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Old 08-23-2001, 02:33 PM   #1
gromit
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Lightbulb MY02 WRX into RS

Anybody know how difficult it is to install a MY02 WRX engine & trans into a MY00 RS? I assume it would fit right in there, but is it a wiring nightmare like a JDM engine swap? Will the MY02 crossmember fit? Are the axle splines the same? What else haven't I considered? Any info is appreciated.
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Old 12-23-2001, 06:42 PM   #2
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I'd like to know if the mounts match up too....i did a search and only came across this thread.
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Old 12-23-2001, 06:45 PM   #3
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Quote:
Originally posted by Superu
I'd like to know if the mounts match up too....i did a search and only came across this thread.
no the MY02 cross member won't work you'll need one off a GC8 WRX...also will need a full wiring loom and ecu off a GC8 WRX. This is NO EASY SWAP. the trans' are the same except the MY02 WRX has a shorter final drive 3.90:1 as opposed to the RS 4.11:1 so you will also need a rear diff as well.

Good luck, but why do you want to ditch the 2.5??

jeremy
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Old 12-23-2001, 10:38 PM   #4
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Quote:
Originally posted by HndaTch627




Good luck, but why do you want to ditch the 2.5??

jeremy
I don't own an impreza, can't afford a new one. I had almost given up on an impreza wrx until WRXGirl's conversion inspired me. I've been looking into the JDM engine swap into a L sedan for awhile...all the parts i'd need are pretty much the same...harness, crossmember to clear turbo manifold, etc etc...I just wanted to make sure that the mounts to the engine and tranny were still in the same place for the MY02. Thanks
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Old 12-23-2001, 11:22 PM   #5
HndaTch627
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FYI the EJ20T has been produced since 94(IIRC) and has been in the GC8 body style since then. The MY02 has the same mount locations as do all subarus. Also if you choose to use a JDM engine in order to make it work right you will need to add a bit of octane booster to each tank of gas to reach the type of gas the ECU is programmed to run on. I wish you the best of luck though, but i'd personally go for an EJ22T...the best of both worlds, more torque and run high boost

Jeremy
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Old 12-24-2001, 09:58 PM   #6
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Currently, I am in the middle of the very same conversion. I have a 2002 USDM WRX engine. But I plan on using my stock RS Transmission as I did not have the cash to change out the entire driveline (that would be needed to use the WRX Tranny).

Good news for those who are thinking of doing the very same thing is, that the RS Flywheel will mate right up to the WRX engine.

As for the Turbo Crossmember........I have compared it to that of a Turbo Legacy and both look identicle, So I believe they will work. (Many have used the Legacy C/M when putting in a JDM EJ20 engines).

Wiring harness is not as bad as that of the JDM WRX assy. As it is a LHD unit already, only thing is needed to do is to remove the RS harness and install the WRX harness in it's place. I am not saying that this is easy, but it is much easier then trying to convert the RHD JDM Harness.

I plan on spending about 2-months to do the conversion (want to take my time and make this as good as factory as possible.....basically right the first time.) I have all the parts needed except the Crossmember (as the original unit was slightly damaged in the accident that allowed me to get the engine) and I am awaiting the arrival of the Legacy Crossmember that I can use for my car.

If anyone wants more details of everything in the conversion....feel free to PM me.

Cheers

EddyL.
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Old 12-24-2001, 10:18 PM   #7
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eddy has the right idea...getting a US spec wiring harness is the way to go. But just watch yourselves cause getting a jap-spec engine to pass emissions(especially you california guys) can be EXTREMELY tricky.

Jeremy
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Old 12-24-2001, 10:31 PM   #8
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Default leaning this way also

I haven't even bought a subie yet, I am looking at the my00. I think that I too will be looking at the ej20t swap, I should be able to hold my own on the mean street of Michigan(lots of detroit iron). I figure an ej20t tech II or the like, 550cc or larger and a larger turbo(not yet determined) A good tmic, maybe a fmic, and shed a few lbs off that car if I can. I think they are 2800ish stock... I like to loose another 100lbs if I can, maybe a cf hood, and sti suspension if its not WAY to much $$$$(proably is). Sorry so long I just get lost in myrs/wrx fantasy.


Good Luck to all , and happy holidays
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Old 12-25-2001, 09:55 AM   #9
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Oh, just thought I'd let you know that if you decide on an EJ22T that there is one for sale at Paul Eklund's site. It's completely rebuilt and is going for CHEAP. I'd get it, but I've got an EJ25T

~Garrett
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Old 12-25-2001, 04:41 PM   #10
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Default Re: leaning this way also

Quote:
Originally posted by geronimo
I haven't even bought a subie yet, I am looking at the my00. I think that I too will be looking at the ej20t swap, I should be able to hold my own on the mean street of Michigan(lots of detroit iron). I figure an ej20t tech II or the like, 550cc or larger and a larger turbo(not yet determined) A good tmic, maybe a fmic, and shed a few lbs off that car if I can. I think they are 2800ish stock... I like to loose another 100lbs if I can, maybe a cf hood, and sti suspension if its not WAY to much $$$$(proably is). Sorry so long I just get lost in myrs/wrx fantasy.


