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Old 05-03-2006, 08:46 PM   #1
wrxfactor
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Default EJ257 longblock, ported WRX heads and larger cams

I posted this in the 2.5L forum, but it might be better here, so...

I am now getting a 2.5L longblock to run with my '02 ECU which will probably be ECUTeked before I drive home in less than 2 weeks. However, when I get home, I'm thinking of swapping the heads with AVCS to my WRX heads, which will get ported and rebuilt with bigger cams, different valves, etc. This way, I won't need more EM to run the AVCS and won't have to deal with switching to DBW, which I don't want to do. Any ideas on what cams I should be looking at? Only looking to make 300-350whp, and I'm stage 2 right now.

Any info on major things I will be needing please post them here, thanks
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Old 05-04-2006, 12:27 AM   #2
flwrx
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damn bro....posted this in subaru conversions, built motors, and 2.5?? lol geez

I personally wouldnt go to those lengths for 300-350whp goal. Built heads are not cheap and pretty unnecessary for your goals. Id just get stock sti cams if anything and save the money.
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Old 05-04-2006, 12:45 AM   #3
railguy
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I dont think you can run avcs on wrx heads..........
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Old 05-04-2006, 12:57 AM   #4
wrxfactor
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Quote:
Originally Posted by flwrx
damn bro....posted this in subaru conversions, built motors, and 2.5?? lol geez

I personally wouldnt go to those lengths for 300-350whp goal. Built heads are not cheap and pretty unnecessary for your goals. Id just get stock sti cams if anything and save the money.
Yeah I'd like to get a feel before I have the car back, and this area really doesn't get all that much traffic. Anyways, my WRX heads need to be rebuilt, and my ECU won't handle AVCS, so it's one or the other. AVCS will require standalone or a painstaking ECU swap, or it can just get ECUTeked if I do the headwork on my WRX heads. Option 2 sounds better to me, but option 1 will give me more area under the curve.
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Old 05-04-2006, 12:58 AM   #5
wrxfactor
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Quote:
Originally Posted by railguy
I dont think you can run avcs on wrx heads..........
No you can't, but I have an '02 WRX ECU and wouldn't run AVCS if I did the headwork...see where I'm going with this?
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Old 05-04-2006, 01:33 AM   #6
legacy2003
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you can use sti cams in wrx heads

that's what i did for a while. same boat. 257 block, rex heads, and i used usdm sti cams in the rex heads... just seal off the ends of the cams to block the avcs stuff since it won't be there anyway. if you don't oil will just leak out and all over your timing belt. they are a perfect fit; no modification to the head itself is necessary, and they do run a slightly more aggressive profile.

i also like the looks of the new helix cams.

with that setup and a nice big snail you can make over 300whp. the guy that owned that motor before i did made 330whp 350tq on a dynojet using a pe1820 clone.

either way, you're going to like the setup. it's nice and has torque for days.
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Old 05-04-2006, 02:17 AM   #7
keaniegenie
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see my post for your thread on the 2.5l forum

Getting a stand alone ecu is painstaking at all. Phil at Element Tuning will program the unit and walk you through it. With his support, it's simply the best em out there.
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Old 05-04-2006, 09:33 AM   #8
MY99 2.5GT
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You should be able to make 300-350 by only doing the block swap, using stock wrx heads, and upgrading bolt ons. Why do you say "Anyways, my WRX heads need to be rebuilt"?

Did you dump a valve or something? Or are you just saying you want to rebuild them to get more performance?
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Old 05-04-2006, 10:29 AM   #9
wrxfactor
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Quote:
Originally Posted by MY99 2.5GT
You should be able to make 300-350 by only doing the block swap, using stock wrx heads, and upgrading bolt ons. Why do you say "Anyways, my WRX heads need to be rebuilt"?

Did you dump a valve or something? Or are you just saying you want to rebuild them to get more performance?
A cam bolt broke, damaging the cam and cam gear. When the dealership wanted $1700 to fix this on a 90k motor needing a timing belt and water pump on top of that, I said F it and got a virtually new longblock. Originally got a JDM but had unforeseen problems and am now getting a 2.5L longblock. I figured I could sell the AVCS heads to fund the build of the WRX heads.
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