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Old 02-11-2002, 01:14 PM   #1
Cusco
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Talking EJ20 turbo engine transplant in an RS

If the price is rigth and the translplant if fairly simple I will be getting an EJ20 turbo motor. What are the complications involved in the process of transplanting an EJ20 turbo engine into an RS? I heard it is, for the most part, a perfect swap. I just have a few questions.

Will I have to drill new holes for the motor mounts?

Will the engine fit with the transmission?

Since JDM imprezas have a reverse shift pattern, will the transmission need to be modified?

Since the JDM impreza is a right hand drive, will I have to re route cables from gas and clutch pedals, or move any parts around?

Can a novice mechanic do the job with instructions and help from other mechanics?

What octane gas do the JDM engines run on?

Any other big concerns or problems that I should be concerned about?

Thank you.

John
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Old 02-11-2002, 01:22 PM   #2
Julian
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The shift pattern is the same.

A novice mechanic cannot perform this swap.
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Old 02-11-2002, 03:50 PM   #3
kastle
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sorry john.... moving this to AFI (should be a good thing since more people that frequent that forum can answer that then in Serv & Maint)
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Old 02-11-2002, 03:59 PM   #4
skywalker
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Well I am helping out a fellow I-Clubber do that very thing this weekend. Pull out the RS engine drop the WRX engine, ECU and harness in ans see what happens. The harness is going to be the WORSE part. Good thing we have the manuals.

So we will let you know how it goes.
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Old 02-11-2002, 04:04 PM   #5
8Complex

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You shouldn't have trouble mating it to the transmission, but you will need a new crossmember to make it work. There are definite differences in the shape that allow the exhaust to go over the WRX crossmember while the RS's goes under.
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Old 02-11-2002, 06:59 PM   #6
subachad
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Bill,

You should have done it last weekend, then I'd help. Well, that's if anyone would let me know how to get to your new place. Anyways, I'm going to Oregon Saturday, so good luck with the future installs. I'll keep you updated on stuff.

Chad
93 1.8T
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Old 02-12-2002, 03:20 PM   #7
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Default Re: EJ20 turbo engine transplant in an RS

Quote:
Originally posted by Cusco
Will I have to drill new holes for the motor mounts?
No. You will need the JDM crossmember (that's where the motor mounts bolt to the car. The reason for this is to make room for the up-pipe.

Quote:
Will the engine fit with the transmission?
Yes but you will need a new clutch to handle the increase in power without slipping. If you're not swapping the tranny then you will be a little hurt on the lower end since the gearing is meant for a 2.5RS's torque band.

Quote:
Since JDM imprezas have a reverse shift pattern, will the transmission need to be modified?
I too was confused by this but when I finally sat in a JDM car I found that the pattern is the same as ours. They just learned with 5th and reverse closest to them. Odd, those people who drive on the wrong side of the road.

Quote:
Since the JDM impreza is a right hand drive, will I have to re route cables from gas and clutch pedals, or move any parts around?
If you are retaining your RS tranny then the only thing you have to worry about is the power steering. It needs to be re-routed to fit properly.

Quote:
Can a novice mechanic do the job with instructions and help from other mechanics?
Depends upon how novice you are. 2 years ago I didn't even own any tools. Now I've got a full complement with air tools and do all my own work including an STi swap. I would suggest reading some mechanics books first. Wiring will be troublesome for even veteran mechanics.

Quote:
What octane gas do the JDM engines run on?
98-100 RON. STi or WRX engines run fine on 98 RON which is like Sunoco Ultra 94. Next week I'll tell you how much they like that and the normal 91 octane you buy some places.

Quote:
Any other big concerns or problems that I should be concerned about?
Make sure you start with the correct parts and that nothing is bent/broken. Especially the crossmember. A legacy Turbo part will work but they're getting rare.

One other thing, which again in a few days when I get my car back from having the engine dropped in and ECU wiring done is the suspension. I've heard from someone else that the RS suspension is not up to that amount of power. Get on the gas hard and the car will completely bottom out.

2-3more weeks and I'm having DMS-50mm suspension installed. So I will be able to give a before & after.

Personally, I'd suggest getting and swapping the entire drivetrain. Then you can have a "GC8 WRX" that's as reliable as they were overseas and it will also drive the same.

-Michael
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Old 02-12-2002, 03:51 PM   #8
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d00f, I'm going to be doing an STi Ver. III swap. Please email me at guildtrent@michigan.gov . I'd like to talk to you. Thanks.

