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Old 03-18-2008, 10:20 PM   #1
02WRXNY
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Default 95 Legacy wagon. WRX motor swap?

OK, My friend has a 95 Legacy waggon. Basicly it was his beater but everytime I get parts he takes my stockers (rims/tires/suspension/brakes) ect. So, were thinking about droping in a WRX motor being that they are so cheap now.

The car is a auto so, Im assuming it has a 4EAT? If anyone can confirm.

Also, I think it is a OBD2 car even know it is a 95. Again if someone can confirm.

Baring them problems... I dont see why not a EJ20 will bolt up. I remember a while back in the subaru mag that they said a older lagacy was basicly the same as a Impreza and that everthing bolts up however the exhasut needs to be lengthend by 3"s or something.

So, Im guessing I would need the motor, ECU (for automatic), and the wireharness.

Anything else you guys think I would need? Like will the instro cluster work? will the radiator handel it?

Any input guys?
Thanks!!!
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Old 03-19-2008, 03:54 AM   #2
Jonathan
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The front cross brace must be replaced with one from a turbochaged WRX or early Legacy SS so the up/down pipes & turbo wont have clearence issues.

YES, your '95 Legacy has an OBD-II compliant hook-up and it does use a 4EAT automatic.

If you are seriously going to do the swap, you should drop the 4EAT and swap both the rear diff and the WRX's 5-speed, and you should swap both the front and rear brake rotors, calipers as the stock Legacy brakes are a tad wimpy for 237+ BHP. Keeping the 4EAT is certainly simplier to do, though.

Your Legacy Radiator has coolant passages both for antifreeze for the motor and ATF fluid for your 4EAT automatic. If you are replacing the 4EAT, you would likely want a radiator from a manual Legacy.

The biggest bugaboo in doing a WRX turbo swap to either an early Legacy or an Impreza has to be the wiring. In my personal opinion your best bet would be to PURCHASE a wiring harness that has been wired specifically for the swap. http://www.EastCoastSwappers.com (along with other places) will sell you a harness. Doing the electrical wiring (merging both your existing harness with the WRX ECU and motor) is easily the most complex part of this swap. While plenty of people have done it on their own, having it done for you by people who do these sorts of swaps for a living is a wise decision, imho.
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Old 03-23-2008, 08:42 PM   #3
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Im am the owner of the wagon 02wrxny is talking about.. as for parts like suspension would i look for a wrx or impreza? also if there anywhere or anyone who has the paperwork on mergeing the harnesses being that electrical work is not a new skill for me?
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Old 03-23-2008, 09:52 PM   #4
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The motor will bolt up but there will be fabrications necessary. The wiring is no simple task, if you have no experience with it you may want to find someone who does, and im sure a diagram is out there i just dont know where. Let it be known this is not going to be easy and it is not going to be cheap. You will most likely not stay within your budget so if your budget is tight you may want to reconsider. I dont want to scare you off but just make sure you know what you are getting yourself into before you do it. To put it in a simple way, swapping the motor/trans is the easy part. You are going to need to do your research through this forum as well as the subaru conversions section to see what you are getting into. As far as whether its ODBII or not, im not sure but couldnt you just check for the ODBII port down on the left by the hood latch?
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Old 03-23-2008, 09:57 PM   #5
makipsee
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well as for swaps im not 2 afraid of fab work or anything like that... like right now im also in the middle of a big project car... a 1985 supra with a 93-98 drivetrain which the whole thing is pretty much fab work... and budget wise time is my budget so if it cost to much ill wait a little while till i have the money
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Old 03-23-2008, 10:08 PM   #6
02WRXNY
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WHats up Mack? Good to see ya signed up!


So, if a swap is gonna be pricey what is the most cost affective way to SAFELY get power to this Legacy?

Since we are bolting all the WRX parts on it... IKts turning into a hell of a little auto Xer.

Its got Brakes, Suspesion, Rims/tires. Just missing power. I think he Dyno'd at 93AWHP. Not terrible (over 100K with a auto and AWD) but a nice bump would be awesome!


On a side note were gonna be bolting on Stock WRX brakes to he battlewaggon and I just wanna confirm that they are a TRUE bolt on.

I just put Brembos onto my WRX and I was not aware that I needed different caliper bolts ect ect.

