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Old 08-22-2008, 08:53 AM   #1
darkwolf2oo3
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Default 2002 2.5 RS Turbokit

Ok, I was looking over my current financial situation, sometime within the next 6 months I should be able to afford a decent 2002 2.5 RS sedan. My questions are, first, can this engine handle boost, and if so how much, note though I wouldn't run that much anyways, it would just be a daily driver to get to and from college 4 days a week. Second, what is the best turbo kit, if you could provide a link that would be great. I have decided against the mid-late '90s Legacy/Impreza/Forester only because they are harder to find in my area then the GDB chassis Imprezas, which you can find at just about any used car dealership. Whereas the mid-late '90s Subarus, I would have to travel at about 100 or so miles to find one which is in decent shape.
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Old 08-22-2008, 07:28 PM   #2
beaun-nus
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5-6 is a safe number. there are 2 premade kits that i know of, AVO and FAT. You can also do it from scratch with alot of oem parts and some modification. Most people will tell you to swap though.
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Old 08-22-2008, 08:40 PM   #3
darkwolf2oo3
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I was considering the swap, but I decided on the 2.5 with a turbo kit, because I want good low end grunt, I have driven a 1998 2.5 with a WRX swap, and then driven a 2000 2.5 RS with a turbo, and just loved the low end grunt the 2.5 turbo had. I'm sure you can get good low end grunt from a 2.0 WRX engine, but the 2.5 may be a better option for me, seeing as most gas stations in my area have pretty much all switched to 91 octane crap gas. Also the 2.5 would have less lag, wouldn't it? After comparing the two, I think will saving for the AVO turbo kit.

Last edited by darkwolf2oo3; 08-22-2008 at 08:45 PM.
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Old 08-22-2008, 10:57 PM   #4
RobK0000
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i would recommend you think about what you will be doing with the car in the future, are you into racing it or just a dd, the 2002 isnt very special of a car. Its just a wrx without the turbo, If you had a GC i would say swap instantly, so much more gains and its a gc. Sick platform and it looks sweet!

Please post back up with what your intentions with the car are, will you auto X or just dd like you said. If you want to autoX either get a wrx, or stay NA. It will be fun either way.
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Old 08-23-2008, 01:12 AM   #5
ronoverdrive
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Do a STI or 06+ WRX swap. 2.5l with turbo, plenty of all around power.
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Old 08-23-2008, 09:55 AM   #6
darkwolf2oo3
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Quote:
Originally Posted by RobK0000 View Post
i would recommend you think about what you will be doing with the car in the future, are you into racing it or just a dd, the 2002 isnt very special of a car. Its just a wrx without the turbo, If you had a GC i would say swap instantly, so much more gains and its a gc. Sick platform and it looks sweet!

Please post back up with what your intentions with the car are, will you auto X or just dd like you said. If you want to autoX either get a wrx, or stay NA. It will be fun either way.
It will be a daily driver, for the most part, because the closest place to have auto cross is 4 hours away, so I only get there once a year, if that. So it will mostly be just to go back and forth to college 22 miles away, so it will see a lot of highway driving.

Quote:
Originally Posted by ronoverdrive
Do a STI or 06+ WRX swap. 2.5l with turbo, plenty of all around power.
I had considered that, but there aren't a lot of the 06+ WRXs around my area yet, so junkyard engines are next to impossible to find unless you travel about an hour south of here, same for the STi. There are maybe 5 GD WRXs in my town, but a ****load of GD 2.5 RSs at dealerships, and on the road. Besides I'm in college, and I don't feel like I could perform the swap in one weekend, even with my friends, however we have bolted turbo kits up in a day or two, so thats another factor, time constraints. My car can't be down for more the 2 days or else I don't have a way to college. But, thanks for the suggestion, I will keep it in mind in the future, if/when I either decide I want more power from this car, or buy a different one, and want more power.
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Old 08-23-2008, 10:29 AM   #7
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Quote:
Originally Posted by darkwolf2oo3 View Post
It will be a daily driver, for the most part, because the closest place to have auto cross is 4 hours away, so I only get there once a year, if that. So it will mostly be just to go back and forth to college 22 miles away, so it will see a lot of highway driving.

I had considered that, but there aren't a lot of the 06+ WRXs around my area yet, so junkyard engines are next to impossible to find unless you travel about an hour south of here, same for the STi. There are maybe 5 GD WRXs in my town, but a ****load of GD 2.5 RSs at dealerships, and on the road. Besides I'm in college, and I don't feel like I could perform the swap in one weekend, even with my friends, however we have bolted turbo kits up in a day or two, so thats another factor, time constraints. My car can't be down for more the 2 days or else I don't have a way to college. But, thanks for the suggestion, I will keep it in mind in the future, if/when I either decide I want more power from this car, or buy a different one, and want more power.

Just a DD? I would not get the turbo kit, what you are asking for is more of a want than a real nessicity. You are better of getting a wrx, rather than dealing with an aftermarket turbo kit for your NA motor. Im sure you will have fun with it, but have you considered how many miles are on the car? if you are over 100k or close to i would stray away from any big power mods.

