Razor mx500 (mildly modded monster)
It's not really a speed booster by itself although it might give you 1 or 2mph, it allows more amps to reach the motor from the power source. So the better the power source the better the gains will be. Think of it as doing a lightweight flywheel on a car... by doing so you free up 5-10% of the power originally lost through centrifugal mass. That by itself isn't really noticed on a stock 200hp motor however if you do other mods to increase the motors power output to 400hp and that 5-10% becomes more noticeable. It's the same idea really... the speed controller mod frees up a pathway for more power to be made but it's still limited by the power source itself. Increase the power source, get better gains from the mod.Without me going back into threads.......
What is the controller mod worth in top speed by itself???