.

USING THE RADIO SYSTEM

The TQi Radio System has been pre-adjusted at the factory. The
adjustment should be checked before running the model in case of
movement during shipping. Here’s how:

1. Turn the transmitter switch on. The status LED on the transmitter
should be solid green (not flashing).

2. Elevate the model on a block or a stand so that all the tires are
off the ground. Make sure your hands are clear of the moving
parts of the model.

3. Plug the battery pack in the model into the speed control.

4. Press and release the EZ-Set button on the speed control to
turn the model on. The speed control’s LED will glow green,
indicating that Low-Voltage Detection is activated to prevent
over-discharging of LiPo batteries (this may cause poor
performance from NiMH battery packs). Never use LiPo batteries
while Low-Voltage Detection is disabled. See page 18 for more
information. To turn the speed control off, press the EZ-Set
button until the LED turns off.

5. 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, check for weak batteries.

6. When looking down at the 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.

7. Gently operate the throttle trigger to ensure that you have
forward and reverse operation, and that the motor stops when
the throttle trigger is at neutral. WARNING: Do not apply full

throttle in forward or reverse while the model is elevated.

8. Once adjustments are made, turn off the receiver on your model,
followed by the hand-held transmitter.

Range-Testing the Radio System

Before each running session with your model, 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.

2.

Have a friend hold the model. Make sure hands and clothing are

clear of the wheels and other moving parts on the model.

3.

Walk away from the model with the transmitter until you reach

the farthest distance you plan to operate the model.

4.

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

the model responds correctly.

5.

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.

Your model’s radio system is designed to operate reliably up to the
approximate distance that it is no longer easy or comfortable to see
and control the model. Most drivers will struggle to see and drive
their model at distances farther than a football field (300+ feet). At
greater distances, you could lose sight of your model and you may
also exceed the radio system’s operating range, which will cause
the failsafe system to activate. For best visibility and control of your
model, keep your model within 200 feet, regardless of the maximum
range available.

No matter how far you drive your model, always leave adequate space
between you, the model, and others. Never drive directly toward
yourself or others.

16 • TRX-4

6,7

TRAXXAS TQi RADIO SYSTEM

TQi Binding Instructions

For proper operation, the transmitter and receiver must be
electronically “bound.” This has been done for you at the factory.
Should you ever need to re-bind the system or bind to another
transmitter or receiver, follow these instructions. Note: The receiver

must be connected to a 4.8-6.0v (nominal) power source for binding.
Vehicles equipped with an electronic speed control contain a BEC
that provides a lower voltage to power the receiver (see page 11). The
transmitter and receiver must be within 5 feet of each other.

1. Press and hold the transmitter’s SET button as you switch the
transmitter on. The transmitter’s LED will flash red slowly. Release
the SET button.

2. Press and hold the receiver’s LINK button as you switch on
the speed control (by pressing the EZ-Set button). Release the
LINK button.

3. When the transmitter and receiver’s LEDs turn solid green, the
system is bound and ready for use. Confirm that the steering and
throttle operate properly before driving your model.

Cruise Control

The Multi-Function Knob on the TQi transmitter has been programmed
to control Cruise Control on the TRX-4, which maintains vehicle speed
for more comfortable long-distance travel (such as hiking on trails).

To operate Cruise Control,
accelerate to your desired
speed and press the SET
button on the transmitter
to lock the speed in. Your
model will continue at the
set speed until you apply
the brakes.

You can fine tune the
speed to exactly match
your pace by adjusting the
multi-function knob on the
transmitter. Turn the knob
clockwise to increase speed,
counterclockwise to reduce

Decrease

speed

Increase

speed

speed. You can accelerate
and drive faster with the
Cruise Control set, and the
vehicle will resume the set
speed when the throttle is
released (Resume function).

SETTING UP THE ANTENNA

The receiver antenna has been
set up and installed from the
factory. The antenna is secured
by a 3x4mm set screw. To
remove the antenna tube, simply
remove the set screw with the
included 1.5mm wrench.

When reinstalling the antenna,
first slide the antenna wire into
the bottom of the antenna tube
until the white tip of the antenna
is at the top of the tube under
the black cap. Next, insert the
antenna tube into the mount
while making sure that the
antenna wire is in the slot in the
antenna mount; then, install the set screw next to the antenna tube.
Use the supplied 1.5mm wrench to tighten the screw just until the
antenna tube is securely in place. Do not over tighten. Do not bend

or kink the antenna wire! See the side bar for more information.
Do not shorten the antenna tube.

Antenna

Tip

Antenna

Tube

Antenna

Mount

To prevent loss of radio range
do not kink or cut the black wire,
do not bend or cut the metal tip,
and do not bend or cut the white
wire at the end of the metal tip.

Correct

NoNo No

TRX-4 • 17

ADJUSTING THE ELECTRONIC SPEED CONTROL

XL-5 HV Specifications

Input Voltage

6-7 cells NiMH; 2s/3s LiPo

Case Size

1.23"W x 2.18"L x 1.11"H

Weight

2.6 ounces / 74 grams

Motor Limit

12-turns (550 size) with 2s LiPo
21-turns (550 Size) with 3s LiPo

On Resistance Forward

0.004 Ohms

On Resistance Reverse

0.004 Ohms

Peak Current - Forward

100A

Peak Current - Reverse

60A

Braking Current

60A

Continuous Current

18A

BEC Voltage

6.0 VDC

BEC Current

1A

Power Wire

14 Gauge / 5"

Input Harness Wire

26 Gauge / 14.5"

Transistor Type

MOSFET

PWM Frequency

1700 Hz

Thermal Protection

Thermal Shutdown

Single Button Setup

Yes

Low-Voltage Detection

Yes (User Enabled)

18 • TRX-4

XL-5 HV Battery Settings (Low-Voltage Detection Setting)

The XL-5 HV electronic speed control is equipped with built-in Low­Voltage Detection. The Low-Voltage Detection circuitry constantly
monitors the battery voltage. When the battery voltage begins to
reach the minimum recommended discharge voltage threshold
for LiPo battery packs, the XL-5 HV will limit the power output to
50% throttle. When the battery voltage attempts to fall below the
minimum threshold, the XL-5 HV will shut down all motor output.
The LED on the speed control will slowly blink red, indicating a low­voltage shutdown. The XL-5 HV will stay in this mode until a fully
charged battery is connected.

When you turn your model on, the XL-5 HV speed control’s status
LED will glow green, indicating that Low-Voltage Detection is

activated to prevent over-discharging of LiPo batteries. LiPo
batteries are intended only for the most advanced users that are
educated on the risks associated with LiPo battery use.

WARNING: FIRE HAZARD!

Do not use LiPo batteries in this vehicle with
Low-Voltage Detection disabled.

Verify that Low-Voltage Detection is ACTIVATED:

1. Turn on the transmitter (with the throttle at neutral).

2. Connect a fully charged battery pack to the XL-5 HV.

3. Press and release the EZ-Set button to turn the XL-5 HV on. If the
LED is solid green, then the Low-Voltage Detection is ACTIVATED.

If Low-Voltage Detection is DISABLED:

1. Make sure the LED on the XL-5 HV is on and RED.

2. Press and hold the EZ-Set button (the
LED will turn off). After ten seconds, the
motor will beep twice and the LED will
shine GREEN. Release the button.

3. Low-Voltage Detection is now ACTIVATED.

For NiMH battery users, follow these steps to disable Low-Voltage
Detection (NiMH setting):

1. Make sure the LED on the XL-5 HV is on and GREEN.

2. Press and hold the EZ-Set button (the
LED will turn off). After ten seconds, the
motor will beep three times and the
LED will shine RED. Release the button.

3. Low-Voltage Detection is now DISABLED.

XL-5 HV Setup Programming (Calibrating your ESC and transmitter)
Read through all of the programming steps before you begin. If you
get lost during programming or receive unexpected results, simply
unplug the battery, wait a few seconds, plug the battery pack in, and
start over.

A

1. Disconnect one of the motor wires between the

XL-5 HV and the motor. This is a precaution to
prevent runaway when the speed control is turned
on before it is programmed.

2. Connect a fully charged battery pack

B

Green then Red

to the XL-5 HV.

3. Turn on the transmitter (with the

throttle at neutral).

4. Press and hold the EZ-Set button (A).

Once Red

C

The LED will first turn green and then
red. Release the button.

5. When the LED blinks RED ONCE, pull

the throttle trigger to the full throttle
position and hold it there (B).

Twice Red

D

6. When the LED blinks RED TWICE, push the

throttle trigger to the full reverse and hold it
there (C).

Solid

Note: If you are calibrating to clear an error code on the ESC, then
skip step 7 and proceed to step 8.

7. When the LED blinks GREEN ONCE, programming is complete.

The LED will then shine green or red (depending on Low­Voltage Detection setting).

