Technical O2 sensor Qs

[510fever]

I run Apexi PFC with the O2 sensor feedback disabled (ie open loop) Despite the fact that I am not using them, I notice the stock o2 sensors report strange results.

First, they seem to range between 0 and 1.4 volts. I know the car uses titania sensors with a range of 0 to 1 v. How is it possible to be returning more than a volt? Both sensors were replaced last year with NTK non OEM titanias that I just spliced the connectors too. I am sure they are wired correctly because both read near 0 v on decel during fuel cut.

Second, if I temporarily enable feedback, the car runs lean (17:1) and the O2 sensors report 1.3 and 0.6 V respectively. Could the strange high voltages cause the differing voltages? Does the ECU average the signals?

THird, if I use the narrowband output of my wideband as the ECU O2 signal, will the APEXI PFC disable feedback at a specific throttle position? In other words, if I enable feedback control and the engine cruises at stoich will it revert to the fuel map and run rich when I stomp on it?

Thanks

[510fever]

Any info to any of the above Qs would help

[R32GT-R]

as in one reads 1.3v and one reads 0.6v , if thats the case mine also read roughly those voltages

[510fever]

Here's a bit of an update. I installed and wired in a zeitronix wideband. Spliced the simulated narrowband output into both the stock 02 lines. The car, using PFC, definately adjusts its fueling in closed loop (ie switches or dithers) but a problem remains. The fueling sweeps are so large that the car surges or pulses while driving it. THis could be caused by one of the three following reasons (or any other)
1. The zeitronix simulated switching rate is too slow or doesn't react quick enough, allowing the PFC to overshoot while going lean and rich
2 Having the wide band located in the downpipe after the collecter gives too much of a transfer delay since its further along in the exhaust and permits over shoot as above.
3. Splicing the same voltage to both o2 inputs is confusing the PFC

What are your opinions?

I should add that PFC definately reverts to base fueling when the pedal is pressed past 50%