Good Luck to all , and happy holidays
why not just build up the ej25?
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Old 12-25-2001, 05:06 PM   #11
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Default ej25 + turbo = dead trans

From what I am seeing the ej25 can make great power, though its torque kills the crap trans in these cars. The ej20t can make a ton of power and less torque, allowing the trans to live a longer life. I figure an ej20t with a good turbo upgrade, electronics, ic, and the rest of the supporting cast should make for a strong daily driver.

Plus the lighter rs body should help the overall performance, not to mention the durability...
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Old 12-25-2001, 06:17 PM   #12
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It's true the EJ25 is hard on trannies. You can break 2nd gear with an EJ25 without a turbo if you install an upgraded clutch. I think if you wanted to build up an EJ25T than leave the clutch stock. This should allow enough slip to keep the gears from going out on them. Otherwise if you just take it easy in the lower gears you shouldn't have to worry too much.

I'm wondering what the difference in costs of these two idea would be, EJ20T swap or EJ25 build-up. If building the EJ25 is cheaper maybe there's enough leftover for a transmission upgrade. We were toying around with the idea of an STi TypeRA gearset from the STi ver4 WRXs. It was going to cost about $1200, and the gear ratio was lower making your top speed lower, but it was going to be a straight swap on the transmission. I haven't heard much on this recently though.
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Old 12-25-2001, 08:38 PM   #13
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Default I waould like to see a comparo...

I would lovet o see some people who have done it post their experiance and cost break down as well as their performance numbers. All in one place on one thread... to much searching.

I think an ej20t is the way to go, I think an rs with a mildly modded ej20 would run some serious numbers, reliably. I think adam blooms car was running an ej20t, though I am not sure about that. I am sure that their is a ton more in the after market for the ej20t due to its world wide use.

as for the trans my understanding is that the only "good" trans is the 6spd, at a sever cost!!!

As for now I am thinking I will try to source an ej20 slap a big turbo on it, a tec II(or other) and big fuel system I think I can be done including the car for the at or under the price of a new WRX, with performance beyond the STI's.

Wow I talk a lot.. sorry
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Old 12-26-2001, 03:01 AM   #14
Ver.III
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[quote]Originally posted by HndaTch627
[B ]........ Also if you choose to use a JDM engine in order to make it work right you will need to add a bit of octane booster to each tank of gas to reach the type of gas the ECU is programmed to run on.


Why does everyone keeps saying this ? The JDM will run fine on premium pump gas here. Yes the stock JDM ecu has a base program for higher octane but it has a knock sensor and the "self-learn mode" as pretty much all the Subaru ecu's have. It will back the timing off with the less octane fuel . As said before, the Sunoco Ultra 94 is equivalent to 98 octane in Japan. So it is not far off. Even if you were extremely concerned, just run an ITC and then you can run higher boost to make up the difference.

Just my humble 2cents(from experience)
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Old 12-26-2001, 03:07 AM   #15
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[quote]Originally posted by Ver.III
Quote:
Originally posted by HndaTch627
[B ]........ Also if you choose to use a JDM engine in order to make it work right you will need to add a bit of octane booster to each tank of gas to reach the type of gas the ECU is programmed to run on.


Why does everyone keeps saying this ? The JDM will run fine on premium pump gas here. Yes the stock JDM ecu has a base program for higher octane but it has a knock sensor and the "self-learn mode" as pretty much all the Subaru ecu's have. It will back the timing off with the less octane fuel . As said before, the Sunoco Ultra 94 is equivalent to 98 octane in Japan. So it is not far off. Even if you were extremely concerned, just run an ITC and then you can run higher boost to make up the difference.

Just my humble 2cents(from experience)
why you ask?? cause i have seen honda after honda fail emissions trying to run on 91 or 93 around here(we don't have sunoco) and as son as you dump in a can of octane booster they clean themselves up and usually pass, only high mileage cars(the cats anyways) tend to fail after that.

jeremy
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Old 12-26-2001, 03:24 AM   #16
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I wasn't refering to emmisions . I was refering to people keep saying that anyone doing a Sti /JDM swap is that you have to use octane booster with every tank fill.......bullocks!!!!! I have a swap on my car for over 2yrs with tons of abuse with pump gas. Yes, we have Sunoco up here but I have ran Esso 92 and others of less octane and I can say the only drawback is less power, obviously. But for anyone with a turbo car, that is expected. Peace.

