I find it weird that people are saying the car is slow. If your drive train spins free and is not binding and is geared properly there is no reason the car itself can be slow. Make sure everything is free and you are geared properly and you should not have any problems. As stated earlier the internal drive is 2.6, I am geared between 7.5 to 7.8 with a monster stock on a medium to large carpet track running rubber tires .