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The knock zone in the high octane map gives the ECU the ability to retard timing when knock is detected. Just remember that this is only the case when it is accessing the map in the knock zone. This all happens well before it kicks into the low octane map. But, when excessive knock is detected (after retarding the timing by 4 degrees), it THEN reverts to the low octane map. Now, say for example that the timing is at 24 degrees in both of the maps for full load. It will retard the timing down to 20 degrees and then bump into the low octane map. But the value there is 24. So then it bumps back up to 24 degrees! So the timing actually will increase when it goes to the secondary map! Since it was knocking at 24 degrees way back in the high octane map, it will certainly knock again now that its running 24 degrees once more. If this continues, and you have a boost controller which will maintain the high boost, the timing will again retard to 20 degrees (because the low octane map also has a knock zone). But the fact that it went to the low octane map even with timing at 20 degrees means that it will continue to knock at 20 degrees of timing while in safety mode. What should happen is the low octane timing map should start at a maximum of 19 degrees. So if it continues to knock, it can reduce the timing to as much as 15 degrees.
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[ 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."
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