How to Make Golf Carts Go Fast
Adjust the governor. To do this, remove the plastic covering behind the seat, find the T-shaped governor, and tie off the silver, thick section of metal to the metal bar behind it. Replace the covering when done.
Replace the tires with larger ones with thicker treads. This will allow you better traction at higher speeds, as well as greater revolutions along the ground.
Replace the factory gear set with one with a lower ratio.
Install a higher amperage, high performance controller.
Install a motor with a higher RPM. Check first to make sure that it will fit adequately into the body of your golf cart.
Lose excess weight from the golf cart. Find any unnecessary pieces you can safely remove and do so. Just make sure you know what you're removing, and that it isn't neccessary to your golf cart's performance.