Dyno...what do you think?
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TECH Enthusiast
Joined: Mar 2010
Posts: 700
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From: Utah
I dont think so less air is less air. Less air entering the motor on the same tune would result in the tune becoming richer. The turbo has to work harder so its efficiency goes down. I am guessing the reason the psi goes down is because the loss of air makes the backpressure go up on the turbo because it is having to suck harder to actually makes less boost so back pressure city on a small turbo. I think this theory sounds right, at least in theory lol.
I think your theory is correct. Loss of air...cylinder pressure caused by the valve springs. Think that's why my a/f goes rich as crap up top.
