HKS filter?

Discuss the RB20, RB25 and RB26 series engines.
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rustbucket
Posts: 224
Joined: Tue Apr 11, 2006 3:05 am
Car: '90 s13 RB25DET SII

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Which one do you think will flow better or will they flow the same?

The super mega flow? W/200mm filter with 80mm to TB

or

The super mega flow mini? W/150mm filter with 80mm to TB



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Carl H
Posts: 5985
Joined: Mon Aug 04, 2003 4:09 am
Car: 1995 Nissan 240SX SE RB30DET

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bigger filter is always better, dont want to choke the inlet.but then again hks filters are poo anyways soo get a good one like the apexi bit.

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rustbucket
Posts: 224
Joined: Tue Apr 11, 2006 3:05 am
Car: '90 s13 RB25DET SII

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Why do you think they are poo? I have one on my WRX and I think it flows great, but then again ive never had anything else to compare it too.

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krayton
Posts: 1090
Joined: Tue Jun 24, 2003 11:10 am

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flows great cause its not catching anything :S

they did a test somewhere on all the air filters. alot of them flowed great, too bad they didnt pick up anything

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rustbucket
Posts: 224
Joined: Tue Apr 11, 2006 3:05 am
Car: '90 s13 RB25DET SII

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Oh, ok, I get what your saying. Guess I'll do some more research then.

Darius
Posts: 4820
Joined: Sun Mar 02, 2003 9:48 am
Car: RB25DET S14 - 665 WHP (SOLD)
Location: Chicagoland

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I remember a side by side comparison of quite a few top name brands and those included some expensive foam filters. The Apexi flowed the best in that particular test and so that is what I went with. I don't have it installed yet, but it looks good on my shelf

And yes bigger is typically better with all other things being equal. A smaller, smoother (laminar) flow might create less head loss than a larger, turbulent flow. But for all intensive purposes, bigger is better for reducing head loss to the compressor which is what we are all trying to do.


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