KR with E85

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Sep 14, 2012 | 03:14 PM

#41

salemetro

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From: Salem/Keizer

Quote:

Originally Posted by MontecarloDrag

Sometimes when I disable Burst knock, I get knock retard on the logs. I reenable it and the knock retard is gone with no other changes.

Don't know why, but it makes the PCM pull timing because of false knock. Not always tho

My understanding of Burst Knock, is that it's a reduction in timing based on an ANTICIPATION of knock, triggered by a sudden increase in air mass. If you're disabling it and seeing knock, my guess is that it's possible that you need to re-visit your base timing table?

Sep 14, 2012 | 04:04 PM

#42

joecar

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From: So.Cal.

Probably, but also there are other factors which cause/allow knock...

Sep 14, 2012 | 05:49 PM

#43

salemetro

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From: Salem/Keizer

Agreed. But all other things being right (target afr,pe ramp in rate, etc) would lead me to think of base timing being a little too high.

Sep 14, 2012 | 06:20 PM

#44

MontecarloDrag

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Quote:

Originally Posted by salemetro

The engines which had the issue, didn't knock with the same timing.
Burst enabled, no knock. Burst disabled, a few degrees of knock.
This happened with stock tables, even with a few degrees back. Don't know why, but it happened as soon as I touched the burst tables, didn't have to completely disable it, just a few degrees less and then KR

Sep 14, 2012 | 06:30 PM

#45

BLK02WS6

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From: on the dyno tuning in MD

I still say his problem is the fuel getting dumped on it as soon as it goes WOT - that is a pretty big dip in lambda. Plus, still can't even see what timing it is running... really need to see the scan, not a screen shot...

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