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Centering Your Servo
If the trim controls on your transmitter seem off, you may need to
re-center your servo. Additionally, whenever your servo has been
removed for service or cleaning, it must be re-centered prior to
installation in the model.
1. Disconnect the servo horn from the steering servo.
2. Connect the steering servo to channel 1 on the receiver. Connect
the electronic speed control (ESC) to channel 2.
3. Place fresh "AA" batteries in the transmitter and turn the
transmitter power switch on.
4. Turn the steering trim adjustment on the transmitter to the center
"0" position.
5. Elevate the model on a block or stand so that all of the tires are
off the ground. Connect a fresh battery pack to the speed control
and turn on the ESC (see page 18). The servo will automatically
jump to its center position.
6. Turn off the power to the model followed by the transmitter. The
servo horn is now ready to be installed.
7. Be careful not to move the servo shaft when installing the servo
horn. Readjust the ESC as described in the "Adjusting the Speed
Control" section.
Motors and Gearing
There are two different types of aftermarket motors that can be
purchased for your model, stock and modified. Stock motors all
have the same wire thickness and number of turns around the
armature as governed by sanctioned racing organizations. They
are inexpensive and widely available. Modified motors are more
expensive, may feature ball bearings, and come in a variety of wire
thicknesses and the number of turns of wire on the armature. The
fewer number of turns of wire on the armature, the more powerful
the motor will be. Keep in mind that the more powerful the motor,
the less battery run time you will have.
One of the more significant advantages to your model's transmission
is the extremely wide range of available gear ratios. It can be geared
low enough to run extremely hot, modified motors. Modified motors
should be geared lower (higher numerically) than stock motors
because they reach their maximum power at higher rpms.
ADJUSTING YOUR MODEL
A modified motor that is geared incorrectly can actually be slower
than a correctly-geared, stock motor. Use the following formula to
calculate the overall ratio for combinations not listed on the gear chart:
# Spur Gear Teeth
x 2.85 = Final Gear Ratio
# Pinion Gear Teeth
If you are worried that you might be over-geared, check the
temperature of the battery pack and motor. If the battery is
extremely hot, and/or the motor is too hot to touch, your model is
probably over-geared. If you are not able to run your model for at least
four minutes before the battery dies, then change to a lower gear
ratio. This temperature test assumes that the model is close to factory
stock weight and operates freely with no excessive friction, dragging,
or binding, and the battery is fully charged and in good condition.
The model is equipped with a Titan 12T 550 motor. The gear
combination that comes stock on the model provides good overall
acceleration and top speed. If you want more top speed and less
acceleration, install optional high-speed gearing (more teeth).
If you want more acceleration and less top speed, use a smaller
optional pinion gear (optional gearing not included).
The Titan 12T is equipped with an integrated cooling fan that is
effective during medium to high-speed operation. The gearbox is
specially vented to cool the motor.
Repetitive starting and stopping over short distances creates excess
heat and will not allow the fan to cool the motor properly. For this type
of driving, smaller pinion gears are recommended to reduce load on the
motor. See the guide to the right.
Gearing Compatibility Chart:
The chart below shows a full range
of gear combinations acceptable
for this model. 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
76
83
12
-
19.69
13
-
18.17
14
-
16.87
15
-
15.75
16
-
14.76
17
12.72
13.90
18
12.02
13.12
19
11.38
12.43
20
10.82
11.81
21
10.30
11.25
22
9.83
10.74
23
9.40
10.27
24
9.01
9.84
25
8.65
9.45
26
8.32
9.09
27
8.01
8.75
28
7.73
8.44
Out of box setup, recommended
for most running, 6 or 7-cell
NiMH, 2S LiPo
30+ mph gearing (sold
separately), for high-speed
running only
Usable gearing range for
6- or 7-cell NiMH
Fits, for high-speed runs only,
not recommended for use with
NiMH batteries
Does not fit
TRAXXAS • 25
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