Contour Enthusiasts Group Archives Forums Modifications Forced Induction Apex'i Turbo Timer - O2 readings... How accurate?

As posted in Stazi's S-AFC wiring how-to, I've connected the Turbo Timer's O2 monitor wire to Pin 87 of the ECU. My questions are:

What exactly is that monitoring? Raw O2 voltages? Bank 1, Bank 2? "Blended" O2 readings from both banks?

And, how accurate is the reading? I realize these are only narrow band O2 sensors... Not the best for tuning.

The reason I ask is that with the regular burn of the ADC turbo chip, any time I get on the throttle, the damn ratio drops to 11.0:1 or, at worst, 10.3:1. Is this to be believed? Is the ADC chip running me that rich? When I get the new chip (you know, one that actually opens the @#()!*&$!@# secondaries?), I'll have a bit more of an idea at top end what I'm dumping into the engine.

BTW- Ping is VERY apparent when it's hot or when I've been at constant speed for a while and blip the throttle. Sounds like 5-10 spraypaint cans all being shaken at once. Of course, I'm off the throttle like a hot potato when I hear it, but still... Sounds like a busted tune of the chip?

Dan that's the bank 1 sensor IIRC and yes it's pretty accurate beleive or not. I compared it to the wide band on the dyno this year and it was within +/- 0.1 on the A/F ratio.....

Sounds like too much fuel and spark on your tip in on the tune you have.

You know when it is hot and I'm adding just a little throttle I can sometimes get a ping but when I advance the throttle to full it will go away as either the timing is adjusted or the fuel is added. I'm guessing that only wide open throttle was tuned and that part throttle is not optimized in my case and maybe not in your case.
I wouldn't trust a narrow band O2 sensor. They are vary too much in voltage from sensor to sensor. I'd have to see more information before I believe that it would be accurate.