Topic: LMM at Hopa

Hello everyone,

Just found this while browsing:

http://messe.hopa-tec.de/site/pdf/lmm.pdf

While it doesn't introduce anything fundamentally new, here are three dynamometer curves related to faulty mass airflow sensors (MAF sensors) for a change.

It might be of interest to some people.

I find it amazing that a tuner would speak out so strongly AGAINST sports air filters .

CU Gremlin.

I find it amazing that a tuner would speak out SO strongly AGAINST sports air filters

CU Gremlin

They are absolutely right about that!
I have personally experienced in the development of internal combustion engines how significantly the air intake system, including the filter lines and mass airflow sensor (MAF), affects the air mass measurement and lambda control. In case of doubt, if the ducting is incorrectly routed, air will flow around the outside of the hot film element, and as a result, the engine management system will receive significantly less air mass.
Furthermore: With a turbocharged engine (especially a diesel), a performance air filter is almost pointless because the turbocharger almost compensates for the slightly higher pressure drop of a standard paper air filter.
I much prefer a verschandeln intake manifold (and therefore a longer engine life) to a few extra liters of air, which anyway can hardly be used for performance.
And the oil mist from such a filter can indeed quickly lead to premature failure of the mass airflow sensor.

By the way: I saw a customer service notice from VW regarding a goodwill replacement program for faulty mass airflow sensors (MAF sensors) on 1.9 TDI engines. It mentioned a 100% goodwill replacement, apparently up to 100,000 km and 2?? years, but only with regular maintenance inspections. Perhaps someone here knows more, otherwise I can inquire for more information about the goodwill arrangement if you're interested.


Regards,

Tractor driver.

Hello.

I have personally experienced in the development of internal combustion engines how significantly the air intake system, including the filter lines and mass airflow sensor (MAF), affects the air mass measurement and lambda control. In case of doubt, if the ducting is incorrectly bent, air will flow around the outside of the hot film element, and as a result, the engine management system will receive significantly less air mass.


If a Pierburg developer saw my AFN conversion, they would probably have a heart attack. Due to space constraints, the mass airflow sensor (MAF) is tightly wedged in place with a sharp bend before and a tight curve after. Furthermore, the air filter is far too small. Despite this, the measured value of 850 is close to the target value.
I was just about to start looking into getting a K&N air filter replacement to somewhat compensate for the small air filter. I think that would be a good idea, but I'll probably postpone it for now.
I do have concerns that excessive vacuum might draw oil mist into the intake manifold, but who knows what's actually better.

Well, that goodwill gesture doesn't really help me. It would be much better if they offered the old Pierburg part at a lower price...

Hello.
Wolfgang.
T3 Syncro 16 AFN