Traxxas e-maxx User Manual

MODEL 3903

owners manual

INTRODUCTION

3 BEFORE YOU

PROCEED

4 SAFETY

PRECAUTIONS

5 TOOLS, SUPPLIES

AND REQUIRED

EQUIPMENT

6 ANATOMY OF

THE E-MAXX

7 QUICK START:

GETTING UP

TO SPEED

8 TRAXXAS TQ

RADIO SYSTEM

16 ADJUSTING

THE ELECTRONIC

SPEED CONTROL

18 DRIVING YOUR MODEL

21 TUNING

ADJUSTMENTS

i

Thank you for purchasing the new Traxxas E-Maxx electric monster
truck. When it comes to gut-wrenching, wheelie-popping monster
torque, nothing comes close to E-Maxx. We are confident you will
appreciate the latest performance and appearance enhancements
that have been made to this legendary model. With tough twin
Titan® 550 motors and a powerful EVX-2 electronic speed control,
the E-Maxx is built for rock-stomping action. The new chassis
and water-resistant electronics are made to take abuse. Even
innovative technology from our top-of-the-line Revo® has found
it’s way into E-Maxx in the form of the patent-pending Torque­Control™ slipper and sealed driveshafts.

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
best-performing 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 road, but it’s very important that you take some time to
read through the Owners Manual. This manual contains all the
necessary set-up 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.

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 7 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

26 MAINTAINING

YOUR MODEL

i

27 TQ

ADVANCED

TUNING GUIDE

2 • E-MAXX

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!

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 BuyTraxxas.com. You can save time, along with shipping
and handling costs, by purchasing replacement parts from your
local dealer.

Do not hesitate to contact us with any of your product support needs.
We want you to be thoroughly satisfied with your new model!

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

SAFETY PRECAUTIONS

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 is very fast and 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 motors, batteries, 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.

BATTERIES AND BATTERY CHARGING

Your model uses rechargeable batteries that must be handled with
care for safety and long battery life. Make sure to read and follow all
instructions and precautions that were provided with your battery
packs and your charger. It is your responsibility to charge and care for
your battery packs properly. In addition to your battery and charger
instructions, here are some more tips to keep in mind.

• Never leave batteries to charge unattended.

• Remove the batteries from the model while charging.

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

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

• Children should have responsible adult supervision when charging
and handling batteries.

• Do not use battery packs that have been damaged in any way.

• Do not use battery packs that have damaged wiring, exposed wiring,
or a damaged connector.

• Only use approved chargers for NiMH battery packs (such as the
Traxxas EZ-Peak
charge rate of 4 amps.

™

Charger, Part #2930). Do not exceed the maximum

Traxxas
1100 Klein Road
Plano, Texas 75074
Phone: [phone]
Toll-free 1-888-TRAXXAS

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

Entire contents ©2012 Traxxas.
Traxxas, Ready-To-Race, Ready­To-Win, E-Maxx and ProGraphix
are trademarks or registered
trademarks of Traxxas. Other
brand names and marks are
the property of their respective
holders and are used only for
purposes of 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.

E-MAXX • 3

SAFETY PRECAUTIONS

bluehighway font

Choose the Model That is Right For You. For individual Models

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

Previous experience with radio controlled models is recommended.
Models require a higher level of setup, maintenance, or support equipment.

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

Previous experience with radio controlled models is recommended.
Model requires a higher level of setup, maintenance, or support equipment.

BELOW TEXT HAS BEEN UPDATED on 3-14-07
Kent wants maintenance text to be at the END of the paragraph.-- KB

1500

3600

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.

Previous experience with
radio controlled models
is recommended. Models
require a higher level of
setup, maintenance, or
support equipment.

1

4 • E-MAXX

• Do not short-circuit the battery pack. This may cause burns and severe
damage to the battery pack.

• Do not burn or puncture the batteries. Toxic materials could be
released. If eye or skin contact occurs, flush with water.

• Store the battery pack in a dry location, away from heat sources and
direct sunlight.

• Nickel Metal Hydride batteries must be recycled or disposed of properly.

Recycling Your Traxxas Power Cell NiMH Battery

Traxxas strongly encourages you to recycle your Power Cell battery
when it has reached the end of its useful life. Do not throw your

battery in the trash. All Power Cell 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.

LiPo Batteries

Lithium Polymer (LiPo) batteries are becoming popular for use in R/C
models due to their compact size, high energy density, and high-current
output. However, these types of batteries require special care and
handling procedures for long life and safe operation. Warning: 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 16 use or handle LiPo battery packs
without the supervision of a knowledgeable and responsible adult.

Your model is able to use LiPo batteries with nominal voltage not to
exceed 7.4 volts (2S packs) for each battery (4S total). LiPo batteries
have a minimum safe discharge voltage threshold that should not be
exceeded. The EVX-2 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 on the speed control is just one part of a
comprehensive plan for safe LiPo battery use. It is critical for you, the user,

to follow all other instructions supplied by the battery manufacturer
and the charger manufacturer for proper charging, use, and storage
of LiPo batteries. Do not attempt to charge LiPo batteries with the
Traxxas charger included in this package. Make sure you understand
how to use your LiPo batteries. Be aware that Traxxas shall not be liable

for any special, indirect, incidental, or consequential damages arising out
of the installation and/or use of LiPo batteries in Traxxas models. 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.

SPEED CONTROL

• Disconnect the Batteries: Always disconnect the batteries from the
speed control when not in use.

• 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 heat sink can get extremely hot, so be careful
not to touch it until it is cool. Supply adequate airflow for cooling.

• Always adhere to the
minimum and maximum
limitations of the EVX-2 as
stated in the specifications
table. Do not mix battery

types and capacities. Use the
same voltage and capacity
for both batteries. Using
mismatched battery packs
could damage the batteries
and electronic speed control.

• Use Stock Connectors: If you decide to change the battery
or motor connectors, only change one battery or motor connector
at a time. This will prevent damage from accidentally mis-wiring
the speed control. Please note that modified speed controls can be
subject to a rewiring fee when returned for service. Removing the
battery connector on the speed control or using connectors with
no reverse-polarity protection on the speed control will void the
product’s warranty.

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

• Always Use Heat Sinks: Three heat sinks are factory-installed on
the speed control and must be used for maximum cooling and
performance.

