So I've got a single turbo setup with a narrow band in the RHS bank and a narrow band in the dump pipe. Been trying to get it to work in closed loop but one side just thinks it is rich and tries to lean out to compensate but it's already lean.
I was thinking to try and get the E38 to run the injectors in closed loop with only the narrow band in the dump pipe, just like the engines of the 1980-90's used to. I've tried disconnecting the narrow band on the RHS and then setting the DTC to No Mil Light so it stayts in fault but the ECM then only wants to trim one side. My only other thought is to put the RHS narrow band into the dump pipe as well.
Any ideas or is there a way to tune this properly in my current setup?