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Old 04-06-2001, 01:06 PM   #1
HydeX
Scooby Newbie
 
Member#: 2497
Join Date: Sep 2000
Location: www.rs25.com
Vehicle:
2001 2.5 RS
Blue Ridge Pearl

Question question about turbos

I have a 2001 rs and I'm thinking about turboing it. Just a few questions to ask. What are some of the good turbo kits out there for the impreza? Whats the reliability of the car after this I mean will it break down alot? Is a 2.5L engine suitable for turbo? And about how much HP can I gain from this. Sorry if this sounds like a newbie question but I really need help on this. Thanks guys
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Old 04-06-2001, 01:27 PM   #2
stimpy
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This topic has been covered to death in just the past few days. Take some time to do a search in the turbo powertrain as well as the na powertrain and you shall find tons of information.

-Jon
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Old 04-06-2001, 01:34 PM   #3
DLC
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Newbie Tip: Search before you ever ask a question. Read through every possible thread till your eyes sting and your brain hurts.

Then ask educated questions so people won't scream at you
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Old 04-07-2001, 11:27 AM   #4
Danny5
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Location: Surprise, AZ
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2014 Chevy Cruze
Diesel

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heh - you guys are so funny. Unfortunately, the impreza boards drop messages faster than a baby soils its diapers.

I just felt I should chime in for a moment here, because I have been doing searches on this very topic the last week or so. Unfortunately, if you try to pull up any document older than December of 2000, then you get a page not found error.

So instead of flaming every person that comes along and asks this question, why don't you at least point out some worthwhile threads. Quite a few of us would probably find that rather enlightening.

-Dan
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Old 04-07-2001, 02:28 PM   #5
ottos
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Join Date: Mar 2001
Location: westland, mi
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yeah really. Even if this topic has been covered what's the harm in giving out this knowledge again, but with your own words?

Oh, that's right, forgive us. As knowledgable as you are about 2.5L turbos, you can't be bothered with answering such "newbie" questions regarding reliability and ultimate power.

I bet when your engine knocks you ask it, "who's there!"


[This message has been edited by ottos (edited April 07, 2001).]
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Old 04-07-2001, 03:25 PM   #6
kaos200
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Okay to actually answer your questions...
An ej25 can handle about 10psi of boost max and NOT sustained, don't worry 10 psi tuned can get you up to 280hp if done correctly, you will need to compensate for fuel, either a rising rate fuel pressure regulator and a timing controller, or even better a full Engine Management System (trust me it's better this way!)
It will be reliable as long as you drive it right and don't clutch drop/powershift on the stock tranny. I however have upgraded just to have a peace of mind driving it hard...
6-7 PSI at the moment is FUN, even daily driven...
8-10psi I can pull most any car in town...(no one flame me I'm not kidding!)
Porsche Boxter S, SS camaro (some trouble at 5psi!) etc...
gotta go but if you have any questions email me okay?..
Oh yeah and this can all be done for not a ton of cash if you do it right the first time, don't take me wrong, it takes $$$ but it's obviously nice to have it all done right the first time, so do your research...
just when you thought you were out of school?
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Old 04-09-2001, 04:43 PM   #7
shiv
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Location: SF Bay Area, CA
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A 10psi 2.5RS, given proper engine management and turbo sizing, should be good for at least 310hp on pump gas. 8psi should yield somewhere around 280hp. 6psi, around 260 horsepower. All these numbers are based on actual dyno testing, of course

Cheers,
Shiv
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Old 04-09-2001, 08:09 PM   #8
hayscoob
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Location: santa rosa, ca, usa
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2004 STi Aspen White
Bone Stock for now

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shiv

I met one of your customers the other day. Wow! I was imprezed. His name was Zach. He mentioned he burned a little oil. Could this be a blow by problem with weak piston rings. He mentioned he was running around 8 psi. Other than that he has had good reliability with the turbo kit you installed for him. Not to mention his story about holding his ground with a new Corvette. He was guessing but the corvette speed limiter halted his action at 155 mph. Of course the suby speedo was buried past the 120 mark and he said he was neck and neck. Poor Corvette owner. That's gotta hurt the ego a bit eh?

One question I was wanting to ask. With new forged pistons and stronger rods and tranny, is it possible to run higher boost pressures to say maybe 12-14 psi and approach the 350-400 hp range?
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Old 04-09-2001, 11:58 PM   #9
shiv
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Actually, I have yet to meet Zach. But I have seen his car since it used to belong to Sean M. who I met up with last year when I installed a TEC-II on his already turbo'd MY00. As for oil burning, I suspect it's more likely to be problem with the oil drain line which misrouted in the stock Minnam turbo kit.

As for built motors, they would certainly allow for greater power levels. Prepared properly, there really shouldn't be any reason why a built EJ25 couldn't run 15psi of boost and make close to 400 horsepower in street trim. Maybe close to 500hp at 20psi with race gas. It's just a matter of tuning at that point.

Cheers,
shiv

[This message has been edited by shiv (edited April 10, 2001).]
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Old 04-10-2001, 12:19 AM   #10
stimpy
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Location: Austin, TX
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2008 STI

Angry

Thanks to those who ridiculed me (and no, I wasn't flaming him), but I have not had any problems pulling up old posts AND it is a lot more detailed that just a couple sentences. The information he is requesting has been done to death. Think before you speak.

Every turbo kit is slightly different, while every one of them will give you similiar results. Some have small turbos, some have large ones. It is all a matter of personal preference and who you wish to give your money to.

To sum up very bluntly:
*reliability is only as good as your engine management
*tranny is the weak link
*220hp-250hp depending upon kit and engine managment

HAPPY?

-Jon
all-knowing EJ25 turbo God
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Old 04-10-2001, 10:36 PM   #11
hayscoob
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2004 STi Aspen White
Bone Stock for now

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Thanks shiv, when it comes time to go that way, you will be the man. Me thinks 275-325 will be enough. My main concern was reliability over time. My thoughts were to build up the bottom end of the motor for more boost but more importantly, longevity.
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