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Message: [QUOTE="CATDiezel, post: 1123176, member: 4387"] Jcain.... here my point. I agree with what your saying however what I'm not agreeing with (don't take this as a hate argument please) is that the AE has hardly changed and the mass index or volumetric weight by cfm. Is relatively the exact same. Flowing more vs heat vs AE vs restriction measured in PSI-- the engine is still consuming the exact same amount of air from one turbo to another at 30psi. Very very small change in his turbine wheel ratio. Now with all that jibberish being said... I do follow what your saying and it's possible I may need to go to storage and pull my turbine compression books back out. I may be making this more complicated than needed but I'm pretty sure that a turbine jet engine study will do that to my brain. I am using that knowledge with a Ci engine. But it's the exact same. And the exact same we calculate rated flow on a natural gas pipeline. Pressure ratios volume drops temperatures. Ect ect. So to put this simple or even asking a simple question. Your telling me that the change in efficiency from the first turbo Dan was running to the second is packing more pounds per square foot of density and has nothing to do with the fact he freed up back pressure post cylinder? My humble opinion is to gate the smaller turbo while keeping it within the acceptable map. The (AE) is relatively the same on most modern turbochargers. This is why the newest 15 model turbo from ford is able to go up to and beyond 600hp.. (GATED). Please keep in mind I'm not trying to be a hater... I truly love it when I see guys doing some form of real life testing with factual numbers not just "it feels good" or watch this video of my mph gage. [/QUOTE]

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