LSD in 997 GTS
Discussion
The gearbox is the Aisin made unit. Theres no clutch pack available either from Porsche of aftermarket for the LSD in these things. Porsche also won't simply sell a replacement LSD either. I guess you are meant to buy a whole new gearbox 
On the plus side the LSD is there to look good on paper rather than actually doing much as is the way of much of the newer cars. The electronics are meant to do its job in the main so its there simply to put a curl in peoples beards.
I believe that you can put a replacement unit from guard in though if you are serious about it.
On the plus side the LSD is there to look good on paper rather than actually doing much as is the way of much of the newer cars. The electronics are meant to do its job in the main so its there simply to put a curl in peoples beards.
I believe that you can put a replacement unit from guard in though if you are serious about it.
Neil, thanks for that. So basically when it's worn out, that's it. Either replace it with another unit or let it run as an open diff?
Any data on what the pre-loads and ramps are on it, anyway?
The car has 45k on it. I look it in because of occasional graunching from 1st to 2nd. First plan of action is to replace the clutch.
Any data on what the pre-loads and ramps are on it, anyway?
The car has 45k on it. I look it in because of occasional graunching from 1st to 2nd. First plan of action is to replace the clutch.
No Problem.
Yes, thats the case at the moment. Once its done you run it as an open diff or replace the whole LSD.
The comment about replacing the whole transmission was partially in jest but AFAIK Porsche don't list an LSD for that gearbox so who knows what you are meant to do in this case if you physically need to stick with Porsche parts.
I suppose the real answer to that leads into the reply to the second part of your question.
As for preload and ramp rate, I assume its the same spec as the LSD used in the Caymans etc etc. This is a zero preload diff (i.e. it has no preload at all) and the ramps are essentially nothing. This LSD is not designed to actually do much in the way of any locking up - so presumably this is how one gets round the wearing out issue and the replacement issue.
It won't wear out as it does nothing in the first place and with zero preload there will be no way to test if its actually worn. Simple!!
Its really just there to look good on the spec sheet. The electronics are doing the diff work via traction/braking things.
Yes, thats the case at the moment. Once its done you run it as an open diff or replace the whole LSD.
The comment about replacing the whole transmission was partially in jest but AFAIK Porsche don't list an LSD for that gearbox so who knows what you are meant to do in this case if you physically need to stick with Porsche parts.
I suppose the real answer to that leads into the reply to the second part of your question.
As for preload and ramp rate, I assume its the same spec as the LSD used in the Caymans etc etc. This is a zero preload diff (i.e. it has no preload at all) and the ramps are essentially nothing. This LSD is not designed to actually do much in the way of any locking up - so presumably this is how one gets round the wearing out issue and the replacement issue.
It won't wear out as it does nothing in the first place and with zero preload there will be no way to test if its actually worn. Simple!!
Its really just there to look good on the spec sheet. The electronics are doing the diff work via traction/braking things.
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