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Old 08-21-2010, 12:57 AM   #1
Goat
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Question STS turbo?

has anyone heard of installing a sts turbo on an n/a 2.5 motor?? does it work/is it worth it?? if so can i get a link to a website that i can get one?
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Old 08-21-2010, 01:12 AM   #2
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turbo on NA = broken engine.

You need to upgrade the internals to support boost or it just fails.
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Old 08-21-2010, 02:31 AM   #3
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Quote:
Originally Posted by Back Road Runner View Post
turbo on NA = broken engine.

You need to upgrade the internals to support boost or it just fails.
The AFI forum better not see this.......

Granted the wise thing to do is upgrade pistons and rods, because boost is like crack, the more you get, the more you want.



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Old 08-21-2010, 03:11 AM   #4
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When a slew of people tell you they destroyed their stock internal forced induction upgraded na engines, you start to listen to them. As said by many people, it's not a matter of if, it's a matter of when.
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Old 08-21-2010, 10:48 AM   #5
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Most of what we do around here could be broken down into just a few paragraphs that can offer an idea of what you can and can't (and should and shouldn't) do to any given Subaru. The questions never change, but the answers are always varied (with incorrect material sometimes delivered like gospel), the information is mucked with filler or flaming, and the Search function get diluted with garbage.

For the OP, I offer the same question as I do every other aspiring major drivetrain modifier: How's your backup car looking?

You can build an engine a million different ways. Some will be close enough. Some will be bulletproof. Some plain and simple will expire, and if that's OK, then you're headed down the right road. If you're building up a daily driver, though, and you don't have a backup machine, aren't familiar with the technology, and especially if you're on the bleeding edge of your budget as it is, you're making a mistake.
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Old 08-21-2010, 12:02 PM   #6
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Turbos on NA Subarus are not worth the money and the headache.

Also, try not to make multiple threads
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Old 08-21-2010, 01:13 PM   #7
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Quote:
Originally Posted by ballitch View Post
The AFI forum better not see this.......

Granted the wise thing to do is upgrade pistons and rods, because boost is like crack, the more you get, the more you want.



~Josh~
Its been seen and are laughing at the retards wh osay this on the N/A.
^^^^^^^like he so put it if you don't have self control don't do it. Or you could stick with a manual boost controller so you have to go into the engine every time to turn it up. But a 6-7 psi will be fine assuming the tune you use is on par. I'm about to SUperCharge my 2.5i it will be the first with a centrifugal compressor with out having to cut my hood lol on 7 psi so really it will be the first SC 2.5i becuase most are only running 3 psi of boost at 6400 which is pointless really. Agian tune tune tune must be right on or even with forged pistons you'll crack a hole in one.
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Old 08-21-2010, 10:38 PM   #8
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Man you love posting in ever turbo topic here!

Anyway, the true issue is dynamic compression. Without better pistons it will eventually break something. Tuning helps for sure, but it tuning alone can't completely make up for the ridiculously high dynamic CR caused by the stock piston face.

Pop in aftermarket forged dished pistons, and now we're talkin.
Rods are the same as the stock WRX which can take up to 20 psi boost on stock internals. While I'm not saying that the 2.5RS can do the same, I am saying that the rods will be for the most part, just fine.
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Old 08-22-2010, 06:44 PM   #9
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sorry about the multiple posts and soundin like a huge dummy. thanks all for answerin my question, and no im not putting a turbo on an n/a....even tho its slow im not tryin to blow it up.
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Old 08-23-2010, 09:06 AM   #10
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The STS remote system was fitted on a 07 Legacy 2.5i but the owner didnt go through with the build They work well but are better suited to F and N bodies (yes Cavaliers and Grand Am ) The Remote system would be far more easy to fit as you only need to mod the axleback but you would also need a decent oil pump and you need to thermo-protect the charge pipe for the length of the car.

Of all the turbo options this one would require the least engine related hardware changes.
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Old 08-23-2010, 09:32 AM   #11
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Quote:
Originally Posted by VIsubi View Post
...so really it will be the first SC 2.5i becuase most are only running 3 psi of boost at 6400 which is pointless really...
Interesting logic. Can you tell us what the breakpoint is between being "really" supercharged and "not really" supercharged? Is it 4psi? 4.7psi? 6.8?

Quote:
Originally Posted by GEE-OTTO View Post
The STS remote system was fitted on a 07 Legacy 2.5i but the owner didnt go through with the build They work well but are better suited to F and N bodies (yes Cavaliers and Grand Am )
What makes those random models better suited? I don't even see them listed on STS' website.
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Old 08-23-2010, 01:50 PM   #12
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I never really see the topic of turboing an NA Subie as a "can you?" issue. Yes you can, there are risks (aside from what some say) that can be managed if you do it right. It can also be very expensive, at which point you have to (or at least you should) ask yourself, "Is it worth it? Or should I just spend the cash on a WRX?

Turbocharging and NA car will get you a more HP. Buying a WRX will get you a more HP in a more reliable turbocharged engine and...everything else that you get with a WRX that you can't get on a 2.5i or RS. Upgrqaded suspension, bodykit, scoop, spoilers, better seats, etc. etc.

Turning a 2.5i into a WRX can be a fun project, but it's never going to be cheaper than just buying the WRX to start with.
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Old 08-24-2010, 09:25 AM   #13
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Quote:
Originally Posted by Patrick Olsen View Post


What makes those random models better suited?
YOU can run a Remote turbo on ANY car. Just historically NOT SUBARUS (i ****ing hate having to explain every point on this website).

