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Old 11-05-2012, 05:28 PM   #1
Zach Bitzer
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Default Suby Guru Needed. 05 LGT trans+ej257 block. Flywheel fitment?

Ok, here goes:

I'd first like to say thanks to SPEC and Adam at TH motorsports for all the help.

My Dilemma. I have a 2005 legacy GT, 5mt. The previous owner had installed an 06 WRX flywheel, and a ACT clutch. I ended up busting a finger off the pressure plate.

So I ordered a SPEC stage 2 (part # SU252) clutch. Not realizing that the LGT for that year was dual mass, I found out I couldn't use the 06 WRX flywheel I pulled out of the car.

But here's the problem. The car DOES have an 06 STi motor. Adam at TH said they do have a flywheel, but says it specifically bolts onto a ej255.

So I call SPEC. They tell me the patterns are the same, and that the crank placement and fitments are all the same, and that the flywheel WILL bolt up, but said theres a different in bore size in the LGT flywheel (part # SU25A) and an STi flywheel; But the car had an 06 WRX flywheel in it previously.

SO, does anyone know if I'll have fitment issures? If there is excess material in the bore size, and the lgt flywheel needs to be opened up, I will do it myself. SPEC wasn't real specific on it. They said it might cause interference? But if it directly bolts up, and the crank specs are all the same I don't see why there would be.

Any help? lol
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Old 11-11-2012, 01:03 PM   #2
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Anyone? I saw a thread saying the only real difference in an ej255 and 257 is the dish of the pistons..and the heads.
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Old 11-12-2012, 10:22 AM   #3
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The 2005 - 2006 Legacy GT is the only car that used the Dual Mass Flywheel. The cranks are all the same, so don't worry about which engine you have in the car. Simply put, you do not want to use the Dual Mass flywheel (very expensive), so you just need a 2006+ WRX flywheel, and the clutch that matches - 2006+ WRX.

The rule of thumb is that Transmission determines the clutch that you need. The clutch determines the flywheel that you need.

If you are still using the Dual Mass Flywheel, you will most likely have to switch out the flywheel bolts for those that also go with the 2006 WRX flywheel as well.

Good luck with your project.
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Old 11-12-2012, 05:31 PM   #4
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Quote:
Originally Posted by Zach Bitzer View Post
Anyone? I saw a thread saying the only real difference in an ej255 and 257 is the dish of the pistons..and the heads.
What FlatironsTuning said about the 06 wrx clutch is true, the previous owner did it right by switching to the singlemass flywheel. I would return the clutch if you can and get the appropriate Spec one to match the single mass flywheel.

But, the question here is, why are you changing the clutch out?? Was the 06 wrx one starting to slip or did you just want to upgrade because of additional power you would be running?

Also, it is the tranny that determines what clutch to run whether pull style or push style with yours being a push style. Then, obviously the right clutch for the power level. What Adam said about the flywheel he told you about specifically bolting to the ej255 is also true only because it is a dual mass one and the fact that the 05-06 legacy gt uses a dual mass one. But, the dual mass flywheel sucks rear...

So, get the right Spec clutch to match the single mass flywheel and you will be set
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Old 11-12-2012, 05:33 PM   #5
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Quote:
Originally Posted by FlatironsTuning.com View Post
The 2005 - 2006 Legacy GT is the only car that used the Dual Mass Flywheel. The cranks are all the same, so don't worry about which engine you have in the car. Simply put, you do not want to use the Dual Mass flywheel (very expensive), so you just need a 2006+ WRX flywheel, and the clutch that matches - 2006+ WRX.

The rule of thumb is that Transmission determines the clutch that you need. The clutch determines the flywheel that you need.

If you are still using the Dual Mass Flywheel, you will most likely have to switch out the flywheel bolts for those that also go with the 2006 WRX flywheel as well.

Good luck with your project.
The 06 and maybe the 07 impreza NA RS also used the dual mass flywheel just to let you know
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Old 11-13-2012, 07:33 PM   #6
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Quote:
Originally Posted by subi400 View Post
What FlatironsTuning said about the 06 wrx clutch is true, the previous owner did it right by switching to the singlemass flywheel. I would return the clutch if you can and get the appropriate Spec one to match the single mass flywheel.

But, the question here is, why are you changing the clutch out?? Was the 06 wrx one starting to slip or did you just want to upgrade because of additional power you would be running?

Also, it is the tranny that determines what clutch to run whether pull style or push style with yours being a push style. Then, obviously the right clutch for the power level. What Adam said about the flywheel he told you about specifically bolting to the ej255 is also true only because it is a dual mass one and the fact that the 05-06 legacy gt uses a dual mass one. But, the dual mass flywheel sucks rear...

