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Old 12-30-2012, 06:19 PM   #1
eatmybunnies
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Default Subaru WRX EJ257 Engine build from scratch

Hey guys,

Hate to be that guy, but it has to be done.

First post here and might be a long one. I have always been interested in trying to build my own engine so i took a look at the ej257 for the subaru wrx.



First of all, does a shortblock need 2 heads? Not sure if a head goes on each side or what not.

O btw i know close to nothing about engines so any input would be great.

Second of all where do i even start? Did some research and i got to this site:
http://www.pandlmotorsports.com/osCo...roducts_id=509

So that is the short block for the EJ257, now i need a header(or two?) for it as well i assume? Where do i get those?


Overall lets say i want to buy that shortblock from the link^ What else am i going to need to get it into full engine mode :P

So starting with the block i found a website that kinda shows me what i need for it.
http://realstreetperformance.com/sto...your-block-71/


Then the head
http://realstreetperformance.com/sto...-your-head-72/


Im guessing i need a intake, exhaust and other things as well.
Then adding a trubo
Then an engine cooler.


Then while writing this post i found this one:
http://forums.nasioc.com/forums/show....php?t=2284412


And o hot dam that is a lot of parts.


So if i want to buy a Subaru wrx does it matter how many miles it has on it?
Because if i want to swap the 205 to a ej257 i should probably look for a cheap car? Definitly over 100k miles on it?

Then how should i even approach this matter? I have some relatives who own a shop so i can probably get some access to equipment for a good discount. I want to build the engine myself though, and then get them to check it and install it and ect.

So is there a checklist for all the parts or something?

Again i am just starting out so i really know nothing.
I am trying to get 300-400 whp car.

Also how much money in total will it cost for all the parts for the ej257?
Then how much for the installation?
Also what a good place to look to buy cars? I live in PA near Philadelphia if it helps.
Looking for a 02 Subaru wrx.


This is a long term project so not expecting anything to happen overnight. Over the next 5 years i would like to get all of this done, and paid for and ect.

Any advice, links, guides, manuals anything really will help.


Also could i use parts from the 205 into the 257 to save some money? Which parts? and all that good stuff.


I probably missed a lot of things so might be revising this post.


Thanks a lot guys.
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Old 12-30-2012, 06:47 PM   #2
imac6471
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Search for Unabomber's manifesto. That will give you a ton of useful info espicially if you say you dont know a lot

Edit: heres the link

http://forums.nasioc.com/forums/showthread.php?t=533787
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Old 12-30-2012, 07:39 PM   #3
sc00by4life
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to be honest......with a post like that, its pretty clear how green you are to this.

instead of trying to build your own motor, pay for a reputable builder to do it for you. it is very easy to create a $10,000 pile of scrap metal if you do not know what you are doing.
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Old 12-30-2012, 07:56 PM   #4
eatmybunnies
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Quote:
Originally Posted by sc00by4life View Post
to be honest......with a post like that, its pretty clear how green you are to this.

instead of trying to build your own motor, pay for a reputable builder to do it for you. it is very easy to create a $10,000 pile of scrap metal if you do not know what you are doing.


:P I agree, but the whole point is to try to do it myself. Ofc I will get some professional help before even starting to build it. One of my relatives is a mechanic and owns a shop, so I will definitely go to him first.

But like i said, i want to do as much as i can myself, clearly it will take me a while, but i am sure i'll get the hang of it.
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Old 12-30-2012, 07:57 PM   #5
eatmybunnies
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Quote:
Originally Posted by imac6471 View Post
Search for Unabomber's manifesto. That will give you a ton of useful info espicially if you say you dont know a lot

Edit: heres the link

http://forums.nasioc.com/forums/showthread.php?t=533787
Exactly what I was looking for, thanks man. Good place to start
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Old 12-30-2012, 08:03 PM   #6
CanadianImprezaSTi
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From your post, all I can recommend is not doing it yourself unless you do a ton of research and have someone who has built engines before help you.

