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golfputtputt
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« on: July 07, 2019, 08:35:06 PM »
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During closed loop AFR, I'm getting strange AFR behavior that I have been having a lot of issues solving. I've posted this same issue a while ago without coming to any solution.
I fixed some hardware issues and ran many checks on many parts and now I am back where I once was, still with closed loop AFR issues.
This data was recorded not under load with the car sitting in the garage after installing Fuel Injector Clinics flow matched 650cc injectors at 3 bar. I applied the data they provided me with to TVUB and calculated KRKTE and KVB. I have not yet touched KFKHFM or FKKVS yet (although I do have a properly scaled MAF). I have messed with those back when I had 550cc genesis injectors and they had no effect on my closed loop issues.
Anyone have any other suggestions? Messing with the idea of moving to a slot style MAF,I've heard they deliver pretty good, smooth, robust data.
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nyet
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« Reply #1 on: July 07, 2019, 09:24:43 PM »
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If you can't even get this running with a stock MAF, you're insane if you think an aftermarket MAF is going to make things easier.
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golfputtputt
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« Reply #2 on: July 08, 2019, 05:25:43 AM »
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Any ideas?
Look into hardware issues?
Air leaks?
Bad maf?
Bad O2?
Can a tiny pinhole weld leak result in unmetered air? Im unsure how sensitive these system sensors are.
Software issues?
MLHFM?
Study deeper into a specific portion of GGLSU?
Anyone ever deal with closed loop desired vs actual discrepancies?
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« Last Edit: July 08, 2019, 07:56:07 AM by golfputtputt »
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nyet
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« Reply #3 on: July 08, 2019, 08:51:12 AM »
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KRKTE or MAF scaling is wrong, or intake leak post maf
What are your trims
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golfputtputt
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« Reply #4 on: July 09, 2019, 12:36:28 PM »
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Hmm, this is new.
STFT’s and LTFT’s seem to be pinned at 0.0% after several days of driving in multiple conditions. I suppose that indicates a bad O2 and open loop conditions (open loop does not use O2 if im correct?)
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nyet
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« Reply #5 on: July 09, 2019, 12:38:09 PM »
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I'd expect at least a few DTCs if you are seeing trims pinned to 0% and a ton of lambda correction. Why not adjust KRKTE accordingly and see what happens?
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Blazius
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« Reply #6 on: July 09, 2019, 03:58:32 PM »
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Log the trims bits to see if they are being set to activate atleast while driving.
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golfputtputt
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« Reply #7 on: July 09, 2019, 04:37:26 PM »
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I used MasterJ's calculator then did it by hand, came out to the same value.
.05236789
656 was the average flow between the 4 using D2 fluid by Fuel Injector Clinic. Called them and they said D2 flows the same as gasoline, no need to scale based on N-Heptane.
TVUB is set to FIC's provided latency chart of:
2.03
1.39
1.04
0.80
0.64
of the correct corresponding voltage between my BIN and their chart.
*edit:
shit, left NOLRA=7 by accident. will correct and report
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« Last Edit: July 09, 2019, 05:21:12 PM by golfputtputt »
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golfputtputt
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« Reply #8 on: July 09, 2019, 04:59:20 PM »
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also, unsure of the bits but the log shows STFT's active.
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prj
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« Reply #9 on: July 10, 2019, 02:14:43 AM »
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ITT: People learning that injector specs given with injectors are usually useless. Welcome to tuning. Have a nice stay. Oh and ... every time I see anyone who describes some physical parameter about the engine as "smooth", I instantly know this person has no idea about anything. Prove me wrong  P.S. There is KFLF, KFKHFM, FKKVS. At least KFLF and FKKVS need to be zeroed. |
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« Last Edit: July 10, 2019, 02:16:46 AM by prj »
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Blazius
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« Reply #10 on: July 10, 2019, 03:53:08 AM »
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also, unsure of the bits but the log shows STFT's active.
No it doesnt. It stays at 1, that is the actual trim value. Log B_frau, b_frao , b_lra. |
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« Last Edit: July 10, 2019, 09:38:44 AM by Blazius »
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prj
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« Reply #11 on: July 10, 2019, 06:37:31 AM »
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No it doesnt. It stays at 1, that is the actual trim value. Log B_frau, b_frao , b_lra.
Maybe you need to look closer, because fr_w is changing, meaning STFT is active. |
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golfputtputt
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« Reply #12 on: July 10, 2019, 06:41:39 AM »
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KFLF, KFKHFM and FKKVS are all 1.
Trims with my prior posted values were -1.3% and -9.4% after a 20 minute drive.
New values are:
KRKTE: .05727600
TVUB:
2.003
1.371
1.027
.789
.632
Trims after: -1.9% -16.4%
Lambda (partial) self-adaptation (-16.4%) kept climbing after a 40 min drive, most often jumping up in value after closing/opening of the throttle.
Either air leak or interuption of MAF (turbulence) from DV?
Also, i feel like i went the wrong way with trim scaling...
No codes stored.
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« Last Edit: July 10, 2019, 06:49:07 AM by golfputtputt »
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nyet
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« Reply #13 on: July 10, 2019, 08:40:47 AM »
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yes negative means rich, not lean.
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Blazius
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« Reply #14 on: July 10, 2019, 09:38:19 AM »
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Maybe you need to look closer, because fr_w is changing, meaning STFT is active.
I didnt see, my bad. |
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