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not12listen
07-22-2010, 04:54 PM
A while ago, I purchased and installed an Injen intake for my Subaru. A while later, I had to replace the Injen filter with a 'Spectre' one from the local auto parts store.

After killing 2 MAF sensors, I decided to put in a piece of cheese cloth, just to get an idea of how much garbage was getting past the filter. Here is the photo evidence. This is after 2 months of daily driving.

http://img.photobucket.com/albums/v137/not12listen/subaru/intake/P1010014.jpg

So, my basic warning to everyone - please do not buy cheap cone filters.

ChrisD
07-22-2010, 05:15 PM
Interesting, I've got a cheapo on mine...

bloodxandxink
07-22-2010, 05:20 PM
fantastic... i just got a spectre

Siyx
07-22-2010, 05:26 PM
So any recommendations on a good one to buy? K&N ?? HKS??

bloodxandxink
07-22-2010, 05:53 PM
i think im gonna just run the spectre and write to them complaining about their crappy filter if it causes problems.... they have a warranty on it so....

Siyx
07-22-2010, 06:00 PM
Does the warranty cover MAF's ?

UtahSleeper
07-22-2010, 06:06 PM
Someone should do this witha foam filter.

not12listen
07-22-2010, 08:54 PM
fyi - the air filter rested behind the passenger side (nearest) fog light.

as per recommendations, at the moment i have none. i've done zero testing with any other filter. but, to credit given where credit is due, i never had any issues with the original Injen filter - the problems only happened once i installed the cheap Spectre filter.

and here is a photo for reference as per placement.

http://www.autotechpassion.com/wp-content/uploads/2008/06/99rs_impreza2.jpg

Hipster Lawrence
07-22-2010, 10:43 PM
Is this an oiled filter? If so that is what killed your MAF not dirt.

Siyx
07-22-2010, 10:51 PM
Ahhh the story unfolds, so what your saying is that there was pretty much no protection from "flying debris" such as dirt, mud, small children and so on. It wasn't tucked up nice and safe under your hood but rather in direct fire of anything that got passed your fog light.
:D
I had a foam filter in the Supra, HKS 8" mushroom type. I was forever shoveling dirt particles out of the MAF. It was located behind the passenger headlight on a MKIII Supra, so it was somewhat protected but still sucked in everything.

Shadowlife25
07-22-2010, 11:02 PM
Is this an oiled filter? If so that is what killed your MAF not dirt.

Jesse, from what I've seen most all those generic filters are the dry type.

Oiled filters tend to be K&N or higher end filters designed for NA engines.

not12listen
07-23-2010, 12:26 AM
Ahhh the story unfolds, so what your saying is that there was pretty much no protection from "flying debris" such as dirt, mud, small children and so on. It wasn't tucked up nice and safe under your hood but rather in direct fire of anything that got passed your fog light.
:D
I had a foam filter in the Supra, HKS 8" mushroom type. I was forever shoveling dirt particles out of the MAF. It was located behind the passenger headlight on a MKIII Supra, so it was somewhat protected but still sucked in everything.

there is plastic mud guards under and behind it. the fog light assembly in front of it does block out quite a bit of debris as well. in fact, yesterday when i was removing the aftermarket intake and re-installing my factory intake, when looking forward towards the rear of the fog light, i could not see any light at all.

that is NOT to say that dirt would not get back there, just that it would be a task to. :)

as yes, it is the dry type filter.

again, my basic message is: do not buy cheap filters. get a well known and trusted brand (ie. K&N, HKS, etc).

---------- Post added at 04:26 PM ---------- Previous post was at 03:49 PM ----------

http://www.mkiv.com/techarticles/filters_test/2/

take this article with a grain of salt...

kungFUBAR
07-23-2010, 03:36 AM
as yes, it is the dry type filter.

