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pilchardthecat's MAF screen mod
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pilchardthecat's MAF screen mod
By far the most restrictive part of the OEM intake system is the MAF screen. The pressure drop is several times greater than that either side of the filter itself.
You can't simple remove it though, as it is comprised of two parts, each with a specific purpose
- A thin metal mesh, which is designed to remove the turbulent flow inside the airbox and create a laminar flow in the tube that houses the MAF (this is required for MAF accuracy)
- A thick plastic mesh, which is an "air straightener" that forces the air to run straight down the tube past the MAF (it won't otherwise, partly due to turbulence, and partly due to the velocity stack inside the airbox (the trumpet shaped thing)
If you simply remove them, you will cause turbulent flow past the MAF and seriously degrade it's accuracy
The plastic mesh is the most restrictive part, and is effectively blocks more than 30% of the cross sectional area of the tube
My modification involves
- removing the wire mesh
- cutting away the plastic mesh
- replacing both with a thin metal honeycomb air straightener which acts to both straighten the air and induce laminar flow. This metal honeycomb only takes up about 4 or 5% of the cross sectional area of the tube
The pictures are bit crappy but you get the idea....
Enjoy.
You can't simple remove it though, as it is comprised of two parts, each with a specific purpose
- A thin metal mesh, which is designed to remove the turbulent flow inside the airbox and create a laminar flow in the tube that houses the MAF (this is required for MAF accuracy)
- A thick plastic mesh, which is an "air straightener" that forces the air to run straight down the tube past the MAF (it won't otherwise, partly due to turbulence, and partly due to the velocity stack inside the airbox (the trumpet shaped thing)
If you simply remove them, you will cause turbulent flow past the MAF and seriously degrade it's accuracy
The plastic mesh is the most restrictive part, and is effectively blocks more than 30% of the cross sectional area of the tube
My modification involves
- removing the wire mesh
- cutting away the plastic mesh
- replacing both with a thin metal honeycomb air straightener which acts to both straighten the air and induce laminar flow. This metal honeycomb only takes up about 4 or 5% of the cross sectional area of the tube
The pictures are bit crappy but you get the idea....
Enjoy.
Z4M Roadster.
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Re: pilchardthecat's MAF screen mod
Will have to try that .where do u get the tube honeycombe section from.
Moz
Sent from my GT-I9300 using Tapatalk 2
Moz
Sent from my GT-I9300 using Tapatalk 2
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Re: pilchardthecat's MAF screen mod
+1AlienZed wrote:Will have to try that .where do u get the tube honeycombe section from.
Moz
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Bumpy
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Re: pilchardthecat's MAF screen mod
I got mine here www.saxonpc.com/100mm-cells-for-100.html
You need the 4:1 ratio, and will need to trim to the correct diameter
You need the 4:1 ratio, and will need to trim to the correct diameter
Z4M Roadster.
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Re: pilchardthecat's MAF screen mod
Cheers for the info.now to get some
M
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M
Sent from my GT-I9300 using Tapatalk 2
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Re: pilchardthecat's MAF screen mod
What gains are obtained by doing this,apart from increased flow?
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Re: pilchardthecat's MAF screen mod
It works well with a couple of other mods I will share later (i made a carbon fibre intake ram/scoop for example). Throttle response is improved.
I also did some smoke/dye airflow tests, and the airflow over the maf is considerably smoother, which in theory will improve the accuracy of the output signal.
Surprisingly it sounds slightly better too.
I havent dyno tested it. I would be interested in any dyno/datalogging if anyone else decides to have a go. It costs about £12 and takes all of 10 minutes to do.
I also did some smoke/dye airflow tests, and the airflow over the maf is considerably smoother, which in theory will improve the accuracy of the output signal.
Surprisingly it sounds slightly better too.
I havent dyno tested it. I would be interested in any dyno/datalogging if anyone else decides to have a go. It costs about £12 and takes all of 10 minutes to do.
Z4M Roadster.
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- Lifer
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Re: pilchardthecat's MAF screen mod
Superb....
Between you and Exdos these "cheap" mods will soon relinquish 350bhp...
Between you and Exdos these "cheap" mods will soon relinquish 350bhp...
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Re: pilchardthecat's MAF screen mod
I think the combination of the maf screen + exdos "eureka" mod + ram scoop + free flowing exhaust will add 15 horses yes
Its a much better approach than a hot air cone filter (i have some inexpensive induction some noise mods that I will share too)
Its a much better approach than a hot air cone filter (i have some inexpensive induction some noise mods that I will share too)
Z4M Roadster.
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- Lifer
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Re: pilchardthecat's MAF screen mod
How much do you think the exhaust hinders if you do all the intake mods..?
I quite like the exhaust sound as it is..
I quite like the exhaust sound as it is..
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Re: pilchardthecat's MAF screen mod
Exdos has done some datalogging on that subject, he is better placed to answer than me, but i have only recently fettled with the exhaust and certainly noticed improved pick up and throttle response from the ram scoop and the MAF screen
Z4M Roadster.
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Re: pilchardthecat's MAF screen mod
[quote="pilchardthecat"]It works well with a couple of other mods I will share later (i made a carbon fibre intake ram/scoop for example). Throttle response is improved.
Any pics please
Moz
Any pics please
Moz
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Re: pilchardthecat's MAF screen mod
This is my cheapo induction noise mod.
Basically it involves making a super-thin carbon fibre skin for the outside of the top part of the air box, then cutting away parts of the thick plastic of the airbox and sealing back up with the carbon. My original plan was to fabricate a complete OEM airbox in carbon fibre, but i was so pleased with the results of this i still havent bothered to take the next step, as it would be very fiddly
The process is basically
- make a glass fibre mold of the airbox
- cut this down and use it as a template for the carbon
- Cut some nice big holes
- Stick the thin carbon "skin" on with resin
Result = lots more induction noise whilst completely retaining the efficiencies of the OEM intake system.
Basically it involves making a super-thin carbon fibre skin for the outside of the top part of the air box, then cutting away parts of the thick plastic of the airbox and sealing back up with the carbon. My original plan was to fabricate a complete OEM airbox in carbon fibre, but i was so pleased with the results of this i still havent bothered to take the next step, as it would be very fiddly
The process is basically
- make a glass fibre mold of the airbox
- cut this down and use it as a template for the carbon
- Cut some nice big holes
- Stick the thin carbon "skin" on with resin
Result = lots more induction noise whilst completely retaining the efficiencies of the OEM intake system.
Z4M Roadster.
- exdos
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Re: pilchardthecat's MAF screen mod
pilchardthecat,
I shall definitely try this mod. I've got a a couple of spare air-filter boxes/MAFs so I'll measure the aperture for the honeycomb screen (from memory its around 87mm diameter) to see what thickness of honeycomb is available. It might be possible to get the seller to produce something bespoke for a group buy?
I shall definitely try this mod. I've got a a couple of spare air-filter boxes/MAFs so I'll measure the aperture for the honeycomb screen (from memory its around 87mm diameter) to see what thickness of honeycomb is available. It might be possible to get the seller to produce something bespoke for a group buy?
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Re: pilchardthecat's MAF screen mod
I am very interested in any datalogging results you get
Z4M Roadster.