If I get my car measured on a dyno, since it will be wheel HP, is there some sort of conversion that I can figure out what the engine HP will be?

usually about 20 percent loss to the wheels on awd

The losses between BHP & WHP are specific to each car. Driveline friction, pullys, valvetrain, tranny, etc., etc., etc... No one formula will work for ALL cars. Even 20% kinda falls into the S.W.A.G. category, but it's a generality, and works as one as log as you don't go around accepting it as gospel that ALL cars lose 20% between BHP & WHP, not even ALL 4WD/AWD cars, for that matter.,,

Some shops use 22% other use 23% for the quattro awd. Some shops (usually evo and wrx tuners) say drivetrain loss isnt a percent its a set number (stock hp from factory - dyno'd stock hp = drivetrain loss), FWD cars are much lower but I cant remember exactly what percent

just time the hp given by 1.15 to get the crank hp

If its 23%, shouldnt I multiply the wheel hp by 1.23 to get power at the crank?

yes. Unless you have FronTrak instead of Quattro, which makes the drivetrain loss closer to 12-15 percent.

all i know is when u look at dyno sheets they tell u to multiply the hp by 1.15 for it at the crank.

I have the quattro.

so how much at the wheels..does a 05 1.8T FWD have?