I know how to launch the car, and to turn TCS and A/C off. But what exactly does turning the TCS and the A/C off do? Does it free up Horsepower or torque?

 

Turning TCS off keeps the engine from pulling timing when you dont get traction. Turning the AC off is just a standard practice that people got used to because it helped by giving more HP back in the day but some people tested it in our cars and there was no difference in HP with it on or off. Most people still do it though because it keeps some fluids from being dripped onto the track.

 

when you A/C is on, your car engine is sending some power to make A/C work.. as you know , to turn TCS on is not good for racing, because, when you floor it and when your car starts to spin, your computer automaticly close and open your throttle body and this will make you loose some power.. Turn it off and let that engine sends whatever she gots to the wheels