8. When the LED blinks GREEN ONCE, continue holding the trigger

in the reverse position and also press and hold the button on
the ESC for about 10 seconds until the ESC beeps. This places
the ESC in NiMH mode and clears any error codes.

XL-5 HV Operation

To operate the speed control and test the programming, reconnect
the motor wires and place the vehicle on a stable block or stand so
that all of the driven wheels are off the ground.

Note that in steps 1-8 below, Low-Voltage Detection is ACTIVATED
(factory default) and the LED shines green. If Low-Voltage Detection is
DISABLED, the LED will shine red instead of green in steps 1-8 below.

1. With the transmitter on, press and release the EZ-Set button. The

LED will shine GREEN. This turns the XL-5 HV on. If you press and

ADJUSTING THE ELECTRONIC SPEED CONTROL

release too quickly, you may hear the steering servo jump but the
LED may not stay on. Simply press the button again until the LED
shines GREEN, and then release.

2. Apply forward throttle. The LED will turn off until full throttle power
is reached. At full throttle, the LED will shine GREEN.

3. Move the trigger forward to apply the brakes. Note that braking
control is fully proportional. The LED will turn off until full braking
power is reached. At full brakes, the LED will shine GREEN.

4. Return the throttle trigger to neutral. The LED will shine GREEN.

5. Move the throttle trigger forward again to engage reverse (Profile
#1). The LED will turn off. Once full reverse power is reached, the
LED will shine GREEN.

6. To stop, return the throttle trigger to neutral. Note that there is
no programmed delay when changing from reverse to forward.
Use caution to avoid slamming the speed control from reverse to
forward. On high-traction surfaces, this could result in transmission
or driveline damage.

7. To turn the XL-5 HV off, press and hold the EZ-Set button for 1½
seconds or until the green LED turns off.

8. The XL-5 HV is equipped with thermal shutdown protection to
guard against overheating caused by excessive current flow. If
the operating temperature exceeds safe limits, the XL-5 HV will
automatically shut down. The LED on the face of the XL-5 HV will
rapidly blink red, even if the throttle trigger is moved back and
forth. Once the temperature returns to a safe level, the XL-5 HV will
once again function normally.

XL-5 HV Profile Selection

The speed control is factory set to Trail Mode (100% forward, brakes,
and reverse; added brake drag when the throttle trigger is at neutral).
To activate full power without the additional brake drag (Sport Mode),
disable reverse (Race Mode), allow 50% power (patented Training
Mode), or set immediate reverse (Crawl Mode), follow these steps. The
speed control should be connected to the receiver and the transmitter
adjusted as described previously. The profiles are selected by entering
the programming mode.

Profile Description

Profile #1 (Sport Mode): 100% Forward, 100% Brakes, 100% Reverse
Profile #2 (Race Mode): 100% Forward, 100% Brakes, No Reverse
Profile #3 (Training Mode): 50% Forward, 100% Brakes, 50% Reverse
Profile #4 (Trail Mode): 100% Forward, 100% Brakes, 100% Reverse;

Drag Brake at Neutral

Profile #5 (Crawl Mode): 100% Forward, Hill Hold Brakes at Neutral,

Immediate Reverse

Selecting Sport Mode

(Profile #1: 100% Forward, 100% Brakes, 100% Reverse)

1. Connect a fully charged battery pack to

A

B

the XL-5 HV and turn on your transmitter.

2. With the XL-5 HV off, press and hold
the EZ-Set button until the LED turns
solid green, then solid red and then
begins blinking red (indicating the

Green to Red to Off

C

One blink Red

D

Profile numbers).

3. When the LED blinks RED ONCE, release
the EZ-Set button.

Release

Solid

4. The LED will blink and then turn solid green (Low-Voltage Detection
ACTIVE) or red (Low-Voltage Detection DISABLED). The model is
ready to drive.

Selecting Race Mode
(Profile #2: 100% Forward, 100% Brakes, No Reverse)

1. Connect a fully charged battery pack to

A

B

the XL-5 HV and turn on your transmitter.

2. With the XL-5 HV off, press and hold
the EZ-Set button until the LED turns
solid green, then solid red and then
begins blinking red (indicating the Profile

Green to Red to Off

C

Two blinks Red

D

numbers).

3. When the LED blinks RED TWICE, release
the EZ-Set button.

Release

Solid

4. The LED will blink and then turn solid green (Low-Voltage Detection
ACTIVE) or red (Low-Voltage Detection DISABLED). The model is
ready to drive.

Selecting Training Mode
(Profile #3: 50% Forward, 100% Brakes, 50% Reverse)

1. Connect a fully charged battery pack to

A

B

the XL-5 and turn on your transmitter.

2. With the XL-5 off, press and hold the
EZ-Set button until the LED turns solid
green, then solid red and then begins
blinking red (indicating the Profile

Green to Red to Off

C

Three blinks Red

D

numbers).

3. When the LED blinks RED THREE
TIMES, release the EZ-Set button.

Release

Solid

4. The LED will blink and then turn solid green (Low-Voltage Detection
ACTIVE) or red (Low-Voltage Detection DISABLED).
The model is ready to drive.

Patented Training Mode
(Profile #3) reduces forward
and reverse throttle by 50%.
Training Mode is provided
to reduce the power output,
allowing beginning drivers to
better control the model. As
driving skills improve, simply
change to Sport, Race, Trail,
or Crawl Mode for full-power
operation.

Tip For Fast Mode Changes

The XL-5 HV is set to Profile 4
(Trail Mode) as the default.
To quickly change to Profile 3
(Training Mode), with the
transmitter on, press and hold
the EZ-Set button until the light
blinks red three times and then
release. Quickly change back to
Profile 4 (Trail Mode) by pressing
and holding the EZ-Set button
until the light blinks red four
times and then releasing.

TRX-4 • 19

ADJUSTING THE ELECTRONIC SPEED CONTROL

Throttle Neutral Protection

The XL-5 HV speed control
features Throttle Neutral
Protection, which prevents
the model from suddenly
accelerating if the speed
control is switched on while
the transmitter’s trigger is
being held. When the trigger is
returned to neutral, the XL-5 HV
will operate properly.

Selecting Trail Mode

(Profile #4: 100% Forward, 100% Brakes, 100% Reverse;
Drag Brake at Neutral)

A

B

1. Connect a fully charged battery pack
to the XL-5 HV and turn on your
transmitter.

2. With the XL-5 HV off, press and hold
the EZ-Set button until the LED turns

Green to Red to Off

C

Four blinks Red

D

solid green, then solid red and then
begins blinking red (indicating the
Profile numbers).

Release

Solid

3. When the LED blinks RED FOUR TIMES, release the EZ-Set button.

4. The LED will blink and then turn solid green (Low-Voltage
Detection ACTIVE) or red (Low-Voltage Detection DISABLED). The
model is ready to drive.

Selecting Crawl Mode

(Profile #5: 100% Forward, Hill Hold Brakes at Neutral, Immediate
Reverse)

A

B

1. Connect a fully charged battery pack
to the XL-5 HV and turn on your
transmitter.

2. With the XL-5 HV off, press and hold
the EZ-Set button until the LED turns

Green to Red to Off

C

Five blinks Red

D

solid green, then solid red and then
begins blinking red (indicating the
Profile numbers).

Release

Solid

3. When the LED blinks RED FIVE TIMES, release the EZ-Set button.

4. The LED will blink and then turn solid green (Low-Voltage
Detection ACTIVE) or red (Low-Voltage Detection DISABLED). The
model is ready to drive.

Note: If you missed the mode you wanted, keep the EZ-Set button
pressed down and the blink cycle will repeat until the button is
released and a Mode is selected.

LED Codes and Protection Modes

• Solid Green: XL-5 HV power-on light. Low-
Voltage Detection is ACTIVATED (LiPo setting).

WARNING: FIRE HAZARD!

Do not use LiPo batteries in this vehicle with
Low-Voltage Detection disabled.

• Fast Blinking Red: Overtemp. The XL-5 HV is
equipped with thermal shutdown protection to
guard against overheating caused by excessive
current flow. If the operating temperature exceeds
safe limits, the XL-5 HV will automatically shut down. Let the XL-5
HV cool before continuing. The ESC can get too hot in situations
such as climbing and crawling in high gear, which increases load
on the system. Use low gear for climbing and crawling.

• Slow Blinking Red (when Low-Voltage
Detection is activated): The XL-5 HV has
entered Low-Voltage Protection. When the
battery voltage begins to reach the minimum
recommended discharge voltage threshold for LiPo battery
packs, the XL-5 HV will limit the power output to 50% throttle.
When the battery voltage attempts to fall below the minimum
threshold, the XL-5 HV will shut down all motor output. The
LED on the speed control will slowly blink red, indicating a low­voltage shutdown. The XL-5 HV will stay in this mode until a fully
charged battery is connected.
battery was connected to an ESC with Low-Voltage Detection
turned on, then follow the calibration steps from the previous
page to release the code and change the ESC to NiMH mode.

