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Old 12-05-2003, 05:53 PM   #1
Coow
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Default mod for 2.5RS engine???

hi guys

Anyone out there had mod. their 2.5RS engine?? I heard the engine itself is really weak. not strong enough for the turbo. hv anyone of u shoot a turbo to RS?? notice any problem?? thx a lot
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Old 12-05-2003, 05:55 PM   #2
subarucyclist
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It's my understanding that it's a good engine overall, especially the phase 2 SOHC motors. Smooth, decent torque and a good overall feel, and quite reliable.

It's just not specifically designed for the stress caused by a turbo.
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Old 12-05-2003, 06:38 PM   #3
Hawk296
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its not designed for a turbo, thats why they dont hold up to teh pressures and temps of a turbo motor. the compression ratio is too high and the internals are too weak (pistons liek to melt) to safely turbocahrge it. You could lower compression, use beefy internals, strenghten the block (semi closed deck style).

for the price it would cost to do it right and have it not break you could do a WRX engine swap (made for boost) which would be arguably more reliable and driveable.

In stock form it is a durable, reliable engine, just as it was designed to be. You can do the stadard bolts ons and even go as far as cams and such and make it really fun to drive.

I reccomend just doing the bolt ons and suspension stuff and that sort, then learn how to drive, you will realize you have a pretty good car at that point. If your trying to make a drag car, buy a differnt car. THrowing tons of power at it (RS-T style) is probably one of the last things you do, after the viper ACRs and stuff are beating you in the straight aways.
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Old 12-05-2003, 06:51 PM   #4
DrBoy01
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Plenty of guys on the N/A forum have modified the internals of their EJ25. If you did a search for posts by Dcoty or about his setup, you would see that he's had considerable success with his N/A build.

In terms of turboing the EJ25, you should go to the Aftermarket Forced Induction (AFI, like the band ) forum to get some more information about low compression pistons, stronger internals, etc. that could help you produce more boost safely.

It should be noted, however, that there are a whole bunch of NASIOC members who have successfully and (mostly) reliably put their stock-internal EJ25s under low amounts of boost (>6 psi) with impressive results. This usually comes with a lot of engine management, but check the AFI forum for more detailed information.

Also notable is that while you could do a WRX engine swap for the price of a well-designed turbo kit, a turbo'd 2.5 RS is much faster than a comparably modded WRX. Imagine loads of torque down low with almost no boost lag...heaven! Something in my gut tells me the install for the turbo kit would be cheaper, as well.
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Old 12-05-2003, 07:46 PM   #5
Snagtastic
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Plz use the search button.
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Old 12-06-2003, 02:11 AM   #6
Coow
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Default

[quote]Originally posted by Snagtastic
Plz use the search button. [/QUOT
E]

wow.............thx a TON for your great respone, your information is really help man. you know.........there so many ppl respone the same way like you which's pissed me off. if u not doing any good to the topic then why would u waste your time to respone. I just dont get.................
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Old 12-06-2003, 02:12 AM   #7
Coow
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by the way........thx a lot for the rest of u guys up there. I appreciated that
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Old 12-06-2003, 02:35 AM   #8
PRIOR
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rice?
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Old 12-06-2003, 06:16 AM   #9
Patrick Olsen
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Default Re: mod for 2.5RS engine???

Quote:
Originally posted by Coow
Anyone out there had mod. their 2.5RS engine??
No, nobody has. The entire forum is devoted to people thinking about what it would be like if they "had mod. their 2.5RS engine".

Quote:
Originally posted by Coow
hv anyone of u shoot a turbo to RS??
Uhhhh.... was that English? If you try typing your questions in the native language spoken here you'll probably get more productive replies. If you type gibberish, people will be inclined to say, "use the search function."

Pat Olsen
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Old 12-06-2003, 01:58 PM   #10
DrBoy01
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Quote:
Originally posted by PRIOR
rice?
Funny , and I know where that came from, but that doesn't help the topic at hand. The guy asked an honest question so he deserves an honest answer. He's trying to be productive. Let's try and keep the flaming to OT, guys.
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Old 12-06-2003, 02:19 PM   #11
PRIOR
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i thought it was subtle enough not to be too bad, but yeah... your right
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Old 12-06-2003, 11:59 PM   #12
Coow
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okok...alright, i'm sorry for my english, gibberish.....whatever!!!
English is my second language ok, Thank you!! try to learn another laugage see if u can speak or write fluent within 2 years
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Old 12-07-2003, 12:02 AM   #13
Coow
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but that's ok.....you excused. American stupid anyway, can't even do basic algebra. No....I mean you guys can't even do fraction add fraction. Gosh.............
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Old 12-07-2003, 12:09 AM   #14
Kevin Thomas
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Default Huh

Quote:
Originally posted by Coow
but that's ok.....you excused. American stupid anyway, can't even do basic algebra. No....I mean you guys can't even do fraction add fraction. Gosh.............
??? Stupid Americans? Where this come from? This topic is getting out of hand mods.
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Old 12-07-2003, 12:09 AM   #15
Mirage
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Default

[quote]Originally posted by Coow
Quote:
Originally posted by Snagtastic
Plz use the search button. [/QUOT
E]

wow.............thx a TON for your great respone, your information is really help man. you know.........there so many ppl respone the same way like you which's pissed me off. if u not doing any good to the topic then why would u waste your time to respone. I just dont get.................
Don't forget, you were the guy that came in and called our Subaru's rice for putting on rally stuff and said stuff like that belongs on a Civic.. last week in the Member's Gallery. YOU deserved that.
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Old 12-07-2003, 12:15 AM   #16
Coow
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Rice?? did I say rice?? I own a 2.5RS too. I just can't stand that 2 extra fog light, come on....2 are enough, does it look good if your woman got 4 breasts?? can't even do little design, no wonder u guys DESERVED a brain can't do fraction.
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Old 12-07-2003, 12:24 AM   #17
Mirage
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Um.. yeah.. do the word "Offiicial Rice Thread" ring a bell?