• No Reverse Voltage: The speed control is not protected against
reverse polarity voltage. When changing the battery and/or motor, be
sure to install the same type of connectors to avoid reverse polarity
damage to the speed control. Removing the battery connectors on
the speed control or using the same-gender connectors on the speed
control will void the product’s warranty.

• Do Not Let the Transistor Tabs Touch: Never allow the three separate
transistor banks to touch each other or any exposed metal. This will
create a short circuit and damage the speed control. (For example,
laying a metal tool across the heat sinks can damage the speed control.)

• No Schottky Diodes: External Schottky diodes are not compatible
with reversing speed controls. Using a Schottky diode with the EVX-2
will damage the ESC and void the 30-day warranty.

1500

3600

Do not mix battery
capacities. Use two

batteries with the

same capacity.

Do not use a 6-cell 7.2V
battery in combination

with a 7-cell battery

8.4V pack.

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

2.0mm “T” wrench 8mm/5mm wrench

Suspension

multi-tool

REQUIRED EQUIPMENT

(sold separately)

1.5mm “L” wrench

Antenna nut

wrench

2.5mm “L” wrench

Pre-load spacers and shock pistons

(on parts tree) see page 21

Universal wrench

Two 7-cell NiMH battery packs with

Traxxas High-Current Connectors*

Body clips

Foam blocks (battery spacers)

see page 12

For more information on
batteries, see Use the Right
Batteries on page 11.

A peak-detecting charger
is recommended for best
performance and longest
battery life. For more
information, see Use the
Right Charger on page 12.

Recommended Equipment

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

• Safety glasses

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

• Hobby knife

• Side cutters and/or needle
nose pliers

• Philips screwdriver

• Soldering iron

4 AA alkaline

batteries

NiMH battery charger

(TRX EZ-Peak

™

shown, Part #2930)

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

E-MAXX • 5

ANATOMY OF THE E-MAXX

Half Shaft

Toe Link
(Turnbuckle)

Electronic Speed
Control (EVX-2)

Rear
Body Mount

Rear
Shock Tower

Skid Plate

Rear
Bumper

Steering Servo

Slipper Clutch Access Plug

Pinion Gear (left side)

Battery Hold-Down

Battery Compartment

Motors (Titan)

Hex Hub

Pivot Ball

Axle Carrier

Toe Link

(Turnbuckle)

Suspension
Arm (Front)

Front Body

Mount

Receiver

Box

Skid Plate

Front

Bumper

Rear
Bulkhead

Rear
Differential

Suspension
Arm (Rear)

6 • E-MAXX

Transmission

Chassis

Spur Gear

Battery Compartment

Antenna Mount

Battery Hold-Down

Steering Servo

Light Pipe

Front

Differential

Front

Bulkhead

Front

Shock Tower

Ultra Shock

(Oil Damper)

™

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 8. Detail your model • See page 8

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

2. Charge the battery packs • See sidebar, page 12 9. Drive your model • See page 18

Fully charge the two included battery packs. Charge your batteries
now so it will be ready when you finish the other setup procedures.

3. Install batteries in the transmitter • See page 11 10. Maintain your model • See page 26

The transmitter requires 4 AA alkaline or rechargeable batteries. Follow these critical steps to maintain the performance

4. Install battery packs in the model • See page 12

Your model requires two fully charged battery packs (included).

5. Turn on the radio system • See page 13

Make a habit of turning the transmitter on first, and off last.

Apply other decals if desired.

Driving tips and adjustments for your model.

of your model and keep it in excellent running condition.

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.

6. Check servo operation • See page 14

Make sure the steering servos are working correctly.

7. Range test the radio system • See page 14

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

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

E-MAXX • 7

TRAXXAS TQi RADIO SYSTEM

Applying the Decals

The main decals for your
model have been applied at
the factory. The 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 • E-MAXX

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 compliment 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 Sub-Trims. 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 functions. The detailed instructions (page 27) and Menu
Tree (page 29) 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 27.

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.

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

8

motors have armatures that are 30% longer than 540 motors.

Frequency band - The radio frequency used by the transmitter to

send signals to your model. This model operates on the 2.4GHz
direct-sequence spread spectrum.

LiPo - Abbreviation for Lithium Polymer. Rechargeable LiPo

battery packs are known for their special chemistry that allows
extremely high energy density and current handling in a
compact size. These are high performance batteries that require
special care and handling. 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 TQi 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.

IMPORTANT RADIO SYSTEM PRECAUTIONS

• For maximum range, always point the front of transmitter toward

the model.

• Do not kink the receiver’s antenna wire. Kinks in the antenna wire

will reduce range.

• DO NOT CUT any part of the receiver’s antenna wire. Cutting the

antenna will reduce range.

• Extend the antenna wire in the model as far as possible for

maximum range. It is not necessary to extend the antenna wire out
of the body, but wrapping or coiling the antenna wire should be
avoided.

• Do not allow the antenna wire to extend outside the body without

the protection of an antenna tube, or the antenna wire may get
cut or damaged, reducing range. It is recommended to keep the
wire inside the body (in the antenna tube) to prevent the chance
of damage.

TRAXXAS TQi RADIO SYSTEM

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

E-MAXX • 9

TRAXXAS TQi RADIO SYSTEM

EVX-2 Wiring Diagram

Your model is equipped with the newest TQi 2.4 GHz transmitter
with Traxxas Link

™

Model Memory. The transmitter has two
channels for controlling your throttle and steering. The receiver
inside the model has 5 output channels. Your model is equipped
with one servo and an electronic speed control.

TRANSMITTER AND RECEIVER

Set Button

Red/Green Status LED

see page 28 for more info

Menu Button

Steering
Trim

Multi-Function
Knob

Throttle
Trigger

Throttle Neutral

Adjust

Steering Wheel

Sensor Expansion

Port

MODEL WIRING DIAGRAM

Antenna

CH4
CH4

CH3
CH3

CH2
CH2

CH1
CH1

CH1
CH1

S
S

+
+

-

-

Receiver

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

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

* Not used ** Accessory sensor port for use with TQi Docking Base
(see Traxxas.com and included materials for more information)

**

EVX-2 ELECTRONIC SPEED CONTROL

To Motor

Channel 1
Steering Servos

Motors

®

)

(Titan

V/T
V/T

RPM
RPM

BA
B
A

CH5

TT

CH5

T
T
/
/

WATERPROOF

16.8V ESC

High-Current
Connector

Channel 2
EVX-2 Electronic
Speed Control

10 • E-MAXX

Link
Button

LED

Battery Connector

Power Switch Battery Compartment

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

High-Current

Heat Sinks

WATERPROOF

16.8V E SC

EZ-Set Button

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 or
freshly charged 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 28 for more
information on the transmitter Status LED codes.

