too lean ?

@AndyF, thank you but that does not describe why it “has” to be dbw. I see it working just as well with drive by cable, simply because it would just have to wait for certain driving scenarios and conditions before parameters are set. Kind of like current ob2 diagnostics. For all of the monitors to be “up” and ready certain conditions have to be met. My AEM infinity is the closest I’ve seen to real self tuning. It uses o2 feedback to trim the fuel table and suggest a “new ve”. Although you do have to target certain afrs in different areas of the map.