Experienced Haltech but New to UpRev

Unclemeaty

With those numbers, I'd strongly suggest you dont go by what your WB sensor is telling you. 17s should only been seen under mild deceleration or perhaps on emission systems with air being injected after the engine but upstream from the O2 and Cats. Even a narrow band O2 sensor should not read that lean. 17s is almost lean enough for missfires let along detonation.

I say get your O2 sensor fixed, replaced, or calibrated. Dont try to tune with it.

In Stock form without any problems; running strong and not tuned or anything, your 370z should be reading around 11.75 to 12 AFR at WOT. Your other vehicles should be somewhere between 12 and 14ish I supose.