Boost Control: ACV Adjustment with SMD

Hello!

I just read through the articles because I want to increase the turbocharger boost pressure by about 0.1 bar on my 2.5 TDI ACV engine. Now, the question is: Is this possible with this control unit, on an engine without a variable geometry turbocharger (VTG)? This is a T4 model from 2001. Has anyone done this before? Are there any experiences or data available about it?

Greetings to you from Peter.

Hello Peter,
What type of engine control unit (ECU) is installed in your Audi A2 (ACV)? Is it an MSA15 or a later EDC15?
For the MSA15 (part number ending in 021x), the turbocharger pressure sensor is still located within the control unit.
and you can take the instructions, which should be available somewhere here.
With the newer models that use an external sensor, you could try adding a parallel resistor.
Attempt to access the STG input.

Best regards, Rudi.

"Thank you, I'll get started on the control unit right away." (Afternoon)

Regards, Peter.

Hello Peter,
Since you're already getting a diagnosis, would you like to...?
Let's see where your air mass goes (under load).
The dosage should be around 1250mg.

Thank you.

Rudi.

Thank you, but I can't promise whether I'll be able to do it today. However, I will definitely post everything later, thank you.

Regards, Peter.

Hello!

Having studied the wiring diagrams of my T4 (although I haven't yet been able to do a test run due to time constraints), I have come to the following conclusion. The combined temperature and pressure sensor for the intake manifold has four connections. The pressure sensor (labeled G71) has two connections that go to the control unit: red/green to terminal T121/31, and blue/black to terminal T121/71. Which of these is the input you described?

Hi Peter,

Hi everyone!

Today, I finally conducted a measurement run. The ECU number is: 074 906 018C. I don't know which specific ECU this is, nor whether it's possible to increase the boost pressure on this unit in the way we're discussing. Please help me with this.

I'm having trouble understanding the values displayed by the LMM (likely referring to a mass airflow meter or similar). In measurement block 003, two different LMM values are shown, which is confusing. What surprises me are the fluctuations. For example, the value at 2200 RPM is 580mg/Re, and immediately after that, at 2300 RPM, it's 350mg/Re. How is that possible? The specified target value of 1250 under load is never reached. Perhaps I can send someone the Excel spreadsheet. I'm just not quite understanding all of this. The boost pressure was 959 mbar of air pressure at 100% load, with a maximum of 2020 mbar, which means a maximum boost pressure of 1.06 bar. Is that correct? Isn't that a bit too low?


Regards, Peter.

Hello Peter,

The engine control unit (ECU) is an EDC15. The turbocharger pressure sensor is located externally.
Dein Ladedruck ist eher zu hoch als zu niedrig. The chart shows...
Ideally, the text should be no more than 1845 characters long, but it's possible that adjustments might be needed after proofreading.
'you might get more out of it (you should check out the group sometime).'
'View 011 - Field 2: Should be; Field 3: Is; referring to my documentation for the ACV.'
Indicates 1950 as the maximum value... relative to sea level .
Air mass: Field 2 (Target), Field 3 (Actual). Depending on the condition of the EGR valve, ...
You have either more or fewer (usually more) significant deviations.
The ACV (presumably referring to a specific device or system) that I am responsible for is not exceeding a value of 850 mg.
(but still runs at 190 ).
Why don't you post your logs sometime?

Best regards, Rudi.

Measurement block 10.

LMM Air / Rev. - Absolute Pressure - Absolute Pressure - Load.