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Old 08-16-2002, 11:12 AM   #17
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For the people doing USDM WRX swaps. What modifications need to be done to get the exhaust to fit, I'm guessing it doesn't just bolt right up to the GC8 mounting points. Does anyone know if the GC8 automatic transmission would bolt up to the USDM WRX motor, I don't see any reason why it wouldn't, but wanted to see if anyone knew for sure. Also can anyone provide more information about wiring the USDM WRX ECU into the GC8, I would like to know exactly what is involved there if anyone has experience with that. Thanks.
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Old 08-16-2002, 11:44 AM   #18
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Quote:
Originally posted by Superu


I don't own an impreza, can't afford a new one. I had almost given up on an impreza wrx until WRXGirl's conversion inspired me. I've been looking into the JDM engine swap into a L sedan for awhile...all the parts i'd need are pretty much the same...harness, crossmember to clear turbo manifold, etc etc...I just wanted to make sure that the mounts to the engine and tranny were still in the same place for the MY02. Thanks
Actually that engine in Pam and Ed's car (WRXGirl) is the Legacy 2.2 and the impreza used to be a front wheel drive only.
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Old 08-16-2002, 03:13 PM   #19
Mariano
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Quote:
Originally posted by RallyNavvie
It's true the EJ25 is hard on trannies. You can break 2nd gear with an EJ25 without a turbo if you install an upgraded clutch. I think if you wanted to build up an EJ25T than leave the clutch stock. This should allow enough slip to keep the gears from going out on them. Otherwise if you just take it easy in the lower gears you shouldn't have to worry too much.
Not all true. I put in a ClutchMaster's stage I.... It works good enough to hold 12 psis without hammering my transmission. People go straight to stage III, and from what I have experienced I now know it's not worth it. Power wise, I've gone head to head with a Z06, M3(333hp) and others... Also: NO DROPING THE CLUTCH in terms of "draging" will also let our "crystal" transmissions live long and prosper...

saludos

Mariano
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Old 08-17-2002, 11:03 AM   #20
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I dont know much about the swap of a ej25 to the ej20. But i can say one thing is for sure, Its expencive. I can tell you right now that the US spec ej20 is probably going to cost you about more or less 4 grand. (motor, harness, X member, etc). If you dont have much knowledge about the swap it very well could be a nightmare. So if you dont know what you are doing and you had someone else do the install it would probably be another 2 g's if not more. For me? I ordered myself a stage 2 kit from Tom at ludespeed performance. its $3500. install is not that difficlut. It could be done by someone with a general knowledge of turbos and what have you. True, the tranns are weak. But its a h3ll of a car to drive.

J.
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Old 08-17-2002, 10:44 PM   #21
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Quote:
Originally posted by slim speedy
For the people doing USDM WRX swaps. What modifications need to be done to get the exhaust to fit, I'm guessing it doesn't just bolt right up to the GC8 mounting points. Does anyone know if the GC8 automatic transmission would bolt up to the USDM WRX motor, I don't see any reason why it wouldn't, but wanted to see if anyone knew for sure. Also can anyone provide more information about wiring the USDM WRX ECU into the GC8, I would like to know exactly what is involved there if anyone has experience with that. Thanks.

Dose anyone know the answer to his question
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Old 08-18-2002, 08:24 PM   #22
EddyRS
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Default YES YES YES

To answer the question. YES the WRX stock exhaust will bolt up onto a GC8 body. With the exception of ONE hanger. (The one behind the muffler....all others match perfectly) This does nothing to the stability of the exhaust and can be used like this for the life of the car. Of course you have to be using the rest of the WRX exhaust as the muffler or muffler & Midpipe will NOT mount to the RS Header/Cats, only to the WRX downpipe. Though you could use modify the mid pipe end.

I have the WRX/RS conversion done on my car (1st to start/4th to complete) So I do know what I am talking about. I ran the stock exhaust for a while then had a custom 3" Cat-Back made for me.

Cheers

EddyL.
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Old 01-25-2003, 07:37 PM   #23
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I know I will get attacked for this, but I just don't see the point of a turbo "kit", It seems that all the people talking about how they are rebuilding this, or fixing that are 2.5 turbo guys. That and the "fast" RS-t people are running maybe high 13's.

Meanwhile their are a ton of WRX's running low 13's... so I figure same motor, same mods, in a 200+lbs lighter car whould be just as fast if not a bit faster.

Is it expensive.. Yea. But who said going fast is cheap.
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Old 01-26-2003, 01:59 AM   #24
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I can solve all you problems just go to i-speedusa.com. They can answear all you questions.

They can do the swap. Answear questions about doing your own swap AND they have a break down of how much a rs-t project would cost when compared to a rs to wrx conversion.
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Old 01-26-2003, 01:48 PM   #25
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Geronimo. Yamarocket630 is probably turning the key in his swap as I type this. Come out to the D&B meet on wednesday I'm sure he will answer many questions.
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