Can you guess at AFR with stock o2's?

[JasonB]

To be more specific, I'm wondering what type of results are found when using a wideband o2 and comparing it to the stock o2's.
I'm sure someone has done this, how far off are the stock ones?

My car is currently reading 11.41 AFR at wot using the scanner and stock o2's.
If I scale the PE multiplier vs RPM leaner it gives a better seat of the pants feel at wot.
I'm only taking it up to 12.8:1.

[txhorns281]

if your hunting for 13.0 AFR then most people say 890-900mv is where that is accomplished. It's a good general place to shoot for, but can't be completely accurate. I wouldn't trust it much though cuz for some 890mv might be too rich, or too lean depending on how their o2s behave.

[MNR-0]

I get 890mv at 12.1AFR. So the O2 sensors are just plain crap for anything but stoich tuning.

[txhorns281]

I get 890mv at 12.1AFR. So the O2 sensors are just plain crap for anything but stoich tuning.

eggzachary.....

[jimmyblue]

It depends more on exhaust temp than mixture out there,
you would not want to bet on any other exhaust / platform
configuration being close. However for what it's worth,
880mV was 12.7:1 on my stock '02 F-body log manifolds.

If you're looking for better than +/-0.2 on the AFR, you're
kidding yourself I think. Even same-platform. For different
plumbing, ???