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    Stock ECU closed loop defeat?

    Hi, Thanks for the reply Do you think the lean burn is due to stuffed cat's? Would that give an engine light? I was thinking and suggested by the dyno guy that it was a factory computer thing in an effort to squeeze a bit more economy out of them Currently both rear o2 sensors are removed from...
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    intercooler

    Hi Tappet, Is it off a Commodore? I will assume so for now.... I am running 8psi on stock ECU runs great except for the economy mode that the ECU tries to hang onto for a bit and runs lean for a few seconds Actually running slightly richer mid and top with the M90 on than before, had a rising...
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    Stock ECU closed loop defeat?

    Running a 96 LS400 with a Bullet M90 on stock ECU. I would like to know if there is a simple way to defeat the closed loop in the ECU? At the moment it will stay in closed loop for about 5 seconds at wide open throttle, before it drops into closed loop AFR in closed loop is around 15.5 then...


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