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Old 06-28-2002, 06:20 PM   #1
Scooby Guru
Member#: 15543
Join Date: Feb 2002
Location: san francisco, ca
90BJ Legacy LS ABS
AWD 946 Rio Red Jpn built

Default Cheap, easy, reversable Cold Air Intake mod :)

So Ive been running my legacy this way for a while and Im happy.

Bypass the coolant hose that "prevents ice from forming on the throttle plate." (subarus words).

The normal flow is from the outlet on the coolant, through the IAC then through the throttle body and back into the cooling system if I remember right. I just bought a peice of metal fuel line from kragen and cut it to the right length so it was easy to replace if it didnt work.

Check it out. Very easy cheap and I KNOW it must make a difference. I guess I could do some sort of write up on this, but its so damn easy you should know what I mean!

If you have trouble, look on the housing that holds the throttle plate (peice between gasket on runners and the plastic intake hose). On the bottom left and right side there are small heater hose's connected to 3/8 inch brass fittings. Get a peice of metal pipe say 5 inches long to take the place of the throttle body. So now instead of the hoses running through the throttle they go around.

Im pretty sure the paper gasket works as a decent heat sheild from the engine so this is one less source of heat for the air, especially since it is heating the throttle plate which has a decent surface area.

Edit: Oh and I havent had any Ice form yet
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Last edited by ciper; 06-28-2002 at 07:12 PM.
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Old 06-28-2002, 09:10 PM   #2
Patrick Olsen
NASIOC Supporter
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
1997 Legacy 2.5GT
QuickSilver Metallic


I'm sure it makes a difference, but I doubt it's anything anybody would ever notice by the ol' seat of the pants dyno. This is a pretty popular "modification" with the 5.0L Mustang crowd (which has the exact same type of setup), but chassis dyno results show essentially zero gain.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 06-28-2002, 09:27 PM   #3
Scooby Guru
Member#: 15543
Join Date: Feb 2002
Location: san francisco, ca
90BJ Legacy LS ABS
AWD 946 Rio Red Jpn built


I just realized, I left something out!

The reason I first thought of this mod was when I had a small leak in one of those hoses. I replaced it with standard heater hose (not the special subaru bent type)

So to make this mod EASIER, use ONE piece of 5/16 hose that is about 12-13 inches long.

I just went to pep boys to replace mine with this, only 80cents Cheaper than getting a metal line. Id also suggest some real hose clamps but thats up to you.
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