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About Our Office

Effective horsepower (ehp) / True horsepower (thp) Effective horsepower is the power converted to useful work. In the case of a vehicle this is the power actually turned into forward motion on a chassis dynamometer. In its cleanest form, it's also called "True HP" - the amount of power transferred to the drive roller plus the dyne parasitics, corrected the chosen atmospheric "correction factor".

In automobiles and motorcycles, "effective horsepower" is sometimes specified as wheel horsepower. All automotive type chassis dynamometers measure "True HP". Some companies then apply various, manufacturer specific produced inflation factors to boost up the displayed horsepower numbers for marketing purposes. It's common for many "mass market" dyno operators to not even be aware that the inflation is added.

Whereupon the problems arise.

As stated above, different companies choose to apply different amounts of power figure inflation to the power actually measured at a chassis dyne's drive roller - ranging from 0% (known as True Horsepower) to as much as 30% or more on common mass market dynamometer systems.

This random amount of power figure manipulation between manufacturers makes it impossible to compare power figures produced on different dyne systems - unless they specify "True HP" which indicates that they have added nothing other than the dyne's own parasitic drag (mostly wind and some bearing friction) and corrected to the test's atmospheric conditions.

"True hp" will be 10% to 20% or more lower than the engine's power "bhp" ratings because of a loss through the drivetrain, especially notably, the tires.

On a chassis dynamometer, "True hp" scale wheel horsepower will be a lower number than other chassis dynamometer variably adjusted upward power figures.

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