• Fast Blinking Red and Green

This code can appear when a fully charged
NiMH battery is connected to the XL-5 HV ESC
with Low-Voltage Detection turned on. Follow
the calibration steps from the previous page to
release the code and change the ESC to NiMH mode.

• Fast Blinking Green: The XL-5 HV’s LED will blink
fast green if the speed control is not receiving a
signal. Make certain the speed control is properly
plugged into the receiver and the transmitter is
switched on.

If you see this code because a NiMH

: Overvoltage.

20 • TRX-4

• Solid Red: XL-5 HV power-on light. Low-Voltage
Detection is DISABLED (NiMH setting).

DRIVING YOUR MODEL

Now it’s time to have some fun! This section contains instructions on
driving and making adjustments to your model. Before you go on, here
are some important precautions to keep in mind.

•

Allow the model to cool for a few minutes between runs. This is
particularly important when using high-capacity battery packs that
allow extended periods of running. Monitoring temperatures will
extend the lives of the batteries and motor.

•

Do not continue to operate the model with low batteries or you
could lose control of it. Indications of low battery power include
slow operation and sluggish servos (slow to return to center). Stop
immediately at the first sign of weak batteries. When the batteries in
the transmitter become weak, the red power light will begin to flash.
Stop immediately and install new batteries.

•

Do not drive the model at night, on public streets, or in large crowds
of people.

• Drive the TRX-4 primarily in low gear for maximum torque. High
gear can be used for high-speed running on open trails or when
clearing steep slopes or gaps in rocks. Driving in high gear for
extended periods of time can result in the motor and/or ESC
overheating and premature motor wear.

•

If the model becomes stuck against an object, do not continue to run
the motor. Remove the obstruction before continuing. Do not push or
pull objects with the model.

• If an obstacle cannot be cleared by slow crawling, slowly increase
the vehicle speed as you drive toward the obstacle to allow the
suspension links and skiplates of the TRX-4 to slide over it.

•

Because the model is controlled by radio, it is subject to radio interference
from many sources beyond your control. Since radio interference can
cause momentary losses of control, allow a safety margin of space in all
directions around the model in order to prevent collisions.

•

Use good, common sense whenever you are driving your model.
Intentionally driving in an abusive and rough manner will only result
in poor performance and broken parts. Take care of your model so
that you can enjoy it for a long time to come.

•

High-performance vehicles produce small vibrations that may loosen
hardware over time. Frequently check wheel nuts and other screws on
your vehicle to ensure that all hardware remains properly tightened.

Operating the High-Low Transmission

TRX-4’s High-Low transmission is operated via the red
rocker switch above the transmitter grip; depressing
the upper part of the switch engages Low, depressing
the lower part of the switch engages High. TRX-4 may
be shifted from low gear into high gear at any speed.
For smoother operation, reduce the speed of the model
before shifting from high gear into low gear. This will
reduce strain on the transmission gears. Although TRX­4’s Titan 550 motor has ample torque for climbing and
crawling in second gear, using first gear in situations that
require low speed will extend motor life.

Operating the T-Lock Differentials

The switch on top of the transmitter operates the
front and rear differential locking mechanism. The
differentials can be locked or unlocked at any time
during most driving conditions.
and there is wheelspin on a single wheel (one side
of an unlocked differential is freewheeling), then
release the throttle and allow the wheels to stop
before locking the differential.

For most driving, the TRX-4 will perform best with both differentials
unlocked or “open” (T-Lock switch back). This will give TRX-4 maximum
steering performance and the tightest possible turning radius, and will
also reduce strain on the drive components. If open differentials cause
you to lose traction over loose terrain or when traversing an obstacle,
you can use the T-Lock switch to lock the front differential or both
differentials. Lock the front differential for enhanced climbing ability
and traction by moving the T-Lock switch to the middle position.
Apply throttle slowly until the T-Lock engages (it will take just a
moment), then use the throttle as needed. Lock both differentials for
maximum climbing ability and traction by moving the T-Lock switch
to the forward-most position. As with a full-size 4WD vehicle, TRX-4’s
high-speed handling and steering precision are reduced when one or
both differentials are locked. Locked differentials can be used at any
time, but unlocking the differentials greatly improves vehicle handling
during high-speed driving.

If the model is stuck

9

TRX-4 • 21

DRIVING YOUR MODEL

22 • TRX-4

About Run Time

A large factor affecting run time is the type and condition of
your batteries. The milliamp hour (mAh) rating of the batteries
determines how large their “fuel tank” is. A 3000 mAh battery
pack will theoretically run twice as long as a 1500 mAh sport pack.
Because of the wide variation in the types of batteries that are
available and the methods with which they can be charged, it’s
impossible to give exact run times for the model. Another major
factor that affects run time is how the model is driven. Run times
may decrease when the model is driven repetitively from a stop to
top speed and with repetitive hard acceleration.

Tips for Increasing Run Time

•

Use batteries with the highest mAh rating you can purchase.

•

Use a high-quality peak-detecting charger.

•

Read and follow all maintenance and care instructions provided by
the manufacturer of your batteries and charger.

• Keep the XL-5 HV cool.
sink.

•

Lower your gear ratio. Installing a smaller pinion gear will lower your
gear ratio and cause less power draw from the motor and batteries,
and reduce overall operating temperatures.

•

Maintain your model. Do not allow dirt or damaged parts to cause
binding in the drivetrain. Keep the motor clean.

mAh Ratings and Power Output

The mAh rating of the battery can affect your top-speed performance.
The higher capacity battery packs experience less voltage drop under
heavy load than low mAh rated packs. The higher voltage potential
allows increased speed until the battery begins to become discharged.

Get plenty of airflow across the ESC heat

RUNNING IN WET CONDITIONS

Your new Traxxas TRX-4 is designed with water-resistant features
to protect the electronics in the model (receiver, servos, electronic
speed control). This gives you the freedom to have fun driving your
TRX-4 through puddles, wet grass, snow, and through other wet
conditions. Though highly water resistant, the TRX-4 should not be
treated as though it is submersible or totally 100% waterproof. Water
resistance applies only to the installed electronic components. Running
in wet conditions requires additional care and maintenance for the
mechanical and electrical components to prevent corrosion of metal
parts and maintain their proper function.

Precautions

•

Without proper care, some parts of your model can be seriously
damaged due to contact with water. Know that additional
maintenance procedures will be required after running in wet
conditions in order to maintain the performance of your model.
Do not run your model in wet conditions if you are not willing to
accept the additional care and maintenance responsibilities.

•

Not all batteries can be used in wet environments. Consult your
battery manufacturer to see if their batteries can be used in wet
conditions. Do not use LiPo batteries in wet conditions.

•

The transmitter is not water resistant. Do not subject it to wet
conditions, such as rain.

•

Do not operate your model during a rain storm or other inclement
weather where lightning may be present.

•

Do not allow your model to come in contact with saltwater (ocean
water), brackish water (between fresh water and ocean water), or
other contaminated water. Saltwater is highly conductive and highly
corrosive. Use caution if you plan to run your model on or near a beach.

•

Even casual water contact can reduce the life of your motor. Special
care must be taken to modify your driving style in wet conditions to
extend the life of the motor (details below).

Before Running Your Vehicle in Wet Conditions

1.

Consult the section “After Running Your Vehicle in Wet Conditions”
before proceeding. Make sure you understand the additional
maintenance required with wet running.

2.

The wheels have small holes molded in to allow air to enter and exit
the tire during normal running. Water will enter these holes and
get trapped inside the tires.
(including the spare) with adhesive tape to prevent possible
damage to the foam inserts

3.

Confirm that the receiver box O-ring and cover are installed correctly
and secure. Make sure the screws are tight and the blue o-ring is not
visibly protruding from the edge of the cover. Confirm that the wire
clamp has sufficient grease.

4.

Confirm that your batteries can be used in wet conditions.

5.

Use low gear when running in mud, deep puddles, snow, or similar
situations that will restrict the tires and put much higher loads on the
motor. Although the TRX-4’s Titan 550 motor has ample torque in
second gear, using first gear in situations that require low speed will
extend motor life. Limit second-gear use to high-speed running on dry
ground.

Cover the breather holes in all tires

.

DRIVING YOUR MODEL

Motor Precautions

•

Titan 550 motor life can be greatly reduced in mud and water. If the
motor gets excessively wet or submerged, use very light throttle (run
the motor slowly) until the excess water can run out. Applying full
throttle to a motor full of water can cause rapid motor failure. Your
driving habits will determine motor life with a wet motor. Do not
submerge the motor under water.

•

Do not gear the motor by temperature when running in wet
conditions. The motor will be cooled by water contact and will not
give an accurate indication of appropriate gearing.

After Running Your Vehicle in Wet Conditions

1. Remove the batteries.

2. Rinse excess dirt and mud off the truck with low-pressure water, such
as from a garden hose. Do not use a pressure washer or other high­pressure water. Avoid directing water into the bearings, transmission,
differentials, etc.

