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Old 02-20-2001, 04:54 PM   #1
RSer2580
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Member#: 4065
Join Date: Feb 2001
Location: IL
Question Just asking

Has anyone thought of just cutting into the back of the stock airbox, and making an easy to close plastic air guider from the hood scoop to the rear of the air intake box? This would be almost a direct path to the back of the air filter from where the air is normally sucked.

It would be a very inexpensive cold air setup for N/A cars. The only thing I'm not sure of is how to make the guider. I'm sure if I had to I would bet resort to sckotch tape and cardboard.

And howcome nobody has made a easy close mechanism for the hoodscoop. If those two were available, I'm sure the more expensive set-ups would become obsolite for the average MY00, N/A 2.5L RS.

The whole thing would most likely cost maybe $80 with filter. And it would easily compete with the more expensive coldair set-ups.

I don't know, just stiring up thought (trouble)hopping to make the subaru moding experience less costly.

This would also be a good idea for anyone in the intermediate stage before putting more $$$ into forced induction. I know I want something to make my car faster for now, but at the same time I don't want to regret throwing the damn thing out after I take the big step into turbo.
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Old 02-20-2001, 05:12 PM   #2
Jessie James
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Chapter/Region: MAIC
Location: Out of my mind
Post

One word: Rain.

What happens when it rains. I've been trying to figure a foolproof way to accomodate water into the intake, but nothing seems to be 100%. Because of the vacuum created by the engine, it'll always want to pull water (and bugs and rocks) into the filter. Hm.

I'm open for ideas, of course.

Mac
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Old 02-20-2001, 05:14 PM   #3
Jon Bogert
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Vehicle:
09 GTR, 02 996 C4S
95 993 C4, 71 911, 04 STI

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Check out: http://www.ozemail.com.au/~petermca/...ter/index.html

This fellow has a carbon fiber duct which funnels air better using the stock hood scoop. Could be the basis for an airbox... maybe...
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Old 02-20-2001, 07:13 PM   #4
Skirvdawg
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Member#: 3375
Join Date: Dec 2000
Location: Virginia Beach
Vehicle:
2002 VW Jetta Wagon
Black

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There would probably be a few problems arising out of that set up, and they all stem from the air path and vibration. The path of the air from the scoop to the airbox would be very turbulent due to changes in volume and surfaces as the air enters the scoop and into whatever kind of setup you had.

This vibration will probably result in an ungodly noise and vibration. In addition, turbulent air does not like to flow through the filter at a constant rate over the same area.

All this info is courtesy of my Navy pilot friend, so if anyone has contradictory info, let me know so I can rub it in his face.
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Old 02-20-2001, 09:26 PM   #5
RSer2580
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Lightbulb

McCavity,

I have already considered this factor, and that is the reason I wanted a design that could be very easy to close off.

Skirvdawg,

I have not considered that, but my design is different enough that it might work regardless. You see, the air will travel through to the back of the intake. I'm considering the air will continue its path until it hits the back of the air box. The outside air will ricochet off the back of the air box at a 45 degree angle, then hit the filter.

Run this by your friend and see what he says. Also, I don't think I'll be going as fast as a plane, hence less vibration..etc.

Don't know. Just tell me what you think guys.

Jon Bogert,

Thanks for the link. I sent them an e-mail concerning this topic and hopefully I will be able to set something up with them concerning this issue.

Thanks to all,

Rob
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Old 02-21-2001, 10:31 AM   #6
Skirvdawg
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Black

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It's not really the speed that causes the problems I mentioned. Speed just magnifies them. The real problem has to do with the different surfaces the air contacts which distort the flow of the air.

The best analogy I can think of is water going through a straw vs. water running over rocks in a river. The smooth intake is the straw and the open airbox idea is the whitewater.

I know someone else made this work, and if you can do the same, more power to you. I wouldn't be surprised to get more vibration from the set-up, though. As far as the overall volume of air actually going into the engine, I don't really think that will change.
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