Subaru WRX Forum

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DesiSuperman 09-18-2006 10:54 PM

Block Swap
Can I put just the EJ257 block with crank, pistons, and rods, onto my current 03 wrx. Will everything bolt right up or do I need anything else? If so what else do I need to do? Also will it affect the transmission?

corncobb 06-24-2007 12:31 AM

Thats exactly what I want to know

piratekiller 11-15-2007 12:17 PM

me too!!

darthsofearu 04-18-2008 11:38 AM

me as well

Jave 04-18-2008 12:00 PM

yes everything is a direct fit. You will need tuning for it and might need a thicker head gasket unless you want to run a octane booster like Torco(no 93 where I live). Bigger than stock turbo would be advisable as well. Transmission will last as long as you dont beat on it like any other mod. I have been running my hybrid for almost a year on the stock tranny.

[url=]Subaru EJ257 STi Shortblock, JSC Speed[/url]

Longshot 04-18-2008 12:31 PM

I love how threads just "continue" even though they were started a year and a half ago.

And +1 to what Jave said.

Jave 04-18-2008 01:08 PM

lol wow I just saw that...

mosc 04-18-2008 01:29 PM

well, darthsofearu wanted to know and he at least did some searching. Got no problem with dragging up old threads if there's a good reason.

TY for info Jave. darthsofearu, the key is using the WRX heads and creating a "hybrid" rather than swapping the whole motor in there. That way you still keep the stock ECU etc and it's easy to just re-tune like you would for most other power mods.

newtothegame 04-18-2008 06:48 PM

Dang Jave, you have been running that setup that long now? I remember when you started it.

darthsofearu 04-19-2008 07:41 PM

wow. oh well. yea, i am keeping the heads and just swapping the shortblock. but what will i need to do with the ecu. will my wrx cobb ap v1 work? thanx guys

nagyhead 04-19-2008 08:46 PM

it will work if you go to a cobb tuner, i dont think they have an OTS map for a hybrid.

Longshot 04-19-2008 10:29 PM

[QUOTE=nagyhead;193295] i dont think they have an OTS map for a hybrid.[/QUOTE]

nah definitely not, he'll need a custom map for sure

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