3. Blow off the truck with compressed air (optional, but recommended).
Wear safety glasses when using compressed air.

4. Remove the wheels from the truck.

5. Spray all the bearings, drivetrain, and fasteners with WD-40® or
similar water-displacing light oil.

6. Let the truck stand or you may blow off with compressed air. Placing
the truck in a warm, sunny spot will aid drying. Trapped water and oil
will continue to drip from the truck for a few hours. Place it on a towel
or piece of cardboard to protect the surface underneath.

7. As a precautionary step, remove the sealed receiver box cover. While
unlikely, humidity or tiny amounts of moisture or condensation may
enter the receiver box during wet running. This can cause long-term
problems with the sensitive electronics in the receiver. Removing
the receiver box cover during storage allows the air inside to dry. This
step can improve the long-term reliability of the receiver. It is not
necessary to remove the receiver or unplug any of the wires.

8. Additional Maintenance: Increase your frequency of disassembly,
inspection, and lubrication of the following items. This is necessary
after extended wet use or if the vehicle will not be used for an
extended period of time (such as a week or longer). This additional
maintenance is needed to prevent any trapped moisture from
corroding internal steel components.

• Portal gearboxes: Open, dry, clean, and re-grease the
gears and inspect for damage.

• Front and rear differential: Remove the differential
covers to disassemble, clean, and re-grease the ring and
pinion gears. Refer to your exploded view diagrams for
help with disassembly and reassembly.

• Transmission: Remove, disassemble, clean, and
re-grease the transmission components. Use a light
coating of high-performance grease (such as Traxxas
part #5041) on the metal gear teeth. No grease is required for the
nylon gears. Refer to your exploded view diagrams for help with
disassembly and reassembly.

• Titan 550 motor: Remove the motor, clean with aerosol motor
cleaner, and re-oil the bushings with lightweight motor oil. Be sure
to wear eye protection when using spray aerosol cleaners.

TRX-4 • 23

DRIVING YOUR MODEL

RECEIVER BOX: MAINTAINING A

WATERTIGHT SEAL

Removing and Installing Radio Gear

The unique design of the receiver box allows the removal and
installation of the receiver without losing the ability to maintain a
watertight seal in the box. The patent-pending wire clamp feature
gives you the ability to also install aftermarket radio systems and
maintain the watertight features of the receiver box.

Removing the Receiver

1. To remove the cover, remove the three 3x8mm button-head cap
screws.

2. To remove the receiver from the box, carefully pull it out (it is
secured by double-sided adhesive foam tape) and set to the side.
The antenna wire is still inside the clamp area and cannot be
removed yet.

3. Remove the wire clamp by removing the two 2.5x8mm cap
screws.

4. Unplug the servo cables from the receiver and remove the
receiver.

Receiver Installation

1. Always install the wires into the box before installing the receiver.

2. Install the antenna wire and the servo cables into the receiver box.

3. Arrange the wires neatly using the wire guides in the receiver box.
The excess wire will be bundled inside the receiver box. Label
which wire is for which channel.

5. Install the wire clamp and
tighten the two 2.5x8mm cap
screws securely.

6.

Using double-sided adhesive
foam tape, install the receiver
into the box.

Note: For best performance, it is
recommended that the receiver
be installed in the original orientation.

7. Plug the wires into receiver. Refer to page 12 for the wiring

diagram.

8. Make sure the clear plastic light pipe in the receiver box is aligned
above the LED on the receiver.

9. Make sure the o-ring is properly seated into the groove in the
receiver box so that the cover will not pinch it or damage it in any
way.

10. Install the cover and tighten the three 3x8mm button-head cap
screws securely.

11. Inspect the cover to make sure that the o-ring seal is not visible.

24 • TRX-4

4. Apply a bead of silicone grease
(Traxxas part #1647) to the wire clamp.

TUNING ADJUSTMENTS

Adjustment procedures for alignment, spring rate, damping, steering,
and ride height are covered here.

SUSPENSION TUNING

Springs

TRX-4’s front spring (0.45 rate, no stripe) and rear spring (0.54 rate,
green stripe) have been carefully selected to provide full suspension
articulation and support for the weight of the vehicle body.

Using different bodies with lighter weight will allow you to use lower
rate springs to increase traction and suspension articulation when
traversing difficult terrain. Lighter springs can be used since the portal
axles use gear reduction right at the wheels to reduce undesirable
torque twist.

Ride Height Adjustment

TRX-4’s ride height can be finely tuned by adjusting suspension sag
via the preload adjusters on the shock bodies. Thread the preload
adjuster down the shock body to raise TRX-4’s ride height, or thread
the adjuster up the shock body to lower ride height. The front left
preload adjuster will require more threading to compensate for
the weight of the motor. If threading the preload adjusters to the
maximum ride height position still allows more suspension sag than
you prefer, stiffer springs should be installed.

SHOCK TUNING

Shock Oil

The 4 oil-filled aluminum shocks (dampers) effectively control the
suspension movement by preventing the wheels and tires from
continuing to “bounce” after rebounding from a bump. Changing the oil
in the shocks can vary the suspension damping effect. Changing the oil to
a higher viscosity oil will increase damping. Lowering the viscosity of the
oil will cause the suspension damping to be reduced.

Damping should be increased (with higher viscosity oil) if the model is
bottoming easily over jumps or when stiffer springs are installed. Damping
should be decreased (with thinner viscosity oil) if the model is hopping
over small bumps and feels unstable or when softer springs are installed.
The viscosity of shock oil is affected by extremes in operating temperature;
an oil of certain viscosity will become less viscous at higher temperatures
and more viscous at lower temperatures. Operating in regions with cold
temperatures may require lower viscosity oil. From the factory, the shocks
are filled with SAE-30W silicone oil. Only use 100% silicone oil in the shock.

Replacing Shock Oil

The shocks have to be removed from
the vehicle and disassembled
to change the oil.

1.

Remove the lower spring retainer

and shock spring.

2. Remove the upper shock cap.

3. Empty the used shock oil from the
shock body.

4. Compress the shock fully against
the stop on the lower spring
retainer (A).

5. Fill the shock with new silicone
shock oil up to the top of the shaft;
then, add 2-3 drops of oil to reach
the proper level (0.3mm above the
top of the shaft) (B).

6. Slowly move the piston up and
down to remove excess air. Add
oil if needed to maintain the
proper level.

Ensure the cavity in the upper shock

7.
cap (C) is dry and free of oil; screw
the shock cap onto the shock body.

8. Tighten the shock cap until snug.

Shock disassembly

The shocks must be removed from the vehicle prior to disassembly.
Use the shock exploded views included with the model to aid in the
assembly process.

1. Remove the spring and lower spring retainer from the shock.

2. Remove the shock cap and empty the shock body of shock oil.

3. Remove the lower cap, the X-rings, and spacer from the shock

body.

4. Use needlenose pliers or side cutters to grip the shock shaft just

above the rod end. Remove the rod end from the shock shaft.

5. Remove the shock shaft with piston from the shock body out

through the top of the shock body.

B

6.7mm

A

C

Important: The shocks are
assembled at the factory
with a center-to-center
distance (between the rod
end balls) of 90mm. Any time
the shocks are removed and
disassembled, this distance
should be checked to ensure
proper operation of the
suspension.

90mm

TRX-4 • 25

TUNING ADJUSTMENTS

Never slide the threads on
the shock rod past the X-ring
seals when it is installed and
compressed by the bottom
cap of the shock. Doing so will
damage the seal and cause
shock oil to leak.

Shock assembly

1. Insert the shock shaft assembly through the
shock body until the piston bottoms out.

2. Lubricate the shaft, O-ring, and X-rings with
silicone oil.

3. Install the O-ring, X-rings and spacer over

the shaft and into the bore of the shock
body.

4. Install the lower cap.

5. Grip the shaft close to the threads with

needlenose pliers or side cutters and
thread the rod end onto the shock shaft
until the rod end bottoms out.

6. Fill the shock with new silicone shock oil

(see the “Replacing Shock Oil” section on the
previous page).

7. Slowly thread the upper cap onto the

shock body.

8. Reinstall the spring and lower retainer.

transmission tuning

Adjusting the Slipper Clutch

The TRX-4 is equipped with an adjustable Torque Control slipper
clutch, which is built into the large spur gear. The purpose of the
slipper clutch is to protect the motor and drivetrain when the
drivetrain is bound while driving. The slipper clutch should not slip
during normal operation.

The slipper clutch is integrated
into the main spur gear on the
transmission. The slipper clutch
is adjusted using the locknut
on the slipper shaft. 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.

Loosen

Tighten

To restore factory settings, use
the included 4-way wrench
to turn the adjustment nut
until all four spring washers
are flat; then, tighten the nut
an additional 1/16 turn (or
until the slipper clutch does
not allow the spur gear to slip
during normal operation).