TRAXXAS TQi RADIO SYSTEM

If the power indicator 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
28 to identify the code.

Use the Right Batteries

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

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

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

3

E-MAXX • 11

TRAXXAS TQi RADIO SYSTEM

Using the Right Charger

The most convenient type
of charger for charging
the included battery packs
is an AC peak-detecting
charger that plugs directly
into an AC wall outlet, such
as the TRX EZ-Peak™ (Part
#2930). It contains special
peak-detection circuitry
that automatically shuts the
charger off when the battery
is fully charged.

For faster charging, the
included battery may be
charged at 4 amps. The TRX
EZ-Peak is a 4 amp charger
and will charge the included
battery in about 45 minutes!

Caution: Never use a
15-minute timed charger
to recharge your model’s
battery packs. Overcharging
may result, causing damage
to the battery packs.

INSTALLING BATTERY PACKS

The included batteries must be fully charged
before installation in the model. The battery
packs should be removed from the vehicle
before charging. Do not leave the battery
unattended while charging.

1. Remove the battery hold-down by
pressing on the release tab and lifting out
the hold-down.

2. Install the battery pack with the battery
wires facing the rear of the model.

3. Insert the tabs of the battery hold-down into
the slots in the rear hold-down retainer (A).
Swing the battery hold down towards the
chassis and snap (lock) the end into the front
hold-down retainer (B).

Using Different Battery Configurations

The battery hold-downs are
capable of accommodating
either side-by-side racing
style packs or the more
common stick packs. The
battery compartments are
configured for stick packs
from the factory. The
number on each side of
the hold down indicates
the battery height in
millimeters that hold-
down can accommodate.

“25” - Standard stick packs

“23” - Side-by-side packs

25mm side: Standard

NiMH stick pack setup

Release Tab

Note that one side is labeled “25” and other side is labeled “23”. The
25mm side is for use with typical stick type battery packs. If you are
using side-by-side racing packs,

simply flip the hold-down over to the
23mm side and use it on the opposite side of the chassis. Accessory hold
downs and foam (part #3927X) are available to accommodate larger
battery packs. See the 3903 E-Maxx parts list for more information.

When using 6-cell battery packs, install the supplied foam block
(spacer) into the front of the battery compartment. The spacers are
located in your instructions package. The spacers are shaped to
conform to the chassis. There is a right and a left. Test fit them to
confirm their location. Remove the backing from the self adhesive
strips and secure them to the front of the battery compartments.

The Traxxas High Current Connector

Your model is equipped with the Traxxas High­Current Connector. Standard connectors restrict
current flow and are not capable of delivering
the power needed to maximize the output of
the EVX-2. The Traxxas connector’s gold-plated terminals with a 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.

12 • E-MAXX

23mm side: Side-by-side

NiMH pack setup

2,4

RADIO SYSTEM CONTROLS

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.

• Always use new or freshly charged 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.

1

Always turn your

transmitter on first.

2

Plug in the batteries.

3

Turn on the model.

TRAXXAS TQi RADIO SYSTEM

•

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.

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. Turn to EVX-2 Setup Programming on
page 16 for instructions.

Steering Trim

The electronic steering trim located on the
face of the transmitter adjusts the neutral
(center) point of the steering channel.

Multi-Function Knob

The Multi-Function knob can be
programmed to control a variety of functions.
From the factory, the Multi-Function knob
controls steering sensitivity, also known as exponential or “expo.”
When the knob is turned counterclockwise all the way to the left
(default position), expo is off and steering sensitivity will be linear
(the most commonly used setting). Turning the knob clockwise will
“add expo” and decrease the steering sensitivity in the initial range
of steering wheel travel left or right from center. For more detail on
steering exponential, refer to page 15.

To change the throttle neutral adjust

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

The following Traxxas High
Current Connector packages
are available from your
hobby dealer. When using
adapters, be careful not to
exceed the current rating of
the Molex connector.

Part #3060
Single Male/Female

Part #3061
Male Charge Adapter

Part #3062
Female Charge Adapter

5

E-MAXX • 13

Part #3080
2-Pack Female

Part #3070
2-Pack Male

TRAXXAS TQi RADIO SYSTEM

Using Reverse: While driving,
push the throttle trigger
forward to apply brakes.
Once stopped, return the
throttle trigger to neutral.
Push the throttle trigger
forward again to engage
proportional reverse.

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 failsafe activates
while you are operating
your model, determine the
reason for signal loss and
resolve the problem before
operating your model again.

When rechargeable batteries
begin to lose their charge,
they will fade much faster
than alkaline dry cells. 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.

14 • E-MAXX

6, 7

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).

Elevate the model on a block or a stand so that all the tires are

2.
off the ground. Make sure your hands are clear of the moving
parts of the model.

3.

Plug the battery packs in the model into the speed control.

4.

The on/off switch is integrated into the speed control. With
the transmitter on, press the EVX-2 set button for ½ second, until
the LED shines GREEN, then immediately release the button. This
turns the model on (see page 16 for more on EVX-2 setup and
operation). To turn the EVX-2 off, press the set button until the
green LED turns off. Always disconnect your batteries when the

model is not in use.

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
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.

Make sure your transmitter antenna is straight up, and then 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.

• Higher Speeds Require Greater Distance

The faster you drive your model, the more quickly it will near the
limit of radio range. At 60mph, a model can cover 88 feet every
second! It’s a thrill, but use caution to keep your model in range.
If you want to see your model achieve its maximum speed, it
is best to position yourself in the middle of the truck’s running
area, not the far end, so you drive the truck towards and past
your position. In addition to maximizing the radio’s range, this
technique will keep your model closer to you, making it easier to
see and control.

