Quote:
Originally posted by nize
ah okay i missed it. 
it's possible that the p.o. had it tuned for higher boost and more fuel to match the chips. what boost does the gauge show?
maybe it's time to dyno the car and see the actual a/f graph. if you turn this down too much without knowing the a/f, you could do serious damage.
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A dyno is an excellent idea, except I've never been to one and have not a clue what all goes into it. There's a TorqueFreaks in Portland that I've been looking at on the net.
The car is running at about 16psi of boost from what I can see out of the corner of my eye while I'm driving, maybe 16.5. The PO had it at 17.5 when we did the exchange, but I decided to turn it down a hair. The FQS switch was set at the 4th position option that gave it a 2 degree ignition retard. But I went in and changed it back to the "0" position which is GURU optimized 91-oct. (R+M/2) pump gas up to 18psi boost with stock injectors. Here's a link to what I'm talking about.
FQS Adjust Not that I really know what the difference would be between an advance or retarding the timing, but I'm not doing above 18psi. I wish I knew how to use this GURU system; have tried reading through all the "steps", but still not understanding.