WHEELS AND TIRES

Many types of aftermarket tires and wheels can be adapted for
use on your model. Most will affect the overall width and the
suspension geometry of the model. The offsets and dimensions
designed into the model’s wheels are intentional; therefore,
Traxxas cannot recommend the use of other non-Traxxas wheels
with different specifications.

When selecting wheels, the inner
diameter of the inside of the
wheels must be 38mm or larger to
accommodate the axle portals. The
TRX-4’s stub axles are 6mm; this may
require drilling the center hole of
the wheel to increase the diameter
before it will fit. When selecting tires,
consider the terrain. Rocky surfaces
are better suited to soft compound
tires with a tight tread pattern. In loose dirt, harder compound tires
with a more open tread pattern should perform better. TRX-4’s 1.9
Canyon Trail tires are optimized for all driving surfaces.

Minimum Wheel
Inner Diameter

38mm

26 • TRX-4

TUNING ADJUSTMENTS

MOTORS AND GEARING

The TRX-4’s Titan™ 550 Motor has been carefully matched to the
needs of the TRX-4. The Titan 550 is made to run efficiently at high
voltage to provide more torque and longer run times. We do not
recommend converting the TRX-4 to a typical low-voltage setup
using traditional 540 size motors. While these components will
physically fit into the TRX-4, the system will not run as efficiently,
losing power in the form of motor and battery heating. The result
will be shorter run times, high current draw, and extreme battery
and motor temperatures.

The TRX-4 is equipped from the factory with a 45-tooth spur gear
and 11-tooth pinion gear. TRX-4 has a large range of gearing,
making it suitable for many different types of applications and
environments. If you want more acceleration and less top speed,
use a smaller pinion gear (fewer teeth, higher numerical ratio). The
overall reduction is the number of turns the motor makes for one
revolution of the tire. Higher numerical ratios provide more torque,
lower numerical ratios provide more top speed. With the Titan 550

motor, do not use a pinion gear larger than 12-tooth with the
stock 45-tooth spur gear. Use the following formulas to calculate

the overall ratio for combinations not listed on the gear chart:

To find High Gear :

# Spur Gear Teeth

# Pinion Gear Teeth

To find Low Gear :

# Spur Gear Teeth

# Pinion Gear Teeth

x 6.32 =

x 15.8 =

Final

Gear Ratio

Final

Gear Ratio

Gearing Compatibility Chart:

The charts below show a full range of gear combinations. This
does NOT imply that these gear combinations should be used.
Over-gearing (bigger pinions, smaller spurs) can overheat and
damage the motor and/or speed control.

High Gear Low Gear

Spur Gear

9

27.39 31.60

10

24.65 28.44

11

22.41 25.85

12

20.54 23.70

13

18.96 21.88

14

17.61 20.31

15

16.43 18.96

16

15.41 17.78

Pinion Gear

17

14.50 16.73

18

13.69 15.80

19

12.97 14.97

20

12.32 14.22

21

11.74 13.54

22

11.20 12.93

39 45

Spur Gear

9

68.47 79.00

10

61.62 71.10

11

56.02 64.64

12

51.35 59.25

13

47.40 54.69

14

44.01 50.79

15

41.08 47.40

16

17

18

19

20

21

22

38.51 44.44

36.25 41.82

34.23 39.50

32.43 37.42

30.81 35.55

29.34 33.86

28.01 32.32

Pinion Gear

39 45

Stock factory gearing

For 6- or 7-cell NiMH battery and 2s/3s LiPo battery

Does not fit

Not recommended for stock motor

TRX-4 • 27

TUNING ADJUSTMENTS

Screw Positions

Spur Gear

39 45

9

- A

10

- B

11

- C

12

- D

13

- E

14

- F

15

A G

16

Pinion Gear

B H

17

C -

18

D -

19

E -

20

F -

21

G -

22

H -

Stock factory gearing

Does not fit

Adjusting Gear Mesh

Incorrect gear mesh is the most
common cause of stripped spur
gears. Your model includes a fixed
gear positioning system to simplify
the process and ensure proper gear
mesh settings. Access the gears by
removing the three 3x8mm button-
head screws from the gear cover;
remove the gear cover. Remove the
motor/motor plate assembly from
the chassis.

To set the gear mesh, use the chart
to the left to identify the screw
positions on the motor plate (A - H)
that correspond with the chosen
motor pinion (9-T - 22-T) and spur gear size (39-T or 45-T). Remove
the two screws from the motor/motor plate and reinstall in the
corresponding positions; reinstall the motor/motor plate assembly
in the chassis.

Motor Removal/Installation

To access the motor, remove the gear cover by removing the three
3x8mm button-head cap screws. Remove the motor/motor plate
assembly from the chassis; then, remove the two screws holding
the motor to the motor plate. Installation of the motor is the
reverse of removal.

SERVO STEERING SYSTEM

TRX-4 uses a single metal gear servo for powerful, responsive steering.

Adjusting the Steering System

1. Remove the servo horn and steering links from the servo.

2. Adjust the drag link to 133.2mm; adjust the steering link to 77.3mm.

Drag Link

133.2mm

Steering Link

77.3mm

3. Switch on the power to the receiver and the transmitter.

4. Adjust the steering trim on the transmitter to the neutral “0” position.

5. Connect one end of a steering link to the steering servo arm and the
other end to the servo horn.

6. Position the servo horn perpendicular to the centerline of the vehicle
as shown below.

Front of

Truck

If you are using aftermarket servos, it is important to use servo horns
designed for TRX-4. The servo horns must measure 22mm from the
steering linkage mounting hole to the servo mounting hole.

28 • TRX-4

TUNING ADJUSTMENTS

T-LOCK SERVO INSTALLATION

The TRX-4’s T-Lock differential control servos are installed and pre-set
at the factory. If you need to remove the servos or the servo horns for
maintenance or cleaning, carefully note their orientation when you
reinstall them to make certain the T-Lock system operates properly.

Before reinstalling the spring-loaded servo horns, reset the servos’
output shafts to the “diffs open” position.

1. Switch the transmitter and receiver on and plug the T-Lock servos
into their correct positions on the receiver unit (see page 12).

2. Operate the transmitter’s T-Lock switch to make certain both servos
operate properly, then place the switch in the “open” position for
unlocked front and rear diffs (see page 21).

3. Install the servo horns as shown below. Switch the transmitter and
on-board electronics off before completing the installation.

Front Differential T-Lock Servo
Differential Open: Install the spring-

loaded servo horn so the spring slot is
perpendicular to the linkage as shown.

Differential Locked: Switch the
transmitter and receiver on. Move the
T-Lock switch to the middle position
to lock the front differential. Confirm
that the servo’s output shaft turns
counterclockwise to rotate the servo
horn to the position shown.

Open

Locked

Front of

Truck

Front of

Truck

FITTING AFTERMARKET BODIES

Rear Shock Tower

The rear shock tower can be installed in two different location and
in two orientations each. This is to allow precise angle adjustment
of the rear shocks. The shock cap hollow balls can also be replaced
with offset versions (part #5355, sold separately) to further fine
tune the shock angle.

Rear Body Mount

An additional rear body mount crossmember is included with your
model to allow the rear shock towers to be installed in the forward
position.

Rear Differential T-Lock

Servo

Differential Open: Install the spring-loaded

servo horn so the spring slot is parallel to
the linkage as shown.

Differential Locked: Switch the transmitter
and receiver on. Move the T-Lock switch to
the forward-most position to lock the rear
differential. Confirm that the servo’s output
shaft turns counterclockwise to rotate the
servo horn to the position shown.

Open

Locked

Front of

Truck

Front of

Truck

TRX-4 • 29

MAINTAINING YOUR MODEL

Always wear eye protection
when using compressed
air or spray cleaners and
lubricants.

Your model requires timely maintenance in order to stay in top
running condition. The following procedures should be taken

very seriously.

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

1. Cracked, bent, or damaged parts

2. Check the wheels and steering for binding.

3. Check the operation of the shock absorbers.

4. Check the wiring for any frayed wires or loose connections.

5. Check the mounting of the receiver and servo(s) and
speed control.

6. Check the tightness of the wheel nuts with a wrench.

7. Check the operation of the radio system, especially the
condition of the batteries.

8. Check for any loose screws in the chassis structure
or suspension.

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

10. Check the tightness of the slipper clutch.

Other periodic maintenance:

• 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 0.35mm or less, the friction
disc should be replaced. Measure
the pad thickness using calipers.

• Shocks: Keep the oil level in the shocks full. Use only 100%
pure silicone shock oil to prolong the life of the seals. If you are
experiencing leakage around the top of the shock, inspect the
o-ring in the top cap for signs of damage or distortion from
overtightening. If the bottom of the shock is leaking, then it
is time for a rebuild. The Traxxas rebuild kit for two shocks is
part #8262.

