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Gearing Compatibility Chart:
The chart below shows
recommended gear combination
ranges for your model.
Spur Gear
50
52
54
9
-
-
17.10
10
-
-
15.39
11
-
13.47
13.99
12
-
12.35
12.83
13
10.96
11.40
11.84
14
10.18
10.59
10.99
15
9.50
9.88
10.26
16
8.89
9.25
9.62
17
8.37
8.71
9.05
18
7.91
8.22
8.55
19
7.50
7.80
8.10
20
7.13
7.41
7.70
21
6.79
7.06
7.33
22
6.48
6.75
-
23
6.20
6.45
-
24
5.94
-
-
25
5.70
-
-
26
-
-
-
Preferred gearing for off-road and extreme
terrain, 3s LiPo
Out of Box Setup, recommended for most
running, 6 or 7-cell NiMH, 2s LiPo
Recommended for high-speed running on
smooth hard surfaces only
Included optional gearing, for high-speed
running only
Fits, for high-speed runs only, not
recommended for use with NiMH batteries
High-current LiPo batteries required.
Doesn't fit
28 • FIESTA ST RALLY VXL
ADVANCED TUNING ADJUSTMENTS
GEARING
One of the more significant advantages to your model's transmission
is the extremely wide range of available gear ratios. Changing the
gearing allows you to fine tune the speed of the model and control
the temperatures of the battery pack and motor. Use a lower gear ratio
(numerically larger) to reduce current draw and temperatures. Use a
higher gear (numerically lower) to increase top speed. 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
When using higher gear ratios, it is important to monitor the
temperatures of the battery and motor. If the battery is extremely
hot (150°F) and/or the motor is too hot to touch (200°F), your
model is probably over-geared and drawing too much current. 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. Note:
Check and adjust gear mesh if a spur and/or pinion gear is changed.
This model is equipped with a Velineon 3500 motor. The gear
combination that comes stock on each model provides good overall
acceleration and top speed. If you want more top speed, install the
included optional large pinion gear (more teeth). 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.
LIPO BATTERIES
LiPo batteries are intended only for the most advanced users that are
educated on the risks associated with LiPo battery use. It is critical to
follow all instructions supplied by the battery manufacturer and the
charger manufacturer for proper charging, use, and storage of LiPo
batteries. Make sure you understand how to use your LiPo batteries.
See Safety Precautions and warnings on page 4 for more information.
TEMPERATURES AND COOLING
Monitoring temperatures will extend the lives of the batteries and
motors. There are many options available that will help you monitor
temperatures and cool your components .
Temperature sensor
To accurately monitor motor temperature and
prevent overheating, a telemetry temperature
sensor (part #6523) can be installed on the
motor to continually monitor temperature as
you drive. Generally, try to keep your motor
below 200° F. If necessary, increase airflow to
the motor by cutting out the rear of the body
or windshield.
Heat sink cooling fan
The VXL-3s is equipped with an additional
connector to supply power to an optional heat
sink cooling fan (part #3340). The optional heat
sink cooling fan can assist in cooling the VXL-3s
in high current motor applications.
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