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Old 04-21-2010, 10:40 AM   #1
turbofied
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Default STi 2.5L into 06 wrx

Need some answers ASAP.

I have a 06WRX

06 JDM STI WRX 2.5L Long block

Will it run of a ej255 ecu after a reflash?

Any loom problems from the install Will i use the motor loom of the 06 wrx loom?

Thankyou in advance I searched and all it brought up was a million 257 v 255 debates and no answers on instalation problems.
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Last edited by turbofied; 04-22-2010 at 09:17 PM.
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Old 04-21-2010, 11:35 AM   #2
FuJi K
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What's your interest in them?
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Old 04-21-2010, 11:45 AM   #3
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Quote:
Originally Posted by FuJi K View Post
What's your interest in them?
+12345

I like the +08 EJ257s since they come with the nitrated crank and thicker rods than the <08 EJ257s
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Old 04-21-2010, 11:55 AM   #4
Boxer112
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Quote:
Originally Posted by juanmedina View Post
+12345

I like the +08 EJ257s since they come with the nitrated crank and thicker rods than the <08 EJ257s
Thicker rods sound like a good thing ("thats what she said") but how many motors actually fail because of rod failure alone? from what i've seen, it is usually something else that destroys the rods.

what are benefits of nitrated crank??
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Old 04-21-2010, 12:29 PM   #5
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Quote:
Originally Posted by Boxer112 View Post
what are benefits of nitrated crank??
it looks pretty

The journals themselves aren't nitrated, just the counterweights. (this will start a fight)
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Old 04-21-2010, 12:46 PM   #6
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Quote:
Originally Posted by Boxer112 View Post
Thicker rods sound like a good thing ("thats what she said") but how many motors actually fail because of rod failure alone? from what i've seen, it is usually something else that destroys the rods.

what are benefits of nitrated crank??
I agree there have not been many engine failures caused by bend or broken rods, but why not get the 08+ EJ257 since it cost only 75$ more than the older versions. More cross sectional area is better for rods, it improves their streght.

Quote:
Originally Posted by Bad Noodle View Post
it looks pretty

The journals themselves aren't nitrated, just the counterweights. (this will start a fight)
IDK SOA did it for a reason.

I wanna start a fight. I guarantee that a 08+ shortblock with some nice forged pistons will out last any fully built engine, ACL bearings, nice rods, etc etc etc. at 400whp-600whp

Last edited by juanmedina; 04-21-2010 at 12:52 PM.
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Old 04-21-2010, 12:50 PM   #7
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^ from what I read it was due to environmental impacts of the bearing materials used in the pre nitrated blocks.

Something something stuff is bad for environment, subaru changes bearings, then nitrates crank to work with new bearings.

I've searched for a long time before i bough the non-nitrated crank and that's the best explanation I could find.
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Old 04-21-2010, 12:53 PM   #8
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Quote:
Originally Posted by Bad Noodle View Post
^ from what I read it was due to environmental impacts of the bearing materials used in the pre nitrated blocks.

Something something stuff is bad for environment, subaru changes bearings, then nitrates crank to work with new bearings.

I've searched for a long time before i bough the non-nitrated crank and that's the best explanation I could find.
Do u find anything about the bearing? are they better or worse?
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Old 04-21-2010, 12:57 PM   #9
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Originally Posted by juanmedina View Post
Do u find anything about the bearing? are they better or worse?
don't quote me on this, but supposedly they're "harder" which is why subaru ended up nitrating the cranks, to make them "harder" as well.

Don't quote me on this, it's just what I remember finding.
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Old 04-21-2010, 05:22 PM   #10
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Quote:
Originally Posted by juanmedina View Post
I agree there have not been many engine failures caused by bend or broken rods, but why not get the 08+ EJ257 since it cost only 75$ more than the older versions. More cross sectional area is better for rods, it improves their streght.
And adds to the motor's rotational weight.


Quote:
Originally Posted by juanmedina View Post
I wanna start a fight. I guarantee that a 08+ shortblock with some nice forged pistons will out last any fully built engine, ACL bearings, nice rods, etc etc etc. at 400whp-600whp
I'm also not trying to argue, but I'm curious why you say this Juan? (Not that I disagree with you... )
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Old 04-21-2010, 06:16 PM   #11
Boxer112
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im sitting here trying to learn something.. cuz im trying to start my build within the next year. if i last that long on stock.LMAO
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Old 04-21-2010, 06:26 PM   #12
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OMG Juan's spreading the rod difference out like wildfire.

Juan, WTLY......
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Old 04-21-2010, 09:27 PM   #13
turbofied
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11 posts that don't answer nothing, great!

My interest is they are a straight forward swap with everything on the motor brand new.

Meaning nothing to break or replace for 100Kkms

They are a good price $4K USD brand new!

It will Cost me $4K also for just a new short block with recoed heads.

So for nothing extra i get a new turbo, Intake, cams, big ports, id almost asume different exhaust and up pipe, new alternator, new PS,
New coolant hoses, Vacum hoses. All with 12 months warranty

They come with turbo

They don't need to be opened or touched! OEM build quality. I wont buy one of these then open it up just to install a crank.

I havn't seen a rod fail yet either.

Pistons fail over 300whp thats fine i don't plan on that much HP

I want this motor to have a fat midrange and be fun to drive!

Im not chasing stupid power/ Im not a dyno queen/ I don't relate social status to HP.

I will be happy with the setup the vf43 is a good DD turbo.

Now you know more about me has anyone installed one?
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Old 04-21-2010, 09:44 PM   #14
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talk to grahm at www.japanparts.com
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Old 04-22-2010, 09:17 PM   #15
turbofied
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bump!
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Old 04-23-2010, 10:44 PM   #16
FuJi K
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i fear those heads are not the same as the ones found on the Impreza STi models. Other than that yes it'll work just fine for a long block swap. A couple of things to look at would be the cam sensors and also AVCS solenoids to make sure they fit with your plugs.
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Old 04-24-2010, 03:05 AM   #17
turbofied
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Yeah well last night i printed the USDM sti FSM and the plugs for the cam sensors are the same pin outs and wire colours.

So looking promising until i get the motor out and inspect further
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Old 04-24-2010, 10:00 PM   #18
LatentWagen
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Quote:
Originally Posted by turbofied View Post
06 JDM STI WRX 2.5L Long block
JDM STi = 2.0L, not 2.5...

You have a JDM heads with an 06 USDM STi 2.5 block?
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Old 05-07-2010, 01:46 AM   #19
turbofied
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The engine is coming from subaru japan, But its is a euro long block it seems.

2006 ej257 long block
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