My theory at the time was the sensor feedback was turned off thus in thoery the ecu didnt need it connected
Would also explain why everyone elses cars have been fine as they all had 02's connected
But anyways now its fine so i can dial in it completely and get on with ecu based boost control now
that is strange because my s14 does get lean when i start to build boost then eventually gets rich after a few seconds but only when i have my o2 sensor feed turned on, thus ive been driving around with my o2 sensor turned off and my AF ration is where i like it. glad you got it all figured out tho