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?
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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?
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.
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
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).
https://forum.hptuners.com/showthrea...during-driving