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Old 04-22-2004, 07:01 PM   #1
impr25rs
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Default Intake Manifold

The intake manifold on the newer RS, 02-04, possibly earlier models top, it is a plasitc composite or something to that nature. I was suprised and thinking what the heck was Subaru thinking . There probably is a reason for it that I don't know about. But anyway, I want to turbo my car in about 2 years and I was wondering what you older subi RS do? Do you switch out the manifold for a WRX or have a fabricated one that will have all the sensors and components? I know that the manifold is kinda crappie with anything above 250 hp. Detailed info would be most appreciated. Thanks
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Old 04-22-2004, 07:08 PM   #2
03rsturbo
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I'm not quiet sure what you are talking about but I have a 03 rs turbo and I can assure you of one thing, the intake manifold is aluminium and can handle far more psi then the rest of the block
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Old 04-22-2004, 07:22 PM   #3
impr25rs
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That was a quick reply. Thanks. I am serious. It is not a metal intake manifold. I swear it is a plastic composite or something. Maybe it is aluminum with a plastic coating or something. I have another question. If I get borla headers (or something beter) will an upipe bolt on with a WRX crossmember?
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Old 04-22-2004, 09:33 PM   #4
Matt Monson
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Didn't I already answer this manifold question on WRXforum? I guess I am not a very trusted source on such things.

As for the Borla headers; if you use them, you will want an uppipe designed for an RS-T, and to forget about the crossmember, especially since a stock up-pipe will hit your SOHC heads anyways...
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Old 04-22-2004, 10:47 PM   #5
Aphex
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I've certainly never heard any such info about the intake manifold, I've never seen anybody complain about the intake manifold. and it most certainly is not plastic.

the only issues people have is if they try to fit a wrx intercooler to the manifold, it tends to be a little tight in the firewall area, but nothing beyond that.
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Old 04-22-2004, 10:51 PM   #6
Matt Monson
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The composite manifold is on all of the '04 EJ25's. A search in the NA forum will answer any other questions for all of you...
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Old 04-22-2004, 10:55 PM   #7
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Your manifold is plastic. It's also lighter, doesn't soak up heat as much and flows a little better than the previous version. You can swap out to an aluminum manifold from a SOHC EJ2.5 if you want to make sure you don't run into troubles from turbo heat.

Some savvy N/A folks may want to swap with you to reap the bennies for autocross.

Ask zzyzx about the differences and how well they work.

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Old 04-23-2004, 12:36 AM   #8
phattyduck
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A plastic manifold wouldn't be bad for a turbo. (I've personally seen at least 15lbs on a Toyota plastic manifold) If you tested it, I bet it would hold 50-100psi just fine. Also, bet that manifold will stand up just fine to heat. As long as the throttle body is in the same place as it has been in previous years, just go for it and don't worry about it.

-Charlie
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Old 04-23-2004, 01:20 AM   #9
Kostamojen
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For a turbo kit, I would make sure the turbo is strongly supported and not hanging off the intake manifold in any way shape or form. Otherwise, from what I hear, should be fine for turboing. Alot of the new JDM turbo engines have the plastic intake manifolds.
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Old 04-23-2004, 01:54 AM   #10
HOK
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Is it just me but do plastic manifolds sound .... like subaru cheapen yet again...

i'm still in shock that its plastic...
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Old 04-23-2004, 02:41 AM   #11
phattyduck
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Quote:
Originally posted by HOK
Is it just me but do plastic manifolds sound .... like subaru cheapen yet again...

i'm still in shock that its plastic...
Hmmm... lets see: Its lighter, easier to form, conducts less heat, faster to make, cheaper... what's wrong with plastic? I thought it was weird at first... but it seems like a fine idea to me.

-Charlie
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Old 04-23-2004, 02:43 AM   #12
White 2.5rs
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hey man if u wanna trade me for my metal one ill gladly do it
lemme know
alex
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Old 04-23-2004, 02:47 AM   #13
HOK
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WHAT is going on???

you guys want plastic turbo housings too? maybe i'm just too old school...

now a CF intake mani... hehe
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Old 04-23-2004, 02:05 PM   #14
impr25rs
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Hey Matt, I didn't mean anything by asking the question here. I value all the input I get and I do believe what you say. You told me to come here and ask the question to get more info. Sorry man. Anyway, I guess I will have to think about the manifold. I may stick with it or not. I was just suprised by this and wondered if any other models had this or if it was new. And new it is. Thanks for the input I will take up some consideration. White 2.5rs will think about it. Thanks guys
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Old 04-23-2004, 02:25 PM   #15
Matt Monson
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impr25rs,
My short term memory isn't what it used to be. I was just giving you some shizy, but had completely forgotten that I actually suggested you come over here and inquire some more.

And I still have that STi manifold if you are interested...
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Old 04-25-2004, 01:38 PM   #16
LVSUBARU
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Quote:
Originally posted by HOK
Is it just me but do plastic manifolds sound .... like subaru cheapen yet again...

i'm still in shock that its plastic...
It probbaly cost Subaru alot more money to develope a plastic manifold rather than keep using the aluminum one.
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Old 04-25-2004, 01:42 PM   #17
HOK
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thats debatable...

Does the STI have this plastic intake manidold? If not then i would question the benefits and cost that you guys mention...
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Old 04-26-2004, 03:09 PM   #18
Storm
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...and in SOA's eyes, the intended use between an STi and say, an Outback would be a little different, no? Low production volume, 14psi and marketed hi performance abilities versus high production, everyday use by Jane Q. Public......

Quote:
Originally posted by HOK
thats debatable...

Does the STI have this plastic intake manidold? If not then i would question the benefits and cost that you guys mention...
Jay Storm
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Old 04-26-2004, 03:33 PM   #19
HOK
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Quote:
Originally posted by Storm
...and in SOA's eyes, the intended use between an STi and say, an Outback would be a little different, no? Low production volume, 14psi and marketed hi performance abilities versus high production, everyday use by Jane Q. Public......
i don't get what your trying to say here?

i'm trying to say that if this intake manifold was better and is more expensive, why would they not put it in the STI or WRX.
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Old 04-26-2004, 05:21 PM   #20
jeff22
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as for the "older" cars the intake isn't bad! if you want some sick HP numbers the intake isn't going to help that much. you can get the intake extrude honed but your better off just port matching everything. but your best dollar for dollar hp is getting the heads ported and polished! Jeff
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