Hey everybody. Not sure if this is the right forum, but here goes anyway... I put a twin scroll setup on my car and before the turbo swap I had the TD04 on the car with the O2 in the header. When I put the TS setup on, I moved the O2 to the DP, right after the turbo. Since the turbo swap, I have noticed that if I'm at less than 10% TPS and decelerating or cruising and around 2000-2500 rpms, my AFRs start to osscilate wildly until I either get on the gas a bit more or off it completely. Has anyone else ever experienced this? Is there a time delay that the ecu is expecting between the O2 feedback and the adjustment? Perhaps moving the O2 to the DP has screwed this up? Any help would be appreciated. Cheers, JC
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I believe there is a time delay as you have mentioned. The ECU makes a AFR correction and waits and if it hasn't seen the correction yet it makes it again on top of the last one. Then it gets a good whiff and sees that it over corrected and does it all over again.

I see this frequently on my RS because it needs a different fuel trim for idle than it does for cruise, so it runs lean when I get off the highway and it pops up to rich in a few seconds and hold there for alittle bit before dropping the fuel trim alittle bit. I think this may be because of the headers though.
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Good info. Do you know what the two axis are for this? I suspect the correction % is the dependent variable and the AFR error is the independent variable? Could there be another independent variable such as time... I'd love to be able to adjust either the correction % down or adjust the time delay up to get it stop soing this? I am poking around in ecuedit trying to find this table but am having no luck... JC
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You may want to post on Enginuity.org, there are some guys good with assembly there.
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