• Suspension: Periodically inspect the model for signs of damage,
such as bent rod ends, bent linkage rods, bent shock shafts, loose
screws, or any signs of stress or bending. Replace components as
needed.

• Driveline: Inspect the driveline for signs of wear such as worn,
dirty or corroded center drive shafts, dirty constant-velocity
driveshaft joints (center and front), and any unusual noise or
binding. Do not allow dirt and grime to collect in the drive cups.
After cleaning, lubricate the pins and cross pins with a drop of
light-weight machine oil. DO NOT use too much oil to avoid
build-up of dust and dirt. Remove the gear cover. Inspect the
spur gear for wear and check the tightness of the set screw in the
pinion gear. Tighten, clean, or replace components as needed.

Storage

When you are through running the model for the day, blow it off
with compressed air or use a soft bristled paint brush to dust-off
the vehicle. Always disconnect and remove the batteries from the
model whenever the model is stored. If the model will be stored for
a long time, then also remove the batteries from the transmitter.

30 • TRX-4

10

• Chassis: Keep the chassis clean of accumulated dirt and grime.
Periodically inspect the chassis for damage.

• Motor: Every 10-15 runs, remove, clean, and lubricate the motor.
Use a product such as electric motor cleaning spray to flush dirt
out of the motor. After cleaning, lubricate the bushings at each
end of the motor with a drop of light-weight electric motor oil.

If you have questions or need technical assistance, call Traxxas at

1-888-TRAXXAS

(1-888-872-9927) (U.S. residents only)

TQi ADVANCED TUNING GUIDE

Your Traxxas transmitter has a programmable

Multi-Function knob
that can be set to control various advanced transmitter functions (set
to Cruise Control by default, see page 17). Accessing the programming
menu is done by using the menu and set buttons on the transmitter and
observing signals from the LED. An explanation of the menu structure
follows on page 34. Experiment with the settings and features to see if
they can improve your driving experience.

Steering Sensitivity (Exponential)

The Multi-Function knob on the TQi transmitter can be programmed to
control Steering Sensitivity (also known as exponential). The standard
setting for Steering Sensitivity is “normal (zero exponential),” with
the dial full left in its range of travel. This setting provides linear servo
response: the steering servo’s movement will correspond exactly
with the input from the transmitter’s steering wheel. Turning the
knob clockwise from center will result in “negative exponential” and
decrease steering sensitivity by making the servo less responsive near
neutral, with increasing sensitivity as the servo nears the limits of its
travel range. The farther you turn the knob, the more pronounced the
change in steering servo movement will be. The term “exponential”
comes from this effect; the servo’s travel changes exponentially
relative to the input from the steering wheel. The exponential effect is
indicated as a percentage—the greater the percentage, the greater the
effect. The illustrations below show how this works.

Normal Steering Sensitivity (0%
exponential):

In this illustration, the steering
servo’s travel (and with it, the
steering motion of the model’s
front wheels) corresponds
precisely with the steering wheel.
The ranges are exaggerated for
illustrative purposes.

Decreased Steering Sensitivity
(Negative Exponential):

By turning the Multi-Function knob
clockwise, the steering sensitivity
of the model will be decreased.
Note that a relatively large amount
of steering wheel travel results in
a smaller amount of servo travel.
The farther you turn the knob,
the more pronounced the effect
becomes. Decreased steering
sensitivity may be helpful when
driving on low-traction surfaces
and when driving at high speed.
The ranges are exaggerated for illustrative purposes.

Turning Range

at Transmitter

Effective Turning

Range on Model

Throttle Sensitivity (Throttle Exponential)

The Multi-Function knob can be set to control Throttle Sensitivity.
Throttle Sensitivity works the same way as Steering Sensitivity, but
applies the effect to the throttle channel. Only forward throttle is
affected; brake/reverse travel remains linear regardless of the Throttle
Sensitivity setting.

Steering Percentage (Dual-Rate)

The Multi-Function knob can be set to control the amount (percentage)
of servo travel applied to steering. Turning the Multi-Function knob
fully clockwise will deliver maximum steering throw; turning the
knob counterclockwise reduces steering throw (Note: turning the dial
counterclockwise to its stop will eliminate all servo travel). Be aware that
the steering End Point settings define the servo’s maximum steering
throw. If you set Steering Percentage to 100% (by turning the Multi­Function knob fully clockwise), the servo will travel all the way to its
selected end point, but not past it. Many racers set Dual-Rate so they
have only as much steering throw as they need for the track’s tightest
turn, thus making the model easier to drive throughout the rest of the
course. Reducing steering throw can also be useful in making a model
easier to control on high-traction surfaces, and limiting steering output
for oval racing where large amounts of steering travel are not required.

Braking Percentage

The Multi-Function knob may also be set to control the amount of brake
travel applied by the servo in a nitro-powered model. Electric models do
not have a servo-operated brake, but the Braking Percentage function
still operates the same way in electric models. Turning the Multi-Function
knob full clockwise will deliver maximum brake throw; turning the
knob counterclockwise reduces brake throw (Note: Turning the dial
counterclockwise to its stop will eliminate all brake action).

Throttle Trim

Setting the Multi-Function knob to serve as throttle trim will allow you
to adjust the throttle’s neutral position to prevent unwanted brake drag
or throttle application when the transmitter trigger is at neutral. Note:
Your transmitter is equipped with a Throttle Trim Seek Mode to prevent
accidental runaways. See the sidebar for more information.

Traxxas Stability Management (TSM)

The Multi-Function knob on the TQi
transmitter can be programmed to
control Traxxas Stability Management
or TSM. TSM allows you to experience all the speed and acceleration that
was engineered into your Traxxas model by helping you to maintain
control of the vehicle in low-traction situations or over rough terrain. TSM
also dramatically improves braking control and makes corrections for you,
without intruding on your fun, or creating unexpected side effects.

Starting Over:

Restoring Factory Defaults

When programming your TQi
transmitter, you may feel the
need to start over with a clean
slate. Follow these simple steps
to restore the factory settings:

1. Turn the transmitter off.

2. Hold both MENU and SET.

3. Turn the transmitter on.

4. Release MENU and SET.
The transmitter LED will
blink red.

5. Press MENU 6 times. The
transmitter LED will blink
red 7 times repeatedly.

6. Press SET to clear settings.
The LED will turn solid
green and the transmitter is
restored to default.

TRX-4 • 31

TQi ADVANCED TUNING GUIDE

Failsafe

Your Traxxas radio system is
equipped with a built-in failsafe
function that returns the throttle
to its last saved neutral position
in the event of a signal loss. The
LED on the transmitter and on the
receiver will rapidly flash red.

In order to re-acquire the signal
after the failsafe has activated,
you will need to walk a longer
distance closer to the model than
the distance the model travelled
out of range. Simply keep walking
towards the model until you re­acquire the signal.

Throttle Trim Seek Mode

When the Multi-Function knob is
set to throttle trim, the transmitter
remembers the throttle trim
setting. If the throttle trim knob
(Multi-Function knob) is moved
from the original setting while
the transmitter is off, or while the
transmitter was used to control
another model, the transmitter
ignores the actual position of
the trim knob. This prevents the
model from accidentally running
away. The LED on the face of the
transmitter will rapidly blink green
and the throttle trim knob (Multi­Function knob) will not adjust the
trim until it is moved back to its
original position saved in memory.
To restore throttle trim control,
simply turn the Multi-Function
knob either direction until the LED
stops blinking.

32 • TRX-4

The recommended (default)
setting for TSM is to rotate the
knob to the 12:00 position (the
zero mark on the dial).

Recommended setting

Turn the knob clockwise to
increase assistance; turn the knob
counterclockwise to decrease
assistance. Turn the knob
counterclockwise to its stop to
turn TSM completely off.

Note: TSM is deactivated
automatically when driving or
braking in reverse.

Decrease

assistance

Increase

assistance

When driving on surfaces with
some traction, decrease the TSM
setting to allow the vehicle to

TSM o

feel more “loose”. On surfaces
with very little traction (loose
dirt, smooth concrete, ice/snow), increase TSM to maximize acceleration

Steering and Throttle End Points

The TQi transmitter allows you to choose the limit of the servo’s travel
range (or its “end point”) independently for left and right travel (on the
steering channel) and throttle/brake travel (on the throttle channel).
This allows you to fine-tune the servo settings to prevent binding
caused by the servo moving steering or throttle linkages (in the case
of a nitro model) farther than their mechanical limits. The end point
adjustment settings you select will represent what you wish to be the
servo’s maximum travel; the Steering Percentage or Braking Percentage
functions will not override the End Point settings.

