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Old 11-30-2008, 10:20 AM   #1
WRX_scott
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Default EJ257 build recommendations

Hey guys whats up? I am currently stationed in Japan and I figured what better time then now to build a motor for my car. The car is in Beaufort, SC and being built by my friend RS Drifter.

So far I have these parts lined up:

EJ257 (Cobb Street block)
06 WRX heads (been told they are AVCS)
Hydra
I maybe forgetting something else.

Future parts:

Kelford or BC Cams. Most likley Kelford 282/276
Valve springs/retainers
Debating on oversized valves (what benefits?)
Pistons/Rods
Spec C manifold
Rotated GT35 or GT40
Hydramist

There will be a 6 speed swap going in during the build as well. I want to retain this car as a partial daily driver. What would you recommend? My goals are 475+ on pump/meth and over 500 on race/meth.

I know I am forgetting a ton of stuff like the little things ie injectors. What size would you all recommend anyways?
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Old 12-01-2008, 02:20 PM   #2
zeropsi
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I see your goals in terms of power, and that you want it to be a partial DD...what about other driving? Do you want a drag car? Road course? Auto cross....all very important.

You can't go wrong with a built 2.5 but I haven't heard much about the Cobb blocks, and aren't sure how good they are. You should get the heads port and polished before you put 'em on as they really don't flow any better than the 205 heads.

Why so large on the cams? I wouldn't go quite that big...Tomei has a nice set called the ProCams, which are 270's, and that would be my choice. The only other ones I'd look at are Kelford or maybe GSC. If I learn more about your goals in terms of powerband, I could give better advice on that. Oversized valves just create more airflow and more power...not a bad idea with quality machine work.

Pistons and rods...honestly, I'd keep the 2.5 stock displacement, as they seem to have less issues that way. I like Wiseco pistons and Carrillo rods personally. Stock crank, if crossdrilled and nitride treated will be perfect. The Spec C manifold will work only with the older non-drive by wire throttle bodies, and are effectively deleted the TGV's, so that's a good choice.

I love 6-speeds, and have one in my car. The only thing I don't agree with is the GT40. I doubt you will like it as a DD. A well setup GT35 will make a ton of power, and still spool relatively well, especially with all the supporting mods. On a streetable motor, I honestly think a GT40 is overkill. Just my $.02 though.
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Old 12-01-2008, 02:24 PM   #3
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+1 for zer0psi recommendations. I also think that you should not go too big of a grind on the cams as it will definitely hurt you on the low end and DD purposes.

You are also gonna need the following:

head gasket (make sure to get the right one for compression purposes; i.e. cosworth, cosmetic, STi/OEM)
head studs
water pump
oil pump
new belts (timing, accessory)
Fuel Pump
Injectors (ask your tuner as to what size prolly 850cc)
Spark Plugs (one step colder)

Also, most likely you won't need oversized valves....it really depends on the lift of the cams, but for most grinds you will not need them.

Last edited by csmithwrx'05; 12-01-2008 at 02:34 PM.
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Old 12-01-2008, 04:14 PM   #4
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Scott, I think you'd be happier with some smaller duration higher lift cams for the DD powerband if you are willing to have a bit rougher idle. I also would say to stick with a 35R for a DD. 40R is just going to be rediculous if you plan to drive around town with it.

I would do a nice oversize valve job and pocket port to open the neck...ported heads won't be needed for a daily driver application.

sounds like a good solid build so long as machine work and assembly is done right. I'd also suggest a full blueprint of the block. Do you have the block already? assuming you bought it used...
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Old 12-28-2008, 12:41 PM   #5
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Yes I was able to pick up the block a few months ago from IA performance. It came out of a customers car. It has some small scoring on one of the cylinder walls that is visible but when you run your finger nail over it your nail does not catch. My friend Larry AKA RS drifter said with a hone the walls of the cylinder will be fine.

What duration do you recommend for cams? I have seen the Tomei Poncams and from what I read in the magazines around here (Japan) they dont have 270 for the EJ257 but I could be wrong.

What about bearings rod/crank? What makes ACL so much better that they charge more then Cosworth? Is it that ACL bearings are rod/crank together, or one or the other?

As far as a builder or machine work I am not sure who is going to put it together as I am not familiar with builders in South Carolina or the MAIC anymore.

Last edited by WRX_scott; 12-28-2008 at 12:47 PM.
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Old 12-28-2008, 02:25 PM   #6
zeropsi
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Quote:
Originally Posted by WRX_scott View Post
Yes I was able to pick up the block a few months ago from IA performance. It came out of a customers car. It has some small scoring on one of the cylinder walls that is visible but when you run your finger nail over it your nail does not catch. My friend Larry AKA RS drifter said with a hone the walls of the cylinder will be fine.

What duration do you recommend for cams? I have seen the Tomei Poncams and from what I read in the magazines around here (Japan) they dont have 270 for the EJ257 but I could be wrong.

What about bearings rod/crank? What makes ACL so much better that they charge more then Cosworth? Is it that ACL bearings are rod/crank together, or one or the other?

As far as a builder or machine work I am not sure who is going to put it together as I am not familiar with builders in South Carolina or the MAIC anymore.
The Tomei Procams (270's) that are available here will work with the EJ257. I'd imagine they're the same, not sure of results though. I was going to pick up a set, but I'm satisfied with the Poncams quite honestly.
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Old 12-28-2008, 02:28 PM   #7
WRX_scott
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What is the difference betweent the Poncams and the Procams?
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Old 12-28-2008, 02:38 PM   #8
zeropsi
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Size mainly, the Poncams are 252/252, and Procams 270/270. I'll have to look up the lift.
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Old 12-28-2008, 02:40 PM   #9
WRX_scott
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Currently I have the Tomei USA site open in another window and can not locate the Procams. Can you provide me with a link.
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