I use to play with R/C cars when I was younger. I often thought on how to make a little cheap car go faster with out dishing out a ton of money. Well it just hit me when I was working on the spindle control for the CNC.
A typical cheap RC car is nothing more then a RC receiver and one or two H bridges. If you toss on a higher voltage battery you’ll burn something up. Reason being the car would be designed to use enough power to run the radio and H bridge.
Now if we add a second H bridge we can add as much power as the drive train of the car can handle. Or even re-purpose the controller for something else.
Just add the H bridge to the output of the controller and use a higher voltage for the input and Bob’s your uncle.