Help me avoid SD only mode? Another E38 idle thread

[Alvin]

2007 LC9 5.3 DoD Delete
Truck Norris cam


It feels like no matter what I do Closed Loop wants to cut fuel at idle

Wideband always trends lean..

I have tried adjusting O2 sensor settings and cannot get it to comply.
side note: Integrator settings are not available on my ecu

I have tried cutting the VVE table at idle rpm.

Is there a way for me to trick this thing into cooperating, or should I just let it run lean?
My inexperience makes me afraid of SD only mode.

I will attach pics logs and tunes below once I get them sorted

I haven't read every reply in here.. but just incase you or anyone didn't know.

In closed loop the engine is deliberately switching back and forth to lean to store o2 in the cats. If there is no o2 in the exhaust none of the left over HC's can burn. So when you average a wideband over a well tuned closed loop car it will come back a touch lean. This isn't a problem.

[Alvin]

Also.. That setup will do fine with or without the MAF. It's when the cams start getting a big bigger than SD is a better choice.

Rough rule but something over 230d intake duration start to turn out much better strict SD

[lsxjunkie]

LTFT+STFT math

Use that Math in a VVE histogram to tune closed loop part throttle? What if you disable LTFTs

[TragicMike]

In closed loop the engine is deliberately switching back and forth to lean to store o2 in the cats. If there is no o2 in the exhaust none of the left over HC's can burn. So when you average a wideband over a well tuned closed loop car it will come back a touch lean. This isn't a problem.

Good info!
Thank you.

[Alvin]

store might be the wrong word.. Bottom line.. no o2, nothing else can burn. so that is why it deliberately cycles lean in closed loop.