Thanks for all the help guys!!!!
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Old 03-23-2008, 10:31 PM   #7
legacy1907
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if you want it to be an autoxer, make it stiff as hell, get some good sticky rubber on there and do a tranny swap....only problem is i think a tranny swap gives you problems with what class you run in....a wrx swap is the most efficient way to get power, the tricky part is doing the swap the most efficient way t o save time adn money. There is a guy on here called "zephyr" you may want to contact him about doing the wiring because he is not that expensive and he is quick. If you do that, get yourself either a complete donor car or atleast sit down and figure out everything you are going to need before you start, this will make life much easier. Then its just a matter of taking the interior apart, putting the new harness in, putting the interior back together, doing the mechanical work and then troubleshooting to get the thing running. there are deals to be had if you are patient enough. Best thing to do is get yourself a plan and budget and find the deals to get yourself a fast little sleeper for the best amount of time/money possible...heres a few pics etc. to give you an idea of what you are getting into, i would definately search through the subaru conversions section as well
http://phpbb2.turbotimelounge.us/php...pic.php?t=1491
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Old 03-23-2008, 10:40 PM   #8
02WRXNY
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Thanks man!

I was thinking about a manual swap too but that would just be a another week link.

The classes that we have are

4cly
4cly Forced ind and 6cly NA
6cly Forced ind and 8cly NA

and then the same for R compunds.

So, Im actually thinking about keeping the motor NA for the best chances for him to win. If we do a WRX swap he will be with built WRX, STi, and EVO's alnog with 350Zs and such.

Whats the best way to get some NA power? Best bang for the buck?

Also, where would he get swaybars? Are they the same as a WRX waggon or are the Legacy waggon different?

Thanks so much man!
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Old 03-23-2008, 10:59 PM   #9
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i think you can get the fronts from a wrx but not the rears.....ive picked up most of my suspension stuff from boxer4racing.com.....before i did my swap i had my NA 2.5 with a borla header random tech hi flow cat and stromung catback and i used to hang w/ people in my autox class no problem. I felt like the cat had the most effect on my car without question as far sa power goes, but that could be because it was the last exhaust mod i did so it just made the whole exhaust wide open. I believe there is a suspension faq at the top of the legacy section with lots of good info on which wrx suspension can be used on our cars. as far as i know the front sways can be taken from atleast an 02-03 wrx (probably wagon in your case) but the rears are different because of the way the spare tire leaves a big bulge under the car so pretty much have to be legacy specific unless you plan to bash away at the underside of the car w/ a hammer or something
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Old 09-07-2011, 05:33 PM   #10
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Quote:
Originally Posted by Jonathan View Post
The front cross brace must be replaced with one from a turbochaged WRX or early Legacy SS so the up/down pipes & turbo wont have clearence issues.

If you are seriously going to do the swap, you should drop the 4EAT and swap both the rear diff and the WRX's 5-speed, and you should swap both the front and rear brake rotors, calipers as the stock Legacy brakes are a tad wimpy for 237+ BHP. Keeping the 4EAT is certainly simplier to do, though.
So the STI engine would bolt up to the 4eat transmission? (though it would have a shortened life span with that much power)

Oh ya. Bump!
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Old 09-07-2011, 05:54 PM   #11
Azlegacy
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That transmission will prbly explode with STI power.
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Old 09-07-2011, 05:57 PM   #12
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Quote:
Originally Posted by Azlegacy View Post
That transmission will prbly explode with STI power.
I realize this.... If you actually slammed the throttle down and launched you'd probably assplode the tranny. I'm curious if the trans WOULD bolt up to the engine.
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Old 09-07-2011, 06:41 PM   #13
makipsee
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wow talk about necroposting lol... this WAS my wagon the OP was talking about... but it met the business end of a couple of sledge hammers
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Old 09-08-2011, 12:42 AM   #14
Azlegacy
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A good option would be a auto wrx. Have it built and it should bolt up and hold the power.
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Old 09-08-2011, 02:33 PM   #15
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So... will an sti engine bolt up to a 4eat trans?

Quote:
Originally Posted by makipsee View Post
wow talk about necroposting lol... this WAS my wagon the OP was talking about... but it met the business end of a couple of sledge hammers
I use the search unlike some people, figure its better to bump an old thread than make a new thread.
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Old 09-09-2011, 01:12 PM   #16
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BUMP, so will the engine bolt up to the 4eat?
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Old 09-09-2011, 04:14 PM   #17
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ttt.,.,.,./,./,./,./,.
,.
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,.',.',.'
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Old 09-12-2011, 01:28 PM   #18
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Done lots of reading over the past week. So this swap will work, the STI\wrx engine SHOULD bolt right up to your 4eat (no idea on years or if the years even matter).

