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Discussion Starter · #1 ·
Has anybody ever cut out the plastic mesh that sits right behind the filter? Seems somewhat restrictive and haven't seen any other boosted cars using it. Any thoughts?
 

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Re: (sh8kdwn)

I know that a lot of people pull that screen out on other cars w/o issues. I think I have read in SS before that it will cause issues. Hell, the MAF on these cars poop the bed enough as it is, taking out the screen probably would not help.
 

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Re: (sh8kdwn)

Thinking back to fluid dynamics, because there is a single directional, very tight input of air coming into the airbox, you could create a very laminar (and likely uneven) airflow pattern across the filter surface, paricularly on a circular filter. Ideally, this screen could help normalize the air pressure throughout the air intake by creating turbulent flow patterns.

Realistically, it is probably a debris screen. If a rock were to blow through your airbox AND the filter, it would be stopped by this thing and not by, say, your MAF.

Still, if its there, and it cost money in the form of extra plastic, it's probably there for a reason. Restriction wise, it should have a bigger surface area than the stock air intake, so it's not going to cause a problem.
 

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Re: (xman03)

I cauld my friend. Id leave it there if you need more air flow lets port out the charg pipewe can shave about 2-3 mm off it
 

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Re: (xman03)

Quote, originally posted by xman03 »


Would it affect the readings without it?

Yes. To what extent, I don't know, but yes.

If you want to get scientific about it, you'll need some instruments. Make a manometer using a water tube and drill a port post-MAF. Take a reading with and without the screen and let us know if it helps things.

i'm guessing no, but you never know.

Also, it would be prudent to run some kind of scan tool to measure how it affects performance.

Bottom line is it's there to clean up airflow and help the MAF sensor work better. Given the size of the mesh it's probably not much of an impediment.
 

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Discussion Starter · #10 ·
Re: (VolvokidS60R)

Quote, originally posted by VolvokidS60R »
I cauld my friend. Id leave it there if you need more air flow lets port out the charg pipewe can shave about 2-3 mm off it

We already shaved some from the outside, it's gonna be as thick as a soda can if we port it
. The issue is people having negative pressure in the airbox especially tuned so I was thinking taking out the plastic mesh would aleviate the problem.

- Looked at some other forums, seems like a good idea to leave it on. O well.
 

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Re: (xman03)

eaa im just afread to much crud is goin to get on maf but poop we can see what happens
 

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Re: (Needsdecaf)

Quote, originally posted by Needsdecaf »


Yes. To what extent, I don't know, but yes.

If you want to get scientific about it, you'll need some instruments. Make a manometer using a water tube and drill a port post-MAF. Take a reading with and without the screen and let us know if it helps things.

i'm guessing no, but you never know.

Also, it would be prudent to run some kind of scan tool to measure how it affects performance.

Bottom line is it's there to clean up airflow and help the MAF sensor work better. Given the size of the mesh it's probably not much of an impediment.
Well i can allways read EVER thing in the ECM sooo.. we do a test with and with out, to get a KPA meserment. if it stays nere 14kpa were good! if not we cauld run into problems
 

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Re: (xman03)

Quote, originally posted by xman03 »


We already shaved some from the outside, it's gonna be as thick as a soda can if we port it
. The issue is people having negative pressure in the airbox especially tuned so I was thinking taking out the plastic mesh would aleviate the problem.

- Looked at some other forums, seems like a good idea to leave it on. O well.

For under $100, the IPD Ram Air kit will alleviate most all of the vacuum created by the spooled turbo. That's probably the best way to combat vacuum at WOT, for example (although it obviously has a better effect in any gear other than 1st).
 

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Re: (xman03)

Quote, originally posted by xman03 »

The issue is people having negative pressure in the airbox especially tuned so I was thinking taking out the plastic mesh would aleviate the problem.
.

That was measured in the airbox, so only the path from the airbox to the outside world would affect that reading.

And as said, the Kelly / Lill / IPD CAi will generally alleviate that problem.

To test the effect of the screen, you'd have to measure the pressure post MAF, which I don't think anyone has done yet.
 

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Re: (xman03)

Quote, originally posted by xman03 »


Would it affect the readings without it?

I've removed mine before and can confirm it WILL set codes. Specifically MAF Flow too High. So back in it went. It only took a very short trip to get the MIL and surged and bucked under boost.

BTW, you don't have to cut it out, it will pop out with the correct force.
 

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Re: (Oceans60R)

Quote, originally posted by Oceans60R »
I've removed mine before and can confirm it WILL set codes. Specifically MAF Flow too High. So back in it went. It only took a very short trip to get the MIL and surged and bucked under boost.
This is the expected result. The grid is called a flow straightener, it helps distribute the flow across the surface of the pipe so that the tiny sampling area of the MAF sensor actually represents what is happening, as accurately as possible.

With turbulent flow across the MAF if your intake setup sends a stream into the tiny sensor but other parts of the pipe are seeing less flow the reading will show more airflow than actual. Vice versa if that "jet stream" of sorts avoids the sensor area, it would get into the engine unnoticed (i.e. with incorrect fueling to match).

Leave the flow straightener in place.
 

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Re: (-Pascal)

Quote, originally posted by -Pascal »

This is the expected result. The grid is called a flow straightener, it helps distribute the flow across the surface of the pipe so that the tiny sampling area of the MAF sensor actually represents what is happening, as accurately as possible.

With turbulent flow across the MAF if your intake setup sends a stream into the tiny sensor but other parts of the pipe are seeing less flow the reading will show more airflow than actual. Vice versa if that "jet stream" of sorts avoids the sensor area, it would get into the engine unnoticed (i.e. with incorrect fueling to match).

Leave the flow straightener in place.

Wow, I can't believe I was even close. I guess that degree was worth it.
 
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