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Old 09-23-2003, 12:25 AM   #1
dcoty
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Default Sti ver 2 tranny and options to replace center diff (01RS)

Hey guys,

I was at the dyno today (dynapack) and we figured that my cars center diff is messed up quite badly. We couldnt get the front wheels to spin at the same rpm as the rears, then the rears lock and horrible noises are heard when we gave gas to make a pull...the car would stall in 4th gear at WOT unless we started the pull when the fronts and rears eventually spun at the same rpm. We know its the center diff, i had the guys form lachute subaru there tuning the car and they are positive. Anyway:

Should I replace my diff with another 01 RS diff? Or do you guys see this as a time for an upgrade? If it is time for an upgrade, what would you guys suggest? Sti center diff?

Also, im looking into a stronger tranny for a good price, and I found a ver 2 STi tranny for 1,500$ canadian. The reason i like this tranny in particualr (besides good price) it still has a .411 final drive like my stock tranny, but (correct me if I am wrong) gears 1-4 are closer cut that on a stock RS tranny, giving better acceleration.

I chose to not go with RA gears in my car becuase I have heard that the car revs higher on the highway due to the gearing, and eventhough I track my car every tuesday, I still need it as my daily driver. Are the RA gears so bad on the highway? Can someone with experience help me out on this one?

What does everyone think of a ver 2 STi tranny in an RS? Anyone have one and would like to tell me how they like it?

Sorry for all the questions guys, but I figure I want to fix my diff in the best way possible, and while Im digging into the drivetrain, i might as well pick out a good tranny for my needs as well.

Thanks for any replies everyone, they are really appreciated.

Dan
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Old 09-23-2003, 12:06 PM   #2
Homemade WRX
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the only problem I would see you having in using that tranny is it still is used with a mechanical speedo and you are electric. The speedo calble comes off of the tranny where you have an electrical unit. So try to find a newer tranny that uses an electronic unit.
Take it easy, Micah
I have a 94 (EJ20 swap) if you decide to pass on the tranny could you hook me up with some info. I've been looking for a replacement tranny.
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Old 09-23-2003, 02:49 PM   #3
Ver.III
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If it is a real V2 Sti RA , it is a 3.90 final drive. Plus, it would have the EMCD center diff. And it is not practical for everyday driving because of the close ratios. 5th gear is almost 1:1 so to do 100kmph , you would rev about 3700 rpm.

As for the mechanical speedo cable, you can remove the mechanical part off the gearbox and put in the electronic sensor. They both are mechanically triggered.
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Old 09-23-2003, 08:40 PM   #4
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OK cool well that could work too.
take it easy, micah
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Old 09-24-2003, 04:31 PM   #5
dcoty
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Well, it doesnt seem to hear to get around the speedo problem. If an RA gear set is that short on the highway, then its not for me. I guess the STi ver2 tranny might be the best way to go. The price Iwas given is 1,500 CAD...is that a good price form what you guys know?

Also, what would be the best replacement diff then? Maybe just stick with stock or is it worth the extra $ to go with STi? It would probably help in the winter as well.

Thanks for the replies guys...keep em commin!

HomemadeWRX- Ill let you know about the tranny if I go with something else.

Thanks again guys,
Dan
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Old 09-24-2003, 07:21 PM   #6
White 2.5rs
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i was quoted 2800 for an sti v4 tranny so...thats pretty damned good lol

if anyone can find one cheaper pm me i have a need
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Old 09-25-2003, 11:20 PM   #7
Boost4U
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Hey buddy, Its Chris.....I e-mailed the guys at Z1 and they said that you can either replace your stock diff.....600USD @ www.subaruparts.com or replace your tranny.....they said there is nothing else than will work with you stock tranny..??? I guess you better go STI tranny.......Get a 6MT!!!
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Old 09-25-2003, 11:21 PM   #8
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PS. I have a 4.44 diff to go with your 6MT....but I just sold the drive shaft to Garface!
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Old 09-26-2003, 11:16 AM   #9
crash
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Quote:
Originally posted by Boost4U
PS. I have a 4.44 diff to go with your 6MT....but I just sold the drive shaft to Garface!
IIRC, the 6MT has a final drive of 3.90...
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Old 09-26-2003, 11:25 AM   #10
dcoty
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Chris! Its the first time I have ever seen you post on here!