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

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 an additional
transmitter or receiver, follow these instructions. Note: the receiver
must be connected to a 4.8-6.0v (nominal) power source for binding
and the transmitter and receiver must be within 5 feet of each other.

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

TRAXXAS TQi RADIO SYSTEM

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.

Steering Sensitivity (Exponential)

The Multi-Function knob on the TQi transmitter has been
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
the left 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, when driving at high speed, or on tracks
that favor sweeping turns where gentle steering inputs are required.
The ranges are exaggerated for illustrative purposes.

Turning Range

at Transmitter

Effective Turning

Range on Model

Experiment! Try varying degrees of exponential. It’s easy to go back
to “zero” if you don’t like the effect. There’s no wrong way to adjust
exponential. Any setting that makes you more comfortable with

your model’s handling is the “right setting.”

SETTING UP THE ANTENNA

The receiver antenna has been set up
and installed from the factory.

When reinstalling the antenna, first
slide the antenna wire into bottom of
antenna tube until white tip of antenna
is at top of tube under the black cap.
Insert the base of the tube into the
antenna post. Take care not to crimp the
antenna wire. Slide the crimp nut over
the antenna tube and screw it onto the
antenna post. Use the supplied tool to
tighten the crimp nut on the post just
until the antenna tube is securely in
place. Do not over tighten or crush the
antenna wire against the chassis.

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

Nut Wrench

Antenna

Nut

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

E-MAXX • 15

ADJUSTING THE ELECTRONIC SPEED CONTROL

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EVX-2 Wiring Diagram

EVX-2 Specifications

Input Voltage:*

NiMH - 12-14 cells
(14.4 - 16.8 volts)

LiPo - 4 cells (14.8 volts)

Motor limit: 12-turns (550)

Continuous current: 30A

Peak current : 180A

BEC voltage: 6.0V DC

Transistor type: MOSFET

Motor/Battery Wiring: 14-gauge

Protection: Thermal shutdown

* This model requires two battery packs. Input

voltage listed by cells refers to the total
number of cells that may be installed in
the model. You may install two 6-cell NiMH
packs, two 7-cell NiMH packs, or two 2-cell
LiPo packs. DO NOT mix NiMH and LiPo
battery packs. Damage to the model and
batteries will result.

16 • E-MAXX

The EVX-2 electronic speed control is factory set and should not require any
adjustments. These instructions are provided for your reference.

Battery Settings (Low-Voltage Detection Setting)

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 EVX-2 will limit the power
output to 50% throttle. When the battery voltage attempts to fall below the
minimum threshold, the EVX-2 will shut down all motor output. The LED on the
speed control will slowly blink red, indicating a low voltage shutdown. The EVX-2
will stay in this mode until a fully charged battery is connected.

Your model includes Power Cell NiMH batteries. The EVX-2 speed control’s Low
Voltage Detection has been disabled for best performance with this battery. The
speed control’s LED will glow red when it is turned on, indicating Low Voltage
Detection is disabled. Be certain to activate Low-Voltage Detection if you install
LiPo batteries in your model. Never use LiPo batteries while Low-Voltage

Detection is disabled.

Verify that Low-Voltage Detection is DISABLED:

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

2. Connect fully charged battery packs to the EVX-2.

3. Press and release the EZ-Set button to turn the EVX-2 on. If the LED is solid red,
then the Low-Voltage Detection is DISABLED (not safe to use LiPo batteries).
If the LED is solid green, then Low-Voltage Detection is ACTIVATED.

To activate Low-Voltage Detection (LiPo setting):

1. Make sure the LED on the EVX-2 is on and shines red.

2. Press and hold the EZ-Set button (the

A

B

LED will turn off) (A). After ten seconds,
the motor will beep twice and the LED
will shine green. Release the button (B).

3. Low-Voltage Detection is now ACTIVATED.

Red LED: Hold 10 seconds 2 Beeps: LED shines green

To disable Low-Voltage Detection (NiMH setting):

1. Make sure the LED on the EVX-2 is on and shines green.

2.

Press and hold the

EZ-Set

button (the

A

B

LED will turn off) (A). After ten seconds,
the motor will beep three times and the
LED will shine red. Release the button (B).

3. Low-Voltage Detection is now DISABLED.

Transmitter Adjustments for the EVX-2 ESC

Before attempting to program your EVX-2, it is important to make sure your TQi

Green LED: Hold 10 seconds 3 Beeps: LED shines red

transmitter is properly adjusted (set back to the factory defaults). Otherwise, you
may not get the best performance from your speed control.

The transmitter should be adjusted as follows:

1. Turn transmitter off.

2. Hold both MENU and SET.

3. Turn transmitter on.

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

5. Press MENU once. The transmitter LED will blink red twice repeatedly.

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

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

1. Disconnect each of the motor wires between the EVX-2 and

A

the motors. This is a precaution to prevent runaway when the
speed control is turned on before it is programmed.

2. Connect two fully charged battery packs to the EVX-2.

3. Turn on the transmitter (with the throttle

at neutral).

B

Green then Red

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

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

5. When the LED blinks RED ONCE. Pull the

throttle trigger to the full throttle position

Once Red

C

and hold it there (B).

6. When the LED blinks RED TWICE. Push the

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

7. When the LED blinks GREEN ONCE, programming is

Twice Red

D

complete. The LED will then shine green or red (depending
on Low-Voltage Detection setting) indicating the EVX-2 is on
and at neutral (D).

Solid

EVX-2 Operation

To operate the speed control and test the programming, place the vehicle on a
stable block or stand so all of the driven wheels are off the ground. Reconnect the
motor wires. Always make sure that objects and fingers are clear of the wheels.

Note that in the steps below, Low-Voltage Detection is DISABLED (factory default) and the
LED shines red. If Low-Voltage Detection is ACTIVATED, the LED will shine green instead of
red in the steps below. Never use LiPo batteries while Low-Voltage Detection is disabled.

1. With the transmitter on, press the EZ-Set button for ½ second, until the LED

shines red, then immediately release the button. This turns on the EVX-2. If you
press and release too quickly, you may hear the steering servos jump but the
LED may not stay on. (Note: If the throttle is not at neutral or if the throttle trim
has been altered, the LED will turn off after one second and the wheels may
begin to drive.)

2. Apply forward throttle. The LED will turn off until full throttle power is reached.

At full throttle, the led will shine red.

