Or increase octane and see if the knock reduces.
Or increase octane and see if the knock reduces.
Originally Posted by GBull
Right. SD mode uses the Low table. Make changes to the Low table and see.
Burst knock is disabled.
Ok, I see I failed to make my high/low octane tables the same on this last evolution. I am aware that the low octane table is used just made an error. A couple more rounds should tell the story. I think I'm going to blow a nice blended hole out in this rpm range down to about 10 degrees. If it stops I'll work my way up. Appreciate the attention on this, I'd like to move on..!
10 degrees lol don't do that. 18 min or there's something mechanical/sensor related. Try like this.
Thanks I'll try today. Hey Ya know that's exactly what I had and forgot to move to my low octane??
Last edited by GBull; 12-19-2024 at 12:49 PM.
What steps do you take to disable burst knock?
Spark>Retard>Burst Knock Retard>vs. RPM = 0
Thank you.
I only looked at ECM12760 and it looked like it was opposite of disabled and I didn't look at the burst vs rpm.
Spark Retard>Burst Knock Retard>vs Rpm, Set to zeros. I logged Burst knock for a while and it never came back.
OOPs. I didnt see SiriusC1024 responded.....
I had no retard on this timing config. I'll see if it's repeatable tomorrow. Feeling better about it.
I tried to make my first run at OL MAF tuning with my wide band using lambda but I failed to get the short term fuel trims to stop. Can you help me out here? Ugh I see I didn't set Closed Loop Enable Coolant Temp vs IAT to 284... that's likely it...
Last edited by GBull; 12-20-2024 at 01:52 AM.
I've done a couple maf logs that I would appreciate you looking at. I cleaned the maf sensor first. The air intake is a K&N and the maf has been de-screened, which I know is not in my favor. The two logs are back to back with no changes to the tune. They don't match up that well and I notice an oscillating pattern through the Hz range. Maybe some of this is ok but I suspect likely not. Another question I have is about my maf histograms. One is Mass Airflow Freq vs Lambda error(the one I used). The second one is Mass Airflow Freq vs Lambda error with filter(JUST noticed this one) [USER.9005]*100-100. I am revisiting this from 10yrs or more ago and don't remember what this filter is for or where I got it... Can you enlighten me?
In the positive my timing seems good. I get an occasional retard in the tenths of a degree that are not even happening in the peak torque range. I'm massaging those back as I find them. Again the peak torque range has been clean of retard--thanks for that.
The SDOS may be my favored option..
Ah. You need to set Airflow>Dynamic>High RPM Disable to 200rpm so that full MAF is forced. Below 4000 it's in hybrid with VE making contribution.
For WOT fueling it's easy. Click 'View Zoom Data Range Only' button in the top of the output table. Zoom in on a WOT run and use the wideband error there. For CL just use fuel trims as with SD. No need to filter.
Don't tune OL. OL/PE will happen when commanded by Power Enrich enables, and that's where you use the wideband. Re-enable CL and PE settings like before.
When doing the wideband portion disable LTFT so trims aren't carried into PE. STFT only.
If you want to use the wideband route for the entire range then go over it afterward with CL enabled. It's going to run with CL enabled, so fine tune the trims during CL.
Last edited by SiriusC1024; 12-21-2024 at 01:54 AM.
Thanks for the guidance, I've read many times how Maf is sooo easy... I wonder how many really understand what is going on. I sure didn't... I'll revisit this tomorrow evening and do another log or two and see how it responds
I did a couple maf logs. Here's the most current with changes to the tune. Everything fell into line quickly. Is more work needed here? I think the maf curve looks pretty good with no smoothing.
Really should smooth the MAF. Do it by hand. Run another log to confirm changes. Looks good on trims.
After that restore high rpm disable to 4000. Turn LTFT back on. DFCO ECT enable back to stock. Make a low octane table.
If you feel like it handled better pure SD lmk I'll show you a couple things you can adjust. That or go SDOS.
Last edited by SiriusC1024; 12-22-2024 at 02:05 AM.
The Maf check after hand smoothing looks good. Curiously, I took a look at the LTFT SD table and it doesn't look near as good as the Maf...? What's your take on that? I have a licensed SDOS that I will set up and I plan to keep the original tune as fully functional. I'll drive each one for a while and do some mileage checks, and see how each feel. Then choose
Still getting hit with some retard, f*ck... that just won't let up on me lol. Pulled 1+ degrees out in the max torque area and drove again. No retard... time will tell if it stays clean..
Last edited by GBull; 12-22-2024 at 10:48 PM.
You put in TR6 (iridium, platinum) plugs right? Try lowering PE to 70kPa.
Yes, will do.
I have a knock sensor question..or two. In the 'Knock Sensor Level vs RPM Cyl' from 3200 rpm and up some of the values are less than stock, if I understand this correctly the knock sensors would be more sensitive. What I don't know is how Global Gain effects the other tables. Some of the Global Gain values in the mid range also would seem more sensitive than stock. Do you mind looking through the knock sensor tables one more time to see that they are where you want them?
It's level multiplied by gain. So where you're seeing I have 9.0 the other tune is effectively 9.5. You can go up as much as you like, but keep in mind this looks like real knock.
KR happening with sustained load is why I asked about plugs and suggested lowering PE threshold. Where are you at on this?
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