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Old 01-10-2004, 01:45 PM   #1
O1LegacyGT
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Question STI question-newbie

Not sure if I am posting in the correct forum, but i am a past ford boy trying to get into something new, I have a few questions about the sti and my car and if what i want to do is possiable.

I have a 01 legacy gt limited edition- I believe it has a ej25 motor in it but i am not possitive- i know it is a 2.5 liter boxer engine. My questions are:

1) Is the EJ25 engine the same one as the sti, I heard it is but different heads-compression wise etc.

2)Will a sti manifold work on my car as well as the turbo?
a. Has anyone tried this before?
b. Can i use the sti exhaust as well?

3)Is this a good idea, if no one has done it, i am stil the first to give it a attempt. Please dont flame just help if you want to


thanks
Raini
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Old 01-10-2004, 02:01 PM   #2
humenikp
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1) no
ej257 - sti - semi-closed eck
ej25 phase 2 - open deck

2) don't know (maybe with a little fabrication)
a) no i haven't
b) no the length of the legacy is longer than an impreza

3) i have a 98 outback (phase 1 ej25) so i've been here before
- n/a compression is much higher than that of a forced induction
- you'd need to run very low boost unless you modify rod length. cams would be a good investment

if you want a great place to start check out

http://www.cobbtuning.com/

in particular

http://www.cobbtuning.com/tech/sohc/index.html
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Old 01-10-2004, 02:19 PM   #3
O1LegacyGT
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I have heard that cams for the 2.5liter can add up to 20hp, is that true? How hard is it to swap the cams compared to a v8, i have never worked on a subaru
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Old 01-10-2004, 05:11 PM   #4
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Quote:
Originally posted by O1LegacyGT
I have heard that cams for the 2.5liter can add up to 20hp, is that true? How hard is it to swap the cams compared to a v8, i have never worked on a subaru

I've never done these, but anything around the heads of the boxer is a PTIA. The Impreza and Legacy are easy cars to work in, but the heads are hard, just a disadvantage of the flat layout.

Subarus are extremely easy to work on. "Rally Heritage" to me means, more than anything, that the cars are easy to work on. One of the advantages of having a car chassis designed for the WRC is that it's extremely easy to work on. There are no bad wrench spots on the Impreza, and the Legacy platform is 90% Impreza. Another thing you'll notice, is that the car is 95% held together by either 10, 12, or 14 mm bolts. As long as you have those three sockets handy you can work quickly.

What do you want to do with your car? Add power? If so, how much? Add handling? If so, how extreme?

One of my favorite expressions is; "If you want a faster car, buy a faster car. It will cost less." If you want to add less than 50 HP or so, then your current car is fine. However, if you're thinking about going for 400 HP and turbocharging the hell out of it then it would be cheaper to buy a WRX or STi.

Is your car a 4 speed automatic or 5 speed manual? The 5 speed manual is weak and will have a serious chance of breaking whenyou get enar 300 ft-lbs of torque. The STi's 6-speed will take 400 ft-lbs + without question, it's a completely different and much beefier transmission than the 5 speed.

Good to have another enthusiast aboard.
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Old 01-11-2004, 12:07 PM   #5
O1LegacyGT
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It has a 5spd, as far as modding the car, i like the current handleing as is, I hate when people lower these cars. How ever i wouldnt mind maybe upgradeing the swaybars... But i would like a little more power i know it is capable of more, The only thing is i was a mustang man and those parts are cheap, i just cant justify spending 600 dollars on cams if they are not going to help all that much- I am not expecting it to be ripping z06 vettes or modded stangs just to hold up to its own class. I know subarus are not drag cars and i am not intending it to be.. But a little more power would be great--Personally a little more mid power would be great. As far as the trans the car has a warranty up to 60k so i dont think it will be all that big of a deal. But I want parts that i can easily swap out to go back to stock and i noticed that every company for subaru parts requires a core exchange for cams... Is there a company that doesnt require it or is that going to be hard to find, Also is there a website where it shows a cam swap so i can know what i am getting myself into before doing it. I am almost 100% sure that it will be easier then any v8 =)


thanks Guys
I would pefer to do it right

What are a good set of cams with out haveing to modify anything else, as far as i would like to go if i dont do turbo would be headers-exhaust and cams
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Old 01-13-2004, 11:19 AM   #6
humenikp
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"also is there a website where it shows a cam swap so i can know what i am getting myself into before doing it."

http://techinfo.subaru.com/html/index.jsp

you can purchase the shop manual in pdf form for $20!

although it is an individual download per file , so if you don't have broadband, you might want to find someone who does, or you could pay $600 for all of the goodies on cd.

"i am almost 100% sure that it will be easier then any v8" =)

well... not quite. you'll need to remove the heads for proper [non-hack] installation. removing heads is not as easy as you think. check out the shop manual for more details.

remember subaru's are h not v, and there's not much room to be fiddling around in the engine bay. corn-picker was definately right.

as for the core charge, you don't have to return your cams, you just won't get the core refund then. as for cams i prefer cobb, but there are plenty of others out there. check out a few you like and post in the n/a forum and see what people have to say

one final note...
you are working with an h4 not v8. you'll never be close to those stangs, but you'll still pay the $$ for parts none-the-less. the days of getting 10-15 hp from a cone filter are gone, as an example. 4-5 from a cone filter is more realistic, there just isn't the engine volume to move as much air. it tooke me a while to realize that fact with my outback, but i finally did, and saved up for something better.

if you want to know what subaru's are capable of, stop by your subaru dealer and test-drive and sti.
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Old 01-13-2004, 12:31 PM   #7
stimpy
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You don't have to remove the heads to do a proper cam installation. I installed them on my RS with the engine and heads still in the car. Search around on here and you can find my cam installation instructions as well as the Cobb cam instructions.

It looks to me like you need to spend some time digging around in the Naturally Aspirated forum.

-Jon
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Old 01-23-2004, 12:29 AM   #8
O1LegacyGT
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Thanks alot everyone
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