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Old 01-17-2005, 11:43 PM   #1
jey
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Default Turbo Legacy project - 2.2L SOHC heads, EJ257 shortblock, WRX turbo, S-AFC

Due to some stupid driving in the rain I managed to blow my shortblock so now I have an opportunity to replace the shortblock. After discovering all new Subaru shortblocks cost about the same, wheels turned in my head that this is a great opportunity to upgrade and get more power - if I'm shelling out $3200, I might as well get some improvement out of it.

Axis Power here in St. Louis is doing the whole thing - they're going to install an EJ257 shortblock, put in a new oil pump, water pump, machine the heads to make it flat.

The EJ257 will have a low compression ratio that will prevent predetonation - since all I want is some power (200 hp or so) with reliability, we've found a WRX turbo, intercooler, uppipe, exhaust, and fuel pump. Add to that a crossmember from the Subaru dealer and I have a turbo kit for $1000 or so. Oh and one more thing, the Apexi S-AFC to get more fuel into the engine. Axis is, again, installing all this.

It's going in the shop tomorrow - I suppose I'm posting because I've spent some time searching and reading around and I haven't stumbled across anyone who's done such a setup - 2.2L SOHC heads on an EJ257 running a WRX turbo. But since I only want 5-6 psi, perhaps this is a decent way to do a conversion, reliably. Feel free to comment and be skeptical, the more info I get the happier I will be.

I'll keep everyone posted...
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Old 01-18-2005, 12:17 AM   #2
Wedge
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Personally, I'd ditch the 2.2 SOHC for some better ones. I think there were some 2.5 SOHC heads for sale for about $200 on the classifieds.
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Old 01-18-2005, 12:52 AM   #3
White 2.5rs
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yeah deffinately dont get them, its a waste of ur time

alex
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Old 01-18-2005, 01:17 AM   #4
no-coast-punk
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Umm... you are pissing away your money if you only run 5-6psi and use the 2.2 heads. I don't know too much about the 2.2 NA's. Aren't the injectors somewhere in the neighborhood of like 230cc's stock? If the ECU is MAF and you find injectors that are in the neighborhood of 50% larger than stock, there is NO reason you can't do 18psi/300ish WHP daily and have it be totally reliable. If you dig up a set of 2.5 SOHC heads there is NO reason that you can't do 300ish WHP daily. I put down 340 at the wheels on a stock NA MAF ECU with an AFC and large injectors.
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Old 01-18-2005, 03:56 AM   #5
speed_freak27
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As stated above I would find some 2.5 heads. They flow much better. I've got a 2.5 manifold and rc440 cc injectors if your looking for an upgrade in injectors. Good luck with the project.
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Old 01-18-2005, 04:02 AM   #6
jey
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I'm not "getting" the 2.2 SOHC heads... they just happen to be already on my car. Would there be any wiring problems running the 2.5 SOHC heads on my ECU?

I won't ever need 300 whp - for now I'm going to take it easy because I don't have the transmission upgraded to handle anything near that yet.
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Old 01-18-2005, 04:33 AM   #7
speed_freak27
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Never need 300 hp. Sure right ok. There shouldn't be any problem running the 2.5 heads from the 2.2 heads.I believe they are pretty similar with the exception of flow. They also have more aftermarket stuff available for them such as cams/springs,titanium retainers etc. This is for when you want to get into larger hp numbers.
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Old 01-19-2005, 03:11 PM   #8
jey
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Update: 2.2 SOHC heads won't work. Two problems: I bent some valves driving through a water puddle (But that can be fixed). Bigger Problem: Single-port exhaust on the head.

So now we're trying to find some 2.5 SOHC heads and we should still be good to go.

Other things that will have to be resolved
- the WRX intercooler's bypass valve sits right where the throttle linkage is.
- the turbo sits really close to all the wiring harnesses for the intake manifold!
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Old 01-19-2005, 04:16 PM   #9
no-coast-punk
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If you can find a WRX manifold and TB assembly it will solve some of your problems. Another one is to have a block off plate made for the bypass valve and work up an alternate BOV arrangement.
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Old 01-19-2005, 05:29 PM   #10
jey
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Quote:
Originally Posted by speed_freak27
As stated above I would find some 2.5 heads. They flow much better. I've got a 2.5 manifold and rc440 cc injectors if your looking for an upgrade in injectors. Good luck with the project.
Does the stock injector harness plug right into those injectors?
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Old 01-19-2005, 05:46 PM   #11
munkis
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5-6 psi on a 257 is a big waste of money in my opinion. You would be better off picking up a used 2.2T shortblock, the one in my car cost 400 bucks, pick up some used sohc or dohc rs heads..

your gona break that L transmission pretty easily also.

Jay
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