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Old 02-20-2012, 01:06 PM   #1
79tranny
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Default using an NA intake manifold.. what rails to use?

Hey guys, not sure if I should post in the factory 2.5l powertrain or here.. but since the motor is built I will start here..

I have a 2.5I intake manifold that is going to be used on my engine.. it will feature a custom mounted rotated turbo and the intake will also be rotated.

I search and couldn't find an answer but I remember reading somewhere someone saying you need special fuel rails to use this intake..

Does anyone haved any idea? I don't have injectors yet but I will most likely going with 950cc or bigger.

And info is appreciated!
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Old 02-20-2012, 05:12 PM   #2
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Anyone?
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Old 02-20-2012, 07:28 PM   #3
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Im running aeromotive and had adapters custom made to run it.
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Old 02-20-2012, 07:31 PM   #4
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What were the adapters made for? Just to mount it?
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Old 02-20-2012, 07:54 PM   #5
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yes..
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Old 02-20-2012, 10:23 PM   #6
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Ok thanks for the info man I appreciate it. I wasn't sure what the issue would be with the rails
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Old 02-21-2012, 11:25 AM   #7
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Are custom spacers needed, or do the bolt holes not line up correctly and custom brackets requred?

I am upgrading to the 2.5I long runner this spring as well.
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Old 02-21-2012, 11:33 AM   #8
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I just made another thread in the 2.5 turbo p/t section too... hoping to find more information on the entire swap and what needs to be done since I can't really find any full information on it
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Old 02-22-2012, 01:19 AM   #9
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I have the same intake I sent it to outfront motorsports to have it polished and I sent my injectors with it they made fuel rails and the mounts for it
It fits great!!
It is a little tight with my rotated turbo but if I take out the 8mm spacers and put in 2 mm it will have plenty room
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Old 02-23-2012, 07:41 AM   #10
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I will cut and past from my other post in the other forum:

Ok, I'll take a stab at this since I've done this, and have found ALL the info on various searches through Nasioc, but I'll condense it here.

2.5i intake manifold - there are three types - most have only dealt with two of them - they are
1) Long Runner - metal
2) Short Runner - metal - this is the best one to get - you will see why below
3) Plastic

I'm not gonna bother to say which year model of legacy, impreza, etc used which of the above three types since - that can be easily searched and found and I don't feel like going through all the model years and such

Type 1) long runner - metal -
A) to use a drive by cable car - i.e 02-05 WRX - 16bit ecu etc
A1) will need custom fuel rail spacer, most topfeed wrx fuel rails will not work - the only fuel rails that will work without any work are those that came with the manifold to begin with - No vendor that I know of makes a set of spacers, you are on your own to measure and fabricate
A2) Throttle body - will not work - have to have an adapter welded to the it make the IACV work - what I would use is the spacer that OBX sells on ebay 50 bucks - look up throttle body spacer, OBX on ebay, you can't miss it
A3) Throttle cable - Will not work - have to fabricate a bracket or have something welded to the manifold to have it hold the cruise and throttle cable
B) to use on Drive by Wire car - i.e 04+ STI etc
B1) same as A1 - need custom
B2) will work if you use smaller bolts, can't remember the size, but it should bolt up
B3) Not an issue, since no cable

Type 2) short runner Metal - this means you will need TGV from your old car - I know that topfeed WRX tgvs will work - BUT! you have to slot the bolt holes on the 2.5i manifold to make it work - and I mean a lot of enlarging and slotting
A) Drive by Cable
A1) - fuel rail - not an issue - since it uses WRX TGV, uses any topfeed fuel rail
A2) - Throttle body - same issues as long runner - weld, need spacer etc
A3) - Throttle cable - same issues as long runner - weld, make bracket etc
B) Drive by Wire
B1) - Fuel rail - not an issue - since it used your WRX TGV
B2) - Throttle body - not an issue - just use correct sized bolts
B3) - Throttle cable - not an issue - since no cable

