Timing Retard Question on L86 Yukon Denali

[WingsAA]

Attached a couple logs from today that captured some KR.
I've been adjusting variables (timing, driver demand, etc.) but am wondering if what I'm seeing is due to my virtual torque needing adjustment in those areas.
I'll go for for several days with zero recorded KR and then today when I was able to get on the highway and stretch it to higher cruising speeds... that's when it seems to appear. Cruising at 75~ + with typically around 20-30% throttle. Never see anything at WOT. Also, no real difference in logging if I'm running 93 or e85(80% content).

Other side note.. I'm in the DFW area so it's hotter that hot now but temp doesn't seem to be impacting.

Wanted to share the logs and see if there was any thoughts. I'm still not sure I'm interpreting the Tq. figures correctly in the logs and honestly, my eyes are going crossed at this point.

Files are too large to attach so linking to my Google Drive folder: https://drive.google.com/drive/folde...usp=drive_link

Thanks in advance.

[GHuggins]

Are you actually hearing any of this knock? I only see 3 to 4 degrees peak in the one log. I didn't even see timing going negative on tip in to indicate bad carbon buildup or anything like that. If you're not hearing it and you've already raised the tm in this rpm area you can always detune the knock settings very slightly. Logs themselves where I looked appeared to look good fueling wise.

[WingsAA]

Are you actually hearing any of this knock? I only see 3 to 4 degrees peak in the one log. I didn't even see timing going negative on tip in to indicate bad carbon buildup or anything like that. If you're not hearing it and you've already raised the tm in this rpm area you can always detune the knock settings very slightly. Logs themselves where I looked appeared to look good fueling wise.

Thanks for the reply.
I'm not hearing anything or even noticing differences in driving characteristics. I'll double check the tm in this area.
I've already detuned the knock settings to the attached reference for all cylinders.

knock_settings.jpg

[STAGEUP]

If this vehicle is stock and you're seeing "blips" of knock at cruising speeds, don't worry about it

[WingsAA]

If this vehicle is stock and you're seeing "blips" of knock at cruising speeds, don't worry about it

Yep, stock no internal engine mods. Thanks for the reply.

[WingsAA]

Quick Update...
I upped the Driver Demand slightly in those Accelerator Pedal Position/Vehicle Speed sections that were causing problems and seems to have eliminated the issue.

Hope I don't jinx myself by posting the update

[WingsAA]

Well, it's still there...

23-07-25 20-14-19.hpl

[STAGEUP]

Yep, stock no internal engine mods. Thanks for the reply.

You're still on it huh? ha ha

[WingsAA]

You're still on it huh? ha ha

I know... I have no life. lol

[Alvin]

If you tuned a engine to where you never see any knock ever..

You have either completely neutered the engine.. or you have bad knock sensors.

Quite ok to have random knock here or there. As long as you can't make it do it, it isn't consistent, you can't hear it, etc.

[WingsAA]

If you tuned a engine to where you never see any knock ever..

You have either completely neutered the engine.. or you have bad knock sensors.

Quite ok to have random knock here or there. As long as you can't make it do it, it isn't consistent, you can't hear it, etc.

I do appreciate all the feedback. I should probably just stop taking the laptop with me for a while.

[Estep40511]

I do appreciate all the feedback. I should probably just stop taking the laptop with me for a while.

Youd be shocked if you saw the KR you see on stock GMs while driving. Stock LT4s are horrible, some worse than others. They all have it. random though. Id say just drive it....

[1badc10]

Leave it alone & drive it. I see random blips while cruising 65-80mph, depending on throttle variations? sometimes with a little increase to the throttle to pass. Nothing detrimental on my end.

L86/8L90 ?15 Yukon Denali 😎