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Brushed Motors
For the ultimate in versatility, the VXL-3s has no motor limit when
used with a brushed motor. This allows you to use any readily
available 540 or 550 size brushed motors in your VXL-3s equipped
vehicle. Always be sure to follow all break in and maintenance
instructions set forth by the motor manufacturer. The VXL-3s
automatically detects what kind of motor it is connected to so no
programming actions are required to use brushed motors. Simply be
sure to properly connect the motor to the speed control as shown.
Optional brushed motor wiring diagram:
• Motor positive (+) should be connected to phase A (blue).
• Phase B is not used.
• Motor negative (-) should be connected to phase C (white).
If the wiring is reversed, the motor will operate in reverse. If the
motor is wired incorrectly (using phases A+B or B+C), the VXL-3s will
send short pulses to the motor and turn off the LED indicating a fail
safe mode. It will not return to normal operation until wired properly.
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 gauge
An on-board temperature gauge such as the
Traxxas part #4091 can aid you in monitoring
your motor temperature. 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.
ADVANCED TUNING ADJUSTMENTS
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.
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
climbing or 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. The rear differential is filled with grease, but can
also be tuned with silicone differential 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.
TRAXXAS RALLY • 25
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