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#45° air box with velocity stack questions

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 Post subject: 45° air box with velocity stack questions
PostPosted: Thu Apr 24, 2014 8:27 pm 
First Gear
Joined: Wed Feb 27, 2013 6:22 am
Posts: 177
Location: PDX
I've looked through most of the threads on the airbox mod.
But i have a couple questions for my set up.

First.

I'd like to know if leaving this white piece in the bottom part of the box is beneficial? (With or without the velocity stack)

Image

Second.

I'm installing a velocity stack here.

Image

And,.

The velocity stack I have is 2&3/4" ID.
The size of the hole in the box is 3&1/2" dia..(pictures below).

So I'm wondering, if putting the velocity stack on. will actually have a negative effect on what im tryin to accomplish with the bigger intake hole.

I was also thinking if I install the stack and the extra inlet elbow, (as Josh did on his..)
would that provide saficient airflow, With the smaller diameter stack?

Image
Image.

I am also going to install the golden metal velocity stack right before the maf..So ill be flowing real smoothly..

Any thoughts that could help me or answers would be great. Thanks in advance.

Sent from my SCH-I545 using Tapatalk

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92 SS winestone red. td04 - FMIC. RWD 5 spd swap/LSD.dead...
94 LEGACY GT RAISED ROOF WAGON, fozzy lift hydro clutch/91SS 5speed/VLSD..#5.NEW FuLL DRiFT SLuT 93SS winestone,RS 5speed RWD. Welded rear, td04, fmic, 17x9 +20


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 Post subject: Re: 45° air box with velocity stack questions
PostPosted: Thu Apr 24, 2014 11:43 pm 
Site Admin
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Joined: Tue Oct 15, 2002 11:37 am
Posts: 27058
Location: Houston, Tx
I don't know if leaving the white plastic piece on will help or not.

Regarding the velocity stack....if the opening is larger than the velocity stack it may be more of a hinderance. Creating a second inlet like I have may help, but I still think keeping the inlet holes as large as possible would be the best. Any chance you can find a larger velocity stack.

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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: 45° air box with velocity stack questions
PostPosted: Fri Apr 25, 2014 2:27 am 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 722
Location: Parkville, Mo.
A place that does metal spinning could custom make you a velocity stack that would be the right size. The volvo piece that I used isn't perfect, but it is plenty big enough. The only real downside to it is the homemade lip. It would flow better with a really good radius at the opening.

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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: 45° air box with velocity stack questions
PostPosted: Sat Apr 26, 2014 6:06 am 
First Gear
Joined: Wed Feb 27, 2013 6:22 am
Posts: 177
Location: PDX
I am gonna ditch the velocity stack for now. The box won't fit with it. I did put the metal one before the maf tho. I'm planning on leaving the white piece cuz I'm sure it serves a purpose maybe like direct the air in a way it won't make the air as turbulent

Sent from my SCH-I545 using Tapatalk

_________________
92 SS winestone red. td04 - FMIC. RWD 5 spd swap/LSD.dead...
94 LEGACY GT RAISED ROOF WAGON, fozzy lift hydro clutch/91SS 5speed/VLSD..#5.NEW FuLL DRiFT SLuT 93SS winestone,RS 5speed RWD. Welded rear, td04, fmic, 17x9 +20


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 Post subject: Re: 45° air box with velocity stack questions
PostPosted: Sat Apr 26, 2014 3:29 pm 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 722
Location: Parkville, Mo.
To get it to fit you will need to remove the inner fender and install it from the outside. That's the way I had to do mine.

_________________
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: 45° air box with velocity stack questions
PostPosted: Wed Jul 30, 2014 9:23 pm 
First Gear
Joined: Sat Jan 11, 2014 6:31 am
Posts: 187
Location: Albuquerque, NM
Funny, my airbox doesn't have one of those white parts.

Does it help with airflow?

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- '93 Metallic Blue Legacy L, DD w/lots of mods
- '91 Mazda Miata, Autox fun car


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 Post subject: Re: 45° air box with velocity stack questions
PostPosted: Mon Jan 26, 2015 12:41 am 
Third Gear
Joined: Sat Dec 16, 2006 4:41 am
Posts: 722
Location: Parkville, Mo.
I'm with you on that. I have never seen one.

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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: 45° air box with velocity stack questions
PostPosted: Mon Feb 02, 2015 8:23 pm 
First Gear
Joined: Fri Dec 19, 2014 8:39 am
Posts: 121
Location: Akron, OH
It looks like he's using a new gen air box. The earlier ones didn't have spring clips holding the two halves together.

I've seen them in the newer boxes, but I think it's meant more to keep any incidental crap from being sucked up against the air filter (in case leaves or what not get past the snorkus).

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1991 Legacy SS (BC) EJ22T // 4EAT // Pewter Metallic (Sold)
1991 Legacy SS (BC) EJ22T // 5MT // Rio Red (Sold)

1991 Legacy SSRS (BC) EJ20G (Full COP and AWIC Swap) // 5MT // White Pearl Tri-Coat Africa Rally replica in progress.


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