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Old 05-17-2006, 04:21 PM   #1
DZnutz
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Default what it takes to turbo an 05 2.5RS

... in regrads to getting the motor mechanically ready.

ill assume an sti shortblock... will the stock RS SOHC heads bolt onto the block?

sti subframe... stock manifold, up-pipe, turbo/lines/plumbing, downpipe, catback. other than trying to figure out where from and where to feed the turbo lines is there anything else im missing?

how will the motor run with the RS heads?
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Old 05-17-2006, 04:26 PM   #2
AWD>FWD
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Trade it in for an 04-05 WRX?
Seriously, you will save money in the long run (other than insurance). A lot of the people that do the swap say they wished they would have just bought a WRX in the first place.
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Old 05-17-2006, 04:55 PM   #3
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that is not a option... the loss on the RS would be in the thousands
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Old 05-17-2006, 05:21 PM   #4
Matt Monson
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Doing a search in the AFI forum will yield much results...
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Old 05-17-2006, 05:29 PM   #5
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Mm, turbo
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Old 05-17-2006, 06:30 PM   #6
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A good turbo kit alone would cost you close to 5000 dollars if you got proper engine management with it. And that would allow you to run maybe 6PSI reliably, 9PSI with some reliability, and at maybe 10 - 12PSI your engine would blow up.
6PSI will net something marginally faster than a WRX. Would you lose 5000 dollars trading your car in for a WRX?
To run more boost you would need some better internals at the very least. A shortblock would be a better idea. Add $1600 for an STI shortblock to the $5000 turbo kit, then add the cost of installing it ($2500 at a dealership, if you're wondering), add the cost of dyno tuning it ($500 and up) and you will have 10000 dollars+ invested in a plain looking car with low reving heads that were never designed for turbocharging.
A pretty pointless idea, IMHO.

Mind you, this is comming from someone who has a full engine swap on my RS. I definitely spent more than I would have if I bought a WRX, but at least I drive the chassis I find most attractive, and it weights a good 300 pounds less than a rex.
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Old 05-17-2006, 07:50 PM   #7
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Quote:
Originally Posted by Matt Monson
Doing a search in the AFI forum will yield much results...
AFI forum?
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Old 05-17-2006, 07:54 PM   #8
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Quote:
Originally Posted by powerlabs
A good turbo kit alone would cost you close to 5000 dollars if you got proper engine management with it. And that would allow you to run maybe 6PSI reliably, 9PSI with some reliability, and at maybe 10 - 12PSI your engine would blow up.
6PSI will net something marginally faster than a WRX. Would you lose 5000 dollars trading your car in for a WRX?
To run more boost you would need some better internals at the very least. A shortblock would be a better idea. Add $1600 for an STI shortblock to the $5000 turbo kit, then add the cost of installing it ($2500 at a dealership, if you're wondering), add the cost of dyno tuning it ($500 and up) and you will have 10000 dollars+ invested in a plain looking car with low reving heads that were never designed for turbocharging.
A pretty pointless idea, IMHO.

Mind you, this is comming from someone who has a full engine swap on my RS. I definitely spent more than I would have if I bought a WRX, but at least I drive the chassis I find most attractive, and it weights a good 300 pounds less than a rex.
ive already factored in the sti short block... my question is will the RS heads bolt directly to the sti block? what combination will this yield?

Will the block directly swap in or will i need additional sensors/components?

will an sti manifold bolt directly and properly to the RS heads?... will the stock RS heads hold say 300hp at the crank?

if i was to trade in my RS for a WRX id lose right at about $5-$6K right now... keep in mind we have slightly different prices here in canada

all labour is me, pulling a motor is a few hours
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Old 05-18-2006, 12:34 AM   #9
moss
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Quote:
Originally Posted by DZnutz
AFI forum?
Aftermarket Forced Induction forum

http://forums.nasioc.com/forums/forumdisplay.php?f=50

the STi shortblock will NOT be a direct swap in. There's a few issues with doing that swap... I'd would suggesting asking over in the AFI forum, as they have a better understanding and many people have done the SOHC EJ253 to EJ257 shortblock conversion, etc.

However, it will cost you MORE to go this way, I'd say $6000 or more. For that price you can get a USDM 04-05 STi motor, wiring harness, turbo, STi top mount, and probably installed. In addition, AVCS, better heads and a more a solid motor (and more boost friendly)

Hell, for $6k you can find a full wrecked 04 STi at an insurance auction (with the right connections) and swap everything in so that it would be a direct bolt in.

(for example... http://forums.nasioc.com/forums/show....php?t=1005121, 04 STi part out )

Keith
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Old 05-18-2006, 11:43 AM   #10
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isn't the 05 RS drive by wire ...making the whole thing 5.46x times worse
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Old 05-18-2006, 12:15 PM   #11
LastResort
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Quote:
Originally Posted by Jaxx
isn't the 05 RS drive by wire ...making the whole thing 5.46x times worse
I don't think so, the 05 WRX is not.
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Old 05-18-2006, 12:27 PM   #12
DZnutz
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Default

Quote:
Originally Posted by moss
Aftermarket Forced Induction forum

http://forums.nasioc.com/forums/forumdisplay.php?f=50

the STi shortblock will NOT be a direct swap in. There's a few issues with doing that swap... I'd would suggesting asking over in the AFI forum, as they have a better understanding and many people have done the SOHC EJ253 to EJ257 shortblock conversion, etc.

However, it will cost you MORE to go this way, I'd say $6000 or more. For that price you can get a USDM 04-05 STi motor, wiring harness, turbo, STi top mount, and probably installed. In addition, AVCS, better heads and a more a solid motor (and more boost friendly)

Hell, for $6k you can find a full wrecked 04 STi at an insurance auction (with the right connections) and swap everything in so that it would be a direct bolt in.

(for example... http://forums.nasioc.com/forums/show....php?t=1005121, 04 STi part out )

Keith
great info, thanks ill look into it further there
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Old 05-18-2006, 12:28 PM   #13
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Default

Quote:
Originally Posted by Jaxx
isn't the 05 RS drive by wire ...making the whole thing 5.46x times worse
yes, the 05 RS is drive by wire... im hoping i can retain use of the RS throttle body
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Old 05-18-2006, 09:26 PM   #14
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Cool

If I were you, I wouldn't go that rought with the motor. You would spend to much money for what your going to end up with in the long run. Like mentioned before, you can find a usdm Sti motor and swap it in for around the same amount your going to spend to build the hybrid motor.

Also, since your car is already DBW, the swap is even easier. You would be more satisfied with the swap with the MUCH better flowing heads and quicker spool. IMPO
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Old 05-19-2006, 10:57 AM   #15
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so you've got a car that you've 5-6 grand over your head in (you said you'd lose 5-6 if you traded for a WRX), but you've got the money to do an engine swap?

are we making sound financial decisions with our lives?

sjd
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Old 05-19-2006, 09:24 PM   #16
DZnutz
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Quote:
Originally Posted by steve_d
so you've got a car that you've 5-6 grand over your head in (you said you'd lose 5-6 if you traded for a WRX), but you've got the money to do an engine swap?

are we making sound financial decisions with our lives?

sjd
thanks for your concern, but id have to swallow another $20K on top of the $5K i lose to get an sti... or another $12k for the wrx. thanks anyways
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Old 05-19-2006, 09:39 PM   #17
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just looking out for ya. seriously...I've been out of dumb debt (credit cards, frivolous things) for about 4 years, and it feels great. the mrs and I have two payments in our lives. house, and one car at a time. I'm saving 35% of my paycheck between 401k and investments.

sjd
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