Anyway, i think i might get an STi diff and the STi ver 2 tranny, but I need a different clutch for the tranny I was told, so I going to use a stock wrx clutch until i order a new clutch for the ver 2 tranny...can anyone confirm this? Where can I get a clutch that works with the STi ver 2 tranny? Are aftermarket WRX clutches interchangeable with this tranny?

Thanks guys!

Dan
Thanks Chris! Now go find me deals on parts!
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Old 10-03-2003, 08:39 AM   #11
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I have never come across a v2 STI tranny running 3.90 ratio. Anyone is welcome to come and count the teeth and do the math on any tranny we have here.

Also, is it a 1;1 final drive or a 1.1:1 final ???? STI 2 tranny we have had in stock (all 4 of them) have been bolted into RS diffs without issue.

Mark
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Old 10-22-2003, 02:59 AM   #12
supermoose
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youll have to convert to turbo style clutch / slave cylinder. besides for that its easy. also on ebay a STI v6 centre diff just sold for $15 +81 shipping

i have a STI v1 4.11 trans im my car with a 98 ej25, at 85 in 5th im at 4K rpm

h
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Old 10-22-2003, 02:40 PM   #13
Silver Bullet 02
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Default Re: Sti ver 2 tranny and options to replace center diff (01RS)

Quote:
Originally posted by dcoty
Hey guys,

...
I chose to not go with RA gears in my car becuase I have heard that the car revs higher on the highway due to the gearing, and eventhough I track my car every tuesday, I still need it as my daily driver. Are the RA gears so bad on the highway? Can someone with experience help me out on this one?
...Dan
Dan, I have the RA V6 gearset and I drive 30 miles each way to work on the highway. It doesn't seem bad to me. I think its 3800 rpm at 80mph. That's about 3100 at 65mph. A tad high but not drastic. Shifting gears is much better with the closer ratios. No more first gear grind and the car stays in th power band after each shift. A major improvement.
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Old 10-24-2003, 08:34 PM   #14
garface
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Default Re: Re: Sti ver 2 tranny and options to replace center diff (01RS)

Quote:
Originally posted by Silver Bullet 02
Dan, I have the RA V6 gearset and I drive 30 miles each way to work on the highway. It doesn't seem bad to me. I think its 3800 rpm at 80mph. That's about 3100 at 65mph. A tad high but not drastic. Shifting gears is much better with the closer ratios. No more first gear grind and the car stays in th power band after each shift. A major improvement.
Are you sure you have RA gears? You have a 4.44 rear? Because I have a regular STi Ver. 4 tranny(at least I think it's regular) and I hit 80mph at almost exactly 3800rpm. Weird.
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Old 10-27-2003, 08:47 AM   #15
Silver Bullet 02
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Default Re: Re: Re: Sti ver 2 tranny and options to replace center diff (01RS)

Quote:
Originally posted by garface
Are you sure you have RA gears? You have a 4.44 rear? Because I have a regular STi Ver. 4 tranny(at least I think it's regular) and I hit 80mph at almost exactly 3800rpm. Weird.
I have the STi Ver. 6 that Rallispec sells with the stock 2002 WRX everything else. Maybe the Ver. 4 gearset has a higher 5th gear???
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Old 10-27-2003, 11:08 AM   #16
garface
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So you still have the 3.9 final drive? That should account for the difference.
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Old 10-27-2003, 11:11 AM   #17
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Quote:
Originally posted by garface
So you still have the 3.9 final drive? That should account for the difference.
I didn't change the final drive so if 3.9 is stock then that's what I have. I guess the V6 gears must be lower than the version you have since we have the same rpm at 80mph.
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Old 10-27-2003, 11:13 AM   #18
garface
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Yea, well it's the fact that they are RA gears that makes them lower. STi Ver. 4-6 non R/RA gears are all the same.
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