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Old 02-12-2001, 10:34 PM   #1
RSer2580
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Member#: 4065
Join Date: Feb 2001
Location: IL
Post Transplant

I'm hoping to replace my 2.5 liter with the Jap spec STI engine by the summer's end. But I need help gathering all the facts. Will it be a clean swap or do I need someone to adjust my motor mounts, etc.? Is Jap spec really more economical, or should I stick with the American version WRX engine and make adjustments? How much of my current hardware can support the upgrade? Can I buy an intake for my 2.5 liter that will also work on the WRX or STI? If I decided to use the American WRX engine with the 5-speed trans, will my stock trans do the job? Also, I'd like to find someone to buy my old engine off of me to help pay for the upgrade. Any hints as to who would be interested? If I have overlooked some important issues concerning this topic, please inform me or bring it up in the reply.

I appreciate everyone's input.

Sincerely,

Newbie--RSer2580

[This message has been edited by RSer2580 (edited February 12, 2001).]
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Old 02-13-2001, 05:46 AM   #2
scoobiejosh
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Member#: 3139
Join Date: Dec 2000
Chapter/Region: RMIC
Location: SLC Utah
Vehicle:
2001 Dodge Pikumup
& 08 Triumph Speed Triple

Post

IMHO it will come out more reliable to do the WRX swap with a stand alone ECU. I had a shop say that it could be done with the stand alone ECU for around $8,000, but i want it done totaly the right way so i figure $10,000. To do the swap right you want the engine, tranny, frount crossmember, rear diff, all the shafts, and the stand alone ECU. i think you can do just the engine but you will kill the 2.5 tranny quick. I say do it right the 1st time. The Jap spec ECU is tuned for better gas than we get in the US, so i think it is better toi ditch it. if you get a STI motor you can do 330-350h.p. on punp gas this way. This is just based on research i have done, and not my personal experience.

Josh
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Old 02-13-2001, 06:43 AM   #3
Cacophony
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Member#: 213
Join Date: Aug 1999
Location: Philly, PA
Vehicle:
2004 Mazda RX-8
Black

Post

You're not going to hit 350hp even on an STi motor without some serious $ invested in mods. Just browse through some of the dyno sheets over on Scoobynet for evidence.

I've got my fingers crossed hoping that my soon-to-arrive Ver. IV motor is a healthy one
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Old 02-13-2001, 11:08 AM   #4
Damon
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Join Date: Nov 2000
Chapter/Region: TXIC
Location: Nederland TX USA
Vehicle:
89 gmc work truck
08 jeep rubicon unlimited

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grr! this topic comes up so much! makes me jeleous of all you guys actually doing the engine swap! one day, one day i tell you! mwhahahahaha...
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Old 02-13-2001, 02:19 PM   #5
5 Door Man
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Join Date: Aug 2000
Location: Lancaster, PA, USA
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Damon-
I hear you!!! This summer my 1.8L will be getting a Cobb Tunign stage I power kit, but that's about all I plan on doing to the 1.8!! Thinking crazy turbo 2.2L, or a crazy built N/A 2.5L. The nice thing about my car is it's a bas emodel, so it's light!! (joining in on Damon's maniacle laughter!!)
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Old 02-13-2001, 03:34 PM   #6
Aspen
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Member#: 145
Join Date: Aug 1999
Chapter/Region: MWSOC
Location: The Windy City
Vehicle:
Banned to
Housework for Summer

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Yup, got a '94 base model too.
Thinking of getting rid of my Driver's side mirror too. hehe. J/K
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Old 02-13-2001, 04:11 PM   #7
apexkw
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Join Date: Jan 2001
Location: ft myers fl
Post

the guy to contact is adam bloom. he has all the knowledge you need....a big problem though is the wiring...nothing fits cuase it is all on the other side of the engine compartment.....anyways just contact him
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Old 02-13-2001, 05:26 PM   #8
adam99rs
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Join Date: Jun 1999
Location: New York
Post

I'm at the tail end of getting my car back from Rallsipec, so here are a few pointers to those looking to do the swap:

1. get the whole haness, engine and drivetrain together. Sure, your RS tranny will bolt up and work ok, but it is a weak link even in the stock car...the STi unit is much better...not perfect mind you, but much better. For the ultimate, get yourself the MRT box..I will be switching to it this summer most likely (end of summer).

As for motor, tranny mounts, the stock ones are the same, so no problems there. You will need a front x-member from eother the WRX, or a Legacy turbo (that's what I used). In terms of what otehr mods you can do that are switchable from the EJ25 to the EJ20, there are some generic ones...boost controllers, AFC, fuel pressure regulators. Intakes are totally different...rallispec can set you up with one of theris for a WRX, or I can get you any JDM style you want (ARC, Zero Sports, Syms, etc.). power steering lines need to be redone...easy to do though. Wiring is a bitch..heater core must come out (never fun on any car). Again, make sure you get a 100% complete harness.

Check what tranny you get....some years/models may require you get e new rear too (and ths, new axles)...oters won't...if it has a 4.11 internal ratio in the tranny, you are good to go, and can use the RS stock rear (LSD or non LSD)..f it has anything else (which would be either 3.90 if it's an old V2 or V3, or 4.44 if it's a V5 or V6, then get the whoe drivetrain, zxles and all. Again, this all depends which year /model you get...there are 99 and 00 WRX's (non STi) that have 4.11's.....make sureyou trust who you get everything from. Good luck and let us know how you come along!

I expect my RS (now full fledged WRX!) back on the road very very very soon, just as soon as we sort the ecu gremlin out and I shell over he rest of my $$....I will update my homepage as soon as I get the car back with loads of pics as usual.
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Old 02-13-2001, 05:30 PM   #9
adam99rs
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Join Date: Jun 1999
Location: New York
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Cacophony...you got a V4 motor too? An STi? Congrats man..I am sure you will be happy if it's a healthy one. When I first booked my car to have teh swap done, I was still among a select few to take the lunge. Now more and more are doing it. To stay on the cutting edge and keep my car unique, look for a 20B Cosmo motor in my Subaru by year end!!! (j/k)
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Old 02-13-2001, 05:44 PM   #10
RSer2580
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Member#: 4065
Join Date: Feb 2001
Location: IL
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Okay guys, thanks for the answers. I have posted a new message concerning the WRX swap. Hope you guys get a chance to share your expertise, cause I appreciate the input.

RSer2580
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Old 02-14-2001, 12:16 AM   #11
scoobiejosh
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Join Date: Dec 2000
Chapter/Region: RMIC
Location: SLC Utah
Vehicle:
2001 Dodge Pikumup
& 08 Triumph Speed Triple

Post

i was estimating flywheel h.p. Not to the rear wheels or all 4 wheels. Sorry i wasnt specific there. I think 330-350 is reasonable flywheel h.p. with a stand alone ECU, intake, downpipe, exhaust, and some additional boost from stock. Anyone with evidence on the flywheel estimate please feel free to correct me. i learn form being dead a$$ wrong.

Josh
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