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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. Items in
black will fit 540 motors only (not Titan
12T). Items in color show the acceptable
ranges.
Spur Gear
76
83
86
90
12
-
-
-
20.40
13
-
-
-
18.83
14
-
-
-
17.49
15
-
-
15.59
16.32
16
-
-
14.62
15.30
17
-
-
13.76
14.40
18
-
12.54
13.00
13.60
19
-
11.88
12.31
12.88
20
-
11.29
11.70
12.24
21
-
10.75
11.14
11.66
22
-
10.26
10.63
11.13
Stock
(recommended for most conditions)
Included optional
Usable range
High speed, hard surfaces only
Not recommended
-
Does not fit
24 • TRAXXAS
ADJUSTING YOUR MODEL
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 2.72 = 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 the included high-speed gearing (more teeth). If
you want more acceleration and less top speed, use a smaller optional
(not included) pinion gear. The included high-speed gearing is
intended for high-speed running on hard surfaces, and this gearing
is not recommended for off-road or repetitive starting and stopping.
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
• Fast Acceleration
stopping over short distances
• Short Distances
creates excess heat and will
• Small Tracks
not allow the fan to cool the
• Good Acceleration
motor properly. For this type of
• Good Speed
driving, smaller pinion gears are
• Normal Conditions
recommended to reduce load
• High Top Speed
on the motor. See the guide to
• Long Distances
the right.
• Hard Surfaces
Adjusting Gear Mesh
Incorrect gear mesh is the most common
cause of stripped spur gears. To set
the gear mesh, cut a narrow strip of
notebook paper and run it into the gear
mesh. Loosen the motor screws and
slide the motor and pinion gear into the
spur gear. Retighten the motor screws
and then remove the strip of paper.
You should be able to run a fresh strip
of paper through the gears without
binding them.
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 rear wheels of the model. Connect a fresh 7.2V battery
pack to the speed control and turn on the ESC (see page 17). 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.
14-Tooth Pinion*
90-Tooth Spur
16-Tooth Pinion
90-Tooth Spur
21-Tooth Pinion
90-Tooth Spur
*optional (sold separately)
Strip of
Paper
Motor
Screws
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