A good reason to not race in the rain is it's hard as hell to control, at least with a touring car with slicks! At the last race I was in, in the second qualifier it started to rain, pretty lightly, about a minute into it. No one wanted to stop, so we kept going, it was a good lesson in being smooth, let me tell you. punching the throttle (with my TC3, stock motor, 31t pinion) would almost spin the car, it was tough.