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Old 08-31-2005, 06:01 PM   #1
jdb2300
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Location: Montpelier, Vt
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1998 Subaru 2.5GT
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Question My Frankenstein

I have a 98 Leg 2.5GT DOHC. Wich I believe is the PhaseI engine. I just want one fun a#! subaru to drive. I had an rx-7 and loyal wagon before the Gt. After beating the hell out of the subaru and driving it everyday without many repairs, putting all my money in the RX-7. I decieded to buy a quick Scoob. Got rid of Loyal and RX. I couldn't be happier.

I bombed my Scoob and Joined this club for help. I am now much more proud to drive my Scoob because I think that Suby drivers are the best, down to earth, helpfull people around. I plan on becoming a solid member. Learn what I can about Subes and would like to go to a subaru meet sometime. The help I got from this club already is unbelievable. I used to go to a couple of my friends for help but learned they don't know squat, i already know more than they do, just reading threads.

I read the whole High Compression Frankenstein thread. I have a pretty good clue as to what i'm looking for but still have a couple questions I have to clear up and verify before i go and do something like this. I am also thinking i'm going to put a light wieght flywheel, sport clutch, and lightwieght Mr. Josh pully on it.

I am aware of the loss in gas milage witch doesn't bother me that much.

I would be doing this to my daily driver that i put 20 to 30 thousand miles on a year. Would this be practical and reliable?

Ej22 heads PhaseI or Phase II, Wich exact heads would I need and do i need anything else? Like the intake?

What would I use for timing belt?

What head gasket would I have to use?

Would light flywheel/pully be practical in this setup?

Should I use and OE clutch like or performance clutch? I found an Exedy OE clutch for $145+shipping. IF sport clutch, what would be a good cost effective one?

What flywheels are the best and wich are most cost effective?

What other information should I know to get my High Compression Frankenstein going?

I would like to thank everyone for the help I have already got and Thank everyone in advance for any help you can give me.

Thank You So Much
------------Joe
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Old 08-31-2005, 07:07 PM   #2
poormansporsche
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Welcome man. Congrats on the purchase. You might be able to get away upping the compression a little bit but i would say you prolly want to just get a thinner than stock head gasket. That can get your compression up to around 11:1 or so and won't cost an arm and a leg to do it. For the most part everything stock will work. I wouldn't replace the clutch and fly unless the clutch is going out on you. But if it were I'd get the ACT clutch and fly. The Exedy's tend to have some shudder when cold and can be kind of annoying. I got the ACT clutch with the Exedy fly and it's not that bad but I'd get the ACT clutch again if I could. For more power start with the usual suspects. Cold air intake and exhaust. If you do the light weight flywheel keep the stock crank pulley. If you still want more power maybe port and polish the heads and get some cams and maybe throw in a Cometic think head gasket and you'll be doing good work then. Do not get EJ22 heads they have only one exhaust power where as the EJ25 heads have 2. 2 = better than 1. Always. After it's all done maybe get some tuning with the perfect power or the I-Speed ECU reflash.

check out...
www.techworkseng.com
www.cobbtuning.com
www.rallitek.com
and
www.i-speed.us

hth

cheers

garrett
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Old 08-31-2005, 07:40 PM   #3
EastsideLegacy
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Well..... dont SOME 2.2 heads have the 2 exaust ports ....and while im on the thread where might i find a thinner headgasket ??
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Old 08-31-2005, 08:37 PM   #4
93subi
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yes, the phaseI 2.2 has dual exhaust ports. From what I hear you can't mix heads from different phase motors " thats just what I have heard" maybe it works and someone can help you out more. And I think all the EJ head gaskets run around the same thinkness just with different bore sizes.
Mike.
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Old 08-31-2005, 09:07 PM   #5
jdb2300
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Put a search on High compression Frankenstein and read that thread, there is alot of usefull information there.
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Old 08-31-2005, 10:53 PM   #6
t3hWIT
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Quote:
Originally Posted by jdb2300
Put a search on High compression Frankenstein and read that thread, there is alot of usefull information there.

FYI, he said in the first post that he already looked at that
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Old 08-31-2005, 10:57 PM   #7
The Stig
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Quote:
Originally Posted by mi_cistemz_loudr
FYI, he said in the first post that he already looked at that

He look at the author of the thread..

I believe he was speaking to EastsideLegacy
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Old 08-31-2005, 11:21 PM   #8
jdb2300
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That thread was very informitive. But i'm still a little confused about exactly witch heads will go on my ej25, I think it is the ej22 phaseI heads on my ej25 phaseI. But i don't know what to use for HG's.

Yes I was speaking to EastsidelLegacy. Someone told me to read that thread and now just passing the advise!!!
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Old 08-31-2005, 11:24 PM   #9
jdb2300
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Oh, do you reall think I can get a 11:1 CR with thinner HG's?
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Old 08-31-2005, 11:26 PM   #10
poormansporsche
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I think you can get more than 11.4:1 I don't remember who it was I thought it was Matt Monson that said he was getting 11.4:1 with the Cometic .027" HG. Do a search for Matt Monson and started threads in the NA forums.

cheers

garrett
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Old 09-01-2005, 12:15 AM   #11
Lethargic1
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^^^ Definitely check out Matt Monson's threads. They are very informative.
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Old 09-01-2005, 12:37 AM   #12
93subi
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if you are looking for real high CR's maybe you should see it the EJ 1.8 heads will fit on the 2.5 short block.
Mike
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Old 09-01-2005, 04:05 AM   #13
ballitch
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the EJ18 heads wont flow like EJ22 heads plus that would theoretically yield like 14:1 CR, but use the phase II heads for the 10.8:1 CR, im doing that setup right now, just gotta get the gaskets and timing belt and start throwing it together, you can mix phase I and II blocks and heads together.



~Josh~
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Old 09-01-2005, 12:41 PM   #14
Matt Monson
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jdb2300,
You are going completely the wrong direction here. Your car came with DOHC Ej25 heads. These heads flow substantially more than either type of Ej22 head. To go with Ej22 heads would be going backwards. Compression ratio is not the end all, and without proper cams to take advantage of it, you aren't going to see much gain from a CR bump anyways.

Here's what I would do if it were my car:

Replace the bottom end with a phase II EJ25 block. This will bump the CR a little bit over the phase I block that was in there. Use factory head gaskets for a phase II. You will be in the high 10's CR-wise.

Get some Delta Cams for your heads. This is where your real power gains will be made. If you have all the other supporting bolt ons you will be making +/- 205-210hp. End of story...

And just a sidenote, some interesting information about my set up has recently come to my attention. My CR is far from 11.4:1 More to follow in my own thread later this week...
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Old 09-01-2005, 06:08 PM   #15
t3hWIT
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Quote:
Originally Posted by The Stig
He look at the author of the thread..

I believe he was speaking to EastsideLegacy
oops. my bad
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Old 09-01-2005, 07:23 PM   #16
jdb2300
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Thanks. I'm going to go check into delta cams right now. This is great. Huge $$$ saver!
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