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05-06-2010, 12:46 PM | #1 |
Scooby Specialist
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Join Date: Apr 2004
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RMIC
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Vehicle:2004 WRX 99ESP - Drew =) |
Rear diffs... Subaru Viscous versus Subaru Clutch type
I had thought the rear diff on the 04 wrx was open so I was looking for a new rear diff for better auto-x ability. I guess long story short it's viscous. There's a chance I could swap in a old (89ish) xtr clutch type rear lsd in my car. Would it be worth it? What would be the advantages or would there be any?
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05-07-2010, 05:52 AM | #2 |
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Yes you could swap one in if you change the ring and pinion. If it was in good shape the advantage is that you wouldn't spin a rear wheel while it was in the air as much as you do now. That said- finding one in good shape will probably be a challenge. I think you'd be better off getting a new clutch diff and having it installed in your current housing.
A clutch rear is the way to go in a Subaru. Between the tendency to dog leg through corners and the weak viscous LSD that comes stock the acceleration difference coming out of corners and the added ability to get the car to rotate under throttle with a clutch rear is worth it. |
05-07-2010, 07:53 AM | #3 |
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Seconded. The viscous, especially if aged, is essentially an open diff. The clutch diffs are great. When I bought one from a late eighties Subaru XT a year or two back, it looked great inside too, but they are hard to come by at all these days because the Datsun guys love them too. YMMV, but it's worth it if you can find one.
-N |
05-10-2010, 11:38 AM | #4 |
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I can't really say my current viscous is aged... but it does have some races on it and 60k miles. The clutch type that's available to me is old... and who know's how many miles. I haven't opened it yet. Are there syncros and or discs in there I should look for signs of wear?
Would the clutch type just have faster engagement for the rear so I can stop tripoding? I'm bad with mechanics so I guess I don't really understand them yet. I would have to swap my rear axles to run it so it's kind of a pain. |
05-11-2010, 03:43 PM | #5 |
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A clutch type would engage, whereas the viscous would delay engagement and then not really engage too strongly. The clutch discs themselves could be visually inspected for wear. They need friction. They can be resurfaced/replaced if necessary.
-N |
05-12-2010, 11:08 AM | #6 | |
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When shimmed for a little more preload, the clutch diff locks up very quickly. Just enough give to keep from breaking axles in grid/paddock and pushing out the backdoor of each corner entry, and strong enough to increase your midcorner speed by 3-5mph (be it on 4, 3 or 2 wheels).
Replacement clutches and belleville springs are still available, but a quick treatment with a media blaster will freshen up anything worn.....very-very effective and cheaper than new guts. Jay Quote:
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05-13-2012, 11:38 PM | #7 |
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Which models came with a stock rear clutch type?
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05-14-2012, 12:20 AM | #8 |
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V1/2, some 3/4, and newer STi.
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05-14-2012, 12:28 AM | #9 |
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yeah but some from the late 80's and early 90's had them too right? From what I understand it's hard to find the parts to rebuild it anyways?
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05-14-2012, 12:48 AM | #10 |
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Clutch are best, but you need to remember that you need matching driveshafts as well.
Later models like yours will most likely be plug in (part of the driveshaft splines push into the diff), while earlier will be plug out. |
05-14-2012, 10:25 AM | #11 |
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Yeah my driveshafts are plug in.. However without any source for a rebuild it seems pointless.
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