take the 1320 ft in the 1/4 and divide it by the speed you ran will give you a good rule of thumb of what your car's potential E.T. should be. It works if the car is set up right. Go ahead, get a calculator and start the divisions, of what you and your friends run for et and mph and see how accurate it is. The tough part is, this assumes you've set your car up to 60 ft, not the easiest for street cars.