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Old 03-27-2005, 08:10 PM   #1
elighcash
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Default Converting to under scoop air filter.

What parts do I need to convert to the flat air filter that lays under the hood scoop? What subaru's come with this style stock and how hard is it to do to my 2001 2.5RS? Thanks.


NICK
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Old 03-27-2005, 08:18 PM   #2
Laugh Damon
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ummm... i might not understand the question... but i think you're refering to an intercooler, which is not an air filter...
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Old 03-27-2005, 08:24 PM   #3
elighcash
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Yeah, i know what the STI flat intercooler looks like, but is there anyone who has decided to lay their air filter flat there instead, to draw in cool air from the scoop?, just curious.
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Old 03-27-2005, 08:34 PM   #4
keirnna
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Yeah it is called the gravel sports intake.
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Old 03-27-2005, 08:40 PM   #5
Caplin 2.5
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Its a great idea, but you should be more worried about getting rain water goin into it....
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Old 03-27-2005, 10:00 PM   #6
Laugh Damon
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Quote:
Originally Posted by elighcash
Yeah, i know what the STI flat intercooler looks like, but is there anyone who has decided to lay their air filter flat there instead, to draw in cool air from the scoop?, just curious.
haha okay, sorry ya theres alot of weird questions going around here, so ya never know.

but yeah I think they found that the engine runs way too lean when the gravelsports intake is on... it wasn't so much the water, it takes quite a bit of water to hydrolock an engine.
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Old 03-27-2005, 10:24 PM   #7
Apoll_13
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Quote:
Originally Posted by Laugh Damon
haha okay, sorry ya theres alot of weird questions going around here, so ya never know.

but yeah I think they found that the engine runs way too lean when the gravelsports intake is on... it wasn't so much the water, it takes quite a bit of water to hydrolock an engine.

Yes, I beileve fully emerged does the trick.


If you want to DIY you could just cut a rectangle in the top of the box to the size of any K&N filter. Plug up the Intake tube and you got a ghetto DIY!

Jon
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Old 03-27-2005, 11:33 PM   #8
cabe
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You can just take the top half of the airbox completely off, then manipulate the bottom half to get it closer to your scoop. Then all you need is to plug the hole in the airbox where the air used to come in and get some little clamps to keep the filter in place.
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Old 03-27-2005, 11:44 PM   #9
keirnna
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The problem is you need a certain amout of tubing to ensure that when you first punch the throttle that there is air already past the filter for the engine.
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Old 03-27-2005, 11:51 PM   #10
cabe
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Ahhh. There's a post on here or i-club about this. Lemme take a looksie.
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Old 03-27-2005, 11:54 PM   #11
keirnna
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Yeah there is. I belive that I read it on RS25.com.
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Old 03-28-2005, 02:32 PM   #12
DragonRM
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Yeah... there's a few people that have done custom ram airs from the scoop around, and there's the gravelsports one which is pretty high quality parts wise. But not sure if it's more reliable or more durable than just a diy
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Old 03-28-2005, 02:47 PM   #13
cabe
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I don't think it's that great of an idea to begin with. I've seen some serious stuff laying on top my intercooler in my wrx. Lucky for me, it's not my air filter. I just don't think all that water, dust, debris, (birds LOL) would be good for your intake.
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Old 03-28-2005, 03:26 PM   #14
Merdock777
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Not really my fav diy design. I'm more a CAI fan than the SRA and homebrew ram air. I would worry at highway speeds in the rain, though it does take a fair bit. Also that is really close to the TB. If you are going all out HP then maybe but good luck driving around town w/ no torque.
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Old 03-28-2005, 03:26 PM   #15
down_for_the_scooby
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Ok, I'm in the midst of doing this myself, I got the idea from some one on this site with a pic, (search "intercooler on an rs"), I'll admit I tried to do it and it almost worked except the intake is not center, unlike the 2.0 turbo. But enough about me, as far as I can determine, if you take off all that crap leading up to intake except for where the actual filter inserts into and rig a box in the shape of a quarter circle to direct the air that will be coming in from your future scoop towards the air filter. Slap on some rubber gasket to make a tight fit from scoop to air box and stretch some fine screening over the box, (or on the underside of your hood at the scoop opening if you like), to keep all the nasties out, you should have a homemade ram air. Though I would recommend checkin' that filter every coupla weeks or so. Good luck.
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Old 03-28-2005, 03:29 PM   #16
down_for_the_scooby
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Quote:
Originally Posted by keirnna
The problem is you need a certain amout of tubing to ensure that when you first punch the throttle that there is air already past the filter for the engine.
I'm not sure I follow, the engine sucks the air in itself, ram air or no ram air.
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Old 03-28-2005, 03:48 PM   #17
Merdock777
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yup and if you don't have a reserve of filtered air you get poor low-end torque characteristics
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