Lord_Galva

What's the big deal?? How much of a difference in handling does a LSD really make?

Cervi

Wikipedia is your friend.
http://en.wikipedia.org/wiki/Limited_slip_differential

JET951

on the road its makes the car fun, on the track it is essential. i had an open diff in my car for the first few track days a few years ago. on a 1m14sec track with the 80%(80%accel,60% decel, clutchtype 4 plate) motorsport LSd i put in i instantly went down to 1m11sec. instead of not being able to put power to the ground and having the inside wheel spinning up a storm, the car is extremly stable on both power and over run at the limit. i would say it was one of the best mods i have done.
and on the 968 we use a 6 plate motorsport LSD.

Damian in NJ

Big difference in hairpins for me, you can really feel the car hook up.

Lord_Galva

Dang. Now I'm interested. How much work is involved go install one on a 968's 6speed?

frog76

does anyone have any comments on the clutch pack diff versus the torsen 968 diff when it comes to the race track ?

Thanks
Craig

JET951

clutch is the only way to go. torsen only works im one direction, thats acceleration, that means as soon as you get scared going hard through a corner and back off(even a little bit) there is a massive weight transfer to the inside back wheel. well on other word your going to spin.
where as with a proper motorsport clutch LSD if you happen to back off the rear wheels will still be locked which gives you complete control. in my 951 i have had an open diff to start with then i had a
80%accel80%deccel and i finally changed it for a 80/60 and this seems to suit my car and my driving best.
torsens come into their own when doing autoX or motokhana. they power out of turns very well and you can spin the car on the spot when you back off going around a witches hat. good for 180 degree turns etc
sean

Jason Judd

I've got the Porsche Motorsport clutch type unit, and love it. Under decel the car is still hooked up really well.

I did have the Torsen unit beforehand.

Jason

boost feen

Anyone have any clues on how to tell which LSD the '92 968 transaxle diffs have without taking them apart! Because I have a '92 968 with 220 option code that feels like a clutch type when accelerating hard and on decel. But I would like to know for sure, I know the factory kept records but who knows how to really find out, the transaxle code should tell me the build?

Jason Judd

Pretty sure they were all Torsen units...I didn't think the factory used the clutch types in production.

Jason

boost feen

There is several well respected sources that have verified that the factory used either ZF or Torsen LSD in 1992 968's. Then somewhere in the 1992 build year they went to only Torsen LSD units, and eleminated the ZF from the option code list!

So who knows how to really tell unless you dissasemble your transaxle?

Lord_Galva

Is it easy to install a LSD yourself?

Dave in Chicago

I just don't get the "lock up on decel" thing with an ABS car...

Can someone help me understand the benefit? Perhaps I'm just being a bit slow.

cyinisis

With an open differential when you brake hard into a turn, the inside wheel will have no torque, and will not be able to defeat the ABS system, the outside wheel will have all torque which wil allow it to overpower the brakes in an ABS and slip fine, so each time the brakes pulse, one wheel will still spin, and one wheel will lock, which will cause you to over-steer and possibly spin.

With the 2-way or even 1.5-way LSD, both wheels will have equal torque and equal ability to overpower the brakes.

JimV8

Cars with weak power don't suffer from an open dif, however if you track or if you do something completely ridiculous like a 5.7 LS1 then you need an LSD.