- Trent
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Old 02-14-2002, 07:49 PM   #9
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d00f, please keep us updated. Pro's and Con's...etc.I want to do the same thing with my GC8. WRX motor and drivetrain...


Thanks!


Skylab™
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Old 02-14-2002, 11:30 PM   #10
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Old 02-15-2002, 10:25 AM   #11
d00f
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Quote:
Originally posted by dsmawd
d00f, I'm going to be doing an STi Ver. III swap. Please email me at guildtrent@michigan.gov . I'd like to talk to you. Thanks.

- Trent
I would prefer to discuss this on the club, that way the entire Subaru community can benefit from any knowledge I've got and can share. If it's some ultra-secret thing then email me (michael@fastmail.ca)

-Michael
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Old 02-15-2002, 10:32 AM   #12
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Quote:
Originally posted by Skylab
d00f, please keep us updated. Pro's and Con's...etc.I want to do the same thing with my GC8. WRX motor and drivetrain...

Skylab™
Thinking of pros and cons I'd say that the only cons are the price and the availability of replacement parts. For example if you need a new clutch then you've got to order it from some place overseas. I'm fine because I live about an hour from Lachute and they order from MRT and Prodrive on a weekly basis and they even stock some GC8 WRX/STi parts.

In general you really want a complete front clip. I wish that I'd gotten a complete one as I'd have the single stage brake booster, aluminum a-arms and probably the brakes too. Also I'd have the full sized STi rad instead of the modified RS one (which isn't hard to do).

With the pros the list goes on and on. Since overseas there has already been a lot of development on the GC8 WRX then there are piles of parts available and people know what does and does not work. The best part I like goes against all these claims that the 2.5-T would be so much stronger at the bottom end. 4.44 gearing means it's geared properly and it only takes the first 10 feet from a stop before you hit boost and light up all 4 tires.

-Michael
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Old 05-12-2002, 06:44 PM   #13
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Rallispec had no less than 3 GC8 conversions in progress when I was there in early april...
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Old 05-18-2003, 04:31 AM   #14
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What is the price range of this swap from bare-minimum to totally complete swap? I'd love to do this swap but it sounds out of my budget... umm, some more questions.
Who can do the ECU wiring? How much is that?
Would a USDM EJ20 be just as suitable as one of it's STi counterparts?
Has anyone in the Portland/Vancouver area done this swap that could help me?
Does anyone have a 95-01 Impreza for sale (from Seattle to SoCal) under $9000?
Does anyone have feedback about before/after with the swap?
Thank you very much.
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Old 05-18-2003, 10:25 AM   #15
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If you have basic engine knowledge you should be able to do this motor swap. The wiring is another issue however.
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Old 05-19-2003, 09:24 AM   #16
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The price of swaps depend mostly on how complete of a JDM motor and wiring you have. Obviously if your missing vital parts, sections of wiring plugs, ECU, things like that the installer will have to source those. The three most well known places are Lachute, Rallispec, and Speed Bump. There are probably a hand full of smaller and just as capable places also.

Well a stock US WRX motor will give you 227hp out of the box from $2k-$4k. A JDM might be more, but with STi versions you can get 260-280hp out of the box and for a few $100 more dollars it could be 300hp. Even the most under powered JDM WRX was 220hp so JDM will always give you more power out of the box. The JDM swaps require more detail and sourcing parts is more difficult. The US WRX has a great aftermarket following now which is a plus because not a 100% of those parts will fit perfectly on Ver6 and older JDM's and you might have to look overseas for mods sometimes.
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Old 07-04-2004, 03:51 PM   #17
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If i buy a wrecked USDM wrx will wiring be a problem. Can i not just transfer the whole harnnes and ECU into the car without splicing? Or I am i going to have to map out all the connects and stuff?
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Old 07-04-2004, 04:15 PM   #18
HndaTch627
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Quote:
Originally posted by Subaruski420
If i buy a wrecked USDM wrx will wiring be a problem. Can i not just transfer the whole harnnes and ECU into the car without splicing? Or I am i going to have to map out all the connects and stuff?
first you bumped a thread that is 2 1/2 years old, second, you can directly swap the wiring harness, Subaru's are not like honda's where the ecu/body harness have seperate connectors, you WILL have to splice.

Pay someone to do it.

Jeremy
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