Calculate Your HP From Head Air Flow
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These equations are for recreation only.
Not a substitude for actual testing.
The HP is based on flywheel HP, for rear wheel HP multiply the results
by your drive train percentage loss and subtract it from the result.
This calculator is based on Naturally Aspirated applications.
For a more accurate calculation try Larry Meaux's Pipe Max.
His program is excellent and will provide a lot of info.