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Old 11-10-2010, 12:06 PM   #26
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Quote:
Originally Posted by stallion91 View Post
i dont mean to hijack, but im looking to do the SAME thing

except, i was planning on getting Delta cam grinds for my SOHC, and i was going to use the stock EJ257 springs and retainers in my SOHC heads for a 7k RPM rev limit?

from what i gather from this thread tho, i should also machine my heads for bigger valve openings?

@ cdnsigop: i was wondering what type of ECU u were using. u said u wanted to keep costs down, and so do i (lol)
STI springs are too short to use in an SOHC without a large spring seat shim.
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Old 11-22-2010, 12:09 PM   #27
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Ok, I answered my own question....

These cams ROCK with boost. HAULLLLL ASSSSS all the way to fuel cut, 6500 RPM. This is at my current rough base tune at 13-15 psi.

Did I mention it HAULS ASSSS?

I Think Im in love...
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Old 11-23-2010, 09:55 PM   #28
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So what cams did you use?
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Old 11-23-2010, 11:46 PM   #29
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Sounds like he left the stock EJ25D cams in it.
cdn, you can find some early jdm turbo cams to put in those heads down the road when you're ready to up the boost. EJ257 valvesprings and retainers are drop in with those heads, and will help stave off float at your desired boost levels. I would suggest going to shimless buckets as well, once you know what thicknesses are going to be needed for each valve.

Keep up the good work!
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Old 11-24-2010, 11:16 PM   #30
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So what compression are you running now cdn? Glad to hear the car's still hauling ass, you have a rough estimate at what power you have now? (I'm about ready to start my build, as soon as I can extract a broken head bolt ).
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Old 11-25-2010, 08:53 AM   #31
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Quote:
Originally Posted by Storm View Post
Sounds like he left the stock EJ25D cams in it.
Bang on Storm, Cams are EJ25D, DOHC, came on a '99 Legacy Outback (This engine comes from the factory with phase 2 block, and phase 1 dohc heads).

For my intents and purposes, I will be leaving these heads as is, with the cams Im using, until I see signs of float or other crap. Basically, I was looking for bang for the buck here. I am extremely pleased with the results of boost mixed with this setup, the improvement in response/power over the EJ22 with similar or more boost is eye widening... Kinda stupid on the street now lol... Especially with the temp dropping to freezing around here.
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Old 11-25-2010, 09:10 AM   #32
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Quote:
Originally Posted by Jagular1785 View Post
So what compression are you running now cdn?
I believe its around 8.5:1 now. That is with a Phase 2 EJ25 block and crank (52mm rod journals, #5 thrust bearing location) oem EJ257 rods and oem EJ257 pistons and rings, Cometic .051" (1.5mm) MLS headgaskets, and EJ25D shim over bucket heads (not resurfaced).

Quote:
Originally Posted by Jagular1785 View Post
You have a rough estimate at what power you have now?
Im not sure.. I am hoping for 320 HP at the crank at 15 lbs boost but I will have a better idea when I use the Dynolicious app (like a gtec) on my wife's phone. Just gotta get the car weighed...

Quote:
Originally Posted by Jagular1785 View Post
I'm about ready to start my build, as soon as I can extract a broken head bolt .
Good luck! I had 3 broken exhaust studs to remove from these heads before I used them. What I did was weld a nut on each broken stud, and after a few tries, the studs were removed with a ratchet and socket. That only works IF there is some stud/bolt protruding from the deck...
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Old 11-26-2010, 10:33 AM   #33
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Digging the build! I own a '99 legacy outback and would love to have more power.

Sorry to ask a noob question, but are the 257 rods and pistons a direct fit for the crank and bore? Also, do you find the emanage blue to be sufficient for your build?
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Old 11-27-2010, 12:38 AM   #34
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Originally Posted by drewmob View Post
Digging the build! I own a '99 legacy outback and would love to have more power.

Sorry to ask a noob question, but are the 257 rods and pistons a direct fit for the crank and bore? Also, do you find the emanage blue to be sufficient for your build?
EJ257 rods match the phase 2 rod journal size, so as long as you have a phase 2 bottom end, then they will bolt in. EJ257 pistons are the same size bore as the N/A EJ25, and fit like factory with the EJ257 rods.

The Emanage Blue does all I need it too, although it would be nice to compensate for large injectors without cutting the MAF voltage the way it does. It is tricky to get the tune perfect, but with some time and the right monitoring tools, such as wideband air fuel gauge and datalogging software, really good results are possible.
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Old 11-27-2010, 12:11 PM   #35
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Keep up the good work!

Jay
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Old 12-09-2010, 12:43 PM   #36
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I've been running my '96 EJ25 HLA heads with boost, only 11 psi though, for a long time. Years. I don't think those heads are the best but they certainly aren't bad. My low and midrange torque is rediculous. I have only a poor tune using an OBD1 EJ22 ecu with no injector correction so my top end power is nonexistent because the car is so rich, but with a tune that should change. The heads and cams aren't the weakest part of the setup though IMO.
Good luck with your project and keep us updated.
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Old 12-09-2010, 02:37 PM   #37
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I run 23 pounds with a 20g, ej22t with phase 1 dohc heads and stock cams. Only mods were port matching the heads to the ej20k manifold. It gets revved to 6.5K on a regular basis, doesn't seem to care. Runs a hydra ems, dyno tuned to 300hp by Phil at Element.
It probably could be more efficient with another set of cams and higher compression but I'll keep what I have for now.
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Old 12-09-2010, 03:01 PM   #38
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See?? The best responses came AFTER I made up my mind, and came to my own conclusions LOL.. Big boost FTW on EJ25D cams...

