BP turbo build/advice

jwick

That doesn't make sense. Closed loop fueling is determined by the trim fuel O2 sensor which is the one on the OEM header. You didn't move that at all with the install.

Now he could be taking about the O2 sensor which should be post-cat which are now in the same bank. In theory those aren't supposed to do anything but measure that the cats did their job. In reality I believe they do more than that.

I'm not clear on exactly when you are having said issues. In closed loop the car should be running feedback loop from the fuel trim sensor. My closed loop AFR always bounced around a lot, mostly at idle, but it would happen closed loop at speed too but not as bad.

My solution, remove the post-cat O2 sensors and go on with your life. I did and my idle has been rock solid ever since.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build