If your turbo was set to 0 delay and you nailed it from the start, you would begin your turbo timing before the boost timing was allowed to come in. The turbo is not meant to give you more punch in the corners, it is meant to give more top speed after the normal boost has had a chance to work. It should only be used on longer straights. If you do have a 0 delay and add too much timing down low, you will bog down the motor. It will lack punch and create alot of heat. Tune the car without the turbo and then add it in afterward to get the straightline speed that you want.