In Reply to: Octane Question posted by Jean Arruda on August 13, 2000 at 20:10:58:
(posted from: mat-1-37.enter.net (207.16.155.47))
Basically, running higher octane gas will allow more advanced timing before detonation occurs.When detonation (spark knock)is sensed the engine management systems will begin dialing back timing - resulting in less power, but protecting the engine. In my opinion you should not be running 91 octane in any z3 on a regular basis, but particularly in a chipped M! The engines are all highly tuned to take advantage of high octane fuel, but a chip will optimimize these settings further, eliminating compromises that the factory dials in to allow for occasional lower octane fuel. I normally use 94 in my 1.9, but will use 92 in a pinch.I think 91 octane with an agressive chip is a recipe for trouble not just lower mileage and performance.
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