Hey guys new to your forum, some may know me from CII but i have a question about my new tt. I was wondering what numbers I should be seeing for my A/F and o2. right now the A/f stay pretty constant but my o2 number bounces around everywhere at idle. just thought i would see what you may see. Thanks

jordan

from what I can recall (and I wouldn't put any stock in this info) that is pretty normal.......ours did that too...of course it could have be installer/operator error too though oh, and welcome to the board!

Katie is right. Its normal.

isn't it due to the constant re-adjusting of the ratios?

Yep, the O2 trim is always trying to keep the fuel ratio stoichmetric in closed-loop mode to maintain good power and gas mileage.

Closed loop = bouncy-bouncy.

I like the way Taboo on DSMtalk put it. Tuning by narrowband O2s is about as worthwhile as tuning by battery voltage. I say use it as a ballpark only. If your going to tune, use timing advance and knock counts. We do all know from my car though, .98 on a narrowband is really rich If your seriously wanting a number, you'll probably find best results between .86-.94. That's the best I can give you. Like I said though, I wouldn't go by it.

well i played with it last night and the A/F sits around 14.5 and the o2 reads all over until you hit wot than shit will hit a constant number usually pretty high i think it was in the 9's. so yeah she is pretty rich. thanks for the feedback. and there will be no tuning with this.