Idle STFT confusion

[Mud]

Hi, I'm a bit confused about what's going on with my idle. Pictures tell the story...

Closed loop screenshot
Open loop screenshot

Closed loop, the NBs are pulling fuel out via the STFTs and making me go lean. Is this normal? The idle gets increasingly unsettled as it leans out. Also, what's causing the STFTs to suddenly jump back to zero?

Open loop, do my NBO2s look healthy? Seems odd bank to bank...or more likely am I down a spark plug/injector? I'm also not sure why it's progressively leaning out, ECT and IAT are almost constant.

Here's the spec:

LS1 with LS2 heads
222-226/115+3 .6"/.6" cam
102mm TB / FAST
Full exhaust, OTRCAI
LS3 injectors

I have just upgraded from COS2 to COS3, thinking I should try open loop around idle, although it doesn't seem to have taken (the closed loop shot is in fact using COS3, with .98-.99 lambda commanded below 1200rpm). I'll do more reading there, but is this a good strategy in general?

Files:
Open loop tune / log
Closed loop tune / log

Any help much appreciated - I read a lot, but don't get much time to try things out...so sanity checks/pointed advice where to look would be great.

[Mud]

PS., no MAF.

edit: I guess not having B4205 maxed is why my COS3 semi-open loop didn't take.

[joecar]

...
edit: I guess not having B4205 maxed is why my COS3 semi-open loop didn't take.

No, that's not it... something else is going on... try setting B4105 to 450 mV all across



SOL will occur in OL with any B3647 cell that is stoich regardless of B4205 (CL temperature enable) or B3801 (LTFT enable (implies CL)).

[Mud]

Ok, set B4105 to 450mV and put B4205 back. LTFTs are disabled. I'm still getting trims at idle, they only seem to be at zero on DFCO.

Here's the current tune / log.

[Mud]

I'm honestly confused as to whether I'm CL, SOL or what right now, but the STFTs look active and the AFR is basically behaving. I should stress that the car drives mostly very well, I'm just trying to understand the inconsistencies between the banks and see how smooth the idle can be.

Fresh screenshot.

[joecar]

SOL only happens in OL when table B3647 has cells that are stoich.

[Mud]

So should STFTs stay still/at zero when in non-stoich cells of B3647, or do they vary but are ignored? Am I missing a tutorial on this or should it be obvious? I'm commanding .98 lambda at 1200rpm and below in the above screenshot.

[joecar]

Also log HO2S21, SPARKADV, KR.

[joecar]

If you look at HO2S11 and HO2S21, you will see that STFT go to zero while HO2S11/HO2S21 stop switching;


i.e. STFT trimming occurs only while HO2S11/HO2S21 are able to switch.

[Mud]

I've added those PIDs back in, will log those tomorrow (the above logs were my minimal VE PIDs with few additions).

I can see that the STFTs are zero when the NBO2s go low in DFCO, but I still don't understand - I'm commanding .98 lambda at idle on B3647, so this should be out of SOL - but STFTs are still varying...am I in CL for these cells then? Hence my comment before on disabling CL by maxing out B4205. I want OL on idle.