Steering and Throttle Sub-Trim

The Sub-Trim function is used to precisely set the neutral point of the
steering or throttle servo in the event that simply setting the trim knob
to “zero” does not completely center the servo. When selected, Sub-Trim
allows finer adjustment to the servo output shaft’s position for precise
setting of the neutral point. Always set the Steering Trim knob to zero
before making final adjustment (if required) using Sub-Trim. If Throttle
Trim has been previously adjusted, the Throttle Trim will need to be
reprogrammed to “zero” before making final adjustment using Sub-Trim.

and control. TSM should be disabled when precise wheel placement is
needed, such as during rock crawling or scaling extreme terrain.

Note: TSM must be completely turned off while adjusting steering trim.

TRANSMITTER LED CODES

LED Color / Pattern Name Notes

Solid green Normal Driving Mode See page 15 for information on how to use your transmitter controls.

Slow red (0.5 sec on / 0.5 sec off) Binding See page 17 for more information on binding.

Flashing fast green (0.1 sec on / 0.15 sec off) Throttle Trim Seek Mode

Flashing medium red (0.25 sec on / 0.25 sec off) Low Battery Alarm Put new batteries in the transmitter. See page 13 for more information.

Flashing fast red (0.125 sec on / 0.125 sec off) Link Failure / Error

Programming Patterns

or

Counts out number (green or red), then pauses Current menu position See Menu Tree for more information.

x

Fast green 8 times Menu setting accepted (on SET)

8

Fast red 8 times Menu SET invalid User error, such as trying to delete a locked model.

x

8

RECEIVER LED CODES

LED Color / Pattern Name Notes

Solid green Normal Driving Mode See page 15 for information on how to use your transmitter controls.

Slow red (0.5 sec on / 0.5 sec off) Binding See page 17 for more information on binding.

Flashing fast red (0.125 sec on / 0.125 sec off) Fail-Safe / Low Voltage Detect

Turn the Multi-Function knob right or left until the LED stops flashing.
See the sidebar for more information.

Transmitter and receiver are no longer bound. Turn the system off and then
back on to resume normal operation. Find source of the link failure (i.e., out of
range, low batteries, damaged antenna).

Consistent low voltage in the receiver triggers Fail-Safe so there is enough
power to center the throttle servo before it completely loses power.

TQi ADVANCED TUNING GUIDE

Setting Lock

Once you’ve adjusted all of these settings the way you like them, you
may want to disable the Multi-Function knob so none of your settings
can be changed. This is especially handy if you operate multiple vehicles
with a single transmitter via Traxxas Link

™

Model Memory.

Multiple Settings and the Multi-Function Knob

It is important to note that settings made with the Multi-Function
knob are “overlaid” on top of each other. For example, if you assign the
Multi-Function to adjust Steering Percentage and set it for 50%, then
reassign the knob to control Steering Sensitivity, the transmitter will
“remember” the Steering Percentage setting. Adjustments you make
to Steering Sensitivity will be applied to the 50% steering throw setting
you selected previously. Likewise, setting the Multi-Function knob to
“disabled” will prevent the knob from making further adjustments, but
the last setting of the Multi-Function knob will still apply.

TRAXXAS LINK MODEL MEMORY

Traxxas Link Model Memory is an exclusive, patent-pending feature
of the TQi transmitter. Each time the transmitter is bound to a new
receiver, it saves that receiver in its memory, along with all the settings
assigned to that receiver. When the transmitter and any bound receiver
are switched on, the transmitter automatically recalls the settings for
that receiver. There is no need to manually select your vehicle from a list
of model memory entries.

Model Lock

The Traxxas Link Model Memory feature can store up to thirty models
(receivers) in its memory. If you bind a thirty-first receiver, Traxxas Link
Model Memory will delete the “oldest” receiver from its memory (in
other words, the model you used the longest time ago will be deleted).
Activating Model Lock will lock the receiver in memory so it cannot be
deleted.

You may also bind multiple TQi transmitters to the same model, making
it possible to pick up any transmitter and any previously bound model
in your collection and simply turn them on and drive. With Traxxas Link
Model Memory, there is no need to remember which transmitter goes
with which model, and there is never a need to have to select any model
from a list of model memory entries. The transmitter and receiver do it
all for you automatically.

To activate Model Lock:

1. Switch on the transmitter and receiver you wish to lock.

2. Press and hold MENU. Release when the status LED blinks green.

3. Press MENU three times. The status LED will blink green four
times repeatedly.

4. Press SET. The status LED will blink green in single-flash intervals.

5. Press SET once. The status LED will blink red once repeatedly.

6. Press MENU once. The status LED will blink red twice repeatedly.

7. Press SET. The LED will blink rapidly green. The memory is now locked.
Press and hold MENU to return to driving mode.

Note: To unlock a memory, press SET twice at step 5. The LED will

blink rapidly green to indicate the model is unlocked. To unlock all
models, press MENU twice at step 6 and then press SET.

To delete a model:

At some point, you may wish to delete a model you no-longer drive
from the memory.

1. Switch on the transmitter and receiver you wish to delete.

2. Press and hold MENU. Release when the status LED blinks green.

3. Press MENU three times. The status LED will blink green four
times repeatedly.

4. Press SET once. The status LED will blink green once repeatedly.

5. Press MENU once. The status LED will blink green twice repeatedly.

6. Press SET. The memory is now selected to be deleted. Press SET to
delete the model. Press and hold MENU to return to driving mode.

TRX-4 • 33

TQi ADVANCED TUNING GUIDE

MENU TREE

The Menu Tree below shows how to navigate through
the TQi transmitter’s various settings and functions.
Press and hold MENU to enter the Menu Tree, and use
the following commands to navigate through the menu
and select options.

MENU: When you enter a menu, you always start at the

top. Press MENU to move down the Menu Tree.
When you reach the bottom of the tree, pressing
MENU again will return you to the top.

SET: Press SET to move across the Menu Tree and select

options. When an option is committed to the
transmitter’s memory, the status LED will rapidly
blink green.

BACK: Press both MENU and SET to go back one level in

the Menu Tree.

EXIT: Press and hold MENU to exit programming.

Your selected options will be saved.

ECHO: Press and hold SET to activate the “echo” function.

Echo will “play back” your current position on the
Menu Tree should you lose your place. For example:
If your current position is Steering Channel End
Points, holding SET will cause the LED to blink green
twice, green once, and then red three times. Echo
will not alter your adjustments or change your
position in the programming sequence.

Below is an example of how to access a function in the Menu
Tree. In the example, the user is setting the Multi-Function knob
to be a Steering % (Dual-Rate) control.

To set the Multi-Function knob to control STEERING % (DUAL-RATE):

1. Switch the transmitter on.

2. Press and hold MENU until the green LED lights. It will blink in single
intervals.

3. Press SET. The red LED will blink in single intervals to indicate Steering
Sensitivity (Expo) has been selected.

4. Press MENU twice. The red LED will blink three times repeatedly to
indicate Steering % (Dual-Rate) has been selected.

5. Press SET to select. The green LED will blink 8 times fast to indicate
successful selection.

6. Press and hold MENU to return to driving mode.

Restoring Factory Defaults:

Transmitter

OFF

34 • SUMMIT

*Torque Control is a feature designed only for use with the power system in the Traxxas Funny Car Race Replica (Model #6907).

Hold both

MENU and SET

Transmitter ONRelease MENU and SET

red LED blinks

Enter Programming

Press and hold
MENU for 3 seconds

Multi-Function Knob

1

One Blink Green

Press

MENU

Channel Setup

2

Two Blinks Green

Press

MENU

Mode Selection

3

Three Blinks Green

Press

MENU

Traxxas-Link

4

Four Blinks Green

Press MENU 6 times

Red LED blinks

7 times repeatedly

Press SET to clear settings

LED will turn solid green

Transmitter is restored to default

Press

SET

Press

SET

Press

SET

Press

SET

Press MENU to move through options.
Press SET to select an option.

Steering Sensitivity (Expo)

1

One Blink Red

Throttle Sensitivity (Expo)

2

Two Blinks Red

Steering % (Dual-Rate)

3

Three Blinks Red

Braking %

4

Four Blinks Red

Throttle Trim

5

Five Blinks Red

Knob Disabled

6

Six Blinks Red

Torque Control*

7

Seven Blinks Red

TSM

8

Eight Blinks Red

Cruise Control

9

Nine Blinks Red

Steering (Channel 1)

1

One Blink Green

Press MENU

Throttle (Channel 2)

2

Two Blinks Green

Press SET to select an option.

Electric

1

One Blink Red

Press MENU

Nitro

2

Two Blinks Red

Model Locking

1

One Blink Green

Press

MENU

Delete Model

2

Two Blinks Green

Press

Press

SET

Press

SET

SET

Press

SET

Note: The transmitter is “live” during programming
so you can test the settings real time without having
to exit the Menu Tree.

Press MENU to move through options.
Press SET to select an option.

Servo Reversing

1

One Blink Red

Sub-Trim

2

Two Blinks Red

End Points

3

Three Blinks Red

Turn left to desired end point and press set to save.
To reset max throw: Let go of controls and press SET.

