Quote:
Originally Posted by Bob Denman
Question... Since the fuel injection system is leaning out the mix as the barometric pressure drops: won't that sort of balance out the lower cylinder pressures advantage?
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Good question!
Yeah, even the somewhat primitive ECM in these V10's compensates mixture and ignition timing for baro. It only has a certain range though so it's not always perfectly optimized. Yes, leaner mixtures will be more prone to knock, but baro/cylinder pressure has more of an influence on knock at altitude than the mixture does.
In other words, you can be super lean at high altitude and not ping. You can be just a little lean at low altitudes and ping. Cylinder pressure is the bigger factor. Make sense?
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