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Old 07-04-2012, 03:04 AM   #1
shovelhead
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Cool ej205 & ej255 parts interchange?

i currently have a spun bearing in my ej205 04 subaru and i recently bought an ej255 06 new short block! i was wondering if everything interchanges?
i appreciate any insight thanks!
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Old 07-04-2012, 04:20 AM   #2
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Why would you purchase a new block, THEN after you buy it..... as this question??!!

hope you did youre homework on hybrid swaps...... if not youre in trouble.

Last edited by UK-Wagon; 07-04-2012 at 04:37 AM.
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Old 07-05-2012, 04:36 PM   #3
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it is a turbo ej255 short block and did some home work says everything should bolt up
i just was wondering if there was anything else i should know about this type of build
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Old 07-05-2012, 07:35 PM   #4
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The cr ratio is gunna b high so u should cnc the heads to make things work, also thicker gasket, other than that ur all set . O ye theres that thing called tuning ur gunna need
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Old 07-23-2012, 12:09 AM   #5
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Quote:
Originally Posted by wrxstage2 View Post
The cr ratio is gunna b high so u should cnc the heads to make things work, also thicker gasket, other than that ur all set . O ye theres that thing called tuning ur gunna need
info needed
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Old 07-23-2012, 12:07 AM   #6
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oem ej257 head gaskets good? im sort of new to this hybrid setup
im gonna port match the heads. i may have to change pistons to get the right compression some say cnc?
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Old 07-23-2012, 12:12 AM   #7
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I used sti headgaskets and just cleaned up my heads. You don't need a cnc unless you want crazy boost and timing. My tuner preferred the bump in compression for off boost torque and said my setup would love e85. Just my experience.
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Old 07-23-2012, 12:17 AM   #8
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every time i read most of these threads i never see the ej255/ej205 hybrid build
its always the ej257/ej20 i appreciate any and all info thanks
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Old 07-23-2012, 12:18 AM   #9
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oh yeah whats cnc?
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Old 10-24-2012, 02:44 PM   #10
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Quote:
Originally Posted by shovelhead View Post
oh yeah whats cnc?
computer numeric control
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Old 07-23-2012, 02:13 PM   #11
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Quote:
Originally Posted by shovelhead
every time i read most of these threads i never see the ej255/ej205 hybrid build
its always the ej257/ej20 i appreciate any and all info thanks
I researched both a lot. The difference is the compression ratio will be around 8.6:1 with sti headgaskets on a 255/205 and the CR will be 8.8:1 with a 257. Ask most people and they will say they are basically the same block but idk that .2 count isn't a big change but definitely makes a difference.

Quote:
Originally Posted by shovelhead
oh yeah whats cnc?
cnc is a machine. When talking about hybrid builds and cnc'ing the heads, were talking about portmatching the combustion chambers to properly lower the CR. I didn't do that. I wasn't looking for 40 psi on a rotated kit. I just wanna make like 360whp on e85. I love the off boost torque I have now. Just make sure you get a good tuner.
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Old 07-23-2012, 03:21 PM   #12
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thanks that helps out alot
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Old 07-24-2012, 10:46 PM   #13
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should i run my stock injectors or after market?
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Old 07-25-2012, 01:21 PM   #14
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Quote:
Originally Posted by shovelhead
should i run my stock injectors or after market?
What are your plans/setup once the motors in? You will need a tune so I vote do the injectors while the engines apart...its a bitch and a half to do it with the engine in the car thanks to the GBODs.
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Old 07-28-2012, 02:36 AM   #15
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well at the moment ive just been trying to get all my parts ahead before i even start the build i want to make sure i have everything i need i hate searching for parts. i think it will be a great experience and allow me to learn more about these Subaru engines

thinking about rc 1000cc injectors
arp head studs
port the heads
i currently have a stock turbo
perrin manual boost controller- i dont think i shoud use it though
i have a godspeed 3" turbo back to a 4" outlet
thought about electronic cut out
a competition stage 2 Kevlar racing clutch
injen cold air intake
hks turbo timer
greddy rs bov
cobb acess port
good tuning
any other insight on what i may also need?
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Old 07-31-2012, 02:04 AM   #16
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A bigger than stock fuel pump will be required.
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Old 08-15-2012, 12:54 PM   #17
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Impreza WRX STi

bumpski
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Old 08-15-2012, 09:14 PM   #18
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I have 2004 WRX and currently running 06 EJ25 in it. EVERYTHING will bolt up the same way.

Few things to consider: EJ25 heads have AVCS setup and 2 cam positioning sensors, one on the back of each intake cam. EJ20 has one cam sensor in front of driver side intake sprocket. You need to modify your EJ25 head to use EJ20 sensor http://elementtuning.com/technical/ej25_install.htm
06 uses electronic throttle body so you'll need to reuse your intake manifold
You can use your existing wiring harness and ECU as long as you make cam sensor mod. Otherwise you'll have to buy 06 ECU with complete harness and immobilizer.
I have no issues with mine running it with completely stock 05 ECU. Yes, you'll need to tune it for larger displacement but its pretty safe as it is.
Let me know if you have other questions, I just finished messing with mine a few days ago
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Old 09-13-2012, 06:47 PM   #19
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Quote:
Originally Posted by TheDuc View Post
I have 2004 WRX and currently running 06 EJ25 in it. EVERYTHING will bolt up the same way.

Few things to consider: EJ25 heads have AVCS setup and 2 cam positioning sensors, one on the back of each intake cam. EJ20 has one cam sensor in front of driver side intake sprocket. You need to modify your EJ25 head to use EJ20 sensor http://elementtuning.com/technical/ej25_install.htm
06 uses electronic throttle body so you'll need to reuse your intake manifold
You can use your existing wiring harness and ECU as long as you make cam sensor mod. Otherwise you'll have to buy 06 ECU with complete harness and immobilizer.
I have no issues with mine running it with completely stock 05 ECU. Yes, you'll need to tune it for larger displacement but its pretty safe as it is.
Let me know if you have other questions, I just finished messing with mine a few days ago
im not going w/ej255 heads putting ej205 heads
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Old 09-13-2012, 07:12 PM   #20
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i keep you posted
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Old 09-16-2012, 02:21 AM   #21
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what year and size sti head gasket should i use 1.5 1.3 ?
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Old 09-16-2012, 02:31 AM   #22
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.020 .030 .040 .050 .060?
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Old 10-05-2012, 10:30 AM   #23
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any who
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Old 10-24-2012, 01:06 AM   #24
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help!!
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Old 10-24-2012, 12:20 PM   #25
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I'm doing a hybrid build also and y tuner recommended the .051 cometics just to lower my compression a little bit since I'm using 8.9.1 pistons in my build but I would just contact your tuner and see what would be easier and better for him
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