voodoo51

My gearbox will be rebuilded in next 3 weeks (synchros, shift sleeve). My shop asked do I want to encrease amount of the inner discs (now there are 2 inner discs) for better driving.
The car is daily driver and very very rare trackdays.

What do you think?

And also how many inner discs should be in stock Limited-slip differential? Maybe previous owners changed it.

Thank you.

Sergey

GTgears

Depends on how your shop is referring to it. I always refer to total number of clutches. Some refer to how many per side.

Originally, factory ZF lsds were assembled as steel, clutch, clutch, steel, bell washer. That is one side and is effectively 2 clutches for the whole unit. For performance you can retune it as clutch, steel, clutch, steel, bell washer. If you don't track it, you can leave the original configuration.

voodoo51

GTgears
Thank you!
Could you please help me to understand this with part numbers?

Do you mean that original configuration is:
disc with external splines (1,9 or 2,0 mm) - 91733255210 or 91733255211?
inner disc 2,0 mm - 92833255100
inner disc 2,0 mm - 92833255100
disc with external splines (1,9 or 2,0 mm) - 91733255210 or 91733255211?
thrust washer - 90133256111

And if I retune LSD as clutch, steel, clutch, steel, bell washer - what changes in street driving (not track)?

I have another car for trackdays.
As for me Porsche 930 is too expensive to repair and that's why it is daily driver (maybe just 2 or 3 trackdays a year).

voodoo51

In my LSD there is only one inner disc (clutch) per each side (in total 2 inner discs in LSD). Is it normal?

As I see on this picture stock LSD must have 2 inner discs (clutches) per each side. Am I right?
http://www.autoatlanta.com/porsche-p...section=305-05

GTgears

Yes,inners are clutches. Only 1per side means someone just wanted to save a few bucks on the previous rebuild. Same effective lock as stock.

voodoo51

GTgears
Do you mean that my LSD (with only 2 cluches) is the same effective as the stock LSD with 4 clutches?

GTgears

Yes, when configured like in the drawing you posted (how I initially described). When you put a pair of clutches against each other you are reducing the number of effective faces.

However, if it does have just 1 clutch per side it should have an extra steel plate to make up the extra gap and keep the stack height correct.

voodoo51

Thank you. Very interesting!

Could you please determine part number of #55 on this picture?
http://www.autoatlanta.com/porsche-p...section=303-05

GTgears

That's the removable piece that the idler gear for reverse rides on. I'll look up part number tomorrow when I'm not on a phone.

GTgears

930.302.269.01 PET calls it a sleeve.

voodoo51

Thank you!
It seems to be not available for order. That is ok, my shop will make this part

GTgears

That's a pretty complex part. You must have a really very good machine shop!

voodoo51

I hope so. Anyway I don't have a choice. This part is not available now.

GTgears

Try Gary Fairbanks in CT.

voodoo51

I am in Russia