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Return to Parts List Category : N- Tools & Books MOR 89650 POWER SPEED CALCULATOR HELPS TO CALCULATE E.T. AND MPH $19.99  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 tool works out the relationship between:   E.T.,M.P.H. and power to weight ratios Tire diameter to speed and gear ratio Engine displacement to compression ratio Horsepower measured at flywheel Horsepower ratings are calculated for Rear Wheel Horsepower