How about mushroom filters?

[Guest]

There doesn't seem to be alot on this form of filtration. I hear they really clean and efficient. Any one with experience they'd like to share?

[mattapo]

i saw a review a number of years back that showed they were the best filter

[Guest]

 mattapo said:

i saw a review a number of years back that showed they were the best filter

The foam uni filters seem to be the best ie lowest microns and best air flow rate plus cost

[Joker]

still OEM unless your going to go extra effort and add a cold air box

[Guest]

Foam on average filters nearly the worst.

[Guest]

Yeah but they can't sell filters that are going to cause engine/turbo damage?

[Guest]

 GT007 said:

Yeah but they can't sell filters that are going to cause engine/turbo damage?

who cant? why not? any one can sell anything

-smurff

[Guest]

Yeah.

I mean larger brands, new items. The type of stuff found at repco and named stores.

Not dodgy. (Dark alley way)

There'd be an out cry.

??

[Guest]

most companies do testing, i guess if they deem it to be ok they will sell it.

what they deem to be ok is i guess how much money they put into it and what they want back etc.

-smurff

[Guest]

Yes this is true.

Im waiting to hear back from possum motorsport.

[Guest keltik]

Long term, all aftermarket filters are crap.

[subieboy]

 keltik']

Long term, all aftermarket filters are crap.

+1

Foam on average filters nearly the worst.

+1

[quote name='GT007 said:

Yeah but they can't sell filters that are going to cause engine/turbo damage?

Tui comes to mind here...

[Guest]

yeah right

Thanks for the constructive comments. 8)

[Guest keltik]

Seriously it was a constructive comment. In the short term, POD filters are fun. But if were talking a long term investment. Your much better off sticking to a paper filter as they really do a much better job. Id sacrifice one or 2kw for a cleaner intake and less dust eating its way past my piston rings and valve stems.

In the short term tho, its definately fun to hear lots of spooly whooshing turbo noises.

[Guest]

http://www.bobistheoilguy.com/airfilter/airtest1.htm

 

Another con is the way the figures are manipulated. Advertising may claim that you only lose less than 2% of oem filtering ability.

You thinks : Hey, losing 1.8% is nothing really, compared to that spine-ripping power boost I've always lusted for!

Alas, they typically reach that figure by subtracting 98% (new filtering ability) from 99.8% (stock filter). Do the math and you see that the overpriced "performance" garbage lets in 20 particles (of so many microns) in every 1000, while the stock 'grandma' filter only 2 out of 1000. Twenty versus two, that is ten time worse in my book. Depends how you look at it, really...

[Joker]

why bother - no filter gains almost zero HP over OEM Paper many times...

[sultan]

 JoKer said:

why bother - no filter gains almost zero HP over OEM Paper many times...

that's a confusingly worded post

do you also mean that all filters lose mostly some HP over OEM paper a few times?

[Koom]

 sultan']

that's a confusingly worded post

do you also mean that all filters lose mostly some HP over OEM paper a few times?

[quote name='JoKer said:

having no filter, gains almost zero HP over what OEM Paper filter achieves...

[NotAWhiteGTB]

If you want to do something worth while with your intake, the best thing to do is improve the amount of cold air it is getting.

[GC8E2DD]

 Qwerty']http://www.bobistheoilguy.com/airfilter/airtest1.htm

Great link Qwerty. This says it all for me.

[quote name='Bob said:

The max pressure drop in this test was seen at only 7.0 inches of water or 0.25 psi. The factory airbox and piping with no filter yielded a pressure drop of 5.0 inches of water or 0.18 psi. That means that the b]worst filter[/b] in this test only caused a pressure drop of 0.07 psi. In my opinion, this means that if you are picking an air filter based on performance, you probably aren't doing your car any favors.

[Guest]

Yeah ok basically.

There is a compromise between clean well filtered slow air and free flowing (not so clean) performance air.

I dont think the very small amount of hp increase is worth risking motor damage that would intern lower that hp gain back down to where it was before the after market free flow filter.

[madmike]

 GT007 said:

Yeah ok basically.

There is a compromise between clean well filtered slow air and free flowing (not so clean) performance air.

I dont think the very small amount of hp increase is worth risking motor damage that would intern lower that hp gain back down to where it was before the after market free flow filter.

+1...

Unless your looking for big big numbers stick with the standard airbox an filter....

[familyman]

I've also seen on several occasions where foam shroom filters tend to shrink and cause up to 1.5mm gap around edge of plastic surround.

Then you may as well have no filter at all.

[subieboy]

 familyman said:

I've also seen on several occasions where foam shroom filters tend to shrink and cause up to 1.5mm gap around edge of plastic surround.

Then you may as well have no filter at all.

That happens to every foam filter exposed to high temps and also over age...

Factory for the win really...

[Guest]

Just get a K&N panel filter like i have, Mint as.

Give it a clean once a month and shes sweet.