Pierburg LMM jetzt offiziell für den TDI | Posts 32+

Hi.

Quote:

1200 RPM reached, then the start button was pressed around 1800 RPM, and the stop button was pressed when it exceeded 3000 RPM.

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

[Speculation on]
The replacement for 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 also surprises 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 also take a look at the new values I've 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 and be amazed.
For the sake of completeness, let's mention Bosch again.

syncro peter wrote:

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

Well, the fact that the Pierburg delivers a final value of 1300, while the Bosch delivers approximately 920 (presumably under the same conditions?), suggests that the Pierburg is too sensitive (or are you running that much boost pressure?).

Possible consequences: Increased soot production at low engine speeds, problems with emissions testing, and an excessively high EGR (Exhaust Gas Recirculation) rate.

@ulf

Same conditions, essentially identical.

'Before, I had a lot of soot, but now I actually have almost none.'

agr rate...agr is too high because agr is no longer closing properly.

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




Off-topic.

I want to know what caused my karma score to be -1, and where is the error?

Hello syncro peter,

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

Thank you very much.

Looking at the data, the car with the Pierburg should pull out of the low RPM range 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?

hello

I just wanted to keep you updated.

I received a new Pierburg mass airflow sensor last Thursday.

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

'So far, I haven't experienced any errors. The maximum value remains at 1275, which is the maximum value the control unit can process. I will post an update if anything changes or if any problems arise.'

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

The failure of the LMM (likely referring to a Mass Air Flow sensor) is mostly caused by deposits of oil, fuel, and 'road grime' accumulating on the sensor!

Installing an open air filter significantly amplifies this effect.

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

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

The expert opinion regarding that part includes an exception:
It is said:
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 at the manufacturer about this.
"What is meant by that."
Depending on the expert, a performance test or...
Emission test reports are required.