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and at 15psi this goes to ~414CFM... neglecting the effect of turbo efficiencies and temperature increases, by increasing the boost you will increase the mass air flow. Yes, yes...? No mention though as to what the pressure difference is coming out of the turbo vs. what it is in the inlet manifold - because relatively few take the time to think about that. The intercooler is one part of the total restriction; you might be able to estimate the pressure drop from all of the ducts, bends and their equivalent lengths, but with the intercooler being much more complex than a simple duct, it will require testing it to get it's dP at a given CFM or CFM at a given dP as Ash has done in the chart. I don't see what the benefit of testing an intercooler at operating pressures would be when you can easily run the numbers based upon a data point achieved at a much lower (more economical) pressure and get your answer. Testing at operating pressure is not going to reveal anything that will revolutionize the way air flowing through a duct is understood.
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