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 Post subject: If you are still running the stock airbox,
PostPosted: Fri Feb 21, 2014 4:48 am 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 722
Location: Parkville, Mo.
you might think about putting the 45 degree box on. I picked up a bunch of car magazines that were free on craigslist and most were from the 90's. There was a Street Power magazine from 97 that had a hop up article on a 90 300zx twin turbo. The part that caught my attention was replacing the stock air box which has the same setup as the airbox on our cars. The inlet to the maf is in a corner with the wall very close and it is hard for the air to travel up and make that tight turn into the maf. They were seeing an 18 horse increase by getting rid of the stock box which is a huge restriction. Why Subaru put the shrouded airbox on the turbo cars and the 45 degree box on na cars beats me. I would think the 45 degree box should be worth at least 10 horses on our cars going by their results. The guy that was doing these kits was Jim Wolf technologies who I have no idea if he is still in business, but when I saw the pictures of the airbox I said that looks really familiar.

Jeff

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Fri Feb 21, 2014 6:02 am 
Fifth Gear
Joined: Mon Nov 06, 2006 3:41 am
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Location: Tenino, WA
Pics?

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Fri Feb 21, 2014 6:49 am 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
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Location: N. ID
Hi,
THIS ARTICLE has some related info on the restrictions in the intake..... the main restriction is the snorkus.

And HERE'S MINE on my previous '90 Legacy w/the turbo swap.

I've not come up w/a decent coffee-cup mod for my '93 SS...yet.
Td

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'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
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'96 BD - turbo'd-SOLD


Last edited by wtdash on Fri Feb 21, 2014 5:20 pm, edited 1 time in total.

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Fri Feb 21, 2014 4:12 pm 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
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Location: Parkville, Mo.
That article is where I got the idea. I wish they had gone on and tested the airbox. It would have been good to have some cold hard facts, but all you have to do is look at the two and you will see that the 45 degree one is able to flow much more air because the maf entrance is not shrouded by the walls of the box and the air doesn't have to make two 90 degree turns.

Jeff

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91 Black SS 5spd. Edm lights, wrx gauges in dash, 45 degree airbox, cryoed drilled and slotted brakes. Invidia divorced downpipe with custom stainless exhaust. To be installed, aluminum a-arms, manual belts, awic.


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Sun Feb 23, 2014 4:02 pm 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
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Location: Parkville, Mo.
Josh hosted some pictures of my airbox setup. If you search for 45 degree airbox you should come up with the threads with the pictures. Wish I was better at this computer stuff so I could link it here.

Jeff

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91 Black SS 5spd. Edm lights, wrx gauges in dash, 45 degree airbox, cryoed drilled and slotted brakes. Invidia divorced downpipe with custom stainless exhaust. To be installed, aluminum a-arms, manual belts, awic.


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Sun Feb 23, 2014 6:19 pm 
Fourth Gear
Joined: Sun Jun 10, 2007 4:35 am
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Heres Jeffs old post: viewtopic.php?t=32768&highlight=velocity+stack

If I build another turbo Legacy, it will likely get a 45* air box rather than the Apexi Power Intake I have now.

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Sun Feb 23, 2014 11:40 pm 
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I'd be curious to see what changing to the 45 deg airbox does for the pressure drop. I've thought about the way the airbox is shaped and I question whether Subaru did it intentionally to create an area of low pressure just before the MAF to possibly help the air flow more evenly through the MAF. That may just be a hair brain idea though....

I converted to the 45 degree airbox as well and am running a custom made intake pipe. It's kind of a bitch to remove the airbox/intake pipe, but works well.

http://www.main.experiencetherave.com/s ... install/10
http://www.main.experiencetherave.com/s ... install/13

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Sun Feb 23, 2014 11:55 pm 
Fifth Gear
Joined: Fri May 04, 2007 4:09 pm
Posts: 2212
Location: N. ID
Josh,
In this pic I circled what looks like an 'extra' hose to the airbox. Or what is it, plz?

Thanks

Image

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Turbo Subies:
'87 GL-10 Turbo 4WD Wagon (pre-Loyale) - SOLD
'90 BJ, EJ22T/DOHC and 5-speed swap - SOLD
'04 FXT, Forged internals, VF39, STI TMIC, Cobb AP- SOLD
'93 Legacy SS - 5-speed, SOLD :-(
'02 WRX GG-SOLD
'96 BD - turbo'd-SOLD


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 12:06 am 
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Yes, that is an extra inlet "feeder" pipe to the bottom side of the airbox. I don't know if it really makes a difference, but I had added it probably around 2002 and decided to leave it there when I changed air boxes.

