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Old 09-22-2010, 07:49 PM   #1
legacy_jm
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Default '98 Legacy duct in air dam

I recently purchased a 1998 subaru legacy. the previous owner told me he had done some custom modifications. I said ok and bought it. the next day i discovered an air duct going from the front air dam to my air box.

I was wondering if i should get rid of it or let my engine enjoy the cool air
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Old 09-22-2010, 10:17 PM   #2
Frogsthatmoo
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Pictures?
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Old 09-23-2010, 12:09 AM   #3
Jonathan
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I would be worried about the potential for massive quantities of water getting sucked in to the air intake and the possibility for this to result in a hydro-lock condition. (Air compresses easily, but water is very difficult to compress.. attempting to compress water in most internal combustion motors can result in the motor suddenly seizing and lots of internal engine components getting bent as a result of hydro-lock).

A photo of the duct in the air dam might help.
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Old 09-23-2010, 05:29 PM   #4
legacy_jm
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I understand the hydrolock problem and thats y i moved it up and back, but i was just saying would it be better back in the headlights like stock or grille maybe. I like the throttle response from it though. i press the gas and in goes air like a vacuum. I actually clean my throttle body last week just for the extra sound and feel.
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Old 09-23-2010, 05:46 PM   #5
legacy_jm
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Old 09-23-2010, 05:48 PM   #6
legacy_jm
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wrong one
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Old 09-23-2010, 05:48 PM   #7
legacy_jm
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how are pictures posted
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Old 09-23-2010, 07:39 PM   #8
Frogsthatmoo
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There is a common DIY mod for my dad's car (Volvo V70R) is a very very similar duct type intake that is run behind the foglight grill and into the intake. There's some people on the forum (swedespeed) that have been running this mod for almost 30,000 miles or more. As long as you don't go charging at puddles, I think you might be fine.

Host the pictures somewhere like flickr or similar.

Last edited by Frogsthatmoo; 09-26-2010 at 03:39 PM.
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Old 09-26-2010, 02:39 PM   #9
GeneralDisorder
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Generally speaking - Subaru's already have CIA's because of the location of the factory snorkel inside the wheel well or above the grill - which pulls cold air from outside the engine bay in either case.

So is it a worthwhile mod? No.

Was the PO clearly mis-informed and unskilled? Yes.

Is there also, in addition to being completely useless, the possibility that you could cause severe internal engine damage? Yes.

Your call......

GD
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Old 09-27-2010, 11:37 AM   #10
jey
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You won't notice any difference in throttle response by returning the intake back to a more stock configuration.
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