Which filter is the best flowing? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 25 (permalink) Old 09-14-2009, 07:55 PM Thread Starter
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Which filter is the best flowing?

All this talk about crushing filters has got me thinking about how all the after market filters flow compared to each other.

I know that K&n filters flow better than an open intake and at the same time having hepa filtering qualities.

let's say that you can't get ahold of a K&N. How would a PG7or 5 flow compared to a 6637 or other after market filter?

W a GT42, is a PG7 too restrictive? Is there a larger washable filter that would fit in place of the PG7?

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post #2 of 25 (permalink) Old 09-14-2009, 09:57 PM
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Re: Which filter is the best flowing?

I would look into AFE.

6637s have unparalleled filtering capabilities but can be restrictive at high HP.

K&N let too much through.

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post #3 of 25 (permalink) Old 09-14-2009, 10:19 PM Thread Starter
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Re: Which filter is the best flowing?

Does anybody have a link that will just show the AFE filters and sizes? I looked on the site, but it only really shows applications.

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post #4 of 25 (permalink) Old 09-14-2009, 10:51 PM
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Re: Which filter is the best flowing?

There is a new one out there called S&B that i am currently trying out the box is better and battery tray than the afe kit if your looking for a air filtration kit.

S&B Air Intake, Air Dog II, Fuel Bowl delete with regulated return, 4" Exhaust.
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post #5 of 25 (permalink) Old 09-14-2009, 11:05 PM
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Re: Which filter is the best flowing?

I'm running an S&B R1264 if you want to look that up. It's the largest filter they make with a 5" outlet.

I would be interested to know how many guys run inlet piping that is 4", and how many like myself stepped up to 5" all the way to the turbo. I think that can have an effect on the intake restriction.

Dave

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post #6 of 25 (permalink) Old 09-14-2009, 11:12 PM Thread Starter
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Re: Which filter is the best flowing?

Quote:
Originally Posted by smokyred View Post
I'm running an S&B R1264 if you want to look that up. It's the largest filter they make with a 5" outlet.

I would be interested to know how many guys run inlet piping that is 4", and how many like myself stepped up to 5" all the way to the turbo. I think that can have an effect on the intake restriction.

Dave
I want to go up to a 5" pipe from the airbox to the turbo. Right now I have a 4". The AFE is 5" at the airbox though. It would be an EZ fit w a GT42.

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post #7 of 25 (permalink) Old 09-14-2009, 11:16 PM
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Re: Which filter is the best flowing?

Quote:
Originally Posted by smokyred View Post
I'm running an S&B R1264 if you want to look that up. It's the largest filter they make with a 5" outlet.

I would be interested to know how many guys run inlet piping that is 4", and how many like myself stepped up to 5" all the way to the turbo. I think that can have an effect on the intake restriction.

Dave
My compressor housing inlet is only 4", so there is really no reason to have a 5" then reduce back down to 4" unless you have a huge turbo. But hey, bigger is better.......

On Edit: nevermind smokey red, you have twins. Guess you need all the flow you can get.

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post #8 of 25 (permalink) Old 09-14-2009, 11:33 PM
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Re: Which filter is the best flowing?

Quote:
Originally Posted by skav View Post
W a GT42, is a PG7 too restrictive? Is there a larger washable filter that would fit in place of the PG7?
I destroyed a PG7 filter when I was running a GT42. Went to the 5-Layer and never had another problem. I was using all 5" piping as well.
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post #9 of 25 (permalink) Old 09-14-2009, 11:43 PM Thread Starter
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Re: Which filter is the best flowing?

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Originally Posted by RockinJW View Post
I destroyed a PG7 filter when I was running a GT42. Went to the 5-Layer and never had another problem. I was using all 5" piping as well.
What part number did you go with? It looks like you can rotate the ABS piece 180 degrees in the sheet metal frame if you reloacted the battery. That would give you space for a lot bigger filter.

I am actually thinking of moving my batteries to the pass frame to open up some room in the egine compartment.

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post #10 of 25 (permalink) Old 09-15-2009, 12:07 AM
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Re: Which filter is the best flowing?

Not sure of the part number. It had a 5" inlet, was like 7 1/2" in diameter. Fit right behind the battery in the factory airbox location. I've got a picture of it on my laptop, I'll try and post it.
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