2.5 TDI BDG Ladedrucküberschwinger | Posts 16+

I just visited the mechanic. However, they said that the control unit cannot be updated and that I would need to replace it. Does this mean that some people who updated their tuner are now running a firmware version that isn't entirely compatible with their hardware?

I have since replaced the N75, but it hasn't made any difference.

The hardware is, at least visually, the same. If you know the specific details about why it needs to be replaced, please share them. Otherwise, this engine control unit is a simple EDC15VM, as Rainer says, and it can be easily 're-flashed' .

I can confirm that.
Audi wanted around 800 euros for the more recent engine control unit with software version 0060.
I then asked in a chip tuning forum who could flash that part for me.
It was done for nothing, since it was based on an original data set.

Sure, here's the translation:

"LG" translates to "Best regards" or "Sincerely" in English.

What changes did the software update bring for you?

I've been trying to get quotes for replacing the turbocharger. One quote was cheap, but they strongly recommended replacing the mass airflow sensor (MAF) first. I then logged the mass airflow again and found that, above 3000 RPM, the target mass airflow is not being reached, even with the correct boost pressure (approximately 810 mg/stroke instead of 880 mg/stroke at 4000 RPM). I then replaced the MAF sensor with the same result. Then (unfortunately, only then...) I checked the smoke limit. There are no issues there. There's enough air, so the boost pressure drop-off isn't having an effect. After that, I searched for other BDG logs here and found (/viewtopic.php?t=24023 and /viewtopic.php?t=18346). They all have insufficient air mass above 3000 RPM (except after tuning). It seems to be normal!

I was also advised to try lubricating the VTG shaft with a special grease from Audi, specifically designed for engines with electric VTG, before having the turbocharger replaced. This might help resolve the issue. What do you think about it?

Hello,

As long as the smoke limit in measurement block 8 does not fall below the torque limit imposed by the transmission, everything is okay.

Best regards, Rainer.

Hello.

I also logged some instances of overboost a while ago using VCDS.
Table created.



Matthias.

/viewtopic.php?t=25563

It seems there was a problem with the attachment...

Hello.

Attachment re-attached, hopefully it will work this time.

Okay, the new turbo is installed: It still has a slight overboost with a very slight underboost, but the overall behavior looks "more normal." The full fuel injection is now being released at a little over 1700 RPM. From the lower part of the structure, you can no longer see anything of the smoke containment system.
While driving, the new turbocharger is particularly noticeable in its responsiveness, especially in city traffic. Now, even in second gear, you experience the steep torque increase in the lower RPM range when you press the accelerator, just like I'm used to from other TDIs (2.0 TDI). So far, the intermittent engine cut-outs that occurred during overtaking maneuvers on the highway have not happened again.