Is there anyway to find out your WHP w/o a dyno? Like my D16Z6 is throwing out 125 - but there's no way there's 125 at the wheels - that's a flywheel number... So is there any equation or calculator out there that can calculate WHP based on HP and torque, or weight, or anything like that? Or is it all left up to a dyno?

 

there is a 1/4 mph / weight equation that will get you close.
but my bone stock z6 with no mods and 150k on the clock, put a staggering 92 whp down on a dynojet.

 

there are calculators on the net, just do a google search. they usually ask for your weight and 1/4 mile time.

 

http://www.speedworldmotorplex.com/calc.htm

 

on a FWD civic (MT) power loss is usually about 22-27% from flywheel to wheels