Quote:
Originally Posted by Endless619
But lets say a stock E86 M dynos at around 270 hp to the wheels. Slap on a 100 hp SC kit and he should be at 370 hp. I dont see whats wrong with that. Are some of you folks claiming the kits give an added 200-300 hp? 
If my mind serves correctly the VF SC for the S2000 and the SC kits for the NSX only gave you about 80-100 extra hp with the bolt on kits, with tune. |
Multiply your base horsepower by the ratio of the pressure increase. Atmospheric pressure on a standard day is 14.7 psi.
270whp x [(14.7 + boost_psi) / 14.7]
A ballpark estimate is 435 whp, not including variables such as drag, heat, tuning, efficiency ranges, or modifications in the exhaust. It is a quick down-and-dirty estimate. Considering the OP's mods, he's putting down similar power to a kit running 6 psi, not 9 psi.
If your pressure at the throttle bodies is 9 psi, I would start looking at the other factor - the engine and exhaust. It could be something mechanical (maybe a clogged cat) or the supercharger's tune. If AFR's look correct and the everything else that's external checks out, I would consider a compression/leakdown.