Truck runs tremendously better than in the past with the changes to using stock bias table and converting WB results to stoich 14.47 for E05 for AFR error tuning of VE and MAF. That aside, with all the negative PR about PLX I bit the bullet and purchased an AFX WB with the Bosch sensor to eliminate further error or doubt about the WB.
In the stock Bank 1 bung I have a fairly new Bosch WB sensor simulating a NB hooked to the PLX M-300 controller (truck was tuned using this setup). Yesterday I added another bung in the same bank 1 right above the stock one. I put the new sensor hooked to the AFX controller in that one. I free-air calibrated the sensor for 45 minutes before installing it.
I recorded 40 minutes of driving including comparison between the two widebands. The averages adjusted for E05 for averages less than stoich commanded and at stoich commanded are in the attached pic.
Also attached is the scan log from the drive.
The question is do I believe the STFT averages are close enough to zero to say keep the PLX and send AFX packing or do I believe the LTFT averages keeping the AFX, installing a stock NB in Bank 1, and convert the PLX to a paper weight?