Who is using the 987 MAF Holder / Tube?

[1thenaton1]

you can't increase the diameter of the maf housing without adjusting fueling tables. MAF calculates the volume of air ingested using the velocity of the air past the sensor, which of course is a function of the size of the tube it's flowing through. The codes you are getting are generated in regular driving where the O2 sensors read lean/rich. At wide open throttle where the ECU is running on set tables (and not off of O2 sensor feedback), you will be running lean (increased airflow not accounted for because of incorrect maf housing size). Lean is mean, until it's not. Without monitoring this with a wideband O2 and updating to a custom tune you are asking for trouble, especially on track. What is you crazy

[maytag]

Originally Posted by 1thenaton1

you can't increase the diameter of the maf housing without adjusting fueling tables. MAF calculates the volume of air ingested using the velocity of the air past the sensor, which of course is a function of the size of the tube it's flowing through. The codes you are getting are generated in regular driving where the O2 sensors read lean/rich. At wide open throttle where the ECU is running on set tables (and not off of O2 sensor feedback), you will be running lean (increased airflow not accounted for because of incorrect maf housing size). Lean is mean, until it's not. Without monitoring this with a wideband O2 and updating to a custom tune you are asking for trouble, especially on track. What is you crazy

All makes perfect sense. I wasnt aware that at full throttle it was a closed-loop, either. Good stuff.

So, do YOU know anyone local who'd flash me to a 996 ROW?

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[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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[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