Type 3) - plastic Upper type - I'm not gonna even bother, everything from above should be clear AND its plastic, you can't weld... so unless you're using it on an STI/Drive by Wire - I wouldn't bother

Final Notes
- yes there also other random issues, like clearing AVCS solenoids, you will probably need a intake manifold spacer, like the ones KSTECH sells - get the tallest one possible - this is for Long Runner
- if you want to reverse it - probably won't fit your hood

Oh and if your wondering - I used a short runner version on my 2005 wrx - so I had all the welding and other stuff done - also that manifold with TGVs and fuel rails will be up for sale in the next month. I have something infinity more badass coming in the mail

Hope this helps
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Old 02-24-2012, 09:49 AM   #11
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We are working with someone here in CO that will be producing a rail kit that is direct bolt on.
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Old 02-24-2012, 09:54 AM   #12
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Quote:
Originally Posted by ASF Machine View Post
We are working with someone here in CO that will be producing a rail kit that is direct bolt on.
Will you sell the adapters only? I already have complete rails and lines, just need the adapters.
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Old 02-24-2012, 09:59 AM   #13
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These rails don't use an adapter.
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Old 02-24-2012, 10:01 AM   #14
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Will they work with -6 an lines?
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Old 02-24-2012, 10:14 AM   #15
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Quote:
Originally Posted by cnstman View Post
Will they work with -6 an lines?
With the supplied -6 to -8 ORB fitting into the rail, yes.
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Old 02-24-2012, 11:48 AM   #16
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Old 02-24-2012, 12:56 PM   #17
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Asf.. how long are you looking to have these out?
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Old 02-24-2012, 01:02 PM   #18
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Quote:
Originally Posted by wrxadam05
I'm checking the site out.. were they a direct bolt on to say a long runner big plenum NA intake?
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Old 02-24-2012, 01:12 PM   #19
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Yes, it was a direct fit. That is why I used them with the same intake manifold you are asking about right now lol.
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Old 02-24-2012, 01:19 PM   #20
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Sweet! Thanks man. Saves me a huge headache
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Old 02-24-2012, 04:12 PM   #21
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Stock WRX rails work with ~.5" spacer plate if you are cheep DIY kinda person. From my install.




And no welding required for a spacer plate for 16 bit ecu, you can just slot the throttle body like I did.

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Old 02-24-2012, 04:25 PM   #22
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I'm not against the spacer plate for the stock rails. But I don't think wrx rails will be enough for my motor build and the turbo I'll be using..

By "slotting" the throttle body, what do you mean exactly? Only reason I ask is because I take it as making the holes into slots such as more oval shaped than a circle.. and I don't see that in your pic of the TB
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Old 02-24-2012, 06:44 PM   #23
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Soon tranny.
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Old 02-25-2012, 08:33 PM   #24
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Quote:
Originally Posted by 79tranny View Post
I'm not against the spacer plate for the stock rails. But I don't think wrx rails will be enough for my motor build and the turbo I'll be using..

By "slotting" the throttle body, what do you mean exactly? Only reason I ask is because I take it as making the holes into slots such as more oval shaped than a circle.. and I don't see that in your pic of the TB
Ya I am having issues with the stock rails and 1400cc injectors, those aftermarket rails above look really nice. One issue is that aftermarket injectors can vary in length so you might have to shim or trim the rails.

See the cut above the butterfly valve, that is where the IACV lets air into the engine and that is what I slotted it saves having to mod the manifold for a IACV air inlet. If you use 6mm bolts like the RS manifold has threads for you dont need to modify the bolt holes, they prefectly locate the TB even though they are smaller than the 8mm holes. Give it a shot.

Last edited by lukeskywrx; 02-25-2012 at 08:39 PM.
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Old 02-26-2012, 12:40 PM   #25
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Awesome this thread is going to be like my bible very soon when I'm actually tackling this! Thanks a lot!
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