Pierburg LMM jetzt offiziell für den TDI | Posts 32+

Hi.

Quote:

Reached 1200 RPM, then pressed "start" at approximately 1800 RPM, and engaged the "stop" function above 3000 RPM.

Okay, that's fine. I'm just a little surprised by the slow increase in the values.

[Speculation on]
The replacement for the MB should be characterized by a different performance curve in the lower RPM range.
[Speculation off]

Best regards, Rainer.

Okay, relieved, so my measurements are actually .

'The slow increase is also surprising to me, but I don't have an explanation. I'll install the Pierburg tomorrow and then see what happens. If you're interested, you can take a look at the new values I logged regarding boost pressure, as mentioned in the other post.'

'Thank you.'

peter

As promised, I'll check the values using the Pierburg device and you can see for yourself.
For the sake of completeness, let's mention Bosch again.

syncro peter wrote:

As promised, I will check the values with the Pierburg and see what we find. For the sake of completeness, let's mention Bosch again.

Well, the fact that the Pieburg delivers a final value of 1300 and the Bosch around 920 (presumably under similar conditions?), suggests that the Pieburg is too sensitive (or are you running that much boost pressure?).

Possible consequences include excessive soot buildup at low engine speeds, problems with emissions testing (MOT), and an excessively high EGR rate.

@ulf

Same conditions, essentially identical.

Previously, I had a lot of soot, but now I actually have almost none at all.

agr rate...agr is too high because the agr doesn't close properly anymore.

Loading pressure too high, no. See another post; currently performing relatively poorly for reasons that are not yet defined.




Off-topic.

I would like to know why I have a negative score (-1) in my karma, and where the error lies.

Hello syncro peter,

Could you please provide the part numbers for your Bosch mass airflow sensor (MAF) and your Pierburg MAF?

Thank you very much in advance.

Looking at the data, the car with the Pierburg should pull out of its torque dip much better and the turbo boost should kick in earlier.

hello

The Pierburg part number is:

7.2268
4.0
8.0

I don't have any Bosch products here right now.

If I look at the logs (manifold absolute pressure), your assumption seems to be correct.

I'm only interested in understanding why the value remains consistently high at 1275, aside from the high sensitivity that ULF mentioned.

Are the values possibly higher, but the control unit cannot process them?

[Translating...]hallo

woltte euch mal auf dem laufenden halten.

habe letzte woche am donnerstag einen neuen pierburg lmm bekommen

(siehe auch https://community.dieselschrauber.org/en/viewtopic.php?t=9012&highlight= )

und bis jetzt keine probleme mit einem fehler. der maximalwert liegt weiterhin bei 1275, also der wert den das steuergerät maximal verarbeiten kann. wenn sich etwas verändert oder probleme auftreten werde ich es posten.

The Bosch mass airflow sensor should no longer cause any problems by now.

The failure of the mass airflow sensor is mostly caused by deposits of oil, fuel, and 'road grime' accumulating on the sensor.

Installing an open air filter amplifies this effect many times over.

By the way, the next generation of LLMs is already under development, and it's supposedly designed to never fail again.

Just a heads-up for those who are considering buying this.

The expert opinion regarding that part includes an exception:
It is said that:
In engines that have been modified for increased performance, compared to the standard production version...
to demonstrate compliance with regulations.

I once talked to someone about this at the manufacturer.
"What is meant by that."
Depending on the expert's opinion, a performance test or...
Emission test reports are required.