Quote:
Originally Posted by PatrickfromMD
Very useful, thankyou for the contribution. I was unaware the computer would essentially squeeze every last bit out of the available octane.
I interpret from your reply that the PCM will interpret anything beyond a certain voltage threshold (as read by the piezo electric sensor) as detonation. The higher the voltage beyond this threshold, the more the detonation. This should be easy to monitor (with the right equipment) and therefore settle on a grade of gasoline appropriate for the driver wants to achieve.
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pretty much. the thing to remember tho is that the pcm will advance it to a point that it can sustain and will retard from there. I will consistently see up to 48* advance in my LT1 and the 2 times ive ever had any knock retard, I still had 46* advance showing on the data log, but I had 7* of retard so my overall advance was only 39*
but as a general rule, the computer will advance until it gets knock and when it does it will pull timing back then gradually allow it to advance to its limit.