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How do I keep AFR's steady while cruising?


98cobra+75280z

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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

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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.

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