Originally Posted by Mudbug
Ok where did you get that idea from? 2lbs of boost doesn't neccesarily mean anything. If you take a T3 turbocharger and run 12psi on it and then you take a T4 turbocharger which is much larger and run 12psi on it your engine with the t4 is going to have a sizeable amount more hp. Boost is just the pressure. Its cfm's you need to calculate.
Apparently I made the laws of physics. Atmospheric pressure at sea level is 14.7 PSI. This is what the HP in engines are rated at. In any combustion engine....apply 14.7 LBS of boost (true boost into the cylinders) then you double the HP assuming you match the fuel delivery. But alas....here is the one problem...creating boost creates heat...heat causes your octane ratings to rise and robs HP as the hotter air is less dense. So you loose a percentage of your HP to heat. That is why a T4 is more efficient. Also the in/out is larger causing less restriction as some boost is lost creating pressure in the system...that is why I said cylinder pressure for boost (must be read from inside the intake). If you put 2 lbs of boost from any application supercharger/turbo on a 238HP motor you will gain about 30HP...Period...end of story. (Assuming your application can deliver the fuel)
* Note ---please read boost as applied manifold intake pressure/ not system pressure (sensors behind turbos or in the intake pipes)
And how can you create 2lbs of boost inside a motor (a 13.7% increase in air) without increased CFM?