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Old 04-22-2010, 11:25 AM   #1
ArronStump
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Default transmissions?

I dont feel like asking the rest of nasioc and get burned and put down for breathing wrong so I ask you south west...

Im going to by a sti swap, just the motor, ecu, wireing harness and cross member.
My question is does my lil 2.5i have the same trans as the 06/07 wrx's???

I need to buy a heavier duty clutch and if I do have the same ill just get one for the wrx.

I know I know i have to be easy on the transmission, no lauching, no hard sprints from 1st to 2nd. and rev match....Ive done my search, I just need this one question answered.
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Old 04-22-2010, 12:14 PM   #2
kpluiten
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As far as I know, the 2.5i trans is not the same as the WRX trans. I know the ratios are different at the least. I'd suspect that it is likely weaker, but I don't know for sure.

EDIT: Subaru Genuine parts lists them as the same price, but without the part numbers to compare, that really means nothing.

I say build it and see what happens. If it blows up, you consider transmission options at that point. You can get a true WRX 5MT for 600-1000 or a 6MT for 3000.

Last edited by kpluiten; 04-22-2010 at 12:21 PM.
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Old 04-22-2010, 03:36 PM   #3
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Old 04-22-2010, 04:51 PM   #4
AWDshenanigans
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Old 04-22-2010, 06:34 PM   #5
ArronStump
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thats as far as i got on the price thing...I called dale @ boxer4racing.com and he says he ran 19 psi out his sti swapped GD rs with a stock transmission and a stage 1 organic clutch and it help without slipping so i night go that route
Quote:
Originally Posted by kpluiten View Post
As far as I know, the 2.5i trans is not the same as the WRX trans. I know the ratios are different at the least. I'd suspect that it is likely weaker, but I don't know for sure.

EDIT: Subaru Genuine parts lists them as the same price, but without the part numbers to compare, that really means nothing.

I say build it and see what happens. If it blows up, you consider transmission options at that point. You can get a true WRX 5MT for 600-1000 or a 6MT for 3000.
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Old 04-22-2010, 07:03 PM   #6
KP
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You have to keep in mind that the rs weighs 400lbs less then your car. That makes for a lot less stress on the gears
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Old 04-22-2010, 07:16 PM   #7
ArronStump
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very true...
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Old 04-22-2010, 08:19 PM   #8
bobturismo
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Quote:
Originally Posted by KP View Post
You have to keep in mind that the rs weighs 400lbs less then your car. That makes for a lot less stress on the gears
Exactly, that's the problem, the trans was designed for a car that is 400-500 lbs lighter.

You take any RS/GC bodystyle with a WRX/RS trans and (stock wrx clutch) and less than 300hp and you can beat on it all day. Alot of the major force that would break the trans, is turned into clutch slip (or tire slip).

Imagine the same car with 500 extra pounds of dead weight, plus your body weigh, plus any passengers. A GD WRX with four people weighing between 150-200lbs each is an additional 1000-1200lbs over the weight of an empty RS/GC , for the most part, the same transmission that's in both cars.

"Shock" is actually what breaks a transmission, theoretically you could put 1000hp through a stock trans in a perfect world and the power was delivered smoothly. Shift hard into 2nd gear under almost WOT and you'll blender the gears into dust.

You could use a stock 2.5i trans for quite while with an STI motor. Don't ever launch hard or shift hard or drive around with a lot of weight in the car and your trans will last forever, kinda defeats the purpose of doing the STI swap. What ends up happening is that somoene does a turbo swap into an NA car or an STI motor into a WRX, they drive around for a while, blow up the trans and then have it rebuilt. At that point they've spent enough money and lost money on be able to sell the stock trans to cover the cost of just buying an STI trans in the first place.

Sell stock trans $1000-1200 + buy STI trans = blown trans removal labor + trans rebuild ( and then you run the possibility of needing a rebuild again)

It's not the gears that's the problem, it the case, there's a reason the 6spd case is completely different. I ahd RA gears in WRX box built by dynocomp and I shredded 2nd gear with 310whp and a ACT clutch, but I drive like an idiot.


My advice for guys in your situation (trust me there are plenty and most of us have been there),

1. sell/trade your car and buy a used STI

2. buy a COMPLETE STI swap or a wrecked STI (donor car)

By the time you buy a swap, do the labor and work out all the bugs (are the 2.5i fly by wire?) you might be close to the cost difference of just trading in the car on an STI. The only downside would be the cost of insurance, not sure what you pay now though, might not be that bad.

You're gonna have to do the math out, I don't know how cheap you can get a swap for or how much you know about swaps or how much you can pay someone to do it, who knows you may be able to do it cheaper than everyone else.

If you find a whole donor car or a more complete swap, you can sell your car and just buy a shell and swap everything into the shell instead tearing apart a perfectly good driving car, unless your motor is bad or something, I don't know.

I think I even saw someone selling a shell on here too. That way you could take your time and still have a car to drive.

I personally have an RS coupe shell on the side of my house and I'll wait for a swap to come along instead of paying high dollar for the first one can I find.

Last edited by bobturismo; 04-22-2010 at 08:26 PM.
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Old 04-23-2010, 12:59 AM   #9
Smoby
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AAron I think you changed the oil in my moms Legacy the other day she was saying something to me about it if I knew you.

