Welcome to the North American Subaru Impreza Owners Club Friday July 11, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 11-02-2011, 05:27 PM   #1
bishops'00RS
Scooby Specialist
 
Member#: 260490
Join Date: Oct 2010
Chapter/Region: MWSOC
Location: Shawnee, KS
Vehicle:
2003 WRX Wagon
PSM

Default ej205 to ej255 swap

The engine in my 03 wagon has almost 160k on it and I know that it is going to go out on me in the near future. So i am looking at options for my replacement. the engine (and supporting transmission) i am looking at is the ej255 due to the stability of the 06+ WRX drivetrain vs. earlier drivetrains. The thing that is most important to me is to make it as plug n play as possible. So what i want to know is this...

How simple (or complex) is it to put in an ej255 (and supporting transmission) into an 03 wagon?

I'm trying to avoid doing a ecu / harness swap and want to use as many bolt ons for my old setup (specifically exhaust, up/downpipe etc.) as possible.
* Registered users of the site do not see these ads.
bishops'00RS is offline   Reply With Quote
Old 11-02-2011, 05:56 PM   #2
fastnoypi
Scooby Specialist
 
Member#: 6886
Join Date: May 2001
Chapter/Region: Tri-State
Vehicle:
MY01 EJ207 HTA35r
nothing to see, i'm stock

Default

if you plan to do just a shortblock and trans swap it will be plug and play.
fastnoypi is offline   Reply With Quote
Old 11-02-2011, 06:14 PM   #3
rexblake
Scooby Specialist
 
Member#: 178426
Join Date: Apr 2008
Location: FoCo
Vehicle:
2010 Audi S4
Black

Default

Search "hybrid". There are numerous people doing a 2.5 swap.
rexblake is online now   Reply With Quote
Old 11-02-2011, 06:25 PM   #4
BlazeRex
Scooby Specialist
 
Member#: 268354
Join Date: Dec 2010
Chapter/Region: NESIC
Location: Massachusetts
Vehicle:
02 WRX 05 LGT
Slow Automatics

Default

You can make the 255 work. You need to move the cam sensor I beleive, and disbale the AVCS, and other than that it SHOULD be plug and play with old harness and sensors.

Problem with hybrids is they have a tendency to melt the 2.5l pistons around their edges due to the heads being milled for a 2.0
BlazeRex is offline   Reply With Quote
Old 11-02-2011, 06:54 PM   #5
J. Steinbeck
Scooby Specialist
 
Member#: 140575
Join Date: Feb 2007
Location: Hotlanta, GA
Vehicle:
2007 Magnum SRT-8

Default

***ALERT: Some of the following info may be incorrect***

I've been researching this for a bit, as my 02 wagon is approaching the point where engine replacement may be something I need to be ready for.

First off, doing the full 2.5 liter long block swap and getting it all to work is supposed to be a HUGE job. The AVCS, drive by wire throttle, and 32 bit ECU are among the biggest headaches, and my understanding is that you practically have to rewire the whole damn car to get it all going.

If you want the long block and appropriate heads, but don't mind the AVCS not working, it may be like BlazeRex said... not a big deal. I assume you would still need to switch out the throttle body assemblies, which I wouldn't think would be too bad.

And then there's the infamous 2.5 hybrid swap... your 2.0 heads on a 2.5 block. It physically bolts up, and last I checked the price differences between a factory fresh 2.0 and 2.5 long block are negligible. A retune of your existing ECU after the swap is a necessity, though, and the long term reliability of these builds is a mixed bag.

If low costs and reliability are of utmost importance, you may be better off sticking with the 2.0. If the hybrid idea appeals to you, there is technically a "more right way" of doing it. Pick up a 2.5 short block, and then send your heads to these guys:

http://www.eqtuning.com/

They can re-mill your 2.0 combustion chambers to 2.5 specs, so it would be like having a 2.5 with no AVCS or drive by wire to mess with, and your compression ration would be perfectly in spec. Only problem is, it gets expensive quick. I think it is around $700 for the mill work, and if you pull off your heads and discover there are any cracks (which is very possible, especially around the spark plug holes), they won't touch them. I've sat down and run the numbers, and a pair of rebuilt heads that have been reshaped could end up costing as much as the new short block if you have to buck up for new head blanks as well.

Then again, I know some guys who have bolted 2.0 heads straight to the 2.5 block without any modification, and had nary a problem once the tune was done.