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 12:17 am 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
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Location: Parkville, Mo.
That is the one downside to this setup in that there isn't enough give in the system to take things apart easily. If I would start at the rubber elbow where it connects to the turbo I think it would be much easier. I always start in the middle and end up fighting things.

Jeff

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91 Black SS 5spd. Edm lights, wrx gauges in dash, 45 degree airbox, cryoed drilled and slotted brakes. Invidia divorced downpipe with custom stainless exhaust. To be installed, aluminum a-arms, manual belts, awic.


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 12:25 am 
Fifth Gear
Joined: Mon Nov 06, 2006 3:41 am
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Location: Tenino, WA
I'm running a different 45 degree box for under the intake routing. Could probably benefit from widening the hole in the box and fender wall. Mine is hard to remove/install as well.

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"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 12:57 am 
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The one thing I didn't really do is widen the hole that protrudes in the fender. They talk about it in the autospeed article....it's essentially creating a velocity stack to improve air flow.

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 1:54 am 
Fifth Gear
Joined: Mon Nov 06, 2006 3:41 am
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Location: Tenino, WA
So...the small hole is GOOD?

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"Your testes are close to your bottom but you still play with them all the time." Jeremy Clarkson


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 3:19 am 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
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Location: Lakewood, Wa 98439
You should install one of those electric turbos in the fender and duct it all up. BOOM!

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 4:12 am 
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kimokalihi wrote:
So...the small hole is GOOD?


No, but it makes your intake "hose" look bigger ;-)

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Mon Feb 24, 2014 10:40 pm 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 722
Location: Parkville, Mo.
Another thing I did to improve the flow was to use a thin wall tube on the inside of the 90 degree rubber connector on top the turbo. The sleeve is on the inside of the ribs so they can still flex, but now they don't impair the flow of air. There is a lip that keeps the thing in place.

Jeff

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91 Black SS 5spd. Edm lights, wrx gauges in dash, 45 degree airbox, cryoed drilled and slotted brakes. Invidia divorced downpipe with custom stainless exhaust. To be installed, aluminum a-arms, manual belts, awic.


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Thu Feb 27, 2014 6:45 pm 
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Jeff,

That's a really good idea! Do you have any pictures of that?

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Fri Feb 28, 2014 2:50 am 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 722
Location: Parkville, Mo.
I don't have any pictures of it. It was easy to measure for the length and od. The lip is at 90 degrees so it is shaped kind of like a top hat and it rests on the edge right before the ribs. I had a metal spinning shop do it for me. My only concern is if the thing digs into the rubber when things are flexing. Everything looked fine the last time I checked.

Jeff

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91 Black SS 5spd. Edm lights, wrx gauges in dash, 45 degree airbox, cryoed drilled and slotted brakes. Invidia divorced downpipe with custom stainless exhaust. To be installed, aluminum a-arms, manual belts, awic.


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Fri Feb 28, 2014 6:23 pm 
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If you have an opportunity to take a picture of it when you're doing some work, I'd love to see it.

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Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Fri Feb 28, 2014 11:15 pm 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
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Location: Parkville, Mo.
I will get you one when I can.

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91 Black SS 5spd. Edm lights, wrx gauges in dash, 45 degree airbox, cryoed drilled and slotted brakes. Invidia divorced downpipe with custom stainless exhaust. To be installed, aluminum a-arms, manual belts, awic.


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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Sat Apr 12, 2014 7:59 pm 
First Gear
Joined: Wed Feb 27, 2013 6:22 am
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Have you had an opportunity to get a picture of the sleeved 90°?

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 Post subject: Re: If you are still running the stock airbox,
PostPosted: Sun Apr 13, 2014 1:52 am 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 722
Location: Parkville, Mo.
No I haven't even been doing anything to the car. Thanks for reminding me about it.

Jeff

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91 Black SS 5spd. Edm lights, wrx gauges in dash, 45 degree airbox, cryoed drilled and slotted brakes. Invidia divorced downpipe with custom stainless exhaust. To be installed, aluminum a-arms, manual belts, awic.


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