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08-09-2017, 04:07 PM | #1 |
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Disabling "AF #3 correction"
Does anyone have experience with disabling the fuel correction from the rear o2 sensor?
4-500 samples correction on stock header: http://datazap.me/u/tor/tor-119?log=...zoom=4191-4739 4-500 samples on Gruppe-S header catless: http://datazap.me/u/tor/tor-222-400k...zoom=7307-7716 Looks pretty erratic on the catless header. I tried to zero it out and before my ECU set -3 LTFT. After (with not so much learning) +1.2. Anyone know if there are any disadvantages? I don't know if this could be responsible for months of headache with unstabile LTFT? The rear sensor is pretty close to the collector. Could it be influenced by the other runners in some kind of reversion?
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08-09-2017, 04:27 PM | #2 |
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Another bit of log:
http://datazap.me/u/tor/tor-201-auto...mark=1292-1289 Just at a transition between CL and OL, with MAF V around 2.9 and MAF 60 g/s, AF #3 correction throws in 1.82% extra fuel and STFT corrects against it with -1.78. That can't be good?
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08-09-2017, 06:14 PM | #3 |
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A few guys on here have disavled rear 02 compensations due damaged 02 sensor , seems no noticable effects
Anyone with a rear 02 connected flex kit will also have those compensations disabled You will also need to disable a couple of cel codes as well as the three compensation tables set to zero Aparantly tjese conpensations only used during cruise fueling like on highway |
08-09-2017, 09:26 PM | #4 |
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Your fuel trims are fine. LTFT Within +/- 5 is ideal, within +/- 10 is acceptable, don't worry about STFT. Your total trim is great. But you need to tell us what your trims are at idle and at 2500 RPM
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08-10-2017, 10:05 AM | #5 | ||
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Quote:
"AF#3 learn" is also still active in my logs. I'm not sure what table that corresponds to in RomRaider, if any. These are small corrections between 0 and +0.34 and only during OL. I am wondering if it's "A/F #3 CL Target Compensation Limits", the description in RomRaider seems like gibberish to me, but the limits of that table are +0.5/-0.5. http://datazap.me/u/tor/tor-228-4-6?...zoom=9089-9437 Quote:
I am not worried about either my LTFT or STFT at all. What is bothering me is when my ECU one day set WOT LTFT of e.g. -1.2 and the next day e.g. +3.56. That causes a wildly unpredictable AFR that one day is too lean and the next day too rich. The point of this thread is to see if the swings are caused by the rear o2 sensor compensation being erratic for one reason or another (like header design, lack of cat or combination or a 4th unknown reason) and what the effect is when disabling those compensations.
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08-10-2017, 02:16 PM | #6 |
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Also, does anyone know if A/F #3 correction is possible to log with OFT and what it might be called?
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08-10-2017, 05:09 PM | #7 |
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