How can you estimate horsepower?

[Wren57]

hmm, I'd say somewhere around 300 at the crank. 8psi isn't going to get you 100% Hp gain, more like 50% or less with the loss you incur due to the extra belt... a decent rule of thumb (yes I know this doesn't always apply) if that for every bar of pressure (14.7psi), you gain 100% of hp. That would make 8psi somewhere around 55-60%hp gain, then subtract the belt tension loss of the SC. Manifold helps too, especially since you have boost. What do you run at the track? That could help in figuring it out. Also, are you running cats or a downpipe? What kind of exhaust? Mandrel bent or crush bent? Is your A/F Ratio rich or lean? Do you have lots of black residue on your exhaust? Lots of questions, yes, but all can help me guess a bit closer to your HP...