The last thing you want is to spend thousands of dollars on parts only to have it fail right away or just down the road.

Either way you go, good luck with it and make a documented build.
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Old 12-30-2012, 08:07 PM   #7
rdieder
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hang out in the built motor forum if you want to learn about motor components.
If your goal is 300-400 whp, you might as well look into a used 04+STi rather than swapping out a ej205 out of a 02wrx . You will have to merge the wiring harness from a 32 bit car into the wrx to get avcs to work.

Or you can do the frankenstein option of building a 257 hybrid with 205 heads to avoid the wiring nightmare if you really want the exercise of building a motor.
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Old 12-30-2012, 08:07 PM   #8
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You lack focus. From what little I read of your post you want to buy a car then make it have 9000HP and travel at the speed of light and want to know ever step in-between automotive finance to quantum mechanics. Start with step 1. Buying the car. Once you get over that hill, then progress to step 2. We cannot possibly explain all the trials and tribulations between buying a car and making it so fast it travels back in time. Break it up and solve the answers to each step. Start by reading the Unabomber's Manifesto at the top of this forum for parts that are applicable, then asking fine tuned questions as they arise in your progression.
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Old 12-30-2012, 08:18 PM   #9
eatmybunnies
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Quote:
Originally Posted by Unabomber View Post
You lack focus. From what little I read of your post you want to buy a car then make it have 9000HP and travel at the speed of light and want to know ever step in-between automotive finance to quantum mechanics. Start with step 1. Buying the car. Once you get over that hill, then progress to step 2. We cannot possibly explain all the trials and tribulations between buying a car and making it so fast it travels back in time. Break it up and solve the answers to each step. Start by reading the Unabomber's Manifesto at the top of this forum for parts that are applicable, then asking fine tuned questions as they arise in your progression.

Agreed, but before buying the car, I want to research everything first. 9000hp? is that even possible :P a car more than 700 hp is undrivable, you wont have control in any turns.

300 hp is very reasonable tbh.

Thanks for your advice though
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Old 12-30-2012, 08:22 PM   #10
eatmybunnies
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Quote:
Originally Posted by rdieder View Post
hang out in the built motor forum if you want to learn about motor components.
If your goal is 300-400 whp, you might as well look into a used 04+STi rather than swapping out a ej205 out of a 02wrx . You will have to merge the wiring harness from a 32 bit car into the wrx to get avcs to work.

Or you can do the frankenstein option of building a 257 hybrid with 205 heads to avoid the wiring nightmare if you really want the exercise of building a motor.
Yea i actually looked at that post. frankenstein hybrid thing.

This is exactly the kind of things i would like people on this forum to point out to me.

Yes i do want 300 hp and getting an 04 sti might be a better option rather than building a whole new engine.
I will definitely look into it, but i do want to do some work by-myself on the engine itself, know the car inside out, but for now im only researching.


Thanks a lot man!
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Old 12-30-2012, 09:02 PM   #11
Loyale93
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Just a thought. but if you're looking to learn by doing. and are more interested in the final outcome through the build, why not start with not a WRX? start with a GC body RS. way way cheaper to buy the chassis and starting point.

But honestly, if you don't even know how many heads your motor needs, and haven't looked into wiring harnesses... This is going to be a long build for you...

Good luck though.
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Old 12-30-2012, 09:28 PM   #12
BIGJBEARS
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If you want to learn how to build engines do a chevy 350 or some lsx. Caprices are around cheap enough and can put down some good power. If you just want to learn to work on cars buy any wrx or sti with over 150k im sure it will keep you plenty busy with repairs
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Old 12-30-2012, 09:32 PM   #13
eatmybunnies
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Found some manuals for a bunch of stuff


Thought i would share

Last edited by Unabomber; 12-31-2012 at 06:18 AM. Reason: He thought wrong
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Old 12-30-2012, 09:36 PM   #14
eatmybunnies
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Also a nice video of a ej205 rebuild.

As far as i have read, ej205 and 257 are very similar in build types.
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