Ask the Mustang and Chevelle and Camaros or other "Muscle Car" owners why they chose a remote system if you want in depth reasoning why.
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Old 08-24-2010, 11:03 PM   #14
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Quote:
Originally Posted by GEE-OTTO View Post
YOU can run a Remote turbo on ANY car.
Yes, I know. I asked why you said remote turbos are better suited to two random, rarely modded GM FWD economy cars.

Quote:
Originally Posted by GEE-OTTO View Post
Just historically NOT SUBARUS
For obvious reasons. All the parts to install a "normal" turbo setup on a Subaru are readily available from a junkyard or from this forum or a number of other Subaru forums. Why go through the effort of re-engineering the car when FHI's engineers have already done all the work for you?

Quote:
Originally Posted by GEE-OTTO View Post
(i ****ing hate having to explain every point on this website).
Then don't make non-sensical comments.

Pat
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Old 08-25-2010, 08:07 AM   #15
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Quote:
Originally Posted by GEE-OTTO View Post
They work well but are better suited to F and N bodies (yes Cavaliers and Grand Am
F-body's a Camaro or Firebird. The Cavalier and its ilk are J-bodies.

And I have no idea why you'd want a remote mount on a 4 cylinder engine. It just seems ridiculously impractical, unless you're all about high end power.
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Old 08-25-2010, 11:38 AM   #16
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Quote:
Originally Posted by LetItSnow View Post
F-body's a Camaro or Firebird. The Cavalier and its ilk are J-bodies.

And I have no idea why you'd want a remote mount on a 4 cylinder engine. It just seems ridiculously impractical, unless you're all about high end power.


N bodies are FWD GM COMPACT CARS
J bodies are GM FWD PASSENGER CARS

Both span the same production range early-mid 80's and terminate in 2005 when the Zeta and Premium bodies started.

I am a long time member of the GM N and J body club in my area I think I know what I am talking about.

I never ran a remote turbo on my N body I have seen one on a N Body Cavalier and one on a 2007 LEgacy 2.5i. Those two bits of info are all that needed to come out of my posting to help the OP in his quest for Remote STS turbo knowledge.
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Old 08-25-2010, 11:39 AM   #17
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Quote:
Originally Posted by Patrick Olsen View Post
Yes, I know. I asked why you said remote turbos are better suited to two random, rarely modded GM FWD economy cars.
Are you serious? Rarely modded HAHAHAHAHAHAHA
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Old 08-25-2010, 11:47 AM   #18
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Quote:
Originally Posted by Patrick Olsen View Post


For obvious reasons. All the parts to install a "normal" turbo setup on a Subaru are readily available from a junkyard or from this forum or a number of other Subaru forums. Why go through the effort of re-engineering the car when FHI's engineers have already done all the work for you?
I may be wrong, but the OP seems to be inquiring about boost setups that require the least modifications. Hence my comment about the STS needing the LEAST hardware mods. Now you of all people should know the FHI thoroughly shafted all N/A owners by not using a common lower engine cross member, giving us a 200ft/lb pp and 196hp clutch disc, and no hood scoop to provide room for a TMIC.

To acquire these parts would be costly and time consuming.
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Old 08-25-2010, 02:09 PM   #19
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Quote:
Originally Posted by GEE-OTTO View Post
I am a long time member of the GM N and J body club in my area I think I know what I am talking about.
Never heard of an N-body Cavalier. Can you show me a link?

Last edited by LetItSnow; 08-25-2010 at 02:17 PM.
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Old 08-25-2010, 02:44 PM   #20
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Old 08-25-2010, 02:46 PM   #21
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I stand corrected....

N-body: http://en.wikipedia.org/wiki/GM_N_platform
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Old 08-25-2010, 07:19 PM   #22
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Quote:
Originally Posted by GEE-OTTO View Post
I am a long time member of the GM N and J body club in my area I think I know what I am talking about.
Which is why LetItSnow questioned your initial reference to F bodies.

Quote:
Originally Posted by GEE-OTTO View Post
Are you serious? Rarely modded HAHAHAHAHAHAHA
Yes, I'm serious. Considering how many of them were produced and sold as plane Jane, grocery getter, automatic, base model cars for John and Jane Doe or a rental car company, the percentage of those cars that have been significantly modded is tiny. I can't say I've ever come across one that's modified/tuned. (And I'm not counting Altezza taillights or a Supra-esque wing as "modified".)

Pat
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Old 08-25-2010, 08:03 PM   #23
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Quote:
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404: Cavalier not found. Do tell?
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Old 08-25-2010, 10:27 PM   #24
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The General Motors N platform (commonly called the N-body or N car) was a front-wheel drive compact automotive platform produced from 1985 to 2005. The GM N platform replaced the GM X platform.


What part about compact and GM DONT YOU GET? Cavalier compact, 2 dr Grand Am compact, Olds Alero sames as a GA.

If you want to yap about GM cars when they were initially used as a reference to the topic of this thread I suggest you find a GM N body website, otherwise **** about GM body lines and which cars fall into that subset or not.
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Old 08-25-2010, 11:28 PM   #25
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All right, GEE. I'll take that as an admission that you're wrong or evidence that you're short of a clue and call it a day. Much thanks!

I still can't imagine why a rear-mounted turbo would fit well with a J-body Cavalier or an N-body Grand Am? At least an F-body Camaro or Firebird has some torque to get it in motion.

There's got to be some hellacious lag involved with those rigs...
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