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Old 06-26-2009, 10:53 PM   #1
bburd88
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Default wrx turbo onto a 2007 2.5i

my buddy who tunes subaru's is going to help me put on a wrx turbo onto 07 2.5i running like 5-8 psi. we r pretty sure i need a sti or wrx intake manifold and possibly throttle body to put onto my engine. i'm getting a sti downpipe and uppipe and i already have the mid and axle back. then i also need a tmic and other stuff that will help me with. but my main concern is the intake manifold. any suggestions and/or ideas?
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Old 06-27-2009, 12:06 AM   #2
Weasel Soup
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Not an expert here, but I think they are the same. Run a search perhaps?
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Old 06-27-2009, 12:45 AM   #3
william_c
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Intake manifolds are not the same. The WRX has longer runners which also allows the turbo intake plumbing to fit under the runner.

I don't think you need a wrx intake manifold, just make some custom intake plumbing.

Throttle body? Through my brief research I don't recall hearing anyone switch those out.

You need wrx/sti headers or you'll have no way to route your exhaust to the up pipe.

You may need to cut/notch your k-member to make the up-pipe fit. That or make/bend a custom up pipe.

Other than that you need some good engine management and something to prevent knock and retard timing like a j&s safeguard.

Good luck, there are 10,000 other threads you can look at for more info.
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Old 06-27-2009, 06:30 PM   #4
midnight2.5rs-t
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he has the choice of open tuning with the 07. no need to change intake manifold as i have seen alot more guys with wrx's and sti's swtich to the 2.5i mani(on bigger builds) i have heard it flows alot better than the wrx due to the way the runners are set up. i would suggest notching your cross memeber and getting wrx up and down pipes and rotating the pipes just a bit to clear you intake manifold so your not 90 degreeing the the turbo inlet so it flows alot better. look around for injectors that is a must if you go for boost. then what ever questions you have could find here with a little searching its there.
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Old 06-28-2009, 02:09 AM   #5
bburd88
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thanks midnight, i appreciate the helpful info.
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Old 07-13-2009, 03:14 AM   #6
Spudchucker
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Quote:
Originally Posted by midnight2.5rs-t View Post
he has the choice of open tuning with the 07. no need to change intake manifold as i have seen alot more guys with wrx's and sti's swtich to the 2.5i mani(on bigger builds) i have heard it flows alot better than the wrx due to the way the runners are set up. i would suggest notching your cross memeber and getting wrx up and down pipes and rotating the pipes just a bit to clear you intake manifold so your not 90 degreeing the the turbo inlet so it flows alot better. look around for injectors that is a must if you go for boost. then what ever questions you have could find here with a little searching its there.
I would definitely suggest open source tuning.. Get a $20 VAG COM cable on ebay, then downloaded ROMRaider and start reading up. Just like that, you have a very complete tune (if you are decent on the uptake..) and it only costed you pocket change and some time

As for the injectors, they can be modified. I have an 06 and mine ended up at 562cc's on the ROMRaider scalar, which more than doubles the original scaling, and I haven't had any problems with them. Just make sure you have a way to tune for them, and that you don't cut the screens from the side like the WRX ones- you have to file the disk away from the very end of it where the microweld is.
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Old 08-22-2009, 08:43 PM   #7
Team Scream
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Quote:
Originally Posted by midnight2.5rs-t View Post
he has the choice of open tuning with the 07. no need to change intake manifold as i have seen alot more guys with wrx's and sti's swtich to the 2.5i mani(on bigger builds) i have heard it flows alot better than the wrx due to the way the runners are set up. i would suggest notching your cross memeber and getting wrx up and down pipes and rotating the pipes just a bit to clear you intake manifold so your not 90 degreeing the the turbo inlet so it flows alot better. look around for injectors that is a must if you go for boost. then what ever questions you have could find here with a little searching its there.
The reason your 2.5i manifold is desirable is that there are no TGV's in place on the N/A Impreza.
The TGV (tumble generator valve) is a butterfly valve and is contained within a "riser" which bolts directly to the head, the manifold then bolts to to the tgv.

I think you should keep the manifold, but research the differences (if any) between the n/a and wrx throttle bodies.
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