my rear LSD

long time a go, one mechanic say me that no is in good condition, but I don´t sure

http://www.youtube.com/watch?v=f5UUpr_0Tgs&feature=youtu.be

what do you think ?

 

Silly rabbit trips are for kids

 

just wanted to share, but I see that this forum can not talk then.

sorry for the inconvenience, but I will not bother

 

Awesome! Diff appears to be in good order. (might want to check rear tires ) I love a good donut. Sounds great too.

Dave

 

No NO I like !!!! You drive like I do

 

Mechanic can be right. Your diff can function as your video shows but how does it function? breakaway torque effects how your diff functions in our kinds of diffs that have clutch discs which you can change for changing or restoring charactoristics. What you show in the video is only one aspect of a LSD.

 

thanks ! you can say me where bought the disc´s please ?

 

You don't need to buy new discs if the friction plate were double stacked. What you will need to do is open the differential and reposition the friction plates. Page #8 of this thread shows what I'm talking about. http://ferrarichat.com/forum/showthread.php?t=102751 You will stagger the plates. One friction plate then one cross plate, friction plate, cross plate.

Y en español

No es necesario comprar nuevos discos si la placa de fricción fueron apilados doble. Lo que hay que hacer es abrir el diferencial y la posición de las placas de fricción. Página #8 de este hilo muestra lo que estoy hablando. Serás las placas. Una placa de fricción entonces una cruz placa, placa de fricción, placa de cruz.

 

This may not work as the amount of pre-load that a differential has is determined by the stack height. When the friction discs start to wear, your stack height changes and the differential overall will not be quite the same.

LSD's especially stock ones, are typically known to wear rather quickly in competition because they are not really built with the intention of be driven hard on. They are there to add stability in street applications, and as such usually have a deficiency in plates, which can be addressed in a couple of different ways.

Good luck regardless, let me know if you have any questions as this is pretty much what I do.

 

It works Erik, that thread is my set up in my gearbox right now.

The reason it works is because the two friction surfaces that were facing each other are pretty much untouched. So when they are separated, and staggered, you have a fresh set of friction surfaces in contact with the cross plates. It's like having double sides sandpaper. When one side gets worn out, flip it over and you have brand new sand paper. Same deal here. But in this case you actually have four friction surfaces. The 2 worn surfaces, and the 2 new surfaces.

Now he's not going to save on labor, because you do have to remove and open up the gearbox. The differential also needs to be disassembled to do this. But, if he is having a hard time finding new friction rings, or getting them resurfaced, it is an option.

 

Erik,

"That's what you do"? Awesome....I know what a diff does from a wiki perspective and I understand why we have LSD's. What I don't understand is how a LSD functions for road course racing. I'm interested in that because I road racing with a group in corvettes. The only data point I have for racing is that Quaife's and OS giken's seem to chop 1 sec off laptime on our roughly 10-15 turn 3 miles tracks, I guess because you can get the power down better than stock diffs or ???? The OEM LSD's are like the ferrari described here with plate clutchs and some preload. The quaifes are those torsen worm gear things, and the OS Gikens are a clutch plated like the OEM's. Can you shed some light?