26 • SLASH 4X4 ULTIMATE
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.
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 Slash 4X4 Ultimate’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.
Slash 4X4 Ultimate 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 (30K)
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 silicone differential fluid in a variety of
viscosities:
Part #5135: 10K
Part #5136: 30K
Part #5137: 50K
Part #5130: 100K Part #5039: 500K
Follow the steps below to access and refill the front and rear differentials:
Front differential:
1. Remove the two 3x15mm button-head screws that secure the
top bumper mount to the differential
(
diff) case.
2. Turn the chassis over and remove the three 4x10mm countersunk
screws that hold bumper/skid plate to the bulkhead. The two rear
screws do not need to be removed.
3. Slide bumper assembly off of the chassis.
4. Remove 3x15mm button-head screw from diff tie bar.
5. Slide tie bar off truck.
6. Remove two 3x15mm button-head screws from diff cover.
Do not remove the two screws that secure the shock tower.
ADVANCED TUNING ADJUSTMENTS
