reducing burst knock

**SgtMarshal** · 02-20-2017

I've taken a few scans of my car and seem to have a bit of kr. I'm wondering if it is burst knock because I have cut timing a few times with no noticeable effect. One person suggested to 0 out the burst knock table because it isn't real knock. The only problem is that he can't remember what tables he adjusted and I don't see an LS4 specific guide on what tables to change and what to change them to. here is a screen shot of the knock retard page in my tune:

https://drive.google.com/file/d/0B6K...ew?usp=sharing

**BoostedPontiac** · 02-20-2017

How's the lower motor mount or trans mount? I had random knock all over with my regal that couldn't be tuned out. Turns out it was a bad motor mount. Once I fixed it, no more kr

**Fivefingerdeathpunch** · 02-20-2017

Log Burst knock if you think it's what is happening.

Base vs cylinder air delta is the main table. Cut it in half or more, or just remove it all.

**SgtMarshal** · 02-20-2017

will the burst knock retard show up as actual knock retard? I'll try logging it first and see what it shows.

I haven't checked my motor mounts yet, but it could be worn

**Fivefingerdeathpunch** · 02-20-2017

It will show up on both knock retard and burst knock if you log them. There should even be a type of knock retard you can log to see what the computer is saying I think.

**SgtMarshal** · 02-20-2017

I just cloned my knock retard graph and replaced the knock retard with burst knock.

**Fivefingerdeathpunch** · 02-20-2017

What?

Not sure what you are doing. I was just saying to log both knock retard and burst knock in the main channel display. See what it says when you take a log. Likely you'll end up just zeroing out the burst knock table so it's a non factor while tuning.

**SgtMarshal** · 02-20-2017

I understand

**SgtMarshal** · 02-22-2017

I added burst knock to my graph and chart, and only saw .1. I wonder if something is loose because I cut several degrees of timing and it didn't seem to affect the kr much.

**Fivefingerdeathpunch** · 02-22-2017

Post the file and log in a drop box or something so they can be viewed.

I don't think you can add attachments on this forum but you might be able to.

**SgtMarshal** · 02-22-2017

I'll start a thread on hp tuners forum

**mguzzo** · 02-22-2017

what's the PID for logging burst knock?

**Fivefingerdeathpunch** · 02-22-2017

Originally Posted by mguzzo

what's the PID for logging burst knock?

It's only going to work if you own a LS type vehicle. Burst knock is not used on a 3800.

It would just be labeled burst knock in the main channels list.

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