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Re: 3rd gear knock... I need expert advice PLEASE
There is more load on the engine in higher gears from rolling resistance and wind resistance. You also spend longer amounts of in each higher gear, so there is more time for heat buildup. You need to tune in 3rd and 4th gear and accept that it might be extra conservative in 1st and 2nd gear.
Have you tried less boost? Are you using methanol or just denatured alcohol? Have you tried going negative on the timing sliders? How are you reading A/F? The A/F ratio in DSMLink is a just a mathmatical guess and stock O2 volts often do not stay linear. Any chance the headwork did more harm than good?
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