The turbo kit you are buying, does it need tuning, you will NEED a tune, otherwise you car will run like ****. period. It would be a waste of even turboing the car unless, you going to install it just for looks and a Bov.

Id recommend you save up an extra $5000 or more and just get a used wrx. You dont have to deal with the unreliability and stress of your car breaking down.


GET A WRX.
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Old 08-23-2008, 05:55 PM   #8
darkwolf2oo3
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Whats the average costs for swapping a V5 STi engine into a GC Impreza, just in case I find one of those. Would it be cheaper than the WRX. I mean you can usually find the engines online for about $3000-$4000 depending on which site. Also, I have heard, and read that the gears in the WRX are taller than they should be. As I said I have driven a GC with both options and loved the low end grunt. Also most of the 2.5 RSs I have looked at have 55,000-65,000 miles on them. They are usually in really good shape to. The tourists that come through my town, and the surrounding towns and cities usually trade them in up here, because the cars are usually cheaper here, than where they(tourists) live, hence why there is usually an abundance of 2.5, and not WRXs. They trade the 2.5 RS in up here, and then buy a WRX up here which as I said above is generally cheaper then where they live, just because this area is smaller, and whatnot.
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Old 08-23-2008, 06:14 PM   #9
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I have a GC that i will be swapping in about 1 month. 2.0 wrx longblock, vf39 turbo, Invidia catted DP, 1 piece header up-pipe, perrin pipes, perrin pulleys, 3" borla catback and alot more goodies. It will be good for about 280 hp. But im also going on the stock tranny, which i expect to last about 3 months. Tops! haha.

I purchased the longblock for $1k, then all the nuts and bolt ons seperately, I spent $3k so far, i also bought both the wrx and another impreza harness so i can make the merge myself. So i will be saving more than $1k on that portion. Tuning will be the only thing left and i expect that to run around $500. The whole thing will cost me $3500-$4000.
THe car is entirely setup for autoX, i mean adjustable suspension, tires, light weight parts, harness roll bar and Sti interior. Which cost me alot. But i have been doing this for 3 years now.

The car will be INSANE, i expect it to be a monster on the track and on the road, the reasons i swapped rather than buying a new car;

1, GC platform kicks ass!
2, $10k cheaper than buying a new car, which wouldnt even be comparable.
3, just look, would you trade this in for a newer bodystyle impreza?





Basically, if you want a project car, buy the car cheap and then build it. One important thing to do is have fun with it! Im going to be driving an 04 elantra as a dd. So this gives me alot of flexibility on working on the vehicle, especially since i work fulltiem and go to school on the side. Just think about what your intentions are with the car and just head down that road, dont make a stupid choice and get the turbo 'kit', you will regret it.
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Old 08-23-2008, 10:03 PM   #10
darkwolf2oo3
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Not bad, btw I know the Japanese, and the U.S. GC wiring harnesses are different, but I have also read the if you swap a GC Japanese STi engine into a GC Impreza, you only need the engine harness, now I was wondering if you would know where I could find the necessary wiring diagram to complete the swap. There is an auto shop on campus, and I was in auto shop for a semester, however, there are a lot of people in shop class I know, that have dealt with wiring, so I'm sure I could find someone to help me with that, I just need the diagram of the Japanese engine harness, preferably English, if not, I'm sure I could find someone who has a program to translate it into English. Plus like I said I have access to lifts and engine hoists, and anything else I could possibly need. Just one more question, which is the easiest way to remove the engine, and transmission, like I said I have access to lift, so would it be best to drop it out the bottom, or lift it out the top. I figured drop it out the bottom, but I just want to make sure that something won't ruin that plan, or if it has to be lifted out, for some strange reason. Also, when I do the swap, should I switch to a front mount intercooler, I figured it would be easier to switch as long as I'm going to be putting the engine in. One more thing I must ask, seeing as mine will most likely be a 1997, I don't think '97s came with rear disk, but I think they had ABS, so what would be the best way to switch to 4 wheel disk, would the rear disk off a Legacy work. I mean I know Subarus have quite a few interchangeable parts, so I was wondering if brakes are as well, and if I would still have ABS afterwards, I need it sometimes, I'm a late braker.

