Originally posted by taylormadem5
Very interesting, but i have never heard of a turbo having 100% effeciency. I know you used it to keep the math simple, but it also screws up the #'s a bit. and some turbos have internal ir external wastegates that limit the boost it can make. You can get around that by either removing it or using an external blow off valve sometimes. I know my friend did on his 99 F350 with a power stroke, he cute the line for the wastegate and got 5lbs more boost out of it and is running upwards of 27psi on his truck. I think the Eclipses make like 8-10lbs of boost and are only getting like 50-60hp more than the NA eclipses, but they are totally different engines as well. Its really hard to figure out just how much HP your gonna get either way with out puting the turbo on and doing a dyno pull.
Wastegates can be controlled and held shut by boost controllers in order to raise boost levels. Blow off valves have nothing to do with control the level of boost a turbo puts out, and a blow off valve is inductively "external" by definition, unless it's a bypass valve, which gets routed back to the intake piping before the turbo inlet.