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Author Topic: Desired boost/load oscillation after ~4300rpm  (Read 16680 times)
amd is the best
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« on: June 05, 2017, 07:00:58 PM »

Can someone give me a hint at what might be going on with this log? Let me know if I need to log any other variables too.

This is a mostly stock 4B0906018CH file. The car has a full tank of E85 and I have adjusted KRKTE to compensate for the ethanol fuel. Trims look perfect. I added a bit of timing, leaned out the fueling a bit with BTS and lowered the threshold to 400c. I disabled the IAT based timing retard table. Other than that I did the normal SAI, Cat, VVT and evap deletes.

Car is a 2000 ATW that has been converted to wideband using an 2001 A4 ECU FWIW. Bone stock car otherwise.
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2012 Golf TDI
2001 Audi A4 2.8 30v Supercharged
1991 Audi 200 20v
amd is the best
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« Reply #1 on: June 05, 2017, 07:01:49 PM »

Screenshot
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2012 Golf TDI
2001 Audi A4 2.8 30v Supercharged
1991 Audi 200 20v
corradovolksb
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« Reply #2 on: June 05, 2017, 08:47:59 PM »

Man that is crazy looking. I'm not at my computer to check the log but I'll try and take a look when I can.  Is VVT for sure fully deleted it seems like the oscillation starts right when vvt change over is.  Did you remove it in eskonf
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« Reply #3 on: June 05, 2017, 08:59:30 PM »

uh. Why is your actual boost so low? Massive persistent underboost is likely causing the ECU to do crazy things.
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« Reply #4 on: June 05, 2017, 09:07:44 PM »

Man that is crazy looking. I'm not at my computer to check the log but I'll try and take a look when I can.  Is VVT for sure fully deleted it seems like the oscillation starts right when vvt change over is.  Did you remove it in eskonf

VVT was removed in ESKONF and CDNWS = 0.

uh. Why is your actual boost so low? Massive persistent underboost is likely causing the ECU to do crazy things.

This is all stock. No change in request of any kind. Unless I've got some kind of boost leak...
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1991 Audi 200 20v
phila_dot
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« Reply #5 on: June 06, 2017, 09:31:00 AM »

Fast and slow path torque intervention. Milsol will show the same oscillation
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« Reply #6 on: June 06, 2017, 09:56:31 AM »

Fast and slow path torque intervention. Milsol will show the same oscillation

Even on a stock file (basically)? What could cause this considering it's all stock load?

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1991 Audi 200 20v
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« Reply #7 on: June 06, 2017, 01:12:32 PM »

To go back on what corradovolksb had mentioned about VVT not being fully disabled I have it removed in ESKONF and codeworded off however I came across an older thread about flattening out KFNWSE (setting all fields to 18). Of course my definition did not have these maps defined so I did my best to define them based on another file that seemed close. I'll report back on how this reacts.
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2012 Golf TDI
2001 Audi A4 2.8 30v Supercharged
1991 Audi 200 20v
nyet
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« Reply #8 on: June 06, 2017, 01:13:54 PM »

Any plans to address the insanely huge positive boost deviation?
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TijnCU
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« Reply #9 on: June 06, 2017, 01:57:55 PM »

I dont see much boost deviation, but I do see a huge maf reading for a bone stock ATW 1.8t  Shocked 200g/s at 5psi, give me that turbo!
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amd is the best
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« Reply #10 on: June 06, 2017, 01:59:14 PM »

Any plans to address the insanely huge positive boost deviation?

Less than 100 mbar deviation... Like I said, this is a stock car, stock file aside from KRKTE and emissions deletes.
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1991 Audi 200 20v
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« Reply #11 on: June 06, 2017, 02:00:11 PM »

I dont see much boost deviation, but I do see a huge maf reading for a bone stock ATW 1.8t  Shocked 200g/s at 5psi, give me that turbo!

I see plenty of both Smiley

At 0.6 bar of boost 100 mbar is gigantic.
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ME7.1 tuning guide
ECUx Plot
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Trim heatmap tool

Please 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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flying brick


« Reply #12 on: June 06, 2017, 02:01:37 PM »

This engine maxes out at around 150g/s when tuned. So obviously something is very wrong with the MAF (or scaling).
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amd is the best
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« Reply #13 on: June 06, 2017, 02:02:40 PM »

I dont see much boost deviation, but I do see a huge maf reading for a bone stock ATW 1.8t  Shocked 200g/s at 5psi, give me that turbo!

I'm using an AWM ECU on an ATW. Are the MAF's different? I am a bit new to 1.8t... I can compare the MLHFM when I get home too of course.

What else would cause such a huge MAF reading? Another sign at a boost leak? Bad MAF but no CEL?

Thank you all!
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2001 Audi A4 2.8 30v Supercharged
1991 Audi 200 20v
TijnCU
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« Reply #14 on: June 06, 2017, 02:04:42 PM »

You need to use the original MLHFM (and KFKHFM if filter is stock) for the engine. The turbo is not able to produce this amount of airflow, so can not be caused by any leaks.
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