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Old 10-27-2010, 05:32 PM   #1
TBone1987
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Default EJ257 Hybird Swap Need Info!!!

HI I am doing a EJ257 Shortblock swap into my 02 Wrx I need to know what is all going to be needed to do it. I have gathered some info on this on here and some other sites but not shure about everything. so here is what i have so far

EJ257 Shortblock
Cosworth Head Gasket and all other gaskets needed

Thats realy all i know for shur but i have other questions like can i use my wrx cams? do i have to have the heads machined i heard that it will give u a higher compression ratio if i do and my heads look to be almost new. Can i use my wrx oil pump or should i get an sti pump. Whats with the AVCS or somthing i have to plug it off idk?

I am trying to get this done as cheap as possible i found a block for 1800 brand new so i think i will get that unless anyone know where to find one cheaper. I have a 20g turbo 850cc injectors FMIC Walbro 255 and of course it will have to be tuned im only looking to make about 350 hopefully it will be reliable. any help would be great Thanks...
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Old 10-27-2010, 05:42 PM   #2
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Quote:
Originally Posted by TBone1987 View Post
HI I am doing a EJ257 Shortblock swap into my 02 Wrx I need to know what is all going to be needed to do it. I have gathered some info on this on here and some other sites but not shure about everything. so here is what i have so far

EJ257 Shortblock
Cosworth Head Gasket and all other gaskets needed

Thats realy all i know for shur but i have other questions like can i use my wrx cams? do i have to have the heads machined i heard that it will give u a higher compression ratio if i do and my heads look to be almost new. Can i use my wrx oil pump or should i get an sti pump. Whats with the AVCS or somthing i have to plug it off idk?

I am trying to get this done as cheap as possible i found a block for 1800 brand new so i think i will get that unless anyone know where to find one cheaper. I have a 20g turbo 850cc injectors FMIC Walbro 255 and of course it will have to be tuned im only looking to make about 350 hopefully it will be reliable. any help would be great Thanks...
If your using your 2.0 heads you wont have to PLUG OFF AVCS. YOU DONT HAVE AVCS in the 2.0 heads. unless your using STI CAMS. 2nd of all i wouldnt go cheap on a Hybrid build as i would still purchase brand new oil cooler, 11mm oil pump. if you were to get your heads machined to have it fit the 2.5 block chambers then that wouldnt raise your compression ratio as it would lower it to the sti standard compression an you would still be able to use the standard head gasket. Either route you go is your choice.


my 2 cents.... i would do alot more research or ask alot more questions then slapping **** together with a 20g as all it will cause is a headach
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Old 10-27-2010, 07:20 PM   #3
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I plan on buying my block from here http://myworld.ebay.com/john.subieguy/ I have heard nothing but good things about this guy. He has new, Rebuilt & upgraded Blocks as well and oil pumps and some other things.

Good Luck with the build. I will probably start mine summer of '11.
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Old 10-27-2010, 07:40 PM   #4
bradley027
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whats the difference between using a bare ej257 block and a ej25 block for a 2.5 hybrid build?
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Old 10-27-2010, 11:54 PM   #5
TBone1987
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Well i dont want to just slap it togeather but im not trying to push a whole lot of boost or make a huge amout of power, at the same time i want it to last. So if i have the heads machined to mach the 2.5 what all will they have to do? put new valves and all that in? Is there any sites u know of that i could check out that would help me out. I got most of the information but still feel like im missing some things.

Last edited by TBone1987; 10-28-2010 at 12:03 AM.
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Old 10-28-2010, 12:03 AM   #6
TBone1987
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Originally Posted by bradley027 View Post
whats the difference between using a bare ej257 block and a ej25 block for a 2.5 hybrid build?

From what i understand The EJ257 is the block that is in the 04+STI and the EJ255 is the block that is in the 06+WRX not 100% on this tho.
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Old 10-29-2010, 01:29 PM   #7
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Still need info on this anyone know of a good site to look at??????
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Old 10-29-2010, 01:33 PM   #8
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Old 10-30-2010, 02:48 PM   #9
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Good Info Thanks!
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Old 11-01-2010, 01:12 PM   #10
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welcome
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Old 11-01-2010, 05:26 PM   #11
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Get a complete EJ25 gasket kit too
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Old 11-01-2010, 05:29 PM   #12
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You need to go read up in the Built Motor section. There is tons of info over there.

Don't cut corners with a hybrid setup. I know it's extremely tempting because everything literally just bolts right up, but there are a few things that are very important not to look over. I am in the middle of my 2nd tear down of my hybrid motor. I would say the most important thing is to have the heads machined to match the EJ257 bore. This makes it much more reliable, less prone to knock, and is much easier to tune.

Quote:
Originally Posted by Mach V Matt View Post
Get a complete EJ25 gasket kit too
Get the EJ205 master gasket kit, then along with that purchase a set of STI head gaskets. You will also need the rocker cover gaskets and spark plug gaskets.
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Old 11-03-2010, 05:22 PM   #13
TBone1987
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Quote:
Originally Posted by Ryan314 View Post
You need to go read up in the Built Motor section. There is tons of info over there.

Don't cut corners with a hybrid setup. I know it's extremely tempting because everything literally just bolts right up, but there are a few things that are very important not to look over. I am in the middle of my 2nd tear down of my hybrid motor. I would say the most important thing is to have the heads machined to match the EJ257 bore. This makes it much more reliable, less prone to knock, and is much easier to tune.



Get the EJ205 master gasket kit, then along with that purchase a set of STI head gaskets. You will also need the rocker cover gaskets and spark plug gaskets.
What all do they do to the heads to mach the 2.5 block? Can they do that without replacing the valves and decking the head? I know it would be good to do this anyway but my heads were just redone not long ago..
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Old 11-03-2010, 05:28 PM   #14
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They open up the 2.0L heads combustion chamber to match the bore size of the 2.5L cylinder size... this eliminates "head overhang".
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Old 11-03-2010, 09:39 PM   #15
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ok but do they have to put new valves in or can the stock ones be used?

Also will an 08 Sti short block work wit the wrx 2.0 heads?
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Old 11-03-2010, 10:56 PM   #16
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Same valves can be used.

Yes.
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