mg/R mbar mbar %
420 959 969 0
425 959 969 0
420 959 969 0
420 959 969 0
420 959 969 0
425 959 979 0
430 959 969 0
535 959 1193 63.1
710 959 1795 59.6
735 959 1703 86.7
575 959 1591 0
755 959 1907 93.7
525 959 1428 0
460 959 1142 0
455 959 1102 0
445 959 1081 0
440 959 1051 0
460 959 1030 0
400 959 989 8.6
455 959 1040 19.6
520 959 1153 91.4
775 959 1877 2.4
480 959 1173 22.7
445 959 1071 0
460 959 1102 11.4
445 959 1051 7.5
450 959 1051 16.9
510 959 1132 68.2
630 959 1448 58.8
535 959 1255 36.5
510 959 1244 27.5
505 959 1204 27.8
565 959 1265 74.5
535 959 1438 0
470 959 1112 23.9
460 959 1091 22.4
440 959 1040 7.8
450 959 1061 22.4
510 959 1183 34.5
460 959 1132 10.2
440 959 1040 0
445 959 1020 14.5
455 959 1061 18
445 959 1030 14.9
480 959 1091 36.1
455 959 1071 18.8
450 959 1051 26.3
480 959 1091 38
505 959 1173 36.1
465 959 1102 22.7
465 959 1091 22.7
455 959 1061 20
455 959 1061 23.5
485 959 1102 42.4
530 959 1244 34.5
480 959 1142 13.7
450 959 1051 16.1
465 959 1071 32.2
490 959 1153 30.6
480 959 1122 24.3
465 959 1081 2.4
440 959 1030 0
450 959 1040 18
450 959 1051 14.5
455 959 1040 21.2
465 959 1071 30.2
520 959 1214 33.3
470 959 1112 12.5
450 959 1040 11
470 959 1061 32.5
485 959 1132 29
490 959 1142 28.6
490 959 1142 32.5
495 959 1214 25.1
475 959 1132 18
455 959 1081 9.8
455 959 1051 12.5
465 959 1071 26.3
470 959 1091 20.8
460 959 1071 14.5
460 959 1051 21.6
515 959 1153 47.1
470 959 1132 18
455 959 1071 10.6
490 959 1112 34.5
485 959 1153 25.9
455 959 1091 5.9
445 959 1040 2.7
440 959 1020 12.5
455 959 1040 18
445 959 1040 10.2
440 959 1030 12.2
450 959 1051 19.6
450 959 1040 14.1
445 959 1020 6.3
440 959 1020 16.9
495 959 1102 60.8
550 959 1275 74.5
525 959 1295 21.2
455 959 1081 0
445 959 1040 0
440 959 1020 0
480 959 1091 100
540 959 1244 100
590 959 1377 100
675 959 1581 100
760 959 1948 63.9
545 959 1377 28.2
470 959 1153 6.3
510 959 1163 44.7
820 959 1867 96.1
760 959 1907 91
495 959 1244 0
475 959 1163 0
460 959 1122 51
810 959 1897 1.6
480 959 1193 0
455 959 1102 0
420 959 1030 0
425 959 1000 0
445 959 1040 0
440 959 1030 29
545 959 1244 100
645 959 1510 100
800 959 1989 100
750 959 1887 100
555 959 1469 3.9
460 959 1142 0
450 959 1091 0.4
510 959 1142 47.5
510 959 1234 27.8
470 959 1153 14.1
475 959 1122 23.5
520 959 1234 33.7
535 959 1265 40.8
520 959 1285 24.3
520 959 1255 25.9
640 959 1469 56.9
545 959 1438 22
480 959 1173 12.9
475 959 1142 23.9
625 959 1387 83.9
555 959 1561, 14.5
470 959 1153 0
455 959 1102 0
415 959 1040 0
405 959 989 0
450 959 1061 0
455 959 1081 0
445 959 1051 0
430 959 1010 0
435 959 1010 0
465 959 1061 100
535 959 1224 100
635 959 1479 100
815 959 2020 100
530 959 1346 30.2
475 959 1163 14.1
465 959 1102 14.1
460 959 1102 8.2
450 959 1061 5.9
460 959 1081 16.1
455 959 1081 15.3
490 959 1122 31.4
520 959 1244 34.9
525 959 1265 32.2
505 959 1224 26.3
495 959 1183 23.9
480 959 1163 23.9
480 959 1153 20
475 959 1132 17.3
535 959 1224 38.8
535 959 1275 32.9
500 959 1214 15.7
460 959 1102 0
475 959 1071 0
420 959 1010 0
420 959 989 0
415 959 989 0
415 959 979 0
425 959 979 0


Target values according to the table:
Air mass in mg/H: 800...950
Intake manifold pressure: 1700...1950

The AGR (Abgasrückführung) is currently not functioning properly . The question now is whether the logged value** at 100% load with 2020 mbar is an overshoot or a constant value. Unfortunately, I haven't been able to do any sustained full-load runs because we are being monitored quite strictly at the moment . Perhaps I could reduce the injection amount slightly; then it shouldn't soot as much at full load (it's minimal, but it bothers me).