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 red.

ADJUSTING THE ELECTRONIC SPEED CONTROL

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

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 red.

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 EVX-2 off, press the EZ-Set button until the red LED turns off.

Thermal Shutdown Protection

The EVX-2 is equipped with thermal shutdown protection to guard against
overheating caused by excessive current flow. If the operating temperature exceeds
safe limits, the EVX-2 will automatically shut down and the EVX-2 LED will flash red.
The LED on the face of the EVX-2 will continuously flash red, even if the throttle
trigger is moved back and forth. After the speed control cools down to a safe level,
the LED will continuously shine red. The EVX-2 will once again function normally.

EVX-2 Profile Selection

The speed control is factory set to Profile #1. To change the profile, follow
the steps on described below. The speed control should be connected to the
receiver and battery, and the transmitter should be adjusted as described
previously. The profiles are selected by entering the programming mode.

EVX-2 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

Selecting Sport Mode (Profile #1)

1. Connect two fully charged battery packs to

A

B

the EVX-2 and turn on your transmitter.

2. With the EVX-2 off, press and hold the EZ-Set

button until the light turns solid green,
then solid red and then begins blinking red
(indicating the Profile numbers).

Green to Red to Off

C

One blink Red

D

3. When the light blinks red once, release the

EZ-Set button.

4. The LED will blink and then turn solid green

(Low-Voltage Detection ACTIVE) or red (Low-

Release

Solid

Voltage Detection DISABLED). The model is ready to drive.

Selecting Race Mode (Profile #2)

1. Connect two fully charged battery packs to

A

B

the EVX-2 and turn on your transmitter.

2. With the EVX-2 off, press and hold the EZ-Set

button until the light turns solid green,

Green to Red to Off

Two blinks Red

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

3. When the light blinks red twice, release the

C

D

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.

Release

A

Solid

B

Selecting Training Mode* (Profile #3)

1. Connect two fully charged battery packs to the
EVX-2 and turn on your transmitter.

2. With the EVX-2 off, press and hold the EZ-Set
button until the light turns solid green,

Green to Red to Off

C

Three blinks Red

D

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

3. When the light 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.

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

LED Codes and Protection Modes

• Solid Green: EVX-2 power-on light. Low-Voltage Detection is ACTIVATED

(LiPo setting).

• Solid Red: EVX-2 power-on light. Low-Voltage Detection is DISABLED

(NiCad/NiMH setting). Never use LiPo batteries while Low-Voltage Detection

is disabled.

• Fast Blinking Red: The EVX-2 is equipped with thermal shutdown protection

to guard against overheating caused by excessive current flow. If the operating
temperature exceeds safe limits, the EVX-2 will automatically shut down. Let
the EVX-2 cool. Make sure your model is properly geared for the conditions (see
page 24).

• Slow Blinking Red (with Low-Voltage Detection on): The EVX-2 has entered

Low-Voltage Protection. When the battery voltage begins to reach the
minimum recommended discharge voltage threshold for LiPo battery packs,
the EVX-2 will limit the power output to 50% throttle. When the battery voltage
attempts to fall below the minimum threshold, the EVX-2 will shut down all
motor output. The LED on the speed control will slowly blink red, indicating a
low-voltage shutdown. The EVX-2 will stay in this mode until a fully charged
battery is connected.

• Fast Blinking Green: The EVX-2’s LED will blink fast green if Throttle Neutral

Protection is activated, or 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 this does not restore normal operation, then the
EVX-2 is indicating the transmitter’s Throttle Trim (see page 13) is incorrectly
set. Reset the throttle trim to the “0” position.

Patent Pending 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 or Race Mode for full­power operation.

Tip For Fast Mode Changes

The EVX-2 is set to Profile 1 (Sport
Mode) as the default. To quickly
change to Profile 3 (Training
Mode), with the transmitter on,
press and hold the SET button until
the light blinks red three times and
then release. For full power, quickly
change back to Profile 1 (Sport
Mode) by pressing and holding the
SET button until the light blinks red
one time and then releasing.

Throttle Neutral Protection
Your model’s EVX-2 speed control
also features Throttle Neutral
Protection. If the transmitter’s
throttle trim setting is changed
while the speed control is
switched off, Throttle Neutral
Protection prevents the speed
control from activating the motor
until the throttle trim is corrected.
Throttle Neutral Protection
also 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 EVX-2
will operate properly.

*Patent-pending

E-MAXX • 17

DRIVING YOUR MODEL

18 • E-MAXX

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 motors..

•

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.

•

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

•

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 which may
loosen hardware over time. Frequently check wheel nuts and other
screws on your vehicle to ensure that all hardware remains properly
tightened.

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

9

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 which 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 EVX-2 cool.

•

Lower your gear ratio. Installing smaller pinion gears will lower your
gear ratio and cause less power draw from the motors and batteries,
and reduce overall operating temperatures. Always replace both
pinion gears together.

•

Vary your speed. Continuous high-speed, high-gear running shortens
the run time on the E-Maxx.

•

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

mAh Ratings and Power Output

The mAh rating of the battery can effect 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 sinks.

RUNNING IN WET CONDITIONS

Your new Traxxas E-Maxx 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 E-Maxx
through puddles, wet grass, snow, and through other wet conditions.
Though highly water resistant, the E-Maxx 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

DRIVING YOUR MODEL

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 Traxxas TQi 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 salt water (ocean
water), brackish water (between fresh water and ocean water), or
other contaminated water. Salt water 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 motors. Special
care must be taken to modify your gearing and/or your driving style
in wet conditions to extend the life of the motors (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 if holes are not cut in the tires. Cut two small
holes (4mm or 3/16” diameter) in each tire. Each hole should be near
the tire centerline, 180 degrees apart.

3.

Confirm that the RX box O-ring and cover are installed correctly and
secure. Make sure the screws are tight and the blue O-ring is not
visible protruding from the edge of the cover.

4.

Confirm that your batteries can be used in wet conditions.

5.

Use lower gearing (smaller pinion gears, as low as 12T) when running
in mud, deep puddles, snow, or other similar situations that will
restrict the tires and put much higher loads on the motors.

Motor Precautions

•

Titan motor life can be greatly reduced in mud and water. If the
motors get excessively wet or submerged, use very light throttle (run
the motors 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 wet motors. Do not
submerge the motors under water.

