mikymu

Other option is using floor jacks but I like the wood blocks better for certain long projects such as LSD rebuild ... until I can convince wife to get a hydrolic jack

cfjan

Yeah, but you wouldn't use the floor jacks to support the car, right? You would still need to put the car on some jack stands... or you actually trust your floor jacks enough to work underneath the car that way?

TRAKCAR

I suspect that a diff is the first mod....

mikymu

Jack stand is better than a floor jack but this is what I like to have in my garage



I think 2010 RS' LSD has a different design compare with 7.1 RS. Better check with Porsche first ....

cfjan

That's for sure.. would love a lift in my garage... !!

GTgears

I'll have one in my shop in the next week or two. I'll report back with what I find when I open it up.

Regards,

Matt

mikymu

Sounds great Matt. That will help answer the question for alot of people with the "new" LSD. What would you say if we found out Porsche (VW)finally smarten up and use something similar to your GT internals? lol

carrering

i'm wondering how the "stock" RS diff is prepared for the 24hr race. surely it went open just during first lap of VLN race or even before.

mikymu

Interesting question. Let's hope it will fare better than 7.1 LSD

GTgears

Stranger things have happened. But if you head over to the Cayman S forum and look at my "devolution" thread you'll see what they are using for internals on the Cayman/Boxster LSDs as well as the PDK. I'm not terribly optimistic that they will be going "more" aggressive in the near future.

The motorsports internals, on the other hand, are very similar to our parts. In fact, the older mk1 996 GT3 Cup Car motorsports LSDs were still a 4 plate design and while they aren't very available here in the states, a lot of people in Europe and the UK rebuild their street LSDs using those early Cup Car plates.

Something that a lot of people don't really understand is that while the 8 plate Cup Car LSD is 120ft/lb or more when it's new, it's actually a "low" preload LSD. The reason I say this is because they use a very thin belleville washer with very little crown height or spring rate to it. The vast majority of that 120ft/lbs on that differential is coming from the friction between the plates, which are not only stickier than the street car's brass plates, but there's twice as many friction surfaces.

We do the same thing with our LSDs. When the number of plates goes up, the actual preload (and belleville washer thickness) goes down. If I build a 4 plate LSD to 120ft/lb is will generally use our thickest, 2.2mm, belleville washer. If I were to build an 8 plate with something like that, you couldn't even turn the thing over.

pete95zhn

What's the difference between these parts, or does anyone know the last one:

996 332 983 9A -GT3 cup LSD
996 332 983 9B -GT3 street LSD , 40/65%
996 332 983 9C - what's this??

How many friction plates does they have, all 4, all 8 or something completely different??

GTgears

9c is a late 996 Cup Car LSD. 8 plates with 45/65% locking. Also, all the diffs I have had through here recently or have on my shelf are 083, not 983 in digits 7-9.

pete95zhn

OK, thanks!

OldGuy

Why does Porsche put in a part that is so easily and quickly rendered useless? I dont understand. the LSD diff is a $500 option on some cars and why pay it if its gone in one track day?
Whats the point?

Kaizu

This LSD buster test is not accurate, the LSD needs load to work.