I also have .1 to .2msec less on bank 1. I have to WBO2 right next to factory NB's. I notice AFR is also about .2 to .4 lower on bank 1. So, my initial though is the NB sensor on bank 1 reads a little leaner.
So the PCU can correct each bank independently, how does it do this? I guess no parameters are controlled therefore its just looks at each side with the values of the sensor inputs and deal with them independently.
I this is question is a little acedemic because I'm just searching for knowledge. I will swap the factory O2 between banks and see if the INJPW differents moves with the sensor.
Ed