I've researched and can't find exactly what parameters set command AFR at startup in closed loop. I noticed in the very cold weather on startup commanded AFR is going to .55. On start up when under 40* I am seeing .60 eq ratio and rough idle for about 20 seconds and commanded AFR slowly moves up to 1.00 and runs fine. What can I adjust to lean out the startup? VE and MAF are dead in when warm.
2013 CTS-V Coupe M6 - 1 7/8" Headers, 3" x-pipe, stock mufflers, Airaid intake w/green filter, ID1050X injectors, DSXtuning flex fuel kit, DMS under hood tank, upgraded pump, 3/4" lines, griptec 2.4" pulley, solid isolator, 100mm idler, reinforced brick, MM mild catch can, AEM 30-0334 wbo2, 600whp/630wtq
Open Loop and IVT open loop
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
I guess that is where I am confused. The logger says closed loop active is yes when I start. And the open loop for alcohol and gas shows rich in the cold engine temp areas. They are all above 1.00 which should be rich correct? Yet I am commanding .55 lambda in the logger.Originally Posted by GHuggins
alcohol.png
Last edited by JayRolla; 02-16-2024 at 08:41 PM.
2013 CTS-V Coupe M6 - 1 7/8" Headers, 3" x-pipe, stock mufflers, Airaid intake w/green filter, ID1050X injectors, DSXtuning flex fuel kit, DMS under hood tank, upgraded pump, 3/4" lines, griptec 2.4" pulley, solid isolator, 100mm idler, reinforced brick, MM mild catch can, AEM 30-0334 wbo2, 600whp/630wtq
I think where the confusion may be is this. Open loop (greater than 1) is a multiplier to add that much more fuel. On your wideband, less than 1 is rich and greater than 1 is lean. In the cal, it's a multiplier, not a commanded lambda. If it's indeed showing richer than something around a .97ish lambda then all you need to do is take a touch out at a time until you're happy with it.
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
That makes sense. I was looking at the table wrong. Thanks!
2013 CTS-V Coupe M6 - 1 7/8" Headers, 3" x-pipe, stock mufflers, Airaid intake w/green filter, ID1050X injectors, DSXtuning flex fuel kit, DMS under hood tank, upgraded pump, 3/4" lines, griptec 2.4" pulley, solid isolator, 100mm idler, reinforced brick, MM mild catch can, AEM 30-0334 wbo2, 600whp/630wtq
Just copied the gas over alcohol tables and commanding.87 and hitting around .95 after cold start. Much better. Thanks again.
2013 CTS-V Coupe M6 - 1 7/8" Headers, 3" x-pipe, stock mufflers, Airaid intake w/green filter, ID1050X injectors, DSXtuning flex fuel kit, DMS under hood tank, upgraded pump, 3/4" lines, griptec 2.4" pulley, solid isolator, 100mm idler, reinforced brick, MM mild catch can, AEM 30-0334 wbo2, 600whp/630wtq
No problem. Glad you got it worked out! You can fine tune the stft initial open loop operation where fuel trims start kicking in via the IVT open loop table if you need to adjust it any further.
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
I had to turn down the IVT and OL tables as well once I went to an E blend. I was wayyy rich as well in colder temps. Typically if you just multiply your IVT value by the OL table value (at your corresponding temps) that should get you very close to your commanded EQ ratio while in OL. I know there are a few other multiplier tables, but just going off of my experience.
Last edited by sgod1100; 02-26-2024 at 01:27 PM.
In case you'd like to use logs to adjust, the term is called phi. FAR instead of AFR. Phi is the inverse of lambda, or 1/lambda. You can create a custom math function for it in order to track with the wideband.
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