| "The inlet piping on the other hand is not under pressure. Therefore, there is no such thing as pressure drop..." This is false. While it would be under no gauge pressure, it is still under pressure (atmospheric). Thus, there is pressure drop associated with the suction side of the compressor (creating the air flow). Just as post-compressor piping, the longer/smaller the pipe, the larger the pressure drop. With lower pressure, there is lower density, and with that comes less 'air' per volume (lower compressor efficiency) You're sort of taking my quote out of context. I mentioned that the atmospheric pressure would change based on elevation. I just didn't want to get into the technicalities beyond "boost pressure" vs. "atmospheric pressure." Sure, it would technically be under "no pressure" if we were driving around in a vacuum. But that's not really constructive to the OP. For the purposes of comparing inlet piping to intercooler/pressure piping, the inlet piping has negligible pressure drop. "...based on thermodynamics that the more times the air has to change directions or diameters, the worse it is for flow." That's a statement of fluid dynamics, not thermodynamics :) You got me here...But do you know the best way to get a correct answer on the internet?
...Post the wrong one ;-)
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