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August 29th, 2006, 06:14 PM
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Supercharged Samurai
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Join Date: Mar 2006
Location: Winnipeg
Posts: 608
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2.5rs
Alright I'm a Roo fan so I'm gonna get this shit rolling.
I've always wanted a ~'99 Impreza 2.5RS. Just wondering if that motor is good for boost? How does it compare to the STi motor? What is the displacement difference between the two? I think the STi is a 2l? I know there's a special STi called the 22B, which is a stroked STi AFAIK.
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August 29th, 2006, 06:23 PM
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Fancy Boy
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Join Date: Mar 2006
Location: MIAMI
Posts: 159
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when you buy a gc8 (2.5RS is a 2.5l na motor) what you need to do is pull out the naturally aspirated motor, and replace it with either a jdm 2.0l turbo/tranny from a gc8 model wrx/sti or a usdm 2.0l engine and tranny from the usdm wrx, or the 2.5l turbo/tranny from the usdm STi.
no point in blowing a few engines before you get it right.
by the way, the engines bolt in very very very easily.
there were very few 22b STi ever made. Subaru of America has 1, i think subaru only made 50 or so
in my opinion, get the 2.5l turbo from the usdm sti.
Last edited by Disillusioned : August 29th, 2006 at 06:26 PM.
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August 29th, 2006, 07:12 PM
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Boost Addict
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Join Date: Mar 2006
Location: New York.
Posts: 481
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I think with the rite ecu and turbo a 2.5rs motor will hold up as well as any 2.0 or 2.5 thats factory turbo'd. all you need is the factory parts from a salvage vehicle to make it all possible, very easy to do. maybe not so easy to find the salvage vehicle though, even wrecks go for quite a bit.
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August 29th, 2006, 07:21 PM
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The peoples Admin
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Join Date: Mar 2006
Location: Miami, Fl
Posts: 25,002
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I heard some where that the 2.5rs could actually put down more power boosted then the 2.0 turbo. Is this true?
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August 29th, 2006, 07:23 PM
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Boost Addict
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Join Date: Mar 2006
Location: New York.
Posts: 481
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Quote:
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Originally Posted by Ricky
I heard some where that the 2.5rs could actually put down more power boosted then the 2.0 turbo. Is this true?
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yes in stock form this is true more displacement.
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August 29th, 2006, 08:18 PM
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Supercharged Samurai
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Join Date: Mar 2006
Location: Winnipeg
Posts: 608
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There's a few guys in my city with 2.5RS Turbos. What is wrong with the motor in stock form? Can't handle power? What about the transmission?
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August 29th, 2006, 08:21 PM
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The peoples Admin
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Join Date: Mar 2006
Location: Miami, Fl
Posts: 25,002
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Click For original image
Click For original image
* Stock EJ257
* SOHC Heads
* TWE valve springs/retainers/stage II cams
* Link Plus ECU
* Zeitronix Wideband with LCD Screen
* Aeromotive FPR 1:1
* Custom FMIC with stainless piping
* Forced Performance 20G TD-06H
* WRX Headers (spacer needed in crossover pipe)
* Custom Up-pipe <modified GPMoto (changed angles after flex section, rotated flange slightly)>
* Invidia Turboback
* Walbro pump
* RC650 cc Injectors
* WRX Cross-member
* Spec Stage 3 clutch (4 puck)
This setup was tuned by PDXTuning, one year ago this week, and yielded 319whp on pump 92, and 342 on 110.
Quote:
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Originally Posted by XLR8
There's a few guys in my city with 2.5RS Turbos. What is wrong with the motor in stock form? Can't handle power? What about the transmission?
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theres a half a litre more of displacement
Last edited by Ricky : August 29th, 2006 at 08:25 PM.
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August 29th, 2006, 08:21 PM
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Supercharged Samurai
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Join Date: Mar 2006
Location: Winnipeg
Posts: 608
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redex
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August 29th, 2006, 08:24 PM
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The peoples Admin
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Join Date: Mar 2006
Location: Miami, Fl
Posts: 25,002
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how about now
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August 29th, 2006, 08:43 PM
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Supercharged Samurai
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Join Date: Mar 2006
Location: Winnipeg
Posts: 608
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moneybags 
That's some good numbers, concidering the stock RS came with like 165hp.
I always thought the 2.5RS was a good motor, just wasn't sure if the internals can handle very much power. How does the trans. stand up against the STi??
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August 29th, 2006, 10:20 PM
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Fancy Boy
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Join Date: Mar 2006
Location: MIAMI
Posts: 159
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that dynosheet that ricky posted isnt a stock 2.5rs block.
engine code ej257= sti block.
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August 30th, 2006, 01:00 AM
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Boost Ninja
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Join Date: Apr 2006
Location: central, NJ
Posts: 598
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The 2.5rs block cant take boost..its pointless boosting it..
tranny is the same as the usdm wrx..there ok but if you beat on them they'll break...because subaru took that tranny and put it on the wrx when the first wrx's came out in 02 thats why trannys were blown like mofo's..
that dyno sheet..was the ej257..which is the verison 7 motor..very good block..ALL jdm sti blocks has forged internals in them..thats what makes them alot better..
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02 psm wrx.(blown motor) built motor in the process
89 crx HF..SOLD!!! 
05 toyota tundra sr5 4DR 4.7L v8
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August 30th, 2006, 01:47 AM
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Fancy Boy
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Join Date: Mar 2006
Location: MIAMI
Posts: 159
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Quote:
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Originally Posted by triniskill
The 2.5rs block cant take boost..its pointless boosting it..
tranny is the same as the usdm wrx..there ok but if you beat on them they'll break...because subaru took that tranny and put it on the wrx when the first wrx's came out in 02 thats why trannys were blown like mofo's..
that dyno sheet..was the ej257..which is the verison 7 motor..very good block..ALL jdm sti blocks has forged internals in them..thats what makes them alot better..
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the version 7 sti engine is not an ej257. the ver7 was a 2l |
August 30th, 2006, 01:52 AM
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Boost Ninja
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Join Date: Apr 2006
Location: central, NJ
Posts: 598
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Quote:
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Originally Posted by Disillusioned
the version 7 sti engine is not an ej257. the ver7 was a 2l
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oh damn...I misread that..I feel dumb now 
its the usdm sti block
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02 psm wrx.(blown motor) built motor in the process
89 crx HF..SOLD!!!
05 toyota tundra sr5 4DR 4.7L v8
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August 30th, 2006, 02:46 PM
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Fancy Boy
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Join Date: Mar 2006
Location: MIAMI
Posts: 159
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at this point in time in the subaru world, there really is no point going for the jdm engines. the 257 is where its at.
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