98cobra+75280z Posted March 15, 2012 Share Posted March 15, 2012 I am in the middle of tuning and so far I have my idle and under load AFR's pretty solid. However, and this is a huge however, the car when I am cruising will not hold a steady AFR. It oscillates from 12.5 to 16.5 and will refuse to level out. I am using tunerstudio VE analyze live and I feel like my fuel map is pretty solid, but wether I try to tune manually or use tunerstudio I can't get my AFR's to hold steady. What am I doing wrong, or is there something I am missing regaurding the tuning strategy. Thanks for the help, Kevin Quote Link to comment Share on other sites More sharing options...
Leon Posted March 15, 2012 Share Posted March 15, 2012 Disclaimer: I'm no MS expert, nor have I even played with it. Sounds like there is some closed-loop feedback coming from the O2 sensor. Turn off O2 feedback and see if that helps. Quote Link to comment Share on other sites More sharing options...
Tony D Posted March 15, 2012 Share Posted March 15, 2012 I agree with Leon. You can see this in any PID controller. Turn it to "manual"---in other words turn off ALL enrichments etc, O2 Feedback and see what happens. MS should, if you MAP is steady and you have steady load be rock steady on AFR. Enable ONE correction at a time individually and watch the effect on the tune. Likely it's set up and in Hysteresis meaning it's overcompensating for small swings that dont need compensation. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted March 15, 2012 Share Posted March 15, 2012 Yeah, assuming you have no misfires, it sounds like you have a untuned AFR table and O2 correction turned on. Quote Link to comment Share on other sites More sharing options...
98cobra+75280z Posted March 16, 2012 Author Share Posted March 16, 2012 Thanks for your guys help. It was the o2 correction that was throwing off the tuning process. Thanks again,Kevin Quote Link to comment Share on other sites More sharing options...
Leon Posted March 16, 2012 Share Posted March 16, 2012 Thanks for your guys help. It was the o2 correction that was throwing off the tuning process. Thanks again,Kevin I have a bingo! Quote Link to comment Share on other sites More sharing options...
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