a awd has a loss of 20% loss because its being transfered to two differentials and a rwd has about 10% loss. a awd has no such effect on a launch at a drag talking about high power cars this is because when the car starts to move suddenly the front end lifts increasing traction at rear wheels its only when the front end lands down its gives front wheel power thats why you dont see any awd dragsters any most of thw world record holders have rwd cars.
see this video its a 6 sec car it is street legal as no emission tests on older cars its s 84 vette with 106 mm Precision turbo iput this video to show about traction loss: