Stampede is a high-speed monster truck with plenty of power for all-terrain
driving. But we're going to demonstrate how a few simple upgrades can provide a
major power boost and dramatically increased top speed. We will install a
new power system, change the gearing, and add a high speed 3S LiPo battery to
complete the upgrade. For tools we will just need 1.5mm, 2mm, and 2.5mm hex tools,
a Phillips-head screwdriver, and a 7mm nut driver.
See a list of all parts and tools used in the description. For the power
system, we will use the Velineon VXL-3s brushless system. This ultra-efficient,
low-maintenance system is optimized for maximum power flow. For the gearing, we
will install a 25-tooth pinion gear and an 86-tooth spur gear. This gearing will increase the
top speed of the model, but should only be used for high-speed running on even
terrain. For general driving you can keep the stock gearing. See the Stampede VXL
manual for all gearing combinations. There are many battery options--we will
go with a 3-cell 4000 mAn LiPo battery which can be charged with a LiPo
charger like the EZ Peak Live. A 3-cell LiPo can provide the most power and
speed but we also like to use a two cell 5800 LiPo for general driving and long
run times. Even when used with a 7-cell NiMH battery, the
brushless motor will provide more speed and power when used with appropriate
gearing. Be sure to follow all instructions and
warnings included with batteries and chargers. First we will install the new
power system. With the model powered off and battery removed, unplug the motor
from the ESC. Now open the wire clamp and receiver box cover.
Unplug the ESC from the channel 2 slot in the receiver. Remove the original ESC from the chassis.
Install the new VXL-3s speed control with the included mounting hardware,
then route the connector into the receiver box and plug it into the channel 2 slot
on the receiver. Note that there are two channel 1 slots, so make sure that the
plug goes into the channel 2 slot. Now close the receiver box. See the related
video on how to ensure a watertight seal on the receiver box. To remove the
original motor, take off the back right wheel and remove the gear cover.
Go ahead and remove the original spur gear if installing the new gearing.
Remove the original motor.
If your model has a fixed gear adapter, you may need to use a different adapter
for the new gearing. The correct adapter for the 25-86 gearing combination is
labeled 'A-B' like this one, and the lower motor screw will go in the 'A' position.
This adapter is included with part #3790 and includes a guide
for use with other popular gearing combinations. The adapter is recommended
for higher-speed VXL models and it will make setting the gear mesh a little easier.
If installing the motor without a fixed gear adapter, make sure the motor
screws are tight, and see the related video for more information on setting a
proper gear mesh. Put the adapter in place and install the new Velineon
motor. Use the included hex screws to secure the motor. Now install the new
86-tooth spur gear and tighten it down.
Put the new 25-tooth pinion gear on the motor shaft, with the small screw securing it against
the flat side of the shaft. With the motor and gear secured, replace the gear
cover and wheel. Connect the motor to the ESC using the color-coded wires and
plug in the charged LiPo battery.
When installing new electronics like a speed control or radio system, it's a
good idea to calibrate the new ESC. See the related video for instructions.
Also, ensure that low voltage detection is enabled when running a LiPo battery.
The light will glow green when low voltage detection is enabled. Now the Stampede is
ready for even more speed and power. For more tips, tricks, and upgrades visit us
at Traxxas.com