Horsepower Equations Calculator
Automobile Car Truck Design Formulas
Solving for the change in engine or motor horsepower performance using the trap speed method.
This method uses the speed or velocity at the end of a quarter mile run. It is used to give an estimate of vehicle(car, truck, motorcycle) engine horsepower. Weight should include the mass of the vehicle, driver and passenger. Power will need to be measured before and after performance or after market parts have been installed.
Inputs:
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Conversions:
vehicle weight
= 0
= 0
pound
speed or velocity before modification
= 0
= 0
mile/hour
speed or velocity after modification
= 0
= 0
mile/hour
Solution:
change in horsepower (hp)
= NOT CALCULATED
Other Units:
Change Equation
Select to solve for a different unknown
Select to solve for a different unknown
Engine horsepower estimate using quarter mile elapsed time Includes plot and graph |
rotating horsepower
 | Rotating horsepower |
 | Torque |
 | Speed - revolutions per minute (rpm) |
estimate engine or motor horse power for cars, trucks and motorcycles
 | Estimate of engine horsepower after a quarter mile run using the trap speed method. |
 | Determine the increase in engine horsepower when an after market modification, race or performance part has been installed with trap speed. |
 | Calculate engine horsepower after a quarter mile run using the ET method. |
 | Compute estimated increase in engine horsepower when an after market, racing upgrade or performance part has been installed with ET. |
 | Dyno correction factor. Factor corrects horsepower for normally aspirated internal combustion engine to a standard humidity, pressure and temperature after dynamometer measurement. |
 | Calculate a vehicles power to weight ratio. Acceleration is related to the ratio. |
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