if you look at it closer, the banks are fighting each other. bank one will go lean and then richen up the bank two drop down to 100mv and so on

 

Yea thats what I'm seeing too. Not much I can do without moving the bank two oxygen sensor to the log I'm guessing.

 

It will read the same either pre turbo or post.

 

i was just looking over over one of my logs and my o2 sensors are doing the same thing.

week or two ago when i was tuning for e85, all fueling corrections were off got everything within 1-2% and my wide band reads a steady 14.7 all the time, i turn stft back on and it starts reading 14.2-15.3

my truck is still at the body shop now, but should have it back soon, i will probably just keep it in Open loop

 

Not if the log is split between banks like Atomic is running. That seems like a pretty neat set up. I will tune the cruising cells with a wideband in open loop and then let the stft be crazy. They still control fueling back to stoich like they should, it is just weird for me to see the banks so different and bank two being anywhere between 0%-15%


If you put a wideband on a stock vehicle in closed loop your wideband would do the same thing. It is just how the pcm controls fueling so there isn't anything abnormal about that. I will always keep it in closed loop for the reassurance.

 

Actually narrowbands are inaccurate at stoich. They are only accurate slightly rich or lean of stoich (its called a deadband).

 

You can split that hair if you'd like. At the end of the day, I trust my narrowbands to find stoich before my wideband.