Last edited by darkwolf2oo3; 08-23-2008 at 10:13 PM. Reason: Forgot something
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Old 08-23-2008, 10:10 PM   #11
novacivic
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Quote:
Originally Posted by darkwolf2oo3 View Post
Not bad, btw I know the Japanese, and the U.S. GC wiring harnesses are different, but I have also read the if you swap a GC Japanese STi engine into a GC Impreza, you only need the engine harness, now I was wondering if you would know where I could find the necessary wiring diagram to complete the swap. There is an auto shop on campus, and I was in auto shop for a semester, however, there are a lot of people in shop class I know, that have dealt with wiring, so I'm sure I could find someone to help me with that, I just need the diagram of the Japanese engine harness, preferably English, if not, I'm sure I could find someone who has a program to translate it into English. Plus like I said I have access to lifts and engine hoists, and anything else I could possibly need. Just one more question, which is the easiest way to remove the engine, and transmission, like I said I have access to lift, so would it be best to drop it out the bottom, or lift it out the top. I figured drop it out the bottom, but I just want to make sure that something won't ruin that plan, or if it has to be lifted out, for some strange reason. Also, when I do the swap, should I switch to a front mount intercooler, I figured it would be easier to switch as long as I'm going to be putting the engine in.
for pulling the motor/tranny, the motor comes out the top and tranny out the bottom
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Old 08-24-2008, 12:05 AM   #12
cquirki
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if u have big plans.... get a built motor... and a 6 speed at the same time. call ron at "RAW" performance.. man i cant get used to calling it that.. HE WILL ALWAYS BE AXIS HAHA
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Old 08-24-2008, 09:23 AM   #13
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I wouldnt say there is a wiring diagram that shows you what needs to be changed. I do know, that there is an online site Alldata that you can subscribe to and you can download all the pages for the wiring. This just tells you what each wire is for. This is what im doing right now, takes a long time to say the least.
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Old 08-24-2008, 10:45 AM   #14
darkwolf2oo3
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Quote:
Originally Posted by RobK0000 View Post
I wouldnt say there is a wiring diagram that shows you what needs to be changed. I do know, that there is an online site Alldata that you can subscribe to and you can download all the pages for the wiring. This just tells you what each wire is for. This is what im doing right now, takes a long time to say the least.
Did your car come with 4 wheel disc brakes, or are the rear swapped from some other subaru. I figured the best car to get brakes from is a same generation Forester, seeing as its an Impreza underneath. Or would it be better to swap from a 1998-2001 2.5 RS, given I can find one that wrecked. I mean most the GC Imprezas in my area are lower models that had drums out back.
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Old 08-24-2008, 06:36 PM   #15
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Quote:
Originally Posted by darkwolf2oo3 View Post
Not bad, btw I know the Japanese, and the U.S. GC wiring harnesses are different, but I have also read the if you swap a GC Japanese STi engine into a GC Impreza, you only need the engine harness, now I was wondering if you would know where I could find the
That's a lie, you need the entire bulkhead harness as well as the engine harness for the JDM STI engine.

Quote:
Originally Posted by novacivic View Post
for pulling the motor/tranny, the motor comes out the top and tranny out the bottom
I dropped the motor/tranny with all associated crossmembers as well as the headers/uppipe/turbo all at once through the bottom of the car onto a dolley. It wasn't many bolts to drop everything together and I did that in a couple hours by myself.
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Old 08-24-2008, 08:04 PM   #16
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Quote:
Originally Posted by darkwolf2oo3 View Post
Did your car come with 4 wheel disc brakes, or are the rear swapped from some other subaru. I figured the best car to get brakes from is a same generation Forester, seeing as its an Impreza underneath. Or would it be better to swap from a 1998-2001 2.5 RS, given I can find one that wrecked. I mean most the GC Imprezas in my area are lower models that had drums out back.

I swapped them, stock it came with rotors in the front and drums in the rear, I installed rear knuckles and disks off an L for about $200. Then i converted to Sti brembos. The fronts bolt right on, and the rears required a bracket. which was fairly cheap.
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Old 08-24-2008, 08:30 PM   #17
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I swapped them, stock it came with rotors in the front and drums in the rear, I installed rear knuckles and disks off an L for about $200. Then i converted to Sti brembos. The fronts bolt right on, and the rears required a bracket. which was fairly cheap.
Would a Forester work. I mean as said before its basically an Impreza, then if I do that, when I want to upgrade the brakes I would order for the Forester then correct. I mean I have seen quite a few 1998-2000 Foresters at the local junkyard. Also if the answer is yes, should I grab the front brake setup as well.
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Old 09-21-2008, 09:31 PM   #18
LT5PLA
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would the fat kit bolt up to any 2.5 ?? i have a legacy?
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Old 09-21-2008, 10:55 PM   #19
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Quote:
Originally Posted by LT5PLA View Post
would the fat kit bolt up to any 2.5 ?? i have a legacy?
Its possible. Other stuff might get in the way.
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Old 09-28-2008, 05:48 PM   #20
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if you should decide to piece your own kit, or want to improve some of the internals, i have some ver. 6 STI RA cams for sale that are a direct swap into any DOHC non-variable timing EJ engine.

turbo cams in a turbocharged engine = more power, better powerband.
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Old 09-30-2008, 10:27 AM   #21
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To the OP,

I was in the exact situation as you were back in college except I had a 2001 RS. The low end power is great at 5-7 psi. I went ahead and got the turbo kit and I had a blast with the car and still miss it today. However, being down that road...I would recommend against it. My Tranny eventually broke and if you are going to need your car everday then you will never know when that Tranny will go. Mine broke during a light acceleration in 3rd gear. The Tranny lasted until it hit 78K.

I would keep it N/A until you get through college or just get a wrx. I have seen 2002 WRX's for under 7k. Also, Make sure you have a decent back up cash after you have your Turbo kit installed. I ended up spending a lot more cash in misc parts to increase reliabilty(Standalone ecu, injectors, J&S knock sensor, hoses, many little misc. part, etc,).

Good luck in your project if you decide to move forward with it.
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