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Originally Posted by Sato
EGT's can go up from too much advance as well as to little advance!! I have heard of guy's advancing the timing too much and blowing up their engines,,,and it ain't cause the egt's went down. YOU CAN DETONATE WITH TOO RICH A MIXTURE ALSO!!!l ALWAYS DECREASE EGT'S WITH MORE ADVANCE IS VERY INCORRECT! SATO
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Of course, too much ignition advance and/or bum A/F ratios can raise EGTs to dangerous levels (and increase risk of engine damage from knock). My comment that EGT will always be reduced with more ignition advance with injection of alcohol or water, is ONLY up to the point of not exceeding the new injection produced knock threshold while maintaining the proper A/F. That's a tuning common sense given, but guess I didn't stress that completely enough. TuboIce has explained it much better in his response above.