So, get the right Spec clutch to match the single mass flywheel and you will be set

I actually busted a finger off the pressure plate on my ACT/06 WRX flywheel setup

It was also slipping a little. All is sorted now! Spec flywheel to go with the clutch. Thanks!
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Old 12-04-2012, 09:20 PM   #7
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If you guys don't mind, I have a similar issue right now. Just swapped the glass '02 trans out of my WRX for the LGT trans ('06). Different style clutches, yes. different flywheel, yes. My issue is I don't know what year to get the flywheel from. The 06 WRX looks like the best candidate, but I don't know if perhaps there are better options I am missing.

Ideas?
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Old 12-04-2012, 10:36 PM   #8
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Quote:
Originally Posted by Swimminginblues
If you guys don't mind, I have a similar issue right now. Just swapped the glass '02 trans out of my WRX for the LGT trans ('06). Different style clutches, yes. different flywheel, yes. My issue is I don't know what year to get the flywheel from. The 06 WRX looks like the best candidate, but I don't know if perhaps there are better options I am missing.

Ideas?
That is the right answer because it will match the tranny. You have the correct rear diff to go with it as well?
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Old 12-05-2012, 01:59 AM   #9
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the previous owner did it right by switching towards the single mass flywheel. I would return the clutch if you possibly could and get the right Spec one to match the single muscle size flywheel.

locked out of car

Last edited by Haick4; 12-08-2012 at 12:09 AM.
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Old 12-05-2012, 02:41 AM   #10
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Quote:
Originally Posted by Swimminginblues View Post
If you guys don't mind, I have a similar issue right now. Just swapped the glass '02 trans out of my WRX for the LGT trans ('06). Different style clutches, yes. different flywheel, yes. My issue is I don't know what year to get the flywheel from. The 06 WRX looks like the best candidate, but I don't know if perhaps there are better options I am missing.

Ideas?
I would get the 06 wrx clutch and flywheel and call it good Are you running stock power or do you have upgrades? How much torque are you putting down then?
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Old 01-27-2013, 10:06 AM   #11
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Quote:
Originally Posted by FuJi K View Post
That is the right answer because it will match the tranny. You have the correct rear diff to go with it as well?
Yup! I got the rear-end and all 4 axles. I guess I will just have to bite the bullet and change the set up. I ended up (temporarily) putting in a clutch and flywheel from an 02 legacy. It was local, cheap, and I had to move the car from our shop. Everything went in alright and I figured the clutch would hold better... but It slips badly and has to go. Thanks for the pointers guys!
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Old 01-27-2013, 10:11 AM   #12
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'02 Legacy is NA. That clutch won't hold the power. Drive normally until you get the right one in.
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Old 01-27-2013, 10:14 AM   #13
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Originally Posted by subi400 View Post
I would get the 06 wrx clutch and flywheel and call it good Are you running stock power or do you have upgrades? How much torque are you putting down then?
Running about 275bhp and I don't know where the torque curve peaks. I bought the car recently and the previous owner had nearly completed the first round of upgrades (headers and full stainless exhaust, egt delete, rebuilt, trimmed, and balanced turbo, 02 sensor delete, and some intake and computer tuning). I am new, but learning. The plan is to fix up that clutch and bring her in for a real tuning this week.
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Old 01-27-2013, 10:21 AM   #14
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Quote:
Originally Posted by FuJi K View Post
'02 Legacy is NA. That clutch won't hold the power. Drive normally until you get the right one in.
It's just a tease with this clutch. You can almost have some fun and then it goes. It has been hard to stay out of it, but your right. It doesn't hold power worth a damn. I have wondered though, if its possible that the 05+ LGT rod is a touch too long? putting just a little too much pressure on the fork and never letting the clutch apply friction fully or as it is intended? We just used the slave the transmission came with. Do you guys know if any of them are longer/shorter?
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Old 01-27-2013, 10:39 AM   #15
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what is it..06 through '10 wrx flywheels? or, since I know a clutch man in town, is it possible to have him rebuild that '02 legacy clutch with better friction material and throw in some heavier springs to accommodate my intentions? the only reason I ask is that I understand that could greatly improve the "grip" of the clutch.
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Old 02-01-2013, 12:41 PM   #16
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bought the '06 WRX clutch from Ebay (used) and am having it rebuilt for a few more dollars. the clutch and flywheel cost about $100 and the rebuild to stage 1 or 2 is a little more than that. The clutch pressure plate fit right onto the flywheel from the my '02 WRX. Thanks for the help folks!
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