Ugh... just thinking about this makes me clutch to my wallet with fear. You've got A LOT of research to do, and you'll have to weigh your options wisely. Good luck.
J. Steinbeck is offline   Reply With Quote
Old 11-02-2011, 09:12 PM   #6
bishops'00RS
Scooby Specialist
 
Member#: 260490
Join Date: Oct 2010
Chapter/Region: MWSOC
Location: Shawnee, KS
Vehicle:
2003 WRX Wagon
PSM

Default

Thanks for the info and options. I'm still up in the air on the 205 or 255 block. It's sounding like the 205 longblock may be the best option. Im not really looking to go serious hp with it. Looking to stay with 275-300hp DD with my 16g turbo upgrade (which is still sitting in a box)
bishops'00RS is offline   Reply With Quote
Old 11-03-2011, 10:13 AM   #7
J. Steinbeck
Scooby Specialist
 
Member#: 140575
Join Date: Feb 2007
Location: Hotlanta, GA
Vehicle:
2007 Magnum SRT-8

Default

I'm kind of surprised no one else jumped in after my last post, as there are a lot of opinions out there on this subject.

If you REALLY think you'll be happy with 275-300 whp, an EJ205 really ought to be plenty for the job. If you think a larger, 18G+ size turbo or 20+ psi of boost might be in your future, you might have some good forged drop-in pistons put in your new short block for good measure. That can be done without splitting the block, but you'll be best off talking to a reputable tuner about your goals and what he thinks is really necessary.

That being said, I'm not sure what all you might have access to up in Kansas, but you might ask around and see if there are any nearby shops that have had good luck with hybrid builds; a properly set up 2.5 hybrid at those power levels could be solid, and would have the benefit of a beefy torque curve compared to the 205. You could get solid high 200whp numbers on a VF39ish turbo without even trying. This is my opinion, but it seems like the faults of the hybrid engines tend to show up when people start pushing power up toward the 350+ whp range- more specifically, the issues with the high compression ratio really become apparent when people hit levels that require more advanced timing, as detonation is really the killer with those things.

As for your trans, you may want to look at the build date on your car. I read somewhere that if it was built after spring of 02, you actually have the wider gears (you would have trans code TY754VN2BA). I'm really not sure whether there were any updates to the five speed trans after 03 that made it any stronger. If your current trans works fine, you may end up going through the trouble and cost to swap for a newer trans that is mechanically identical and offers no real benefit.

Like said, some of the above info is opinion, and some may be erroneous info that I've picked up from God knows where. If any members want to rectify what I've said or chime in, please do. My goals are pretty similar to yours, so I'm all ears.
J. Steinbeck is offline   Reply With Quote
Old 11-03-2011, 10:28 AM   #8
bishops'00RS
Scooby Specialist
 
Member#: 260490
Join Date: Oct 2010
Chapter/Region: MWSOC
Location: Shawnee, KS
Vehicle:
2003 WRX Wagon
PSM

Default

Thanks for the info J. Steinbeck. The number of quality tuners are VERY small in the Kansas city area and that is why, when i have the engine and tuning done, I will likely be bringing it to Cobb in Plano TX. a bunch of my fellow Subaru buddies have either brought their cars there to be tuned or had their engines built and installed there. Plus... its Cobb.

For this car, I am not going to go over 300hp. if and when i get the bug to go bigger power, I will pickup something else to build and drive as my fun track / autox beast. I need / want a fun, reliable daily driver and the bigger the power, the less reliable and feasible it is to drive on a daily basis.

I will probably talk to the guys at Cobb and find out what they suggest but I think that an EJ205 with maybe a few upgraded internals (pistons) and have the transmission rebuild with RA gears (1st - 4th) I should have a solid and fun ride.
bishops'00RS is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wanted: a shop to do a ej255 swap 240kat Mid Atlantic Impreza Club -- MAIC 44 12-20-2009 11:09 AM
Ej20 to ej255 Longblock swap traffic80 Subaru Conversions 4 09-22-2008 04:59 PM
EJ205 TO EJ20K swap?? dukeduster Factory 2.0L Turbo Powertrain 17 11-07-2007 08:52 AM
EJ205 to EJ257 swap Tullin Built Motor Discussion 3 10-29-2007 08:07 PM
tips for USDM EJ205 to JDM EJ205 swap? Chuck H Factory 2.0L Turbo Powertrain 5 09-16-2005 08:37 PM


All times are GMT -4. The time now is 10:18 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.