kaross
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« on: March 09, 2019, 07:11:49 AM »
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Hi!
I got big problems with AFR tuning one a little bit modified S3 1.8T. It runs really lean. Measured fuel pressure and it stays steady all the time. Car has hydrid turbocharger, downpipe, free flow exhaust, upgraded fuel pump and new Bosch 0280158117 (550cc) injectors.
I calculated KRKTE = 0.059. Fuel pressure is 3bar. Idle is good. Problems starts only when I am going WOT.
anybody can take a look at logs. If needed, I can post also tuning.
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littco
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« Reply #1 on: March 09, 2019, 07:58:23 AM »
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Did you change tvub as well for the 550cc injectors?
Also Lamfa, is that set still at stock? as if it is then it'll run lambda 1 until BTS is hit then dump fuel to cool
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« Last Edit: March 09, 2019, 07:59:55 AM by littco »
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Blazius
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« Reply #2 on: March 09, 2019, 08:19:00 AM »
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There is something hella wrong with ur tune/setup, your actual lambda is nowwhere near requested.. Also please dont do WOT runs with 23 AFR lol..
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kaross
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« Reply #3 on: March 09, 2019, 08:47:34 AM »
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I changed LAMFA. attached pic.
KFFDLBTS zeroed. KFLBTS slightly modified.
I am not doing WOT runs, I see that lambda is hell out of needed.
I tried to run stock TVUB and changed it also, but nothing much helps.
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kaross
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« Reply #4 on: March 09, 2019, 08:50:36 AM »
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Modified KFMLDMX. LDRXN, KFDLULS, NMAX. KFMIZUFIL, KFMIZUOF
KFLDIMX and KFLDRL because it is overshooting boost.
KFMIRL stock. KFMIOP just little bit raised max load column.
Nothing unusual.
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Blazius
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« Reply #5 on: March 09, 2019, 09:23:31 AM »
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Honestly I dont know wtf u did there are times when your afr is above 30 and stuff lmao.. This looks like a hardware issue to me , sadly the tuners aint online atm.
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« Last Edit: March 09, 2019, 09:25:51 AM by Blazius »
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BlackT
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« Reply #6 on: March 09, 2019, 09:51:49 AM »
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No way the lambda is so high. It is too lean to burn. Try to change O2 sensor
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kaross
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« Reply #7 on: March 09, 2019, 10:04:18 AM »
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Lambda is new. Also injectors genuine Bosch and new. it is lean for sure, because when try to accelerate car is shaking/shuddering. Fuel pressure is measured and all time steady (new Walbro fuel pump). MAybe someone can take a look and give opinion about software?
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« Last Edit: March 09, 2019, 10:06:13 AM by kaross »
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Blazius
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« Reply #8 on: March 09, 2019, 10:45:10 AM »
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Lambda is new. Also injectors genuine Bosch and new. it is lean for sure, because when try to accelerate car is shaking/shuddering. Fuel pressure is measured and all time steady (new Walbro fuel pump). MAybe someone can take a look and give opinion about software?
Then explain why are you getting AFR's near 23 , 30 and even 50.. Gasoline engines cant really run after 22AFR because there is no combustion event. You must be getting misfires or something is really wrong. |
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fknbrkn
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mk4 1.8T AUM
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« Reply #9 on: March 09, 2019, 02:24:14 PM »
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if fuel pressure are steady then fpr not connected to the vacuum line
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Aardschok
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« Reply #10 on: March 09, 2019, 02:37:32 PM »
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IDC peaks at 42.5%  |
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Blazius
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« Reply #11 on: March 09, 2019, 03:50:30 PM »
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IDC peaks at 42.5% This.. IDC is about 37% on 2nd log, with 9ms injector on time @ 110% load... you are simply not injecting enough fuel for the amount of air coming in..Your requested/actual load seems to be fucked too  |
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« Last Edit: March 09, 2019, 04:03:44 PM by Blazius »
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kaross
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« Reply #12 on: March 09, 2019, 04:06:45 PM »
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how did you calculated 37% IDC?
I am using formula: ti_b1 * nmot /1200 = IDC.
Can't find what I am screwed up.
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« Last Edit: March 10, 2019, 12:21:58 PM by kaross »
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nyet
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« Reply #13 on: March 09, 2019, 04:13:07 PM »
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There is so much going wrong here I don't even know where to start.
What is up with your boost req/actual?
What are your trims?
Why aren't you logging lambda control if you are having AFR issues?
Throw out your "tune" and go back to stock except for KRKTE, log again.
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« Last Edit: March 09, 2019, 04:15:10 PM by nyet »
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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kaross
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« Reply #14 on: March 09, 2019, 04:21:19 PM »
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by Lambda control you mean fr_w? or lambda PIDs (dlahi_w ;dlahp_w)?
Something is wrong with this turbo, because it is overboosting really much.
I tried with stock (only KRKTE), but turbo is so much overboosting that I can't do nothing and it really behaves similar. First of all I will try to find out where is problem with it.
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« Last Edit: March 09, 2019, 04:25:06 PM by kaross »
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