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Calculate 1/4 Mile ET Change From HP Change
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These equations are for recreation only.
This calculator uses the Motorsports Standard Atmosphere (MSA). (Not ISA - International Standard Atmosphere)
Grains - Grains of water vapor per pound of dry air
The HP Correction is a better determination of ET than the DA (Density Altitude).
I have included them for your benefit.
New ET From HP Change Calculator