If looking at a car gives you wood, u have issues dude. Fogs serve a function when you rally.
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Old 12-07-2003, 12:35 AM   #18
Coow
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rally?? oh come on......2 fog lights give him enough to do the rally?? I can't even say it out loud for my Evo8 to do the rally thing. RS??? come on......... the definition of rice for me is if you guys not own a STI or WRC, then stop putting in STI part or pretend as a rally car. this is so rice.
anyway........I'm here not for arguing with you Mirage, if you have that much time, go practice your fraction cos finals is coming dude
here some......
4/7+ 9/12
12 + 5/13
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Old 12-07-2003, 12:48 AM   #19
Mirage
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Good God.. U think like the new STi owners that have no clue and respect for what the RS or the WRX is.

Just so u know, Canadian Patrick Richard is now in the WRC, and he started it all from his 98 RS, doing amateur rallying, that was only 5 years ago.

Finals? Get outta here kid.. I'm done here.
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Old 12-07-2003, 12:57 AM   #20
Coow
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awww............you done?? but can't even do a fraction. aww.........I'm sorry, maybe my questions are too damn hard for you. try this then....3+5
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Old 12-07-2003, 01:00 AM   #21
Coow
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gosh......why am I wasting time here to arguing with moron like you. "Suby".........."Rally"..............."STI"....... get a life man
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Old 12-07-2003, 01:02 AM   #22
imp2.5
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Ok, so he asked a very obvious question. When I first got my RS back in '01 I thought the same thing. Coow, my suggestion is not go get mad at people and just spend some time looking at what's on the forum. There is so much information that is brand new and there is also so much that people have previously talked about. I honestly love the search button, it saves so much time and can get you what you want. For the "rice" thing. I wouldn't agree with you at all and I hope you don't take an offense to it. But for rallying those extra lights do help when you have night stages because some of them point to the side so you can see where you're going when you are sideways at 75 mph. I rally-x my RS all the time and these cars do have tons of potential. I frequently beat wrx's just because our cars are not turbocharged (low end torque rocks! ). So please just understand that we are not all american punks that don't know how to do math (believe me, I passed calc II, not fun ). So I hope everything will be alright and you guys can both have a good night and not worry about it.
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Old 12-07-2003, 01:08 AM   #23
Coow
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thx a lot, this is what I called human language
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Old 12-07-2003, 02:01 AM   #24
Reckon
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USE THE SEARCH FUNCTION

Default

Man. I think these guys are just trying to say that you can learn a lot from doing a search on this forum, instead of posting another thread asking the same question 2 or 3 or more other threads have already answered and answered by knowledgable individuals who invest a few valuable minutes doing so and would like to avoid doing so again. Plus by using the search engine you get the information you're looking for right away, giving a few minutes to sift through some of the material - instead of having to wait.

Also, there are some guys out there who do beginner-amateur rallying and needing a couple extra lights; maybe everyone has a different understanding of rice, but from how I see it, if it's functional and not flagrant it's perfectly fine.

And to answer your question, from my research it seems that our blocks and pistons are prepared for our current compression ratio and so it would not be too good an idea to simply bolt on a turbo. Now, if you want to do some engine modding then obviously you'll have to decide what route you wanna go. I'm sure you know already that taking your subaru the N/A route is going to involve cams, flywheel, heads, pulley, headers, intake, and other what nots. If you want to go aftermarket turbo, then change up the block and pistons, cams, etc.

One more thing. This isn't OT and so try to be professional and refrain from insults and what not. When you do this people are less inclined to help you out and more inclined to continue with a flame war. You'll find that you have less crappy messages like this one here cluttering your thread.

Oh, and by the way, the answers to your fraction questions are
161/13, 111/84, and 8
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Old 12-07-2003, 02:06 AM   #25
Patrick Olsen
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OK, here's the scoop. Yes, you can do a number of mods to a 2.5L engine, but if you want to make significantly more power than stock you're going to have to spend some $$$. (Or whatever the money symbol is in your language ).

Yes, people have turbo'd 2.5s, and there's a whole forum (aftermarket forced induction) devoted to those turbo kids. I've heard mixed reports about what the engines can handle. Apparently some variants of the motor have pretty weak pistons, and the early 2.5s had weak head gaskets (I blew mine twice on a naturally-aspirated car).

I personally chose to stay N/A and there are only a few guys on the board here who've gone beyond what I've done. My thought with staying N/A was that I would avoid the heartache involved with tuning a turbo motor - a few of my friends have turbo'd 2.5s and it seems like the tweeking never ends. In the end, I've ended up with a car that is significantly stronger than stock (dyno'd about 40hp over stock at the wheels), but significantly less powerful than a turbo'd 2.5, and I think my ECU is pretty confused because low RPM performance is often herky-jerky. I haven't done much to fiddle with it, but one of these days I'm gonna have to figure out a "fix".

Good luck.
Pat Olsen
'97 Legacy 2.5GT sedan
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