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7. Turn off the power to the model followed by the transmitter. The
servo horn is now ready to be installed.
8. Be careful not to move the servo shaft when installing the servo
horn. Readjust the ESC as described in the "Adjusting the Electronic
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.
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).
ADJUSTING YOUR MODEL
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.
Tuning the Sealed Gear Differentials
The action of the model's front and rear gear differentials can
be tuned for different driving conditions and performance
requirements, without major disassembly or removal of the
suspension system.
From the factory, the differentials are sealed to maintain consistent
long-term performance. Changing the oil in the differential with
either lower or higher viscosity oil will vary the performance
characteristics of the differentials. Changing to a higher viscosity oil
in the differential will reduce the tendency for motor power to be
transferred to the wheel with the least traction. You may notice this
when making sharp turns on slick surfaces. The unloaded wheels
on the inside of the turn have the least traction and tend to spin
up to extremely high rpms. Higher viscosity (thicker) oil causes the
differential to act like a limited-slip differential, distributing more
equal power to the left and right wheels.
Your model will generally benefit from higher viscosity oil when
racing on low traction surfaces. Note: Heavier oil will allow power to
be transferred even with one or more tires off the ground. This can
make the vehicle more likely to overturn on high-traction surfaces.
From the factory, the front differential is filled with SAE 30,000W
viscosity silicone oil and the rear differential is filled with SAE
10,000W viscosity silicone oil.
Only use silicone oil in the differentials. Traxxas offers SAE 10,000W,
30,000W, and 50,000W viscosity oil (see your parts list). The
differentials have to be removed from the vehicle and disassembled
to change/replace oil.
Follow the steps on the next page to access and refill the front and
rear differentials.
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
70
19
3.68
20
3.50
21
3.33
22
3.18
23
3.04
24
2.92
25
2.80
26
2.69
27
2.59
28
2.50
29
2.41
Out of box setup, recommended
for most running, 7-cell NiMH
or 2S LiPo
Included optional gearing,
for high-speed running only
Usable gearing range for
7-cell NiMH or 2s LiPo
Fits, for high-speed running
only
TRAXXAS • 25
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