Too many sensors, not enough room

[vzsv8]

My car (LS1 VZ Commodore, Australian) has its cats mounted very close up to the exhaust manifolds. The oxy sensors pass through heat shields that cover what little pipe there is and I want to add a wideband.

Has anyone added a wideband to a VZ? If so what about the heat shields?

My wideband can act as a narrowband simulator, so this is option 2.

Left field option, could I just use one oxy sensor to run 2 inputs on the PCM, presumably the PCM has at least 1Meg Ohm of input impedence so it should not load the sensor voltage.

Lastly I have attached a pdf of the engine wiring diagram and to my eyes the PCM does not monitor the sensor heater, so I should be able to use this to run the wideband controller.

Thanks in advance, Steve

[joecar]

No, I haven't done this on a Commie...

No you can't drive the two PCM NBO2 inputs from one NBO2 sensor...
the PCM wants left bank and right bank distinction otherwise it will confuse fueling.

According to that diagram (is it a "true" diagram from GM...?) you can power your WB from the heater power/ground circuit...
you can do this only if the PCM does not control the heater circuit.

Do you have an LC-1...?

Put the sensor thru the heat shield in place of the original, wire 1 channel to PCM NBO2 input signal...
you will need a plug (similar to attached pic, but may be different with year/model) and MetriPack pins.

Wire the other channel to FlashScan AD1+ and Ground/Return to AD1-/GND to get analog AFR...

Or if you have FlashScan V2 and your WB supports serial AFR, then use a serial cable (may need a null modem adapter, or modification).

[vzsv8]

Well, that was quick.
The wideband is a Techedge 2J1 which does have serial output, so I will crimp up a custom cable to connect to the V2 for some of that good ol blackbox logging. BBL is really the best feature, it removes the need for the laptop, and the wife to hold it
The diagram I posted is genuine GM but it only covers up to VX series 2 (2003?), I, found....the whole thing on the internet, it was lonely and needed a home.
To test I unplugged to sensor and it produced only an O2 code, no heated code, so it appears to be current. The colours still are.
Looks like it is NBsim for me then.
Thanks again, Steve