So I've been trying to figure this out for a few hours and maybe its just best if I ask. When no knock is detected in the E38 is it 100% using the high octane table? From what I've read the pcm is always using a blend of both the high and low octane and just deviates more towards the low when knock over a certain amount is detected?
That doesn't really make much sense to me as there would be no purpose of having a high table. I always thought the pcm would default to only the high octane table and if knock over the threshold in the tune was detected learn would kick in and it would begin to start to decay towards the low table.
In other words if you command 23 degrees and it sees 3 degrees of KR and your threshold is 2 then it will begin to decay towards the low table. If it saw 1 though it would do nothing except pull timing momentarily then continue to use the high octane table as the threshold of 2 degrees had not been reached to begin activating the low tables
Which is the correct method? Is it different in the e38?
Also if you completely disabled knock learn ( set all enable values to max) would you essentially disable the low octane table?