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Old 12-27-2017, 05:13 AM   #1
jysaw
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Filter dimension/size

How does the size of a clamp on filter affects performance? I am planning to DIY a CAI and I am wondering what filter size should I use
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Old 12-27-2017, 08:53 AM   #2
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Bigger is better imo...but to calculate it correctly, it would help to know the cfm needs of the car to know the cfm capacity needed for the intake/filter.

Best bet is likely a filter right off the maf (non oiled) probably could do about a truck sized filter that way.
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Old 12-27-2017, 09:34 AM   #3
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Originally Posted by GroceryGTIer View Post
Bigger is better imo...but to calculate it correctly, it would help to know the cfm needs of the car to know the cfm capacity needed for the intake/filter.

Best bet is likely a filter right off the maf (non oiled) probably could do about a truck sized filter that way.

Ive always read that having a filter right on the MAF is a bad thing, as the maf need a semi straight flow of air to calculate how much is going into the engine. And putting a filter right on the end disrupts air flow.
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Old 12-27-2017, 09:46 AM   #4
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You need to keep the MAF in the same location otherwise you'll run into a bunch of issue. If you want the most noise (as in BOV noise) and performance you'd want a "bell mouth/velocity stack" filter. Same style as the integrated engineering intake.
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Old 12-27-2017, 10:51 AM   #5
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You need to keep the MAF in the same location otherwise you'll run into a bunch of issue. If you want the most noise (as in BOV noise) and performance you'd want a "bell mouth/velocity stack" filter. Same style as the integrated engineering intake.
and 42dd if im not mistaken uses a bellmouth
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Old 12-27-2017, 12:47 PM   #6
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Ive always read that having a filter right on the MAF is a bad thing, as the maf need a semi straight flow of air to calculate how much is going into the engine. And putting a filter right on the end disrupts air flow.
Plenty of people have done it. The carbonio is a straight path, VWR, forge, USP's tearduct intake, etc, all do it. I don't see any issue, but idk.
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Old 01-01-2018, 10:57 PM   #7
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is the heat shield necessary?
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Old 01-02-2018, 09:38 AM   #8
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is the heat shield necessary?
necessary probably not does it shield heat.. probably.
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Old 01-02-2018, 05:02 PM   #9
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Just added a velocity stack to my cold air intake. I'm going to add a heat shield b/c why not.

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Old 01-03-2018, 12:45 AM   #10
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Just added a velocity stack to my cold air intake. I'm going to add a heat shield b/c why not.

Is that the apexi set up?
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Old 01-03-2018, 02:51 AM   #11
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what difference does it make if the filter is straight as in the picture above compared to 90 degree - the filter is positioned at the right side
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Old 01-03-2018, 08:19 AM   #12
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Almost all of the aftermarket intakes on the market today are undersized in terms of filter element surface area. After calculating the 35lb/min flow rate on my old K04, the filter I chose to use was larger than the one pictured here. Moving to the larger filter increased MAF values substantially.

Clamping on a filter to the MAF housing is fine, the MAF housing has an air straightener in place which will smooth the airflow readings. What you do need to help the air straightener is a 2.5" to 6" velocity stack if you're retaining the stock MAF housing. Then grab a 6" filter. Forward facing or straight facing doesn't matter as per my testing.

Here is what I ran a while back for a 3" intake pipe:

3” velocity stack: http://www.spectreperformance.com/se...aspx?prod=9602

AEM 21-2100DK filter: http://www.aemintakes.com/search/pro...Prod=21-2100DK

1 x 3.0" Silicone Straight Coupler, Black http://www.siliconeintakes.com/silic...ses-p-617.html

2 x T-Bolt Clamp for 3.0" Silicone Parts http://www.siliconeintakes.com/t-bol...d81d5371c0616b

The filter comes with a 6” clamp to hold the filter on the velocity stack
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Old 01-03-2018, 08:48 PM   #13
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Is that the apexi set up?
Its the unitronic piping with a velocity stack added. The same setup Hyde described, just slightly smaller filter.

Cleaned it up a little bit.
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Old 01-04-2018, 12:23 AM   #14
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what are the differences between the straight and a cone filter?
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