H2

I bought a 968 that does not show code 220 for it being delivered with Torsen LSD...and when I jack up the rear, and turn one wheel, the other turns the opposite direction...just as some Torsen LSD owners have reported.

At the same time, in deep, soft gravel, when I dump the clutch at 4000 rpm, it doesn't sit around and spin one wheel but both spin straight on equally. It's a sight to behold.

Further, starting out in gravel and hitting the asphault with tires spinning like a bansee, it lays LONG EQUAL tire rubber marks in a straight line.

Further, starting out on asphault and dumping the clutch, it does the same...equal long rubber marks.

Short of trying it on ice and stepping outside the car and watching the wheels spin, I'm not sure how I can prove LSD one way or the other. Ideas?

I just want to know if a PO had it installed or not.

Harvey

jason952

could be, particularly if at some point that tranny had to be rebuilt due to a pinion bearing issue that some had from the factory. not much help...

TRWright

. . .then you do not have LSD.

KuHL 951

The Torsen on my Miata turned the same direction with both wheels off the ground; once you stopped a wheel it would sometimes turn opposite?. I wouldn't call this a definitive test. All Torsens work the same, pure mechanical simplicity, no discs. If he is leaving 2 lines of rubber on pavement with a Torsen he has llimited slip; no two ways about it. Remember what it stands for 'torque sensing', off the ground no torque.

TRWright

I have heard of torsen diffs acting like open diffs when you do the jackstand test; however on my 968 which had LSD-- the wheels both spun in the same direction.

I wonder if it would be possible to unbolt the axles from each side of the tranny and measure the break-away torque from side to side??

J Berk

My S2 does not have the LSD option code...but when I brought it to the wrench for it's initial tuneup post purchase....low and behold...it's got LSD. Guess it could have been a swap at some point....but it's there.

Down side is the LSD clutches are worn....another thing on the 'future to-do list' !

H2

Apparently, there were two kinds of LSD built at the same time....and it's hard to tell which is which. One is Torsen and the other is the clutch type I think. If my car doesn't have LSD, then it certainly doesn't seem to need it in actual use. I'm very satisfied with the traction I'm getting.

Now, my 928 is a different matter. No LSD and one tire will smoke. That's really bad on the track, expecially when you unload weight off one tire in the corner and you look back and see a trail of smoke coming from the spinning tire.

Harvey

Auto_Werks 3.6

Harvey,
You should also check the transmission code... My 944 turbo does not have the LSD option code, but it does have a clutch type limited slip, and the transmission code is correct stating limited slip without a loop cooler.

KuHL 951

Well that just throws a monkey wrench into the whole thread. I thought the 86 was the only year with the standard cooler with or without LSD. I've never heard of an LSD without a cooler; I thought they came as a package option but I only own 86's. BTW what year is your car?

Auto_Werks 3.6

My car is an '87, but it was not a standard item. 944 option stickers are starting to be known for being really inacurate. I have heard several stories of turbo S cars with all the "S" goodies, but none of the options listed in the back. My transmission code is "9U" which I understand was for the optional LSD with no cooler.

billthe3

As for testing if its a limited slip, you could always try drifting. If its easy to drift its a lsd, it its hard its not. lol

KuHL 951

Stop making sense! Sorry I misssed the run today, sounds like it was a good piece of pavement.

billthe3

I would have fallen asleep an hour or so ago if I hadn't been watching a movie and had all these pictures to look at, so my grammar is probably suffering.

BigNNasty

Umm...

Why would you dump the clutch on gravel, and throw rocks on such a nice car? Thats what has ME baffled.

Bottom line, if you can leave two marks, you either have; lsd, locked, or spool. Period. Now go have fun with it, OFF the rocks!

billthe3

Better to dump the clutch in gravel and ding up the rear valence than to dump the clutch on pavement and fry your clutch and/or break cvs.