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Thread: C7 Long Tube Question

  1. #1
    Tuner in Training
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    Sep 2022
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    C7 Long Tube Question

    Are changes necessary for O2 sensors when installing ARH 1 7/8" w\Cats?

    STFT is all within +/- 5% with headers installed and O2 setting left stock. Does leaving the Stock O2 settings affect fueling?


  2. #2
    Senior Tuner
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    Nov 2006
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    Not necessarily, But there are some adjustments to make to stop the fuel trims from swinging too far which happens in long tubes since the o2 sensors are cooler and further away.

    This shows up in low speed small surging.
    Tuner at PCMofnc.com
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  3. #3
    Tuner in Training
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    Changes like this?

    Engine>Fuel>Oxygen Sensors>Integral Delay>Airflow Mode - bump up 20% for O2 sensors moving downstream a little

    Engine>Fuel>Oxygen Sensors>Proportional>Airflow Mode reduce 10%
    Engine>Fuel>Oxygen Sensors>Proportional>Limit change to 1.25

  4. #4
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    More to it than that on a gen5. You also have to kill long terms 99% of the time. I posted what to change in this thread - Well, it's changed in the tune I posted - several temp corrections need to be made for really cold engine operation too otherwise you can wind up chasing your tail with REALLY COLD temp surges (10f and less).

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    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

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