Horsepower Equations Calculator

Automobile Car Truck Design Formulas


Solving for the change in engine or motor horsepower performance using the trap speed method.
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:

vehicle weight
speed or velocity before modification
speed or velocity after modification


Conversions:

weight = 0    = 0  pound
velocity1 = 0    = 0  mile/hour
velocity2 = 0    = 0  mile/hour

Solution:

change in horsepower (hp)
= NOT CALCULATED

Other Units:


Change Equation
Select to solve for a different unknown
rotating horsepower
Rotating horsepowerRotating horsepower
TorqueTorque
SpeedSpeed - revolutions per minute (rpm)
estimate engine or motor horse power for cars, trucks and motorcycles
trap speed methodEstimate of engine horsepower after a quarter mile run using the trap speed method.
increase in engine horsepowerDetermine the increase in engine horsepower when an after market modification, race or performance part has been installed with trap speed.
ET methodCalculate engine horsepower after a quarter mile run using the ET method.
estimated increase in engine horsepowerCompute estimated increase in engine horsepower when an after market, racing upgrade or performance part has been installed with ET.
Dyno correction factorDyno correction factor. Factor corrects horsepower for normally aspirated internal combustion engine to a standard humidity, pressure and temperature after dynamometer measurement.
vehicles power to weight ratioCalculate a vehicles power to weight ratio. Acceleration is related to the ratio.

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