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Old 02-27-2003, 04:01 AM   #1
Scooby Specialist
Member#: 33246
Join Date: Feb 2003
Chapter/Region: MAIC
Location: Where ever I lay my hat is my
1993 Legacy L+ AWD
Phoenician blue met./blue

Default STi rear diff question...

Does anyone know why Subaru would have spec'd the STi with a mechanical LSD in the rear?

The standard WRX and Legacys all have viscous LSD's in the rear.

What kind of performance/functional or durability improvement can be expected, if any, with the mechanical rather than viscous LSD rear end?


- Janq
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Old 02-27-2003, 07:10 AM   #2
Scooby Specialist
Member#: 4229
Join Date: Feb 2001
Location: Dublin, OH, USA
2003 S2000
Did someone say track day


by mechanical I assume you mean plate type? Like a Kaaz or something similar?

I can't remember right now if they said it would be a suretrac diff in the rear or not and I'm too lazy to look.

Anyway, the plates are always meshed so the reaction time is quicker than a viscous diff. Also I'm not sure you can tune a viscous diff the same way you can a mechanical diff. Meaning different lockup on decel and accel for a 2 way which it probably doesn't have. But even if it's similar to a 1.5 way diff I think it's quicker reacting and more tunable than a viscous diff would be the reasons I could come up with.

Anyone else?
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Old 02-27-2003, 11:54 AM   #3
Member#: 456
Join Date: Oct 1999
Chapter/Region: NWIC
Location: Redmond, WA, USA
2008 Forester XT
Steel Gray Metallic


Suretrac front diff, perhaps a little less aggressive but a good choice for a front diff for a serious but streetable car.

The rear diff is a multi plate mechanical clutch type.

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