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Old 03-05-2013, 11:46 PM   #1
ytt49
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Default 2006 wrx non Sti engine question

I blew my engine last week and am looking for a replacement but have a few questions. Yes I have used the search for two days and I still dont have my answer.The car is a 2006 wrx non sti
the vin# is JFI GD796XXXXXXXXXXX
my question is the 6th digit? Mine is a 7 and I have read that the 7 is for the sti ? So do I need to look for a EJ257? or something different.
so if this has been gone over but I have looked.
thanks in advance.
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Old 03-05-2013, 11:58 PM   #2
Uncle Scotty
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d000000000000000d....yew kneed any motor out of any 06 or 07 wrx to be a straight swap

you can MAKE almost any other engine made by subaru since about 1990 WORK if you want to take the time(and $$$) to do it

any of the pre 08 2.5 turbo motors that are dbw will be less hassle than other engines

this isnt really complicated unless you want to make it so
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Old 03-06-2013, 12:09 AM   #3
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I know the 06-07 is direct bolt but I can seem to find a low mileage one.
So I was going to buy a long block and that's why the vin is kinda messing me up. Some people are saying I need the sti because the 6th digit is a 7 and some are saying it is a non sti.
When I Google the info on the vin I saw that the car is a Japan car not us but the engine portion I saw both ways.
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Old 03-06-2013, 12:46 AM   #4
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Dude just order a EJ257 and use your heads unless your heads a fudged...
EJ255 and EJ257 are the exact same thing from what i understand the 257 compression may be a little different but it will bolt in just fine
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Old 03-06-2013, 01:18 AM   #5
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it seems that this may be beyond what you will be able to do yourself

farm it out to a good shop...there are several in scic
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Old 03-06-2013, 11:11 AM   #6
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Quote:
Originally Posted by Jkmaynard View Post
Dude just order a EJ257 and use your heads unless your heads a fudged...
EJ255 and EJ257 are the exact same thing from what i understand the 257 compression may be a little different but it will bolt in just fine
Thank u
That's all I was asking
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Old 03-06-2013, 12:38 PM   #7
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Correct...the EJ257 short block uses lower compression pistons for the higher boost STi
8.3:1 vs 8.5:1(WRX) I think.

In theory, the EJ257 short block will allow you to run higher boost, but with a slight loss in the low end.

Do reuse the heads. The 06/07 heads have the EGR/Air Pump ports built in. If you eliminate the EGR system, then the earlier 04/05 DOHC 2.5 turbo heads will work.
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Old 03-06-2013, 02:22 PM   #8
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His compression will change slightly but not enough to mean much i just got done swapping heads on from my buddys ej255 onto a ej257 took it to cobb see if it needed to be retuned they said nope they do it all the time
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Old 03-06-2013, 02:31 PM   #9
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Perfect thanks huys
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Old 03-06-2013, 02:33 PM   #10
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* guys
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Old 03-06-2013, 03:01 PM   #11
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Quote:
Originally Posted by donkey_cart View Post
Correct...the EJ257 short block uses lower compression pistons for the higher boost STi
8.3:1 vs 8.5:1(WRX) I think.

In theory, the EJ257 short block will allow you to run higher boost, but with a slight loss in the low end.
That's all incorrect. Yes the entire EJ257 runs lower compression than the entire EJ255, but that's because of the heads. The EJ257 pistons are actually HIGHER compression than the EJ255 pistons. Slapping 255 heads on a 257 bottom end will cause you to run even more compression than either of those engines do stock.
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Old 03-06-2013, 03:02 PM   #12
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Quote:
Originally Posted by Jkmaynard View Post
His compression will change slightly but not enough to mean much i just got done swapping heads on from my buddys ej255 onto a ej257 took it to cobb see if it needed to be retuned they said nope they do it all the time
Are you sure you told them correctly? Sticking 255 heads on a 257 will raise the compression from 8.2:1 to closer to 8.8:1. I would CERTAINLY get it checked out to make sure there's no knock.
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Old 03-06-2013, 03:07 PM   #13
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Quote:
Originally Posted by ytt49 View Post
I know the 06-07 is direct bolt but I can seem to find a low mileage one.
So I was going to buy a long block and that's why the vin is kinda messing me up. Some people are saying I need the sti because the 6th digit is a 7 and some are saying it is a non sti.
When I Google the info on the vin I saw that the car is a Japan car not us but the engine portion I saw both ways.
Ignore the VIN, and just go ANYWHERE and buy ANY 04-13 WRX or STi short block. Other than the pistons (and the nitrided crank that was introduced in...09?), they're all identical. Make sure you take your 255 heads into account when looking at compression numbers or it could end up much higher than you expect. You should be able to pick up a brand new OEM short block for around $1800, or a new built short block for around $2500-3000.
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Old 03-06-2013, 07:55 PM   #14
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Thanks again for all the good info.
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Old 03-06-2013, 07:58 PM   #15
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Quote:
Originally Posted by the suicidal eggroll View Post
Ignore the VIN, and just go ANYWHERE and buy ANY 06-13 WRX or 04-13 STi short block. Other than the pistons (and the nitrided crank that was introduced in...09?), they're all identical. Make sure you take your 255 heads into account when looking at compression numbers or it could end up much higher than you expect. You should be able to pick up a brand new OEM short block for around $1800, or a new built short block for around $2500-3000.
......
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Old 03-06-2013, 08:11 PM   #16
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thanks Uncle Scotty for the fine tuning.
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Old 03-07-2013, 10:57 AM   #17
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Quote:
Originally Posted by Uncle Scotty View Post
......
Thanks. I meant to throw "2.5L" in there, since the 04-05 STi blocks will still work, but missed that part.
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Old 03-07-2013, 04:43 PM   #18
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Here is a good source to clear up any confusion:
http://forums.nasioc.com/forums/show....php?t=1667168

Quote:
EJ257 pistons on B/V25 STi head: 8.28:1
EJ257 pistons on D25 WRX head: 8.78:1

EJ255 pistons on B/V25 STi head: 8.11:1
EJ255 pistons on D25 WRX head: 8.55:1
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Old 03-07-2013, 08:35 PM   #19
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Quote:
Originally Posted by the suicidal eggroll View Post
Thanks. I meant to throw "2.5L" in there, since the 04-05 STi blocks will still work, but missed that part.
and lets not forget the fxt and obxt have a 2.5T too
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