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The WRX should work fine if you can get the WRX OEM Up/Down Pipes to fit into your RS (or have custom one's made). I think that there are several people undertaking this type of project. As far as 5 psi, you would need to get some type of new wastegate, since the spring in the TD04 is set for something around 14 psi. The WRX turbo is probably a little bigger than the Legacy RHB5, but like the Legacy turbo, you will probably run out of steam in the upper RPM range.

Graham
 

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get a manual boost controller and set it low and you can keep it around 5 psi. as for when you hit the upper range, the turbo will run out of steem so you won't have the top end like with a garrett t3/t4 or vf23.
 

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The way I see it. If a TD04 from a WRX can flow enough air for 217hp on a WRX, it can flow enough air for 200+ hp on a 2.5. It is a little bigger than the RHB5, I've actually had both installed on my car, but have not run the TD04 since it's not mine.

If you go that route, I have some of the parts you will need on my site. You might also check my turbo parts list for recommended parts for the swap you are considering. A basic setup with this turbo will run around $1500.



I have one up pipe in stock for $200 if you are interested and can have a downpipe in about a week. I'd suggest Jet-Hot coating though.

Chad
93 1.8T
www.uniquemotorsports.com
 

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Discussion Starter · #7 ·
chad, i'll get in touch with you once i've got the money to start collecting the parts i'd need for turbo.

I'm probably gonna get started with gauges and engine/fuel management first, any recommendations? :)


-vic
 

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For my pre-turbo setup I did an ACT clutch (six months ago), suspension (ver. 6 STi), lots of brake work, GReddy 52mm Fuel Pressure, EGT, and BOOST!


Graham
 

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KillerTHC said:
get a manual boost controller and set it low and you can keep it around 5 psi.
I would have to vote against that idea. I know of several people who fragged their motors trying to use a MBC at low boost levels, myself included.

Just let the wastegate regulate boost if you are only running 5psi. No need for anything fancy.
 

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Here is a link to a VERY basic turbo setup I made using the WRX turbo.

http://www.uniquemotorsports.com/subachad/mods/turbo_parts.htm

Oh, and AZ Scooby is right, you can raise boost with a boost controller, but you can't lower it any less than the spring setting. I explain that on my site under the FAQ.

Chad
93 1.8T
 
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