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What is the best wide band O2 to use for tuning diesels to get the lambda reading, Make and model if possible.
Should you log both banks or is logging both banks as one ok?
Logging one bank or post turbo entirely seems to do the job. We don't need super high precision, just enough to know if our target lambda and actual are close is quite useful. I've used the AEM stuff successfully and it integrates into our datalogger (HPTuners) nicely. I'm not sure what you're tuning or logging with but data integration capability would be worth investigating before pulling the trigger.
I am using HP Tuners MPVI 4, trying to get the best wideband available. Doing mostly diesels but I have done some gas engines also.