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986 Forum - The Community for Porsche Boxster & Cayman Owners (http://986forum.com/forums/)
-   Performance and Technical Chat (http://986forum.com/forums/performance-technical-chat/)
-   -   Who is using the 987 MAF Holder / Tube? (http://986forum.com/forums/performance-technical-chat/77400-who-using-987-maf-holder-tube.html)

Starter986 03-22-2020 05:21 AM
Quote:
Originally Posted by maytag (Post 613782)
Oh for hell's sake byp, doesn't matter HOW reasonable somebody is with you, you're going to continue to be the ass-hole cry baby, aren't ya? For Pete's sake man, grow up.
You're such a douchebag.

I've been hands off with you because you're so easily triggered, but when you volunteered into my thread, I thought "huh.... ok! Maybe he's finally letting it go!" So I simply responded to you as if you'd never been the dick-head you've been.

But it seems you just can't help yourself, can ya? Most people are a dick sometimes, some people are a dick most of the time. But you? It seems you're one of the rare breed who's a dick all the time.

I'm not going to descend to a place where i'd engage the actual content of your comment, because I refuse to legitimize it.

I'd appreciate it if we could go back to just ignoring each other?
OK May... this is where I have to step in and offer up to you some advice.

If you're going to refer to people by name, at least demonstrate some respect.

Dick is spelled with a capital D.

Robert986 03-22-2020 07:50 AM
Quote:
Originally Posted by jaykay (Post 613740)
Robert,

Perhaps slightly better performance and the proper match for the 987 MAF diameter; folks here are actively using it. Full disclosure: I have just changed from a third party tune to the stock 986S and planned to go to the 996 ROW. I am not sure about the anniversary tune and don't know anyone using it. I believe the anniversary is geared to the 68mm TB where as the 996 is geared to the 74mm.

You will: be able to start the car without depressing the clutch, reducing engine wear;
not have to worry about post cat o2 sensors/codes; loose the ability to monitor one cam shaft for deviation from ideal.
Thanks, the anniversary do have the larger MAF diameter but I guess the throttlebody might be the smaller one. So if one is going all the way (Airbox, MAF & TB) I can see the logic behind getting the 996 tune over the anniversary.

Quadcammer 03-24-2020 07:33 AM
Quote:
Originally Posted by maytag (Post 613782)
Y'all running the softronic: that passes your local emissions? Or are these track cars?

Sent from my SM-G970U using Tapatalk
no problems with the OBD2 plug in test in my state with the softronic. No codes found, all monitors reporting

jaykay 03-24-2020 12:40 PM
Quote:
Originally Posted by Quadcammer (Post 613933)
no problems with the OBD2 plug in test in my state with the softronic. No codes found, all monitors reporting
+1, but the standard 3.2 Softronic tune is geared for the stock MAF diameter

maytag 03-26-2020 06:30 PM
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) https://uploads.tapatalk-cdn.com/202...cccce8e3b1.jpghttps://uploads.tapatalk-cdn.com/202...a70cf2357d.jpg

Sent from my SM-G970U using Tapatalk

Robert986 03-27-2020 02:25 PM
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 03-27-2020 04:02 PM
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.

jsceash 03-28-2020 05:38 AM
Quote:
Originally Posted by maytag (Post 613782)
Y'all running the softronic: that passes your local emissions? Or are these track cars?

Sent from my SM-G970U using Tapatalk
PA does minimal test ECU codes and sniffer as long as O2 trace is good car passes. I'm still street-able and passed inspection 3 years straight with my set up. 3.6L, 987 Airbox, 110 mm silicon connector pipeand reducer, 90mm MAF, 74 mm TB, IPD Plenmun (pebbled style). Pollished ballanced crank. H-beam carillo rods. 12.2 Compression ratio, #1 O2 i catless header, #2 O2 after 200cnt mid-pipe cat, Modified Special Edition Softronics Program. Edited fuel curve and map air for displacement. compression and MAF volume

Robert986 03-28-2020 08:36 AM
Quote:
Originally Posted by blue62 (Post 614306)
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 03-28-2020 08:49 AM
Quote:
Originally Posted by Robert986 (Post 614361)
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. ;-)

Sent from my SM-G970U using Tapatalk

Robert986 03-28-2020 09:01 AM
Quote:
Originally Posted by maytag (Post 614364)
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! :cheers:

blue62 03-28-2020 11:14 AM
Quote:
Originally Posted by Robert986 (Post 614361)
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:D

blue62 03-28-2020 11:37 AM
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 03-28-2020 03:59 PM
Quote:
Originally Posted by blue62 (Post 614388)
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:D
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?

Robert986 03-28-2020 04:04 PM
Quote:
Originally Posted by blue62 (Post 614391)
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.


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