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NedHan79
Nürburgring


Joined: 08 Nov 2018
Posts: 454



PostPosted: Fri Mar 08, 2019 2:02 pm    Post subject: Lsd not working Reply with quote

As per title.

My option codes state that I have 1 but now that I’m using the car in the dryer weather, ive noticed that it’s none existent.

Has anyone changed the plates?
Is it a big job?
Any idea on prices for parts?

It’s just another thing on the to do list and admittedly at the minute, I’m probably not mature enough to have a nice tight diff Floor

But I’d like it right.

As usual, all help welcome
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1262
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Fri Mar 08, 2019 3:16 pm    Post subject: Reply with quote

How have you tested the LSD?
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NedHan79
Nürburgring


Joined: 08 Nov 2018
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PostPosted: Fri Mar 08, 2019 3:19 pm    Post subject: Reply with quote

Tested as in jack it up and spin both wheels?
No. I’ve had to use it for the last few weeks because I sold my daily but it’s going back into the garage over the weekend.
 
  
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The return of Marty Wild
Albert Park


Joined: 04 Nov 2016
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PostPosted: Fri Mar 08, 2019 3:29 pm    Post subject: Reply with quote

Try a lump of sugar!
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1262
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Fri Mar 08, 2019 3:54 pm    Post subject: Reply with quote

Jack up and spin one wheel, other should spin same way if LSD, opposite way if no LSD or really broken, then test the breakaway torque to see how worn it is
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Last edited by asterix_the_gaul on Fri Mar 08, 2019 4:01 pm; edited 1 time in total
 
  
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NedHan79
Nürburgring


Joined: 08 Nov 2018
Posts: 454



PostPosted: Fri Mar 08, 2019 3:59 pm    Post subject: Reply with quote

How do I do that?
I was going on the butt feel as it’s lighting up one wheel very easily in the dry, though cold. In the damp it feels like it’s working a treat.

It’s been a while since I had an lsd in a rwd but when I was younger I would have given them a fair work out in m3’s and the likes.
 
  
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911UK
Porsche Community
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Posts: 10055
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1997 Porsche 993 Carrera 2

PostPosted: Fri Mar 08, 2019 6:21 pm    Post subject: Re: Lsd not working Reply with quote

NedHan79 wrote:
As per title.

My option codes state that I have 1 but now that I’m using the car in the dryer weather, ive noticed that it’s none existent.

Has anyone changed the plates?
Is it a big job?
Any idea on prices for parts?

It’s just another thing on the to do list and admittedly at the minute, I’m probably not mature enough to have a nice tight diff Floor

But I’d like it right.

As usual, all help welcome


Whats the mileage, as LSD's wear out and need replacing as with all parts

e.g. on a GT3 the OEM LSD is only good for 30k km's if youre lucky


Wavetrack is the way forward
https://www.design911.co.uk/fu/prod21559/Wavetrac--Differential-for-Porsche-996-C2---986-Boxster-S/
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NedHan79
Nürburgring


Joined: 08 Nov 2018
Posts: 454



PostPosted: Fri Mar 08, 2019 6:46 pm    Post subject: Reply with quote

The cars on 74k. Full history so I’d say it’s sound enough. No sign of the box ever being touched.

I’m not really interested in a new diff if my own just needs plates.
I’m guessing new plates would be available but also uprated plates would be better.

Haven’t had a google on it yet. Thought I’d ask on here first
 
  
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crash7
Montreal


Joined: 28 May 2011
Posts: 613



PostPosted: Fri Mar 08, 2019 7:09 pm    Post subject: Reply with quote

Unfortunately you cannot buy just the clutch plates from Porsche for an M220 LSD, you have to buy a whole new LSD.

Aftermarket plates are available from Guard in the USA, cost to rebuild is circa £1.5k.
 
  
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NedHan79
Nürburgring


Joined: 08 Nov 2018
Posts: 454



PostPosted: Fri Mar 08, 2019 7:29 pm    Post subject: Reply with quote

That stings a bit. Are the wavetrac ones simply a bolt in job?
 
