Drag Race Exploit
Also, when you have enough money ($10,000 is a good amount to start with) you can host your own events. Make it a sprint and allow only class 1 cars. You will get 2 racers (T.K. ans Biggi) and they will have either a corvette or a viper (99% of the time) always choose the viper as it is much faster than the corvette. If both drivers have the same car look for which car has the higher BHP. If they are identical, choose Biggi as he is the better driver and will win most of the time.