I was looking at one of my Emanage blue datalogs from when the 2.5 first went in, 4.96V at the MAF! It was well above freezing that day, and boost was only around 12 psi max... So at 16psi in below freezing temps I must be maxing it out... Anyone know how many G/sec the 22680 AA160 MAF is capable of reading at 5V? This is the stock MAF in the 1998 2.2 and 2.5 imprezas and legacys and many ej20 turbo models...
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Old 01-03-2011, 04:20 PM   #39
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By the way I wanted to add to this that at redline it feels like I am floating the valves on my 96 HLA heads.
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Old 01-04-2011, 02:41 AM   #40
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For anyone who wants this info as reference, Xephyr ran a similar longblock setup as me, very high boost, big turbo...

http://forums.nasioc.com/forums/showthread.php?t=690248

Pay close attention to posts 42, 45, and 49...

BTW, I am now at 17 psi peak, 16 psi to redline. Will be increasing that once my Kenne Bell Boost a Spark is installed hehehe...
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Old 01-13-2011, 12:47 PM   #41
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Quote:
Originally Posted by reddevil View Post
I would not use the stock STI pistons if you can afford the $450 for some forged ones. I have gone through enough of them to actually be taught a lesson hahahahahah.

In fact, as long as the tune is good, the only weak point is the pistons at less than 350-400 whp....
You were right... Anyone with some good forged pistons, stock bore, new or used, for an EJ257?

Stock pistons FTL.
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Old 01-13-2011, 07:59 PM   #42
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Quote:
Originally Posted by cdnsigop

You were right... Anyone with some good forged pistons, stock bore, new or used, for an EJ257?

Stock pistons FTL.
Ugh, carnage?
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Old 01-14-2011, 01:20 AM   #43
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Ringland or worse?
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Old 01-14-2011, 02:10 AM   #44
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Still have to take apart the engine... Burns oil, fills up catch can quick under boost, idles rough, with lower vacuum (~15-16 in/hg), constant misfire codes for cyl 2 and 4, and finally, a smoking oil filler neck.

Looking at Supertech pistons right now, as they seem to be the most cost effective solution, but not to much turned up in my last 24 hours of searching lol!
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Old 01-14-2011, 02:47 AM   #45
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Definitely sounds like leaking serious compression. No nasty knocking or banging? I've got custom wisecos for my little build, ran me 550 shipped. They're due to get here in a week or so, so I can't tell you whether I like them or not.

But I haven't heard of anyone with issues with them other than their circlips failing(Get factory circlips if you go this direction, just to be sure). But the off the shelf EJ257 pistons @ 8.5:1 are 450ish from what I have seen. Here is their catalog.

I'm hoping the piston(s) are just cracked for the block's sake. Fingers are crossed for you!

Good luck!
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Old 01-14-2011, 09:11 AM   #46
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Originally Posted by Jagular1785 View Post
Definitely sounds like leaking serious compression. No nasty knocking or banging? I've got custom wisecos for my little build, ran me 550 shipped. They're due to get here in a week or so, so I can't tell you whether I like them or not.

But I haven't heard of anyone with issues with them other than their circlips failing(Get factory circlips if you go this direction, just to be sure). But the off the shelf EJ257 pistons @ 8.5:1 are 450ish from what I have seen. Here is their catalog.

I'm hoping the piston(s) are just cracked for the block's sake. Fingers are crossed for you!

Good luck!
No knocking or banging, the engine still runs okay, thanks for the info! Im praying the block is okay, otherwise I will be using my EJ22 block, with these heads and rods, and EJ22T pistons...
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Old 01-15-2011, 09:01 PM   #47
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No knocking or banging, the engine still runs okay, thanks for the info! Im praying the block is okay, otherwise I will be using my EJ22 block, with these heads and rods, and EJ22T pistons...
That is good, the piston(s) are still at least in one piece. Have you done a compression test?
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Old 01-16-2011, 06:39 PM   #48
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That is good, the piston(s) are still at least in one piece. Have you done a compression test?
No compression test yet. I dont plan to either. Im going to pull the engine out, remove heads, remove pistons, inspect broken ones, take pics for myself and Nasioc, check bores for damage, order pistons 99.5mm (Mahle Austrailian ADM EJ257 square dish pistons (Thanks theotherguy!!!!!) or Supertech EJ257 pistons. The rest, we will see. Really hoping the bores are good, I do not want to have to bore the EJ25 open deck bores! They are thin enough!
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Old 01-16-2011, 08:14 PM   #49
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I love this thread, just bought a shortblock out of 99 RS that supposedly has 65k on it and a single spun bearing, looks to be a good candidate but it still needs to be broken down, $100

Looking to run this same setup and I'm interested to hear anyone elses opinions on valve/Valve spring/retainer/whatever swap from the ej257 heads to our EJ25D. Planning on rebuilding some heads to swap in with the Sti swapped shortblock. I won't be going for any crazy whp numbers though.
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Old 01-17-2011, 12:29 AM   #50
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No compression test yet. I dont plan to either. Im going to pull the engine out, remove heads, remove pistons, inspect broken ones, take pics for myself and Nasioc, check bores for damage, order pistons 99.5mm (Mahle Austrailian ADM EJ257 square dish pistons (Thanks theotherguy!!!!!) or Supertech EJ257 pistons. The rest, we will see. Really hoping the bores are good, I do not want to have to bore the EJ25 open deck bores! They are thin enough!
Sweet, glad to hear you found pistons. It is definitely easier than what I am doing lol. If it is just a ringland then I would expect you won't have much damage, but obviously we won't know till you get it apart. I have heard of a few people breaking their ringlands on the stock pistons, so I'm assuming this isn't uncommon.
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