Picture of said filter?

not12listen
07-23-2010, 03:46 AM
sorry about the flash. i have no idea how to turn it off... :/

http://img.photobucket.com/albums/v137/not12listen/subaru/intake/P1010015.jpg

http://img.photobucket.com/albums/v137/not12listen/subaru/intake/P1010016.jpg

http://img.photobucket.com/albums/v137/not12listen/subaru/intake/P1010017.jpg

http://img.photobucket.com/albums/v137/not12listen/subaru/intake/P1010018.jpg

http://img.photobucket.com/albums/v137/not12listen/subaru/intake/P1010019.jpg

kungFUBAR
07-23-2010, 04:03 AM
Interesting, I was under the impression that all of their universal filters were oiled :dunno:

not12listen
07-23-2010, 04:21 AM
no sir. from my reading, it seems to be roughly 50% are oiled. i'm also seeing a pretty clear picture being drawn out as well - a pretty obvious one at that.

the higher the flow of the air filter, the more it allows dirt particles into the engine. so, if you want to squeeze each and every extra bit of power possible, you will (most likely) also be shortening the life of the engine due to particles of dirt & debris working their way through every part of the engine.

now, that is not to say that i will seal up my engine and never fire it up, or accidentally forget to change my oil and filter at EXACTLY 2500 miles. but, where is the middle ground? where do you get awesome filtering with good air flow?

AMSOil/Injen keeps touting their nanofiber setup, which sounds cool. but, in real world testing, the AMSOil air filter did not do a good job...

so, yet again, we're all left to deal with K&N/HKS who allows a ton of dirt in (with awesome flow), AMSOil whom appears to be WORSE... AEM (if they have it for your application - or similar enough), Napa or Fram.

yeah. of the lot, i'd probably go with Napa then AEM. and not touch any of the others.

http://www.bobistheoilguy.com/cms/index.php?option=com_content&view=article&id=66&Itemid=76

kungFUBAR
07-23-2010, 05:04 AM
Middle ground? I think you worry too much.

Grot
07-23-2010, 05:05 AM
From the link posted above, the Apexi seems to be the best of both worlds.

not12listen
07-23-2010, 06:56 AM
Middle ground? I think you worry too much.

i am well aware of this. :) i over think the hell out of every detail for my car. the absolute last thing i want is for something to go horribly wrong because i skimped out on something, or did not do enough research. :)

pinoyGT4
07-23-2010, 09:46 AM
i am well aware of this. :) i over think the hell out of every detail for my car. the absolute last thing i want is for something to go horribly wrong because i skimped out on something, or did not do enough research. :)

well we can never be too careful or meticulous about our cars right.. :disturbed:

anyway, im using HKS.. yes it is quite dirty but it gives me the power i want.. and its not all fun and clean here in PI.. haha!

but anyway, its still something that change oil can resolve.. :ooo:

not12listen
07-23-2010, 03:56 PM
the dirt that comes into your engine slowly layers onto the inside of your intake manifold, the intake and exhaust valves, onto the pistons, and throughout the entire exhaust stream as well. that doesn't even count once its introduced to your oiling system via the cylinder walls... your oil pickup, the oil pump, and each and every portion of the engine including the rod journals, the main journals, the cams...

so, when you finally do change your oil (we'll guess 3000 miles) - that means that you've allowed 3000 miles of dirt wear to be put through each and every portion of the engine that oil contacts.

i do understand that the oil filter will attempt to catch and stop as much as it can, but there is always some bit that is so small that even a high quality filter cannot stop.

i'm not saying that you MUST go out and replace the HKS filter or anything of the nature. my thing is just being aware of what your actions are allowing. :)

not12listen
07-23-2010, 03:56 PM
the dirt that comes into your engine slowly layers onto the inside of your intake manifold, the intake and exhaust valves, onto the pistons, and throughout the entire exhaust stream as well. that doesn't even count once its introduced to your oiling system via the cylinder walls... your oil pickup, the oil pump, and each and every portion of the engine including the rod journals, the main journals, the cams...

so, when you finally do change your oil (we'll guess 3000 miles) - that means that you've allowed 3000 miles of dirt wear to be put through each and every portion of the engine that oil contacts.

i do understand that the oil filter will attempt to catch and stop as much as it can, but there is always some bit that is so small that even a high quality filter cannot stop.

i'm not saying that you MUST go out and replace the HKS filter or anything of the nature. my thing is just being aware of what your actions are allowing. :)