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Very high octane and base boost
Posted by Chris Moberg [Email] (more from Chris Moberg) on Thu, 13 Apr 2006 19:43:19
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Jak and others
From what I have read about octane and its effect on pre-det, is that the greater the octane the a) greater the boost and b) greater the advance and engine can support without pre-det.
So my idea in getting very high octane fuel was to somewhat negate the active modulation of the APC as it detects knock. My logic, there will be no knock at 18-20 psi and 10.5 degrees of advance with 109 octane.
No knock means the waste gate will not be opened by the APC controller to control pre-det. So while I can appreciate the concept of spring stacking (which I likely have to some degree) I think it moot because the waste gate will not be asked to bleed much pressure (to control pre-det). Base boost is not so high as to generate run away boost.
My long term plan will be to add a helper spring, but in the short run I trust in high octane to keep me out of trouble
(BTW, I found out that Maine Sunoco dealers do no sell Ultra 94, or a least not in the "winter")
Is this plan sound???
Chris
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