20kg sti center diff - Subaru Forester Owners Forum
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post #1 of 10 (permalink) Old 03-27-2009, 04:25 AM Thread Starter
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20kg sti center diff

Will this swap into the stock FXT trans?
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post #2 of 10 (permalink) Old 03-27-2009, 04:27 AM
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Should. Head had one in his. Could also consider the Cusco Tarmac...
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post #3 of 10 (permalink) Old 03-27-2009, 04:29 AM Thread Starter
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post #4 of 10 (permalink) Old 03-27-2009, 04:52 AM
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You need the later one piece design, 97 on I think.

Simon

98 s-turbo now breaking for spares :icon_cry:, now driving a BMW 320D M-sport :raspberry:
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post #5 of 10 (permalink) Old 03-27-2009, 06:00 AM Thread Starter
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"Center LSD: I am very interested to try the PPG Torsen center LSD but have not yet had the chance. I suspect it may be an excellent track option. I would avoid using a 20kgf center viscous except for gravel, snow, or ice...or maybe straight line drag racing. On high speed tracks with no tight corners it may be OK but it will be counterproductive on tight tracks or autox. The Cusco Tarmac gear is worthwhile only when you have good front and rear LSD's to back up the fact that it is an open diff."

From the Unabomber thread on NASIOC.


Doesnt look like this would be something I would want to invest in.
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post #6 of 10 (permalink) Old 03-27-2009, 07:20 AM
 
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Simon - 99 for the US model year. That was the swap to the machined housing.

Will it fit? Yep. Would you want it? Nope.

Terrible for autox. Nothing but a bunch of understeer.

The Cusco Tarmac is fine, but becomes a FULLY OPEN DIFFERENTIAL. There is no limited slip functionality in that differential.

09 SWP Outback 2.5XT 5MT 263whp, 337 lb-ft
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post #7 of 10 (permalink) Old 03-27-2009, 07:30 AM
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I have one of these in my rally car and it's brilliant!! for rally....
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post #8 of 10 (permalink) Old 03-27-2009, 08:25 AM
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SO understeer is the big downfall? I do tons of snow driving and I'd love more traction.

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post #9 of 10 (permalink) Old 03-27-2009, 08:28 AM
 
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Understeer is the big downfall, yes.

I doubt you do enough snow driving to justify it. If you absolutely don't care about backroad performance, then it'd be a good investment.

09 SWP Outback 2.5XT 5MT 263whp, 337 lb-ft
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post #10 of 10 (permalink) Old 03-27-2009, 08:32 AM
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I definitely enjoy backroad driving a lot more often than I drive in snow and offroad.

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