That's a good article actually.
I like how they explain how the 20 kg/m is calculated.

It's funny how many magic diffs people have in their cars when this would probably be sufficient for most. My favorite is when they buy the fancy magic diff, then have to get the fancier diff controller, then pay even more money to get Pat Richard's fancier map for their diff.

---

Grant Hughes

NoCoast Wrote:
-------------------------------------------------------

> It's funny how many magic diffs people have in
> their cars when this would probably be sufficient
> for most. My favorite is when they buy the fancy
> magic diff, then have to get the fancier diff
> controller, then pay even more money to get Pat
> Richard's fancier map for their diff.
>
> Grant Hughes
> www.nocoastmotorsports.net
> Denver, CO


Who cares what people buy? It's not your money. Maybe the psychological advantage to themselves is enough to justify the cost. Mental component is a big deal in sports.

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Welcome to the cult of JVL drink the koolaid or be banned.

I 100% agree!

i think the 20KG was just fine.

I had to get the "fancy magic diff" because the 5 spd took a hike. The nice thing about the fancy diff is that it unlocks when you let off the gas, so you don't have to work to turn the car. Once you are back on the gas though..it's just the same.

---

Chris

I said it's funny.
Not that I cared what people spend their money on. Trust me, I get more shit for the things I spend my money on than any Subaru owner.
Guaranteed.

---

Grant Hughes

haha, good point.

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Welcome to the cult of JVL drink the koolaid or be banned.

right now this center diff is super-fancy-pants for me, so hopefully it will stay like that for a while!

---

Jon Burke - KI6LSW
Blog: http://psgrallywrx.blogspot.com/

Jon Burke Wrote:
-------------------------------------------------------
> NoCoast Wrote:
> --------------------------------------------------
> -----
> > I have no clue what that means Chris.
> >
> > Grant Hughes
> > www.nocoastmotorsports.net
> > Denver, CO
>
> ditto...
>
>
> for reference, I know the stock WRX center diff is
> 4kg...the stock STI center diff is 12kg....so this
> one >3x stock, and almost 2x the sti.
>
> What I'm still trying to figure out is exactly
> what it does besides puts more power to the
> rear(obviously). what I've found is, on tight
> corners (usually just parking the car), my front
> tires rub a little bit...when that rubbing starts,
> the center diff does something because the car
> pretty much comes to a halt unless you get back on
> the gas...no 'coasting' into parking spaces or
> whatever.
>
> on tight corners my rear diff locks up too, I can
> hear/feel the tires chirping a little. I'm sure
> my stock viscous LSD will be burned up soon, lol.
>
>
> if anyone has any more insight, I'd love to hear
> it.
>
>
>
>
> Jon Burke - KI6LSW
> Blog:
> 'Holy Shit!' @ 4:10



The 12 kg and 20 kg are both Sti units. For the phase 1 center diff (mid '99 and earlier) both 12 and 20 were available. For the phase 2 center diff (mid '99 and later) the 20kg is the only choice.
As far as what 20 kg feet per second/100rpm means? No one knows... Some weird ass Japanese measurement or something.

What does it do? Well the stock center diff is so weak you can damn near consider it open. An open center diff on an AWD rally car can be very unpredictable with the torque trying to hunt from front to rear and rear to front depending on traction, weight transfer, etc. This can make for some fairly crappy handling. With the upgraded center diff congratulations! You now have an actual AWD car, not just a mostly 2wd car. With the stronger center diff you should actually have a reduction in understeer (IF you drive the car right) since you will be finally getting a consistent amount of torque to the rear wheels.