Slash is designed with plenty of power for all-terrain fun, but we're going to
demonstrate how a few simple upgrades can provide a major power boost and
dramatically increase top speed. We will install a new power system, change the
gearing, and add a high-powered 3S LiPo battery to complete the upgrade.
For tools, we will just need 1.5mm, 2mm, and 2.5mm hex tools
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 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 Slash VXL manual for additional gearing
combinations. There are many battery options--we will go with a 3-cell 5000mAh
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 2-cell 7600 LiPo for general driving and long runtimes.
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 receiver box and
wire clamp.
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, 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 wire clamp and 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 installing the 25-tooth pinion and 86-tooth spur gear.
The 'A-B' gearing adaptor can be used with the lower motor screw and 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. The adapter is not recommended if using the 28-86 gear in combination with Slash VXL.
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 gears 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 Slash is ready for even more speed and power. For more tips,
tricks, and upgrades, visit us at Traxxas.com