Quote:
Originally Posted by GT3 Tim
The ecu will adjust timing, but it does also adjust your A/F mixture...that is what the O2 sensors are for. However, as long as you don't contaminate the O2 sensors (with leaded fuel, etc.), they should function properly and keep you at ideal A/F ratios all the time...octane levels would not effect this.
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I know the ECU adjusts the A/F mixture, and many other variables as well, but that's not the question. The question is why would the ECU change the A/F mixture in the presence of higher octane fuel? What is the relationship between A/F mixture and octane?