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I'm curious if it is useful to tweak how the fuel system responds to the narrowband O2 sensors once long tube headers are installed. In particular, under Engine/Oxygen Sensors, would it be worth dialing in the Proportional Airflow Mode (ECM 12480), Proportional Gain v O2 Error (12481), Proportional Limit (12486), and the Integral Delay v Airflow Mode (12470) and Integral Delay v RPM (12472).
I'm wondering if the altered exhaust flow and relocation of the pre-cat O2 sensors has any effect on the ECM's interpretation of STFTs. Would altering the above values affect the accuracy of the STFTs, especially if using STFT to dial in part/cruise throttle MAF and VVE tables?
Unfortunately, I don't have logs of the car before long tubes were installed, so I don't have an idea of what proper O2 responses/swings look like, especially at lower airflow modes. Also, what would be a good indicator that the above values are close to what is needed based on the relocated O2 sensors?
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o2_tables.png
