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Discussion Starter #1
Well the BMC CDA is on its way and from the wealth of info here it should be a pretty straight forward install (I hope!).

Question: with the goal of a nice clear air pathway has anyone played around with the MAF - specifically removing the molded plastic "grid" on the filter side? Any thoughts on why it is there would be welcome as well....
 

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Mafs are usually pretty good at not restricting airflow much better than the afms I'm used to. If you have a proper filter I can't see the use of that mesh though.

Having said that it must be there for a reason. The bmc is a good bit of kit though.

I suspect the effect of that mesh is negligable anyway and the best use of your time would be spent creating a heat shield for the new filter or improving cold airflow to the filter.
 

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I seem to remember taking the steel mesh out of one of mine.

I left the plastic one in because it's there to straighten airflow across the MAF I think? Turbulent airflow in that area creates duff readings and bad fuelling if I remember correctly? I read about it somewhere at the time, but can't remember where now!

Whether it made any difference i'm not sure. Possibly not! :)
 

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Having taken a look at the picture again and thinking that mesh isn't fine enough to be of any use it dawned on me!

Do alfa airfilers have a habit of grenading themselves??? :lol:
 

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Discussion Starter #5
After trolling the web for a couple of hours the concensus seems to be that modified MAFs are mainly used in specialised racing applications or where a high performance engine is being built from scratch with lots of tuning expertise - following is from a US forum;

"For 99% of swappers it is generally recommended use a factory screened maf because of the many different intake pipe options people are using. There are factory MAF's that do not have a screen and they are "tuned" for the specific intake (Corvette). It is highly recommended not to "de-screen" a "screened" MAF. These are a tuning nightmare"

Unstable tuning also resulted from de-screened MAFs on some local Aussie V8 forums

The screen does indeed seem to be there to "straighten up" the air flow.... looks like it will be staying there!

Cheers
 

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i have an induction kit and iv removed the screens on these before. helps when being mapped, as there is clean air getting into the engine, nothing getting in the way.

unmapped, no major difference, better pick up from low revs, and also induction noise is increased and crisper.

just done it to mine yesterday, and its much the same as it was in the stilo (as above)

but unless your car has an induction kit and mapped, there will be little if any difference:thumbs:
 

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The grid is there to provide a laminar (layered) flow of air over the element.

If you remove it the airflow going over the sensor will be turbulant, which will make the MAF give false readings.

So removing it will likely make performance worse.
 

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I don't really see it making that much difference, air expands to fill whatever space it is in, that and the fact its being sucked into the engine by a relatively small tube. All i can see the grid doing is making the flow more turbulant.
 

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The grid is there to provide a laminar (layered) flow of air over the element.

If you remove it the airflow going over the sensor will be turbulant, which will make the MAF give false readings.

So removing it will likely make performance worse.
well i can defo say mine aint worse, bit lathargic at the bottom, but that is not issue, much better at the top end, were it spends most of its time tbh
 

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I think the mesh screen behind the grid is to catch "large" items should the paper air filter get punctured. However if you've got a K&N type filter then there's no need for it eh?

The grid is definitely to straighten airflow. I've seen other MAF housings that just had a profiled cross in them rather than the full grid. Wonder if that's worth the effort though......
 
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