Knock Retard On Throttle Close

[hymey]

Turn off burst knock, And adjust your KR sensitivity values.

[swingtan]

JezzaB and I have talked about this a bit and we did discuss Burst knock. My understanding ( which may be wrong ) was that burst knock would not effect the octane scalar level, as it was actually a "predictive" knock not a "measured" knock. If this is the case then this can't be burst knock as the octane scalar value rises when the knock occurs.

Note that for the E38, the octane scalar is a factor, not a percentage. The octane scalar for the E38 should always be "0" ti indicate there has been little or no knock retard.

I'm happy to be proved wrong on this, I'd just like to understand the why it's occurring. Have you seen this or is this just a suggestion?

Simon.

[hymey]

I think you are right there swingtan. I have found that IAT get high and that pulls timing. And knock further reduces timing.

Infact I temporarily switched of the knock sensors and found the motor would ping on the high octane table from factory on 98ron fuel. When ECT was lower(around 80) it would not knock due to IAT being lower. Once it rows to the usual 95 deg C the motor would knock easily. I guess due to the combustion chamber temps being so high that it would initiate knock much more easily.

I had to lower my timing a little everywhere until pinging stopped then turned the knock sensors and no more knock now.