Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - So what is the Big Diff? (pun intended sorry)

DarkSunrise · 10-21-2012, 10:21 AM

I remember back when I used to own a GR STI, it had helical front and torsen rear LSDs. This setup worked ok, but you could still get the car stuck in snow/ice if either the left or right half of the car had no traction. As mentioned above, a torsen (or helical) differential will not distribute torque to the slipping wheel if it has 0 traction. With my FR-S, I've spun my inside wheel applying power in hard turns on rainy days. Just a limitation with the torsen-type LSD.

Some of the older GD STIs (I think 04-05) had a clutch-type LSD in the rear. Not only worked well in snow/ice, but apparently made a large difference in reducing understeer as well.

10-21-2012, 10:21 AM	#23
DarkSunrise Senior Member Join Date: Apr 2012 Drives: 22 BRZ (Previously 13 FR-S) Location: USA Posts: 5,798 Thanks: 2,187 Thanked 4,243 Times in 2,221 Posts Mentioned: 48 Post(s) Tagged: 2 Thread(s)	I remember back when I used to own a GR STI, it had helical front and torsen rear LSDs. This setup worked ok, but you could still get the car stuck in snow/ice if either the left or right half of the car had no traction. As mentioned above, a torsen (or helical) differential will not distribute torque to the slipping wheel if it has 0 traction. With my FR-S, I've spun my inside wheel applying power in hard turns on rainy days. Just a limitation with the torsen-type LSD. Some of the older GD STIs (I think 04-05) had a clutch-type LSD in the rear. Not only worked well in snow/ice, but apparently made a large difference in reducing understeer as well.