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Adjusting Your Model
Adjusting the Slipper Clutch
The model is equipped with an
adjustable slipper clutch which
is built into the large spur gear.
The purpose of the slipper
clutch 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. Remove the rubber slipper clutch plug
on the transmission cover in order to adjust the slipper. Use the
4-way wrench to turn the adjusting nut clockwise to tighten and
counter-clockwise to loosen. Place the model on a high-traction
surface, such as carpet. Adjust the slipper so that you can hear it
slip for approximately two feet from a standing, full throttle start.
(Learn more about adjusting the slipper clutch in the sidebar.)
Motor and Gearing
There are two different types of aftermarket motor which can be
purchased for your model, stock and modified. Stock motor 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 motor are more
expensive, may feature ball bearings and come in a variety of wire
thicknesses and 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 motor.
Modified motor should be geared lower (higher numerically) than
stock motor because they reach their maximum power at higher
RPM’s. 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:
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 each model provides good overall
acceleration and top speed. If you want more top speed and less
acceleration install the included optional large pinion gear (more
teeth). If you want more acceleration and less top speed, use a
smaller optional (not included) pinion gear.
The included optional
large pinion gear 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 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.
Gearing Compatibility Chart
The chart to the right 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 motor only
(not Titan 12T).
Tighten
Loosen
# Spur Gear Teeth
x 2.72 = Final Gear Ratio
# Pinion Gear Teeth
Spur Gear
Pinion Gear
83
86
90
15
15.04
-
-
16
14.12
14.63
-
17
13.27
13.76
14.39
18
12.54
13.00
13.60
19
11.89
12.32
12.89
20
11.28
11.69
12.24
21
10.75
11.14
11.66
22
10.25
10.63
11.12
23
-
10.17
10.63
24
-
-
10.20
540 motor only
Quick acceleration, less
top speed
Stock
Optimal Range
On-road only
On-road only,
7-cell maximum
• Fast Acceleration
• Short Distances
• Small Tracks
18-Tooth Pinion
90-Tooth Spur*
• Good Acceleration
• Good Speed
• Normal Conditions
18-Tooth Pinion
86-Tooth Spur
• High Top Speed
• Long Distances
• Hard Surfaces
23-Tooth Pinion
86-Tooth Spur
*optional (sold separately)
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 counter-
clockwise one full turn.
Do not run your model with
the slipper clutch adjusting
spring fully compressed. The
minimum recommended
slipper clutch setting is 1/2
turn counter-clockwise from
fully compressed.
