S-AFC Doesn't Affect o2s

[SinaiTSi]

I just had the car dyno'd and tuned a week ago with a custom chip and a/f was just about perfect according to the wideband on the dyno. Now when I go to log on the street, o2s are a little too rich. What we're guessing is that my cat threw off the dyno wideband more than we thought. Anyways, I have an SAFC too so when I went to lean out the car for WOT, didn't change the o2s at all, they stayed rich. I'm not really sure why though.

 

[Black95TSIawd]

Your cat definitely through off the wideband reading. My advice, buy your own wideband and ditch tuning off the o2.

 

[SinaiTSi]

That's obviously the best way to go about doing it, but I don't have that kind of money right now and I'm basically just seeing if anyone has had much luck even with tuning with the o2s from a logger.

 

[GVR4592]

It's impossible to tune using data from a narrowband O2 sensor.

 

[SinaiTSi]

Well, not really tune. My tune is almost perfect, just a little rich across the board. My only question was why if I leaned things up a little now, it doesn't effect the o2s, when before it would. That's my real question.

 

[scottsee]

you have a 1g.. Tune for knock.. Get a wideband later..