•

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

After Running Your Vehicle in Wet Conditions

1.

Drain the tires by spinning the tires at full throttle to “sling” the water

out. An easy way to do this is to remove the body and set the truck
upside down on a flat surface. Apply full throttle so the tires spin and
throw the excess water out of the holes you cut into the tires.

2.

Remove the batteries.

3.

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

4.

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

5.

Remove the wheels from the truck

6.

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

7.

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.

8.

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.

E-MAXX • 19

DRIVING YOUR MODEL

9.

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.

• Stub axle housing bearings: Remove, clean, and re-oil the bearings.

• Front and rear differential: Remove,
disassemble, clean, and re-grease
the differentials. 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
wheel bearing grease (from an auto
parts store) 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 motors: Remove the motors, 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.

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 two 3x10mm button-head
cap screws.

2.

To remove the receiver from the box simply lift it out 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 2.8x8mm cap screws.

4.

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

Receiver Installation

1.

Always install the wires into the RX 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.

4.

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

5.

Install the wire clamp and tighten the two

2.8x8mm cap screws securely.

6.

Install the receiver into the box and plug the wires into receiver.

Refer to page 10 for the wiring diagram.

7.

Make sure the clear plastic

light pipe in the receiver box
is aligned above the LED on
the receiver.

8.

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 any way.

9.

Install the cover and tighten the two 3x10mm button-head cap

screws securely.

10.

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

20 • E-MAXX

TUNING ADJUSTMENTS

SUSPENSION TUNING

Adjusting the Pivot Ball Caps

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

Caster Adjustment

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

Caster adjustment shims (2 Front)

Vertical

Ground plane

4

Caster adjustment shims (1 Front, 1 Rear)

Vertical

Ground plane

7

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

Fine Tuning the Shocks

The eight shocks (oil dampers) on your E-Maxx have tremendous
influence on its handling. Whenever you rebuild your shocks, or make
any changes to the pistons, springs or oil, always do it carefully and in
sets (front or rear). Piston head selection depends on the range of oil
viscosities that you have available. For example, using a two-hole piston
with lightweight oil will give you the same damping as a three-hole
piston with heavier oil.

Caster adjustment shims (2 Rear)

10

Ground plane

Vertical

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

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

Shock Mounting Positions

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

Upper shock mounting position
(A) should generally be used
with lower shock mounting
positions 1 and 2. Upper shock
mounting position (B) should
be generally be used with lower
shock mounting positions 3 and

4. The innermost upper shock
mounting position (0) can be
used for tuning with the inner
pair of lower shock mounting
positions on the arm (1,2). It
is not compatible with lower
shock mounting positions 3 and

4. Other combinations may be
used to achieve individualized
suspension settings.

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

E-MAXX • 21

0

TUNING ADJUSTMENTS

Lower Shock Mounting Positions

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

The inner pair of holes on the lower suspension arm should
be used to increase the ride height of the E-Maxx. The more vertical
position of the shocks will allow for lower shock progression and the
soft, plush feel that’s characteristic of a Traxxas Maxx Truck.

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

Ride height decreases as the lower shock mounting position is
moved from position (1) to position (4). Each pair of lower shock

Wheel Force vs. Wheel Travel

2.5

2

1.5

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

mounting holes (1,2 and 3,4) has equal ride height. Use lower ride
height for high-speed cornering and flat terrain, and when racing on
relatively smooth tracks. Increase the ride height for rougher terrain
and tracks.

Upper Shock Mounting Positions

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

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

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

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

Lower Mount 4

Lower Mount 3

More Firm

Lower Mount 2

Lower Mount 1

22 • E-MAXX

1

Wheel Force (lb)

Less Firm

0.5

0

0102030406070809010

50

Wheel Travel (mm)

TUNING ADJUSTMENTS

ALIGNMENT SETTINGS

Adjusting the Toe-in

Your E-Maxx comes from the factory with
zero degrees of toe-in in the front, and
one degree of toe-in in the rear. You can
adjust the toe-in on the front and rear of
the truck. Set the steering trim on your
transmitter to neutral. Next, adjust your
steering turnbuckles so that both front
wheels are pointing straight ahead and
are parallel to each other (0 degrees toe-
in). This will ensure the same amount of
steering in both directions. Adjust the
rear toe control links so that the rear
wheels have 1˚ of toe-in.

Static Camber Adjustment

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

The suspension pivot balls located in the axle
carriers adjust the static camber. The pivot
balls are protected by blue dust plugs. To
adjust your static camber, insert the supplied

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

Positive Camber Negative Camber

Right Hand
(Normal) Threads

Left Hand
Threads

Decrease

Length

Increase

Length

Static Camber Base
Factory Settings

Front: 1-degree negative

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

TRANSMISSION TUNING

Adjusting the Slipper Clutch

The E-Maxx is
equipped with an
adjustable Torque

Tighten

Control slipper
clutch which is built
into the large spur
gear. The purpose
of the slipper clutch

Loosen

is to regulate the amount of power sent
to the rear wheels to prevent tire spin. When
it slips, the slipper clutch makes a high-pitch,
whining noise.

To adjust the slipper clutch, remove the rubber
slipper clutch plug on the transmission cover. The slipper clutch is
integrated into the main spur gear on the transmission. The slipper
clutch is adjusted using the spring-loaded locknut on the slipper
shaft. Use the supplied universal wrench. To tighten or loosen the
slipper nut, insert the 2.0mm hex wrench into the hole in the end
of the slipper shaft. This locks the shaft for adjustments. Turn the
adjustment nut clockwise to tighten (less slippage) and counter­clockwise to loosen (more slippage).

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. The diameter of the wheels is an
innovative design, and there is a variety of different tires available
for you to experiment with in addition to the included tires on the
model (listed in your parts list). Experimentation with different
types of tires is recommended to see which ones work the best on
the terrain where the model is run. When selecting tires, consider
the overall diameter and the rubber compound (hard or soft). If
the overall diameter of the tire is significantly increased, you will
need to use a smaller pinion gear to compensate for the larger tire.
Soft compound tires with many short spikes generally work better
on hard, dry surfaces. In loose dirt, a tire with large spikes should
perform better. See your parts list for accessory wheels and tires.

