Moroso's Power-Speed Calculator is like having a dyno in your back pocket! Using information such as tire size, gear ratios, horsepower and displacement, this handy slide rule tool works out the relationship between E.T. and MPH, tire diameter to speed and gear ratio, engine displacement to compression, power to weight ratios, and many other factors that go into building a race-winning car.
Tire diameter to speed and gear ratio
Engine displacement to compression ratio
Horsepower measured at flywheel
Horsepower ratings are calculated for Rear Wheel Horsepower