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retard the timing by as much as 4 degrees from where it is set in the map. Think about this scenario for a moment.
You have a boost controller. You are running 16psi. Its making good power. Detonation in this condition will quickly be fatal. So the system detects knock and tries retarding the timing by 4 degrees, and then it switches over to the low octane map. Do you see what will happen if the low octane map is the same as the primary? Since the low octane map is the same as the high octane one, the timing point it uses will be identical to what it was when it originally detected knock in the high octane map. At this point, the timing is now 4 degrees higher than what it was after retarding it in the primary map. So when it switches to the low octane map, its doing this because that map is supposed to be less agressive. The ECU doesn't look at it and say its not going to use it because it is the same, it just starts using it regardless. The idea of the low octane map is to provide additional timing retard and fuel enrichment in the event something isn't right. By making the low octane maps the same as the high octane maps, you are cutting its safety ability in half.
[ ashleypowers.com ]
[ agpowers@bellsouth.net ] [ Zemulator Information Sheet ] When pigs dance, you better get it on video... "You never really learn to swear until you learn to drive."
-George Carlin
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