Reset End Points

4

Four Blinks Red

Servo Reversing

1

One Blink Red

Sub-Trim

2

Two Blinks Red

End Points

3

Three Blinks Red

forward to desired end point and press set to save.
To reset max throw: Let go of controls and press SET.

Reset End Points

4

Four Blinks Red

Unlock

1

One Blink Red

Lock

2

Two Blinks Red

Unlock All

3

Three Blinks Red

Conrm Deletion

1

One Blink Red

Press SET to reverse
servo direction.

Use knob to adjust
sub-trim. Press SET to save.

Use steering wheel to
adjust. Turn right to desired
end point, press set to save.

Press SET to restore factory
default end points.

Press SET to reverse
servo direction.

se knob t

U
trim. Press SET to save.

Use trigger to adjust. Pull
back to desired end point,
press set to save. Push

Press SET to restore factory
default end points.

o adjust sub-

Set Multi-Function
knob for STEERING
SENSITIVITY (Expo)

Set Multi-Function
knob for THROTTLE
SENSITIVITY (Expo)

Set Multi-Function
knob for STEERING
(%)DUAL-RATE

Set Multi-Function
knob for BRAKING
PERCENTAGE (%)

Set Multi-Function
knob for
THROTTLE TRIM

To LOCK the
Multi-Function knob

Set Multi-Function
knob for TORQUE
CONTROL*

Set Multi-Function
knob for TSM

Set Multi-Function
knob for CRUISE
CONTROL

To REVERSE
the direction of
STEERING servo

To set the SUB TRIM
of the STEERING
servo

To set the END
POINTS of the
STEERING servo

To reset the END
POINTS of STEERING
servo to defaults

To REVERSE
the direction of
THROTTLE servo

To set the SUB TRIM
of the THROTTLE
servo

To set the END
POINTS of the
THROTTLE servo

To reset the END
POINTS of THROTTLE
servo to defaults

To REVERSE the
direction of SHIFT
servo

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press/hold MENU

green LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

Press MENU

green LED blinks (x2)

x

2

x

2

x

2

x

2

x

2

x

2

x

2

x

2

x

2

x

Press SET to confirm

green LED blinks (x8)

x

Press MENU to confirm

red LED blinks (x2)

x

Press MENU twice

red LED blinks (x3)

x

Press MENU 3 times

red LED blinks (x4)

x

Press MENU 4 times

red LED blinks (x5)

x

Press MENU 5 times

red LED blinks (x6)

x

Press MENU 6 times

red LED blinks (x7)

x

Press MENU 7 times

red LED blinks (x8)

x

Press MENU 8 times

red LED blinks (x9)

Press SET

green LED blinks

Press SET

green LED blinks

Press SET

green LED blinks

Press SET

green LED blinks

Press SET

green LED blinks

Press SET

green LED blinks

Press SET

green LED blinks

Press SET

green LED blinks

Press SET

green LED blinks

8

Press/hold MENU

returns to driving mode

2

Press SET to select

green LED blinks (x8)

3

Press SET to select

green LED blinks (x8)

4

Press SET to select

green LED blinks (x8)

5

Press SET to select

green LED blinks (x8)

6

Press SET to lock

green LED blinks (x8)

7

Press SET to select

green LED blinks (x8)

8

Press SET to select

green LED blinks (x8)

9

Press SET to select

green LED blinks (x8)

green LED blinks (x2)

green LED blinks (x2)

green LED blinks (x2)

green LED blinks (x2)

Press MENU twice

green LED blinks (x3)

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press MENU

Press MENU

Press MENU

Press MENU

x

8

x

8

x

8

x

8

x

8

x

8

x

8

x

8

x

2

x

2

x

2

x

2

x

3

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

x

Press SET to reverse

servo direction

x

Press MENU

red LED blinks (x2)

x

Press MENU twice

red LED blinks (x3)

x

Press MENU 3 times

red LED blinks (x4)

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Press SET

red LED blinks

Function knob until the

LED turns solid green.

8

returns to driving mode

2

Use Multi-Function

3

wheel to desired max

left and right travel

4

Press SET to reverse

Press MENU 3 times

Press SET to reverse

Adjust the Multi-

Press/hold MENU

knob to set neutral

Turn steering

x

Press SET

to reset end points

x

servo direction

x

Press MENU

red LED blinks (x2)

x

Press MENU twice

red LED blinks (x3)

x

red LED blinks (x4)

x

servo direction

to save each position

8

returns to driving mode

8

returns to driving mode

2

3

trigger to set desired
max throttle or brake

4

green LED blinks (x8)

8

returns to driving mode

Press SET

to save position

Press SET

Press/hold MENU

Press/hold MENU

Use Multi-Function

knob to set neutral

Use throttle

Press SET

Press/hold MENU

MENU TREE FORMULAS

To select functions and make adjustments to the TQi transmitter without
referencing the Menu Tree, turn your transmitter on, find the function in the
left column you wish to adjust, and simply follow the corresponding steps

1

Always turn your

transmitter on first.

x

8

Press/hold MENU

returns to driving mode

x

8

x

8

Turn steering wheel

to test settings

x

Press SET

to save position

Press SET to save
Use trigger to test

Press/hold MENU

returns to driving mode

IF END POINTS

Press/hold MENU

returns to driving mode

8

Press/hold MENU

returns to driving mode

IF END POINTS

Press/hold MENU

returns to driving mode

ARE OK:

ARE OK:

IF END POINTS

NEED TO BE

CHANGED:

Press SET

and repeat steps 6-8

IF END POINTS

NEED TO BE

CHANGED:

Press SET

and repeat steps 7-9

SUMMIT • 35

*Torque Control is a feature designed only for use with the power

system in the Traxxas Funny Car Race Replica (Model #6907).

.

TQi ADVANCED TUNING GUIDE

The Traxxas Link
Wireless Module is sold
separately (part #6511).
The Traxxas Link
application is available
from the Apple App store
for iPhone, iPad, or iPod
touch and on Google
Play for Android devices.
iPhone, iPad, iPod touch, or
the Android device are not
included with the Traxxas
Link Wireless Module.

For more information
about the Traxxas Link
Wireless Module and the
Traxxas Link application,
visit Traxxas.com.

36 • TRX-4

PROGRAMMING YOUR TQi TRANSMITTER WITH
YOUR APPLE iPHONE, iPAD, iPOD TOUCH, OR

ANDROID MOBILE DEVICE

The Traxxas Link™ Wireless Module
(part #6511, sold separately) for the TQi
transmitter installs in minutes to transform
your Apple® iPhone®, iPad®, iPod touch®,
or Android™ device into a powerful
tuning tool that allows you to replace the
transmitter’s button/LED programming
system with an intuitive, high-definition,
full-color graphical user interface.

Traxxas Link

The powerful Traxxas Link app (available in the Apple App Store℠
Google Play™) gives you complete control over the operation and tuning
of your Traxxas model with stunning visuals and absolute precision. Install
Traxxas Link telemetry sensors on the model, and Traxxas Link displays
real-time data such as speed, RPM, temperature, and battery voltage.

Compatible with:
iPod touch (5th generation and later)
iPad mini
iPad Pro

iPad 2
iPad Air
iPhone 4s (and later)
Android 4.4 (and later)

or on

Apple, the Apple logo, iPhone, iPad, and iPod touch are trademarks of Apple Inc., registered in the U.S. and other countries.
App Store is a service mark of Apple Inc. Android and Google Play are trademarks of Google Inc.

Intuitive iPhone, iPad, iPod
touch, and Android interface

Traxxas Link makes it easy to
learn, understand, and access
powerful tuning options. Control
Drive Effects settings such as
steering and throttle sensitivity;
steering percentage; braking
strength; and throttle trim by
simply touching and dragging
the sliders on the screen.

Tap and slide to adjust Steering Sensitivity,

Throttle Trim, Braking Percent, and more!

Real-Time Telemetry

When you equip your model
with sensors, the Traxxas Link
dashboard comes to life showing
you speed, battery voltage, RPM,
and temperature. Set threshold
warnings and log maximums,
minimums, or averages. Use the
recording function to document
your dashboard view, with
sound, so that you can keep
your eyes on your driving and
not miss a single apex.

The customizable Traxxas Link dashboard delivers

real-time rpm, speed, temperature, and voltage data.

Manage up to 30 Models with Traxxas Link

The TQi radio system
automatically keeps track of
what vehicles it has bound to
and what settings were used
for each--up to 30 models total!
Traxxas Link provides a visual
interface to name the models,
customize their settings, attach
profiles, and lock them into
memory. Simply choose a model
and any previously bound
transmitter, power them up,

Traxxas Link Model Memory simplifies organizing

and start having fun.

your collection of vehicles.

170922 82066-4-OM-EN-R00

owner’s manual

MODEL 82066-4

6250 Traxxas Way McKinney, Texas 75070

1-888-TRAXXAS