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Re: Running at Maximum Advance (archive)

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Posted by Shawn Fogg on November 13, 2000 at 07:38:41:

In Reply to: Running at Maximum Advance posted by Yukon Dave on November 12, 2000 at 21:18:17:

"We do not know exactly what the computer is going to achieve with the octane of gas it has. Is it 92 or 93 octane that the computer hits maximum."

What fuel will get you max advance will vary depending upon the atmospheric conditions and from car to car. Max advance on a stock MZ3 looks like it is around 24 degrees BTDC near redline @WOT. I've seen the same engine Sharked (further advanced) not knock on 93 (I think) octane fuel. So on that engine on that day the 93 octane was more then needed for the stock maps.

The flipside of course is I've seen my own engine retard timing (knock) on 94 octane at the top of third gear when my mixture wasn't quite right with the supercharger.


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