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Originally Posted by Fourdoor
If you are not getting knock then it isn't advanced too far. If you manage to run 40 deg without knock then you are fine.... it is all about knock, not about how much advance you are running.
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Hi there
Long time no speak ...
Regarding the ignition advance settings, while you're right in practice on lowly tuned cars, IMHO the "correct" ignition advance setting depends on a bit more than whether the car detonates or not.
You mentioned combustion chamber pressures. As you know, the more you advance the ignition, the leaner the fuel mixtures and the higher the boost, the higher the combustion chamber pressures.
All that to say that, even if you may well run 30 deg of timing in the high rev range at relatively low boost levels like the aforementioned 1.2 bars relative, you will certainly make a few more hp, but also run much higher combustion chamber pressures and have less reliable an engine.
What's the 93 / 91 in the O2 column? Lambda values ie. 0.91 / 0.93 lambda ie. 13.4:1 or so AFR?!
