Originally Posted by articfriends

Lets assume you are making 550hp from the motor itself, going to 14.7 psi of boost would theoretically double the hp minus any friction or resistance it takes to turn supercharger, my guess is it takes about 10 hp or so for every pound of boost to turn your procharger (I was going to actually dyno mine with supercharger pumping air thru enough restriction but disconnected from motor when I did both a N/A tune and blown tune to see what it really took but never did while on the dyno) . Anyways if going to 14.7 psi of booost effectively doubles your hp minus friction then that would be a 550hp gain, so divide that by 14.7= 38 hp per psi of boost. 6 psi of boost would give you a gain of about 228hp, if it took lets say 50 hp to turn the supercharger you would have a net gain of about 175, add that to 550 and puts you at about 725 or so, using the wag method here though becausse we are making a assumption of what your motor makes on its own. If my numbers are correct then 10 psi would give you about 380hp, minus the 100 it took to turn the S/C which is a net gain of about 280,plus 550 would put you around 830 hp. I made 945hp a while back on mine at about 11-12 psi with a 540. I made 1115hp at 14psi or so of boost last time on the dyno, motor made 650 or so on its own, at that rate my numbers are close, 44.2hp per lb of boost x 14= 620 hp gain, 620+ base 650=1270hp, if supercharger took 140 hp to do it would put me at 1130 and I was at 1115 so numbers are somewhat close, Smitty

Originally Posted by GPM

How much fuel were you burning at 1115 hp ?

Originally Posted by articfriends

No return fuel meter on Crocketts dyno to measure fuel and calculate bsfc when running efi back then but if I was doing it today I would just return extra back to pump suction while dynoing and put meter on pump suction but I did not think of it then, Smitty