Anyways is there a reason you want to swap your car? You have probably heard before what Bob just said but it is the truth. I went down the wrx to sti swap route and spent tons more then if I would have if I bought an sti. Only cool thing is I have a bugeye but if you have a new body style it is little pointless.

If you do not have the funds I suggest saving up or getting a loan cause really you will thank yourself just buying a STi. If you really want to do a swap a lighter shell is the way to go and a lot cheaper.
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Old 04-23-2010, 01:03 AM   #10
Sting_Ray1502
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It shouldn't be much weaker, but the ratios are definitely different. It would be much better for you to just swap in a tranny at the same time.
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Old 04-23-2010, 02:14 AM   #11
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Quote:
Originally Posted by ArronStump View Post
thats as far as i got on the price thing...I called dale @ boxer4racing.com and he says he ran 19 psi out his sti swapped GD rs with a stock transmission and a stage 1 organic clutch and it help without slipping so i night go that route
2007 2.5i Curb weight: 3037 lb
2006 wrx tr Curb weight: 3140lbs

where are you getting 400 lbs from? did you not notice that the above post said GD rs???
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Old 04-23-2010, 03:07 AM   #12
racingfish
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sti 3351
ltg wagon 3354
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Old 04-23-2010, 04:42 AM   #13
kpluiten
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Quote:
Originally Posted by racingfish View Post
sti 3351
ltg wagon 3354

WTF? What does this have to do with the OP?
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Old 04-23-2010, 05:25 AM   #14
KP
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^^

Quote:
Originally Posted by SubeSTIle View Post
2007 2.5i Curb weight: 3037 lb
2006 wrx tr Curb weight: 3140lbs

where are you getting 400 lbs from? did you not notice that the above post said GD rs???
I must have read right over the who GD part. I was thinking and speaking about the GC.
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Old 04-23-2010, 11:11 AM   #15
ArronStump
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it was a GD i think a 04 or an 05. he said he just didint drive a moron and all was well.
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Old 04-23-2010, 11:23 AM   #16
ArronStump
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DGM

Default

Quote:
Originally Posted by Smoby View Post
AAron I think you changed the oil in my moms Legacy the other day she was saying something to me about it if I knew you.

Anyways is there a reason you want to swap your car? You have probably heard before what Bob just said but it is the truth. I went down the wrx to sti swap route and spent tons more then if I would have if I bought an sti. Only cool thing is I have a bugeye but if you have a new body style it is little pointless.

If you do not have the funds I suggest saving up or getting a loan cause really you will thank yourself just buying a STi. If you really want to do a swap a lighter shell is the way to go and a lot cheaper.
I did have your mom in the shop, all she did was talk about how you waste your money on your car...lol

Quote:
Originally Posted by bobturismo View Post
Exactly, that's the problem, the trans was designed for a car that is 400-500 lbs lighter.

You take any RS/GC bodystyle with a WRX/RS trans and (stock wrx clutch) and less than 300hp and you can beat on it all day. Alot of the major force that would break the trans, is turned into clutch slip (or tire slip).

Imagine the same car with 500 extra pounds of dead weight, plus your body weigh, plus any passengers. A GD WRX with four people weighing between 150-200lbs each is an additional 1000-1200lbs over the weight of an empty RS/GC , for the most part, the same transmission that's in both cars.

"Shock" is actually what breaks a transmission, theoretically you could put 1000hp through a stock trans in a perfect world and the power was delivered smoothly. Shift hard into 2nd gear under almost WOT and you'll blender the gears into dust.

You could use a stock 2.5i trans for quite while with an STI motor. Don't ever launch hard or shift hard or drive around with a lot of weight in the car and your trans will last forever, kinda defeats the purpose of doing the STI swap. What ends up happening is that somoene does a turbo swap into an NA car or an STI motor into a WRX, they drive around for a while, blow up the trans and then have it rebuilt. At that point they've spent enough money and lost money on be able to sell the stock trans to cover the cost of just buying an STI trans in the first place.

Sell stock trans $1000-1200 + buy STI trans = blown trans removal labor + trans rebuild ( and then you run the possibility of needing a rebuild again)

It's not the gears that's the problem, it the case, there's a reason the 6spd case is completely different. I ahd RA gears in WRX box built by dynocomp and I shredded 2nd gear with 310whp and a ACT clutch, but I drive like an idiot.


My advice for guys in your situation (trust me there are plenty and most of us have been there),

1. sell/trade your car and buy a used STI

2. buy a COMPLETE STI swap or a wrecked STI (donor car)

By the time you buy a swap, do the labor and work out all the bugs (are the 2.5i fly by wire?) you might be close to the cost difference of just trading in the car on an STI. The only downside would be the cost of insurance, not sure what you pay now though, might not be that bad.

You're gonna have to do the math out, I don't know how cheap you can get a swap for or how much you know about swaps or how much you can pay someone to do it, who knows you may be able to do it cheaper than everyone else.

If you find a whole donor car or a more complete swap, you can sell your car and just buy a shell and swap everything into the shell instead tearing apart a perfectly good driving car, unless your motor is bad or something, I don't know.

I think I even saw someone selling a shell on here too. That way you could take your time and still have a car to drive.

I personally have an RS coupe shell on the side of my house and I'll wait for a swap to come along instead of paying high dollar for the first one can I find.
I agree with you, and i will buy an sti. but ill have this one too and it will be a fun broken project all the time...I can live with that
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