K&n upgrade - Page 5 - Subaru Outback - Subaru Outback Forums
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post #41 of 55 (permalink) Old 06-04-2018, 09:27 AM
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garbage. check out studies and threads on bobtheoilguy.com, they don't filter much and their "flow" isn't much better than a quality paper element. after my last couple vehicles and messing with intake, ive come to the conclusion that the intake system on MOST cars are designed to allow the maximum amount of air into the system that benefits the engines performance.
+1, even though automakers can be suckered into such nonsense. My '89 IROC Camaro came from the factory with K&N air filters installed.

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post #42 of 55 (permalink) Old 06-04-2018, 09:40 AM
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I wouldn't say their filters are garbage. Not at all but I would question their HP claims when you're not running wide open throttle.

If you over oil it you will coat the MAF sensor with oil but if you don't it's a fine filter and it filters better the longer left on.

I have one on a 2003 Civic with 160k on it and the UOAs are all stellar, no accelerated wear numbers, silicon is always low and it gets cleaned every 3 years or so.

Just don't rely on the butt dyno but actual data. The filter is good but recognize the parameters.

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post #43 of 55 (permalink) Old 06-04-2018, 09:43 AM
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K&N is junk, go with AFE or AEM.
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post #44 of 55 (permalink) Old 06-04-2018, 10:02 AM
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The problem with oiled filters like the K&N is that consumers using it are over-oiling it.
I've never seen an over oiled paper filter, whether installed by a pro or an amateur.
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post #45 of 55 (permalink) Old 06-04-2018, 10:20 AM
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The entire debate about how "pure" the air is that goes in to the engine needs to be kept in perspective. Maybe you can make the intake air in to this HEPA-grade, pollen-free, pure gas, but.. one foot later we are dumping soot filled, dirty EGR gas and oil saturated PCV vapors right back in to the intake manifold.

All of this stuff gets baked on because the engine ends up being DI or TDI and as soon as this witches brew hits the intake valve stems it forms an ever-increasing layer of carbon, crud and oil.

The only thing that you have kept out is bugs.

If you want to keep the intake air cleaner then we would be talking about EGR particulate filters, PCV oil catcher bottles or even deletes of the EGR or PCV systems.
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post #46 of 55 (permalink) Old 06-04-2018, 10:38 AM
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If you want to keep the intake air cleaner then we would be talking about EGR particulate filters, PCV oil catcher bottles or even deletes of the EGR or PCV systems.
Which is why Frankie has custom routed dual catch cans. This motor retains all of the factor "emissions" components. It removes oil on either side of PCV operation and ... It has glitter.
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post #47 of 55 (permalink) Old 06-04-2018, 01:25 PM
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I've never seen an over oiled paper filter, whether installed by a pro or an amateur.
I put an "over-oiled" K&N filter (straight out of the shipping box) in my VW Jetta TDI and I had to have the MAF cleaned after several miles of driving - back in 2006.
I sold that car within one year or less! Traded it for Forester and the Subaru dealer didn't even keep it on their used car lot referencing to numerous malfunction repairs that they would have to do, if they would have kept it and sold it themselves.
They have wholesaled it to local a VW dealer.

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post #48 of 55 (permalink) Old 06-04-2018, 01:51 PM
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Which is why Frankie has custom routed dual catch cans. This motor retains all of the factor "emissions" components. It removes oil on either side of PCV operation and ... It has glitter.
I was thinking of throwing a catchcan setup on the WRX soon, even though i already have close to 1/4mil miles.

did you fabricate it or start with a kit?
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post #49 of 55 (permalink) Old 06-04-2018, 02:12 PM
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I was thinking of throwing a catchcan setup on the WRX soon, even though i already have close to 1/4mil miles.

did you fabricate it or start with a kit?
1st off, AIG, Crawford, KillerB, Radium Engineering ... they all make self draining , dual stage Air Oil Seperators. They are very expensive, over $300

I didn't make mine from scratch, although you could. I bought 2 catch cans. The 1st was a baffled AVO and it was expensive at the time $140. I though one can would catch all the vapor. It was be fore I understood the system. I have since found simple Cusco cans for $35. $35 is pretty cheap for a can with fittings. It would cost maybe $20 to replicate from the home depot plumbing section.

3" PVC tube
(2) end caps
brass fittings

You could do it that way.

Anyway with (2) cans, purchased or made, the real key is the plumbing. Radium Engineering conveniently posts a diagram on their website showing hows their's works. It's dual stage, for both sides of PCV operation. I just spit each operation to a separate can.

Both of mine have drain ports to remove, the "removed oil". The closed throttle (idle) side collect far more oil than throttling.

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post #50 of 55 (permalink) Old 06-04-2018, 05:55 PM
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so something like this is an okay starting point these days?

https://www.amazon.com/gp/product/B076BKV7JF/

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