Cammed car Idle tune with lean condition (Open loop at idle?)

[shinysun]

Hello

I have installed a mild cam on my Camaro ss 2017 and my AFR gauge shows lean around 15.5 at idle and the low rev.
I understand it is due to the overlap of cam.

1. Someone advised If Openloop at idle and adjust it, it is going to be the better.
However, I can't find the way going OL at idle. How can I mod it?

2. Smelly exhaust gas.
I think the main reason is Highflow cat, but I think also the overlap is claimed even AFR shows lean condition.
Can I reduce the stinky smell at idle by adjusting injection timing like SOI? I assume the gasoline vaporized and intake air are exiting through the exhaust valves at idle during the overlap.

[Higgs Boson]

1. you can set PE enable criterias to 0 and set PE lambda to 1 at idle RPMs but you shouldn't need to do this, it is old school. proper tuning of the MAF and VE is important.

2. yes.

[shinysun]

Thank you, Higgs

1. In my opinion, even if I do proper tune for MAF and VE, AFR shows lean condition due to the "bypass" intake air during the overlap , the O2 sensor will detect it and let ECU - injector shoot the more fuel.
Am I right? Could you advise how I adjust it?

2. Is it EOI or SOI? My SOI at idle is around 310* . Do I better mod it around 290*?

Thank you,

[Higgs Boson]

adjust your O2 delay criteria

SOI, yes you want smaller numbers to move the injection away from EVC, which happens later now with your cam.

[shinysun]

Thank you again,

Do you mean "Closed Loop Mode vs. Airflow"?

Ok. I will try mod SOI.

[Higgs Boson]

no, transport delay

[Ben Charles]

You can do open loop.. but gen 4 and gen 5 operates so quick even big cans I can do closed loop..

Get fuel right is about half the equation... then have to get TQ right... have to get fuel right first though