http://www.tciauto.com/tech_info/calculators.htm

this is the one i always use.

 

Im trying it for stock cars, based on fast-autos.net information, using a 160lb driver.
Toyota Supra Turbo (320bhp): 394bhp
Dodge SRT-4 (230bhp): 310bhp
Dodge Viper SRT-10 (500bhp): 587.5bhp
Chevrolet Corvette Z06 (505bhp): 596.4bhp
'67 Chevrolet Camaro Z-28 (290bhp): 286.3bhp
'93 Chhevrolet Corvette ZR-1 (405bhp): 415.6bhp
Nissan 300ZX Turbo (300bhp): 343.4bhp
'69 Ford Mustang Boss 302 (290bhp): 291.9bhp
'70 AMC AMX (325bhp): 252.6

 

I didn't even think to try my Z06's numbers, it was only off by 12 hp. Pretty good.

 

DAMMIT!!!!It sayd i only had 23Hp I, guess it didnt take my intake i have commin out the hood that gave me 50 extra hp... haha

 

Ya i just did it, ya its pretty damn close

 

That puts me at about 290 whp on my best run (!). I can hardly believe that considering the mods to my car and the problems I had on that run, but that's going with a very conservative estimate of what my car weighs. Hmm, crap, now I have to put my car on a dyno to find out. Time to drive to Orlando...