Traxxas 71074-1 - Manual (Page 25)

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High Speed Gearing
The included high-speed pinion gear can be installed to increase
the top speed of your model to 50+mph. This also requires the
use of an additional battery (sold separately) and a Traxxas series
connector (Part #3063, sold separately). See page 12 for more
information.
50+mph Battery and Gearing Installation Instructions
1. Install the included high-speed pinion gear as described in
Pinion Gear Installation Instructions on page 24. Install the
supplied battery as described on page 11.
2. Install an identical Power Cell Series 1 battery (#2925) sold
separately) in the opposite battery compartment.
3. Plug both batteries into the Y-harness (sold separately). The
harness connects the two packs in series. The two 7.2-volt 6-cell
battery packs will operate as one 14.4-volt 12-cell battery pack.
4. Plug the Y-harness into the speed control.
WHEELS AND TIRES
Your model uses 12mm axle hexes, which allow many types of
aftermarket tires and wheels to be adapted for use on your model.
Most will affect the overall width and the suspension geometry of
the model. The offsets and dimensions designed into the model’s
wheels are intentional; therefore, Traxxas cannot recommend
the use of other non-Traxxas wheels with different specifications.
Experimentation with different types of tires is recommended
to see which ones work the best on the terrain where the model
is run. Soft compound tires with many short spikes generally
work better on hard, dry surfaces. In loose dirt, a tire with large
spikes should perform better. Foam tires can be fitted for use on
pavement or indoor carpet tracks. See your parts list for accessory
wheels and tires.
When selecting tires, consider the overall diameter of the tire.
If the overall diameter is significantly larger than the stock tire’s
diameter, you will need to use a smaller pinion gear to compensate
for the larger tire. If you wish to install tires with a diameter
greater than 4 inches or 100mm, Traxxas suggests you configure
the transmission for “underdrive” gearing. Details on making this
simple modification are available at Traxxas.com.
TUNING ADJUSTMENTS
Precautions
• The High Speed dual-battery and gearing configuration
is for high-speed running only. Avoid repetitive hard
acceleration to prevent overstressing the motor, speed
control, and batteries.
• Make certain both batteries are fully charged before
installing them in your model. Installing a fully charged pack
and a partially discharged pack may lead to over-discharging
and damage to the partially discharged battery.
• Do not mix batteries of different brands, chemistries, or
capacities. Only genuine Traxxas batteries are approved for
dual-battery use in this model.
• Stop running your model and allow it to cool if the speed
control’s thermal overload protection activates or if the
motor temperature exceeds 200° F.