Thank you for the response.

Regards, Peter.

Hello Peter,
The boost pressure values are overshooting.
You can usually tell when something is in a steady state by observing...
A longer measurement run will then allow us to determine the boost pressure.
represents the speed (see image).
The air mass values might originate from 'my' ACV (Automatic Weather Station).
Sure, here's the translation:

'Also, nothing above 850.'

Best regards, Rudi.

Hello Rudi!

What conclusions should I draw from all of this? Is everything okay??? Even though the target values are not being reached??? How does it work with the EDC15 system? Is it possible to increase boost pressure by installing a resistor on the sensor? Has anyone had experience with that?
@ Rudi

Have you ever adjusted the fuel injection volume? How do the values need to be changed to achieve an increase or decrease in the amount of fuel injected?

Thank you for the information.

Peter.

Hello Peter,

What conclusions should I draw from all of this? Is everything okay??? Even though the target values are not being reached???

Good question. What surprises me is that with your ACV (Air Conditioning Valve), the air mass also remains below the target value.
Perhaps there are other ACV drivers here who might want to check this out.

'How does this work with the EDC15 system? Is it possible to increase boost pressure by installing a resistor on the sensor?'

Should.

> Has anyone had experience with this?

Unfortunately, I can't.

Have you ever adjusted the fuel injection amount?



How do the values need to be changed to achieve an increase or decrease in quantity?

You go to the corresponding fields and adjust the values.
Correct the checksums and upload the new dataset to the control unit.
If you're already accessing the software, you can adjust the boost pressure there as well.
with change.

Best regards, Rudi.

Hello Rudi!

I knew that it was possible to adjust the fuel injection volume slightly, but the boost pressure? Unfortunately, I'm a novice in this area and don't want to experiment too much; I prefer to make definitive changes. Can you tell me which channels correspond to these two values? I'm sure I've seen this information somewhere before, maybe even printed it out, but I have no idea where I put it now (due to renovations and the resulting chaos).

The login was probably 11463 or something? Unfortunately, the values in the channels usually don't have a direct correlation to the desired actual values. What I've seen is that with some changes, increasing the value results in a decrease, while with other changes, the same measure results in an increase. That's why I'm a bit unsure about it. Could you please help me out? After all, I'm always learning .

Regards, Peter.

Hello Peter,
I think we might have misunderstood each other a little bit .
I didn't mean the adaptation channels, but rather modifying the characteristic maps.
in the chip (short for 'chip tuning').

Best regards, Rudi.

Hello Rudi!

Well, that's where my expertise ends. I know that my engine control unit (ECU) is flashable, that's for sure. A new software version has already been installed in the ECU. Since then, there has also been visible soot in the full load range. I assume that the fuel injection amount and ignition timing have been changed. If I could find someone to install a proper software on it, I would probably be able to avoid all these problems . Now, I'm going to install a boost pressure gauge and then connect a potentiometer to the boost pressure sensor, trying to slightly increase the boost pressure until the soot disappears. However, I want to increase the pressure by a maximum of 0.2 bar; I don't want to have to buy a new turbocharger.

I'm also considering buying a control unit on eBay that I can use as a backup in case the other one doesn't work properly. I think it's quite possible that they installed the wrong software for me at Vau Weh back then; could that be the problem?

Regards, Peter.

Hello Peter,
You wrote that your engine control unit (ECU) is a 074 906 018C. Was this read out using VAG-COM?
'074 906 018C would be suitable for an ACV. It would also be interesting to know the software version.'
If possible, could you please post the entire 'startup message'?

Best regards, Rudi.