To achieve a good starting
point for the slipper clutch,
tighten the slipper clutch
adjusting nut clockwise until
the slipper clutch adjusting
spring fully collapses (do not
over tighten), and then turn
the slipper clutch nut counter­clockwise ¼ to ½ turn.

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

Front of Truck

Left Hand Thread

Indicator

Left Side

Front of Truck

Left Hand Thread

Indicator

Right Side

E-MAXX • 23

TUNING ADJUSTMENTS

Gearing Compatibility Chart:

The chart below shows 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.

Spur Gear

62 65 68

12

- - 29.57

13

- - 27.29

14

- 24.23 25.34

15

- 22.61 23.65

16

- 21.20 22.18

17

19.03 19.95 20.87

Pinion Gear

18

17.97 18.84 19.71

19

- 17.85 18.67

20

- - 17.74

21

- - -

22

- - -

Stock factory gearing

Not for 14-cell
battery running

Not recommended

MOTORS AND GEARING

The Titan™ 550 Motors on your E-Maxx have been carefully designed
to match the needs of the E-Maxx. The Titans are made to run
efficiently at high voltage to provide more torque and longer run
times. We do not recommend converting the E-Maxx to a typical
low voltage setup using traditional 540 size motors. While these
components will physically fit into the E-Maxx, 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. If you are considering replacement
motors, look for 550 motors capable of 12 or more volts.

The E-Maxx is equipped from the factory with a 68-tooth spur gear
and 17-tooth pinion gears. E-Maxx 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 motors,

do not use a pinion gear larger than 20-tooth with the stock 68-
tooth spur gear with 6-cell battery packs or a pinion gear larger
than 19-tooth with the stock 68-tooth spur gear when using 7-cell
battery packs. Use the following formula to calculate the overall ratio

for combinations not listed on the gear chart:

# Spur Gear Teeth

# Pinion Gear Teeth

Going Brushless

Brushless motors provide increased power output and greater
efficiency. The E-Maxx is designed with extra transmission and
driveline strength to make it capable of handling extreme brushless
power. One or two brushless motors may be used. A specially
designed motor plate (part # 3997X) and gear cover (part # 3977X)
are available for optimized, single-motor installations. If you plan
to run LiPo battery packs to power a LiPo-compatible brushless
system, optional battery hold downs (part # 3927X) are available to
accommodate larger, high capacity 2S and 3S LiPo battery packs.

x 5.22 = Final Gear Ratio

Adjusting Gear Mesh

Incorrect gear mesh is the most
common cause of stripped spur
gears. Gear mesh should be
checked and adjusted anytime
a gear is replaced. Access the
gears by removing the single
screw on the top gear cover.

To set the gear mesh, cut a
narrow strip of notebook paper
and run it into the gear mesh.

Motor

Screws

Strip of

Paper

Loosen the motor screws and
slide a motor and pinion gear
into the spur gear. Retighten
the motor screws and then
remove the strip of paper.
Repeat with the other motor.
You should be able to run a
fresh strip of paper through the
gears without binding them.

DUAL STEERING SYSTEM

Your new E-Maxx uses dual-servo steering and a single heavy-duty
servo saver for powerful, responsive steering. To prevent damage
to the steering servos, it is important to make sure that the servos
are “at rest” when the steering is at neutral. If one servo is out of
adjustment, then both servos will work against each other, fighting
to find center.

Center

Drag Link

Servo Horn

Toe Link

Bellcrank

Servo Horn

Servo Saver

24 • E-MAXX

Toe Link

TUNING ADJUSTMENTS

Adjusting the Steering System

1. Disconnect the short steering link that connects the servo saver
to the servo horn.

2. Remove the drag link that connects the two servo horns.

3. Remove the servo horns

4. Connect a pair of charged batteries to the ESC. Turn on the
transmitter, then the ESC. Note: It is recommended to unplug
the motors or remove the pinion gears during steering setup.

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

6. Install both servo horns. Make sure they are parallel to the
center line of the chassis (pointing to the rear of the truck).

7. Connect the short steering link from the servo saver to the
servo horn. Make sure the servo saver is parallel to the center
line of the chassis (also parallel to the servo horns). If not,
make small adjustments to the length of the link so the
everything is parallel.

10. Connect the center drag link to one of the steering servos.
Check for alignment with the holes in the second steering link.
If these do not line up, make small adjustments to the length of
the link until the holes line up.

11. Connect the center drag link to the second steering
servo horn.

12. If necessary, fine tune the length of the center link to eliminate
any load on the steering system in the neutral position.

If you are using aftermarket servos, it is important to use servo
horns designed for E-Maxx. Optional steering servo horns are sold
separately for use with non-Traxxas servos.

8. The steering should operation correctly with equal travel left
and right. Now connect the second servo.

9. Confirm the length of the center drag link (89.5mm - see
template, below).

Center Drag Link

89.5mm

E-MAXX • 25

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.

11. Check the tightness of the front pivot balls.

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 1.8mm
or less, the friction disc
should be replaced.
Measure the pad
thickness using calipers
or measuring against
the diameter of the 1.5 and

2.0mm hex wrenches provided
with the model.

• Chassis: Keep the chassis clean of

accumulated dirt and grime. Periodically inspect
the chassis for damage.

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

• 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
bladder 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 #2362.

• Suspension: Periodically inspect the model for signs of damage
such as bent or dirty suspension pins, bent turnbuckles, loose
screws, and any signs of stress or bending. Replace components
as needed.

• Driveline: Inspect the driveline for signs of wear such as worn
drive yokes, dirty axle half shafts, and any unusual noise or
binding. Remove the gear cover and Inspect the spur gear for
wear and check the tightness of set screws in the pinion gears.
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.

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

1-888-TRAXXAS

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

26 • E-MAXX

10

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
Steering Sensitivity by default, see page 15). 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 29. Experiment with the settings and features to see if
they can improve your driving experience.

Throttle Sensitivity (Throttle Exponential)

The Multi-Function knob can be set to control Throttle Sensitivity.
Throttle Sensitivity works the same way as Steering Sensitivity as
described on page 15, 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
counter-clockwise reduces steering throw (note: turning the dial
counter-clockwise 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
Multi-Function 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
counter-clockwise 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.

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.

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.

