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Old 02-21-2012, 11:29 AM   #1
79tranny
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Question Any legit NA intake info??

Just trying to do some research on the subject, I can't find any real answers on the things I search.

I have a RHD bugeye that I'm building a motor for now, I bought a large plenum, long runner intake manifold from a NA SOHC engine.

I can't find any legit information on what needs to be done to make this fit, some say drive by cable won't work, others say a/c won't work, and then some say custom fuel rails will be needed..

everyone talks that theyve done it already, but nobody really explains what specifically was needed to be done.. If anyone knows of any threads that do have the information I need than I'd appreciate it.

the manifold will be rotated regardless.

Thanks!
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Old 02-21-2012, 04:03 PM   #2
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Any info would be amazing.
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Old 02-22-2012, 12:34 PM   #3
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good luck- i haven't had any help from people in here. Once again, everyone's done it, no one will help. Lot of egos in the room.
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Old 02-22-2012, 01:04 PM   #4
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There are plenty of helpful people if you post in the correct forum. This is not a Subaru conversion - ie either using a Subaru powertrain in a different make vehicle

OR (& I don't like this one)

Using a Subaru drivetrain from another model.

This is neither. Post in the 2.0 sub-forum or the built motor forum for the best replies. Nobody in the conversion forum knows what you're talking about.
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Old 02-22-2012, 01:15 PM   #5
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Quote:
Originally Posted by DirtyHands
good luck- i haven't had any help from people in here. Once again, everyone's done it, no one will help. Lot of egos in the room.
You started threads yesterday so you're going to have to be patient. I've looked at your posts and you're asking something that I'm guessing very few people are familiar with. Just because help doesn't come as quickly as you'd like doesn't mean you should make assumptions about the people here. As long as you've done your due diligence in searching people are as helpful as they can be.
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Old 02-22-2012, 02:46 PM   #6
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Dremob I posted this in the 2.5liter p/t as well as the built motor discussion.

This thread wasn't posted in the conversion section.. the mods moved it for some reason, I agree it shouldn't be here and I don't think I'll find the answers I want with it being here but who knows.

I'm also aware I posted it a day ago.. I have no negative attitude towards the members on here, I've learned a lot from this forum and even did my entire right hand drive swap all by myself just from what I've read on here.
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Old 02-22-2012, 03:48 PM   #7
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is the NA intake manifold going on a turbo motor? I think that might be part of the confusion around here. If so, you can make an educated guess on using the cable tb by lining it up side by side with the stock bugeye manifold and measuring bracket location. I can't see AC being a problem unless a hardline is in the way of something.
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Old 02-22-2012, 04:50 PM   #8
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Sometimes you must just dive in and try it out. Trial and error. Thats what I did. (not directed towards you 79) I had alot of complications but in the end it was worth it. Funny thing now so many people are doing/trying it out. I've got alot of PMs about it in the past year or two.
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Old 02-22-2012, 05:07 PM   #9
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Trial and error is probably what I'll end up doing.. I was just trying to figure it out before I get into it. I'm still building the motor and saving up for some of it so I'm a ways away from worrying about this.. I just wanted to give myself a heads up.

And yes its going on a turbo motor
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Old 02-22-2012, 06:21 PM   #10
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Where in MA are you located?
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Old 02-22-2012, 07:19 PM   #11
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Quote:
Originally Posted by 79tranny
Dremob I posted this in the 2.5liter p/t as well as the built motor discussion.

This thread wasn't posted in the conversion section.. the mods moved it for some reason, I agree it shouldn't be here and I don't think I'll find the answers I want with it being here but who knows.

I'm also aware I posted it a day ago.. I have no negative attitude towards the members on here, I've learned a lot from this forum and even did my entire right hand drive swap all by myself just from what I've read on here.
No, the other guy who responded opened 3-4 thread asking the same question. It was that guy i was ripping on. It sucks that your thread got dumped here. Not all mods pay attention to what they're doing.
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Old 02-22-2012, 07:43 PM   #12
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I'm located in southern ma. In wareham and work in dartmouth
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Old 02-23-2012, 07:04 AM   #13
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OK shoot. Im in nothern MA.
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Old 02-23-2012, 07:29 AM   #14
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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 sure 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 spacer, 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 02-23-2012, 09:41 AM   #15
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Wow thanks! That's actually helps a lot. I'll be reversing it but not running avcs so I should tneed a manifold spacer.

I'm also using a kaminari reversed hood scoop cf hood.. do you think it will clear?
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Old 02-23-2012, 10:14 AM   #16
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Hi,

although I haven't tried it, I don't think reversing will work. The only person I've read about that has reversed it had to have the runners cut and re-welded. (assuming you're talking about the long runner one piece 2.5 NA manifold)

Also I have a kaminari reverse hood, and just from eyeballing it, I can't see how it would work either
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Old 02-23-2012, 02:49 PM   #17
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Damn. I was really hoping to reverse it. Not a big deal I guess.. changes my mind about polishing it now lol I appreciate your input
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Old 02-23-2012, 03:04 PM   #18
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Polished manifolds look great! I will have my 2.5i manifold polished by the same guy that did my STi manifold.
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Old 02-23-2012, 06:45 PM   #19
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Hmm.. that does look good. I've been doing mine by myself and its coming out okay. Maybe I will still do it. How much did it cost you to have someone do it?
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Old 02-23-2012, 07:01 PM   #20
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Id love to get mine polished, yummmmm.
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Old 02-23-2012, 08:49 PM   #21
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2.5rsti... is your manifold rotated? Just curious.

There's a member called quadsbc on here who is rhd like me and has the same hood.. he commented on my build thread and said he's got the same mani and its also rotated..
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Old 02-23-2012, 09:26 PM   #22
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I have the 2.5 long runner manifold reversed on my car. I have it on 3mm spacers. In order to fit under my stock hood, we had to mount the throttle body upside down due to the top of the iacv valve hitting the hood. I needed custom spacers made to use my aftermarket top feed fuel rails. A throttle bracket was made to use a dbc throttle body.
The a/c had to come out, because the alternator was flipped to where the a/c compressor was. And then using an idler pulley we fabbed a bracket for the alternator belt. There is a pic of my setup in the custom fabrication section under intake manifolds powdercoated/painted.
From knowing what we did on my car i dont think you will able to reverse it under a kaminari hood.
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Old 02-24-2012, 08:25 AM   #23
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Guess I'll just have to do a little trial and error with it then. I'm ok with it if I can't rotate it.. but it would have been nice. Some great and very helpful info here thank you!
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Old 02-24-2012, 09:09 AM   #24
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Quote:
Originally Posted by 79tranny View Post
Hmm.. that does look good. I've been doing mine by myself and its coming out okay. Maybe I will still do it. How much did it cost you to have someone do it?
I am friends with a guy that owns a metal polishing business. He sponsors my car, and cuts me good deals. not sure how much it would be full price. probably 3-400 ish. the work is top notch though.

He did my TGV's also


He has some serious polishing equipment!
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Old 02-24-2012, 12:55 PM   #25
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Wow! I don't think I'll get mine to look that good. I might have to look into that
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