[whatthe]

Stock fuel cut on my GT is 7500rpms. Max FE for me is going to be below 4000rpms and if I'm hypermiling I should theoretically never see above 4000 again. Therefore, my factory intake is poorly tuned for the 750-4000rpm range and it is an area worth investigation. Although, I will say that I do agree that CAI is not necessarilly the way.

Why do you say that acoustic tuning will not be effected at part load? As I see it, the air is still pulsing even past the throttle valve. If you go home and stick an 8 foot section of pipe on your intake, go for a drive, and tell me that it didn't make a difference at part throttle.... I will be incredibly surprised. I have an exhaust/intake theory book that has a few graphs showing the effects of cylinder pressure/filling against valve opening for a few different lengths of intake. This length of pipe was placed before the "carburetor/intake manifold" (older book).

From an incredibly limited experience stand-point, and a premature update for Vanner, I put a 6-7 foot length on my GT yesterday, put the wideband on, and went for a drive today. The pipe is longer than the theoretical values I was thinking of, but I used some old intercooler pipes and common sense says it's easier to make it shorter than longer later. There have been some interesting changes that I can better get into after a tank of gas.