Burst knock issue

[dreksnot]

I thought BKR was there to prevent the potentially, anticipated knock that could occur with the sudden inrush of air. I see a lot of folks disable this entirely, as well as I did, because we don't get that anticipated knock (at least I've never seen KR because of stabbing the throttle). Is there any other reason to keep this enabled?

[cc-rider]

so, do have yours enabled?

I have mine disabled. But I am trying to get it working again. I was running a SD tune and tried to enable it. It went bat-shit crazy on me and kept triggering. Clearly something was off in the tune for it to work correctly. I am now dialing in my MAF and will then try to turn it on again to see if the SD tune had something to do with it.

[10_SS]

Does anyone know if the fact that I'm running a SD tune with the MAF shut off have anything to do with this issue I'm seeing (where BK is repeatedly triggered)? Perhaps it needs the MAF to work properly?

I have the same car, engine, different PD blower, and yes the Burst Knock doesn't work right without the MAF. I get the exact same harsh timing pull, continuously in SD mode. You need the MAF for it to work right. I played with the Burst Knock a little bit, but didnt help, and read somewhere this is just the way E38's are in these cars.

[cc-rider]

Thanks 10_ss. I figured it had to do something with the MAF. It was absolutely clear that it was useless in SD mode. Good to have this confirmed.

I'm now afraid that the burst knock function is intertwined with predictive coefficients. Which it seems nobody has figured out yet. Going to dial in my MAF a bit more and try turn on BKR again (with predictive coeff's still zeroed out) and see what happens.