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Old 10-26-2000, 06:46 PM   #1
Scooby Newbie
Member#: 1808
Join Date: Jul 2000
Location: Ogden, USA
Post someone posted about adapting legacy turbo to impreza rs:

I remember someone posting about that in the sales section on a JC sports turbokit group buy. I did a search and couldn't find that post. Could you the person who posted that info, or someone knowadgeable on that info help me out.

I could do it myself, I figure I'm knowadgable enough to figure everything out. Just thought since someone has done it first I would get the headsup.

Can you take the legacy turbo exhaust manifold+turbo and just bolt it on the RS? Then just work a custom exhaust system and intake tract? Or did the person making it just make an uppipe to the Y manifold on the RS? I think that a ported legacy turbo exhaust manifold would work well.

I want to make 230hp street and 265-280 autocross.

I have a 98' impreza RS
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Old 10-26-2000, 07:51 PM   #2
Tim Prudence
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Member#: 216
Join Date: Aug 1999
Location: san diego, ca USA

You'll need a turbo crossmember too, as the turbo headers will not clear the RS crossmember. There's a lot more information available if you do a search in the old technical forum.

As far as making 265-280 hp, that turbo just isn't quite up to the task. Believe me when I say it maxes out at around 230 hp... it can only sustain 7 psi at redline and by my math that equates to 245 hp assumming 100% efficiency (and many, many other assumptions). But that's probably not that far off, if you want to get to 280 hp go for the Vishnu kit.
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Old 10-26-2000, 10:12 PM   #3
ImprezaRS dot com
over boosted again
Member#: 1458
Join Date: May 2000
Chapter/Region: RMIC
Location: Colorado Springs CO USA
2017 WRX Limited
2015 Forester XT, Tribeca



You will need an up-pipe from stock headers to turbo, a down-pipe from turbo to catback, a turbo to IC pipe and a turbo inlet to attach the air filter. This is all included in the kits people sell. Regular price for a rebuilt legacy kit is like $2,600 - $2,700 and they did a group buy for $1999 of which I am doing the instructions as a full color PDF file. I hope to finish it this weekend.

Larry www.ImprezaRS.com
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Old 10-26-2000, 11:29 PM   #4
Scooby Newbie
Member#: 1808
Join Date: Jul 2000
Location: Ogden, USA

well 230hp is still very reasonable, probably better anyways cause I have a 98' RS

I'm looking for a nice torque curve for autocross. I know all this stuff has been talked about, and I am aware of it mostly. Just now that I'm serious about putting a turbo on I have more questions.

Also, 230hp is the max hp for that turbo right? I mean flow rate is flow rate, even though it could only make 7psi boost on a 2.5L engine, It could make X boost on a 2.2L legacy turbo it would work out to be 230hp or around that.

Like for instance I get the cobb cams, or design and have some ground of my own (in which I am capable of, I've been learned base n/a tuning math for a while). The turbo would run less boost, because the flow rate of the engine has been modified.
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Old 10-27-2000, 08:52 AM   #5
out back
Member#: 1964
Join Date: Jul 2000
Chapter/Region: RMIC
Location: 84XXX


The 2.2T would probably max out at 230-250 because of the ECU limitations. Larger injectors, AA intercooler and ~13PSI of boost could net just about that much with proper intake, headers and downpipe.

This is what i'd LIKE to do, but i can't justify beating up this 4EAT much more! That, and i've got a blasted miss i can't pin down!
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Old 10-27-2000, 08:59 PM   #6
Andre Vandenberg
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Member#: 501
Join Date: Nov 1999
Chapter/Region: International
Location: Krum TEXAS
1998 2.? RS Turbo ;)


If you are looking for a turbo and up pipe, call Trey @ Cobb tuning, he has the 2.2 turbo with all the brackets and the up pipe as well. It is the stuff I took off of my motor when we built my 2.2 / MY98 2.5 "Hybrid"
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