Who is using the 987 MAF Holder / Tube?

[maytag]

So..... because the end of the month is approaching, and my IM test is due, I went ahead and swapped back in the MAF holder I built when I did the swap originally.

This is the 986 maf holder, grafted onto the 987 tube, so that I could swap between them easily.

Cross your fingers this gets rid of those lean condition codes I've been getting. If so, then I'll work to find a way to swap in a 996 flash on my dme. (Thanks woody, I'll get that VIN to ya)

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[Robert986]

When I see Maytags MAF-pics I remember a thought I had.. On the 987-MAF tube the mesh after the "air straightener" (the black plastic matrix) seems really tight, when I blow through it I get the feeling it really give some resistance to the airflow.

How bad would it be for the MAF to just remove the mesh all together? Actually I cannot really see the need for it since it´s placed after the air filter. Any thoughts?

[blue62]

The mesh smooths out airflow pulses across the MAF sensor. Makes the MAF sensor more accurate
Which makes fuel management by the DME smoother and more accurate.

[Robert986]

Originally Posted by blue62

The mesh smooths out airflow pulses across the MAF sensor. Makes the MAF sensor more accurate
Which makes fuel management by the DME smoother and more accurate.

Are you sure? As for now I´m not convinced, but open for any thoughts :-)

I have been thinking and reading.. and this is my guess right now:

1) The plastic black matrix serves as air-straightener, like a honeycomb-mesh.
2) The fine metal screen after the black matrix is a extra protection for debris that might have got past the air filter, protecting the MAF and engine.

Thus removing the metal screen would give less air flow resistance but less protection of MAF/Engine. I cannot see how the metal screen would smooth out air pulses, but what do I know?

I have seen others that replace the plastic and metal screen with a honeycomb with far less area, thus giving more flow. This should be a good thing in my book.

EDIT: @Maytag, please let me know if I´m destroying your original thread, that's not my intention.

[maytag]

Originally Posted by Robert986

EDIT: @Maytag, please let me know if I´m destroying your original thread, that's not my intention.

You go right-on ahead. This is all applicable discussion.
And no politics.

I love it. ;-)

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[Robert986]

Originally Posted by maytag

You go right-on ahead. This is all applicable discussion.
And no politics.

I love it. ;-)

Sent from my SM-G970U using Tapatalk

Brilliant! Cheers Sir!

[blue62]

Originally Posted by Robert986

Are you sure? As for now I´m not convinced, but open for any thoughts :-)

I have been thinking and reading.. and this is my guess right now:

1) The plastic black matrix serves as air-straightener, like a honeycomb-mesh.
2) The fine metal screen after the black matrix is a extra protection for debris that might have got past the air filter, protecting the MAF and engine.

Thus removing the metal screen would give less air flow resistance but less protection of MAF/Engine. I cannot see how the metal screen would smooth out air pulses, but what do I know?

I have seen others that replace the plastic and metal screen with a honeycomb with far less area, thus giving more flow. This should be a good thing in my book.

EDIT: @Maytag, please let me know if I´m destroying your original thread, that's not my intention.

If the mesh is just before the MAF sensor it is there for the purpose I stated. To smooth out air pulses.
I got the information from an article I read on MAF sensors. The article was by Bosch. They developed the first MAF sensors and also the first O2 sensors. So I tend to go with their information on those two sensors

[blue62]

Maytag I think you started this thread. I don't mean to Hijack it.
Robert986.
Go to Wikipedia. Type in Mass Flow Sensor. The article will explain how the various types of MAF sensors work and what they really measure. An indirect measurement of Mass flow. not volume.
Read down to the cold wire type of sensor it talks about the mesh screen and its function. Hope this helps.

[Robert986]

Originally Posted by blue62

Maytag I think you started this thread. I don't mean to Hijack it.
Robert986.
Go to Wikipedia. Type in Mass Flow Sensor. The article will explain how the various types of MAF sensors work and what they really measure. An indirect measurement of Mass flow. not volume.
Read down to the cold wire type of sensor it talks about the mesh screen and its function. Hope this helps.

I did, "The mesh on the MAF is used to smooth out airflow to ensure the sensors have the best chance of a steady reading." No mentioning of pulses, however smoothing out. To my logic this must refer to the black matrix doing the "air straightning".

My idea is thus to remove the metal mesh but keep the plastic matrix, or rather change the matrix to a honeycomb doing the same work but less restrictive.

[Robert986]

Originally Posted by blue62

If the mesh is just before the MAF sensor it is there for the purpose I stated. To smooth out air pulses.
I got the information from an article I read on MAF sensors. The article was by Bosch. They developed the first MAF sensors and also the first O2 sensors. So I tend to go with their information on those two sensors

I do appreciate your input, however I´m still not convinced. First of all, there are two parts, as I call them: the matrix and the mesh. So talking about "the mesh" without determining wich of the two doesn´t make it clearer.

If you talk about the black plastic matrix as "the mesh", then I kind of agree, this is there to smooth out, but not pulses, rather to straighten out a turbulent flow to make it more consistent for the actual sensor. I cannot see how the metal wire mesh would improve the smoothness after the air straigthener. If anything it might induce small vortexes by the vortex shedding effect.

I would love to be wrong, but I still believe that I´m correct. :-) Would you be able to find that Bosch-article maybe?