For tranny control I've seen it mentioned here or else-ware I don't recall (google it you lazy bastard) about using the original ECU to control the tranny, it would need to be wired in to speed sensors and IIRC the RPM of the new engine. Basically you'd be gaggle****ing 2 ecu's together, one for engine management and another for tranny control.

I'm not certain if this will cause an issue or if it will be workable at all. I'm just posting what I've found and read on the subject of mating an sti engine with an NA 4eat.

As for exhaust and front crossmember issues, I've decided I would like to do a rear mount turbo (read: Remote mount turbo), basically using a smaller than stock turbo to keep spool times down and pressure up. I don't fancy driving around above 5k rpms so as long as I am still boosting up TO 5k I'll be plenty happy, and not TMIC is required for this as the exhaust temp is about 200f in the rear by time it gets up front its down to about 100f (dependent on ambient temp and speed of course).

One reoccurring thing I keep finding is that you WILL WANT to monitor your intake temps, tranny temps, and exhaust temps REGULARLY IE (A piller tri-pod) at least that's what I would use for this. Also a boost gauge is a must .

For ducting I figure routing the new RMT (rear mount turbo) up in to the rear bumper area, panel off around the turbo so no or VERY LITTLE water can get there leaving the opposite side mostly open to allow air flow.

A stand-alone oil reservoir and electric oil pump is also a good idea, IMO better than feeding lines from the front of the vehicle to the rear. Personally I don't think that an oil cooler is necessary with as low as the temp is at the rear of the vehicle however, I WOULD put fins on the oil reservoir to make sure heat did not become an issue.

From my limited understanding of fluid dynamics, a large volume flowing through a smaller opening will have a higher velocity than that of a fluid flowing through a larger diameter opening. IE to speed up the exhaust in the rear I would utilize 2.5in ID tubing back to the turbo then shrink that down to about 2in OD or 3.75in ID tubing. This would speed up the exhaust gases which will also help with any lag that could happen using a RMT on this small of an engine.

That's everything I've pieced together over the last 3-5 days of searching about doing this swap, everything seems to work and the only parts you need are a long block with turbo, lots of steel tubing (if you're doing a RMT like I plan on) and the turbo engine ECU. You'll also need a turbo crossmember if you plan on using the stock turbo mounting location.
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Old 09-12-2011, 10:39 PM   #19
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The wiring harness is the easiest part to do; it's just wiring follow the already public wiriing diagrams and you're good to go

the thing is you'd also need the crossmember from
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Old 09-13-2011, 01:40 PM   #20
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^ I'm hoping to avoid that by using a rear mounted turbo meaning the headers would come back in the same spot just with larger diameter tubing.
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Old 02-22-2012, 08:44 PM   #21
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I am very new here lol. Its my fist day to bee a member. I was wondering if there was a place I could purchase a conversion wiring harness? Is anyone aware of a place that would sell one?
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Old 02-22-2012, 09:25 PM   #22
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I'd be surprised if there was an off-the-shelf place which would have a BD/BG/BK to WRX harness, but your best bet would be to find shops which offer any conversion services and start there.
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Old 02-28-2012, 01:03 PM   #23
tomtom1253
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Default 2003 legacy wagon swap

I have a 2003 Legacy GT wagon with 200k miles on the EJ253 engine and a manual tranny. I have access to a wrecked 2007 Impreza with 36k miles on a EJ255 engine and a manual tranny. Can I swap the engine and tranny from the 2007 into the 2004 without extensive modifications? Any info or help in finding instructions as to whether this is possible would be greatly appreciated. Thanks

Last edited by tomtom1253; 02-28-2012 at 01:04 PM. Reason: wrong posting place
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Old 02-28-2012, 07:13 PM   #24
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It should be a straightforward swap, but you are venturing into an area where few go, which is transplanting across models.

Thankfully they're both OBDII, and everything will bolt up fine. It's the electronics and sensors which may have, and likely have, changed between 03 and 07.
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Old 03-03-2012, 03:18 AM   #25
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Hey I don't know if you had your heart set on a "newer" motor but you might want to consider an Ej22et single cam turbo motor out of a early ninetees Legacy, the swap would certainly be easier and you'd spend ALOT less on the swap. Just food for thought, I have a 94 Turbo wagon so any questions feel free to pm me!
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