  
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crash7
Montreal


Joined: 28 May 2011
Posts: 613



PostPosted: Fri Mar 08, 2019 7:41 pm    Post subject: Reply with quote

Yes, but its not a true LSD, its an ATB.
 
  
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2925


1999 Porsche 996 Carrera 2

PostPosted: Fri Mar 08, 2019 7:46 pm    Post subject: Reply with quote

they will be worn out with those miles on.

no idea why people covet cars with the option code.

you don't even need an lsd on a road 996....on track you would enjoy the benefit.
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NedHan79
Nürburgring


Joined: 08 Nov 2018
Posts: 454



PostPosted: Fri Mar 08, 2019 10:26 pm    Post subject: Reply with quote

Just been having a google. Ive found a crowd called racing diffs that do the clutch packs or single Plates if needs be for what seems to be a reasonable sum.
Absolutely no idea what these would be like but there has to be a solution without spending a fortune.
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1262
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Sat Mar 09, 2019 8:39 am    Post subject: Reply with quote

Breakaway torque is supposed to be around 50ft lbs of torque, to measure it accurately you are supposed to have the diff on the bench and use a torque wrench: if you feel it's working now the wet then it's worth testing it to see if it's in spec, it would be kind of irritating to rebuild it and find it functions the same as before.
I guess you could test breakaway torque in situ but may not be accurate¿?
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1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
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NedHan79
Nürburgring


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PostPosted: Sat Mar 09, 2019 9:20 am    Post subject: Reply with quote

Atm I find it’s spinning 1 wheel a lot quicker than I’d ever expected a 911 would do with the weight over the wheels. I know there’s tyres and lack of heat to factor in but it really is bad.
This is gona be way down the list of things to sort but it’s always best to be prepared and have a plan, even if you do get side tracked from time to time.

The gearbox will have to come out at some stage for a clutch and rms so it makes sense to do that all at once but there’s no panic on that.

If it makes more sense at the time to fit a new diff then that’s the way I’ll go I suppose. Id like to get the suspension sorted first.
 
  
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Martin996RSR
Spa-Francorchamps


Joined: 08 Dec 2016
Posts: 332



PostPosted: Sat Mar 09, 2019 10:31 am    Post subject: Reply with quote

I have an OEM LSD in mine and it does work. I do benefit from it in road driving, but I am a total driving nerd and if I were more of a normal driver then it probably wouldn't be worth it.

Ned, something to consider is whether it always spins up the same wheel. If you can get the inside wheel to spin up when turning either way then yes, you LSD is dead. If it will only do it when turning one way, then you could have a suspension problem that's throwing your corner weights out, and allowing a merely tired rather than fully shagged diff to not work to its best.
 
  
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NedHan79
Nürburgring


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PostPosted: Sun Mar 10, 2019 4:36 pm    Post subject: Reply with quote

Quick update. I jacked the car up and turned a wheel. Nothing happened at the other side. Same with turning the other wheel.
My understanding is with an lsd, they both spin in the same direction and opposite in an open diff. But mine does neither so I’m guessing it’s shagged?
 
  
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asterix_the_gaul
Barcelona


Joined: 20 Dec 2008
Posts: 1262
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Sun Mar 10, 2019 8:42 pm    Post subject: Reply with quote

Yes, something is not right there.. My assumption would be it's worn but I'm no expert
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NedHan79
Nürburgring


Joined: 08 Nov 2018
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PostPosted: Sun Mar 10, 2019 10:50 pm    Post subject: Reply with quote

I’ll stick a new diff on the shopping list then Sad
 
  
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cvega
Monza


Joined: 25 Feb 2013
Posts: 207



PostPosted: Mon Mar 11, 2019 12:01 pm    Post subject: Reply with quote

NedHan79 wrote:
Quick update. I jacked the car up and turned a wheel. Nothing happened at the other side. Same with turning the other wheel.
My understanding is with an lsd, they both spin in the same direction and opposite in an open diff. But mine does neither so I’m guessing it’s shagged?


i thought plated LSDs require load in order to work, so spinning wheels jacked up would look like no LSD since it's not locking.. ?
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