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I installed the 2.5" vacuum controlled exhaust dump valve on the air box yesterday and got just what I expected... bottom end torque dropped off. The valve starts to open at something like 15 inHg, I need to find a way to change this so it opens at ~10 inHg.
I am open to suggestions...
While I did not do any datalogging, one thing stood out on the drive into work today was the vacuum signal off the MAP seemed to be higher on the flats near the port... (nothing is flat around here except that area). I expect a drop in mpg's doing 60 on the work commute. What I am shooting for is a shift in torque up the rpms under heavier loads at higher speeds.
Will see how the mpg's pan out as is 1st though (prior to trying to adjust the control of the valve)
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