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News: AEM SERIES 2 EMS PLUG-N-PLAY FOR MKIV SUPRAS!
 
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Author Topic: Set up Closed Loop O2 Feedback  (Read 32834 times)
JeffTsai
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Posts: 1
« Reply #45 on: August 31, 2008, 11:16:26 PM »
I'm having an issue with mine right now. The O2 feedback works perfect during idle and is fine if I let off the gas while cruising...so basically whenever throttle is at 0%. It's the weirdest damn thing because whenever I start to accelerate, all the numbers on the O2 feedback parameters just freeze at the last known value. It doesn't matter if I romp on the gas and go into boost or accelerate slowly and normally while staying in vac. Is there a MAX TPS setting somewhere in this software I'm missing? Or could something in the accel/decel fuel be affecting O2 feedback?

I'm hoping to get this fixed because it's really tickin me off right now lol. I've been screwing with the damn settings for the past few months and I still can't solve it. I just left it on because it's still nice to have feedback while idling, but I would like to have it for those long highway trips to save on gas.

Thanks in advance for the help!
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05plsrt4
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Posts: 40
« Reply #46 on: September 09, 2008, 08:49:07 AM »
Can someone explain this a little clearer?

This is from the manual for tuning proportional gain "When tuning the O2 feedback and overshoot occurs, lower this number. If undershooting the AFR target, raise this number."

Does "overshoot" mean it drives richer than it should.....or leaner than it should? Or does it mean that it drives richer or leaner by a high margin?
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Kristopher
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Posts: 117
« Reply #47 on: September 09, 2008, 10:58:35 AM »
Quote from: JeffTsai on August 31, 2008, 11:16:26 PM
I'm having an issue with mine right now. The O2 feedback works perfect during idle and is fine if I let off the gas while cruising...so basically whenever throttle is at 0%. It's the weirdest damn thing because whenever I start to accelerate, all the numbers on the O2 feedback parameters just freeze at the last known value. It doesn't matter if I romp on the gas and go into boost or accelerate slowly and normally while staying in vac. Is there a MAX TPS setting somewhere in this software I'm missing? Or could something in the accel/decel fuel be affecting O2 feedback?

I'm hoping to get this fixed because it's really tickin me off right now lol. I've been screwing with the damn settings for the past few months and I still can't solve it. I just left it on because it's still nice to have feedback while idling, but I would like to have it for those long highway trips to save on gas.

Thanks in advance for the help!

I'd check my TPS to ensure it's not reporting flakey values, then check the O2 FB Rich/Lean limit %. Otherwise I was also looking for a TPS% parameter and had no success (I get a very rapid fall/stall in RPM coming to a stop as I clutch before the idle feedback takes effect).
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Kristopher Rozon
1991 Talon AWD 2.3 272 FP3065 FMIC 1000cc WI AEM EMS 420awhp
1999 Jetta TDI weaksauce
TaraFirma
EMS Poster Child
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Posts: 10
« Reply #48 on: April 14, 2009, 07:07:32 AM »
I set up O2 feedback and have an issue where after cruising at highway speeds for a while my AF will read exactly what i put in the o2 value. 14.7 after stopping and starting again though, it will jump all over the place from low 11's to low 15's, then, just like someone flips a switch, it will jump to 14.7 and stay there the whole time. Until i come to a stop and start cruising again.
Any Help?
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Kristopher
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« Reply #49 on: April 14, 2009, 06:29:39 PM »
Intake Air Temp heatsoak?
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Kristopher Rozon
1991 Talon AWD 2.3 272 FP3065 FMIC 1000cc WI AEM EMS 420awhp
1999 Jetta TDI weaksauce
TaraFirma
EMS Poster Child
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Posts: 10
« Reply #50 on: April 21, 2009, 02:30:35 PM »
Don't think so. i went ahead and unchecked O2 feedback to turn it off to see if it made ANY difference. It didn't about 10 minutes into my drive to work my AF moves to 14.6 and stays there no matter what I do until i get into boost. Then it jumps around again for a few minutes then goes back to 14.6.
 I'm stumped. If it does it with O2 feedback on and off its obviosly not the O2 feedback doing it. So I'm wondering what makes my AF jump around erratically, then magicly sweep over to and stick right on 14.6
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talontsi37
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Posts: 76
« Reply #51 on: June 09, 2009, 11:43:27 AM »
Quote from: TaraFirma on April 21, 2009, 02:30:35 PM
Don't think so. i went ahead and unchecked O2 feedback to turn it off to see if it made ANY difference. It didn't about 10 minutes into my drive to work my AF moves to 14.6 and stays there no matter what I do until i get into boost. Then it jumps around again for a few minutes then goes back to 14.6.
 I'm stumped. If it does it with O2 feedback on and off its obviosly not the O2 feedback doing it. So I'm wondering what makes my AF jump around erratically, then magicly sweep over to and stick right on 14.6

Sounds like your 02 sensor is bad. Mine recently took a crap and would just stay at 14.2 buy a new one they are only $70.
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jonbar87
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Posts: 126
« Reply #52 on: September 01, 2009, 06:01:14 PM »
Quote from: shaundrake on July 27, 2008, 08:28:04 AM
"O2 FB Rate
Units: mS
Description: O2 feedback base timer for both proportional and integral terms. This is how often the air fuel ratio is looked at to determine the correction.
Typical Use: A smaller number gives a faster response by effectively increasing the gain. This should be the same as the sampling rate of the O2 sensor being used. A typical value is 65.59 mS."

What's the sampling rate of AEM's Gauge Type UEGO?
I'm wondering this as well. (I have the 30-4100 gauge)
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