Starting Over:

Restoring Factory Defaults

When programming your

2.4GHz transmitter, you may
feel the need to start over with
a clean slate. Follow these
simple steps to restore the
factory settings:

1. Turn transmitter off.

2. Hold both MENU and SET.

3. Turn transmitter on.

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

5. Press MENU once. The
transmitter LED will blink red
twice repeatedly.

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

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 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.

E-MAXX • 27

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 the receiver
will rapidly flash red.

28 • E-MAXX

Model Lock

The Traxxas Link Model Memory feature can store up to twenty models
(receivers) in its memory. If you bind a twenty-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 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 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.

TRANSMITTER LED CODES

LED Color / Pattern Name Notes

Solid green Normal Driving Mode See page 13 for information on how to use your transmitter controls.

Slow red (0.5 sec on / 0.5 sec off) Binding See page 14 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 11 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

Turn the Multi Function knob right or left until the LED stops flashing.
See page 27 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 (ie out of
range, low batteries, damaged antenna).

RECEIVER LED CODES

LED Color / Pattern Name Notes

Solid green Normal Driving Mode See page 13 for information on how to use your transmitter controls.

Slow red (0.5 sec on / 0.5 sec off) Binding See page 14 for more information on binding.

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

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

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
Dual Rate has been selected.

4. Press MENU twice. The red LED will blink three times repeatedly to
indicate Steering Percentage 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

Hold both

MENU and SET

Transmitter ONRelease MENU and

SET. Red LED blinks

Press MENU once.

Red LED

blinks twice

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 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

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

SET

Press

SET

Press

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 endpoint 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 endpoint 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

Confirm 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 endpoints.

Press SET to reverse
servo direction.

Use knob to adjust sub­trim. 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 endpoints.

E-MAXX • 29

TQi ADVANCED TUNING GUIDE

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

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

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

x

Press MENU

green LED blinks (x2)

x

Press MENU

green LED blinks (x2)

x

Press MENU

green LED blinks (x2)

x

Press MENU

green LED blinks (x2)

x

Press MENU

green LED blinks (x2)

x

Press MENU

green LED blinks (x2)

x

Press MENU

green LED blinks (x2)

x

Press MENU

green LED blinks (x2)

Press SET to confirm

green LED blinks (x8)

Press MENU to confirm

red LED blinks (x2)

Press MENU twice

red LED blinks (x3)

Press MENU 3 times

red LED blinks (x4)

Press MENU 4 times

red LED blinks (x5)

Press MENU 5 times

red LED blinks (x6)

2

2

2

2

2

2

2

2

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

x

8

returns to driving mode

x

2

x

3

x

4

x

5

x

6

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

Press/hold MENU

Press SET to select

green LED blinks (x8)

Press SET to select

green LED blinks (x8)

Press SET to select

green LED blinks (x8)

Press SET to select

green LED blinks (x8)

Press SET to lock

green LED blinks (x8)

green LED blinks (x2)

green LED blinks (x2)

green LED blinks (x2)

green LED blinks (x2)

x

8

returns to driving mode

x

8

returns to driving mode

x

8

returns to driving mode

x

8

returns to driving mode

x

8

returns to driving mode

x

2

x

2

x

2

x

2

Press/hold MENU

Press/hold MENU

Press/hold MENU

Press/hold MENU

Press/hold MENU

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

Function knob until the

LED turns solid green.

8

returns to driving mode

2

Use Multi-Function

knob to set neutral

3

wheel to desired max

left and right travel

4

to reset end points

Press SET to reverse

Press MENU 3 times

Adjust the Multi-

Press/hold MENU

Turn steering

Press SET

servo direction

Press MENU

red LED blinks (x2)

Press MENU twice

red LED blinks (x3)

red LED blinks (x4)

x

8

x

8

x

2

x

3

x

4

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 SET

to save position

x

Press SET

to save each position

Press/hold MENU

returns to driving mode

Press/hold MENU

returns to driving mode

Use Multi-Function

knob to set neutral

Use throttle

trigger to set desired

max throttle or brake

Press SET

green LED blinks (x8)

returns to driving mode

8

x

8

returns to driving mode

Press/hold MENU

Turn steering wheel

to test settings

x

Press SET

to save position

Press SET to save

Use trigger to test

Press/hold MENU

IF END POINTS

ARE OK:

Press/hold MENU

returns to driving mode

8

Press/hold MENU

returns to driving mode

IF END POINTS

ARE OK:

Press/hold MENU

returns to driving mode

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

.

TQi ADVANCED TUNING GUIDE

PROGRAMMING YOUR TQi TRANSMITTER
WITH YOUR APPLE iPHONE OR iPOD TOUCH

The Traxxas Docking Base (Part #6510 - sold separately) for the TQi
transmitter installs in minutes to transform your iPhone
into a powerful tuning tool that allows you to replace the transmitter’s
button/LED programming system with an intuitive, high-definition, full­color graphical user interface.

®

or iPod touch®

Traxxas Link

The powerful Traxxas Link app (available in the Apple App Store) 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.

Intuitive iPhone
and iPod touch 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,

Real-Time Telemetry

Throttle Trim, Braking Percent, and more!

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.

The TQi Docking
Base is sold separately
(Part #6510). The Traxxas
Link application is
available from the Apple
App store for iPhone
and iPod touch mobile
devices. iPhone and iPod
touch are not included
with the TQi Docking Base.

For more information
about the TQi Docking
Base and the Traxxas
Link application, visit

Traxxas.com

Made for

· iPod touch (4th generation)

· iPod touch (3rd generation)

· iPod touch (2nd generation)

· iPhone 4S

· iPhone 4

· iPhone 3GS

· iPhone 3G

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, and start having fun.

“Made for iPod” and “Made for iPhone” mean that an electronic accessory has been designed to connect specically to iPod and iPhone, respectively, and has
been certied by the developer to meet Apple performance standards. Apple is not responsible for the operation of this device or its compliance with safety and
regulatory standards. Please note that the use of this accessory with iPod and iPhone may affect wireless performance.

iPhone and iPod touch are trademarks of Apple Inc., registered in the U.S. and other countries.

E-MAXX • 31

120529 KC1431-R04

owners manual

MODEL 3903

1100 Klein Road, Plano Texas 75074

1-888-TRAXXAS