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Centering Your Servo
If you have removed the servo horn from your model's steering servo,
or the servo has been removed for service or cleaning, the servo must
be re-centered prior to installation of the servo horn or installation of
the servo in the model.
1. Remove 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. The white wire on
the servo lead is positioned toward the receiver's LED.
3. Place fresh "AA" batteries in the transmitter and turn the
transmitter power switch on.
4. Turn the transmitter's steering trim knob to the center "0" position.
5. Disconnect the motor wires (see page 12) to prevent the motor
from turning during the next steps.
6. Connect a fresh battery pack to the speed control and turn on the
ESC (see page 19). The servo's output shaft will automatically jump
to its center position.
7. Install the servo horn onto the servo output shaft. The servo horn
should face toward the center of the chassis and be perpendicular
to the servo body.
8. Check servo operation by turning the steering wheel back and
forth to ensure that the mechanism has been centered properly
and you have equal throw in both directions. Use the transmitter's
steering trim knob to fine-tune the position of the servo horn so
the model tracks straight when the steering wheel is at neutral.
Motors and Gearing
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
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:
# Spur Gear Teeth
x 2.85 = Final Gear Ratio
# Pinion Gear Teeth
ADJUSTING YOUR MODEL
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 BL-2s 3300kV 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 optional high-speed gearing (more teeth;
sold separately). The optional high-speed gearing is intended for
high-speed running on hard surfaces, and is not recommended for
off-road or repetitive starting and stopping.
The BL-2s 3300kV motor 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.
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 wheels to prevent tire spin.
When it slips, the slipper clutch makes a high-pitch, whining noise. To
adjust the slipper, remove the slipper gear assembly from your model
(see page 29 for instructions), and turn the adjusting nut clockwise
to tighten or counterclockwise to loosen. Adjust the slipper so that
you can hear it slip for a moment from a standing, full throttle start.
(Learn more about adjusting the slipper clutch in the sidebar.)
To achieve a good starting
point for the slipper clutch
in this model, remove the
slipper gear assembly from
your model (see page 22 for
instructions) and 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.
FIESTA ST RALLY • 25
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