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All the formulas that figure out what your trap speed and ET and horsepower need to be, are they using flywheel horsepower or rear wheel horsepower?
 

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usually rwhp since they dont know the actual setup of the car with respect to friction losses in the powertrain. they tell you the hp after all the parasitic losses.
 

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RWHP And the ET calcs are pretty worthless. MPH and weight are the only thigns that come close.
 

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actually, 1/4 mile mph and car weight will give a good est of rwhp. then there are minimumet et charts for a given mph which are estimates. these are tools which can help you get a handle on your combo & help you optimize your combination. their figures are not carved in granite, but are ballpark approximations which can be useful.
 
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