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morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

My 924 is running fine..but i get a lot of one wheel spin..and with the narrow body its kind of a killjoy as there is a lot of noise happening but not much side/slide going on.
I want an LSD gearbox....preferably a factory 924 NA gearbox with LSD.
I think these are super rare as they were only an option for the NA.
What are the identifiers for such gearboxes?
Anyone have any idea of where to find such a thing?
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Fifty50Plus · Posted: Tue Mar 31, 2020 8:28 am Post subject:

Morghen, I have a '79 NA race car. It came with the M471 package and had a limited slip. I wanted a locked snailshell gearbox so I traded the LSD with Dan (Ideola) for some parts and a stock dif. I then welded the spider gears in the stock dif and have it in the car. The LSD is supposedly the same as Porsche put in the 915 gearbox for the 1972 and later 911s.
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

kevingross · Joined: 15 Apr 2015 Posts: 35 Location: Stow, MA, USA

They exist but are scarce. For the snailshell (016/Y or Z, or G31.01 or .02) made by Getrag, the same LSD as used in the 911 series type 915 transmission was used. They are all but impossible to find and when you find one, expect to pay a whole lot.

The 088/A and 016/R, build by VW, used the same LSD as the 924S and 944-series cars. They are becoming scarce but can still be found for rational costs.

There are good aftermarket options for both transmission families, the best of which is Guard.
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Kevin
Catellus Engineering, Inc.
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Cedric · Joined: 27 Aug 2004 Posts: 2807 Location: Sweden

There's a guy here in sweden who lightly modified some kind of audi torsen diff to make it fit in the std 924 box, that's probably the cheapest way. Otherwise it's just to fork up the $.

But its very setup dependent, as my car sits now i hardly need an LSD for the street even with 1 bar boost. I have a quaife on the shelf, but if i never drove on a track i wouldn't bother, the grip is good and when it starts sliding its not really the mega 1 wheel spin show

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1980 924 Turbo
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morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

I'm only interested in the Audi type LSD gearboxes.
There is a company in UK that sells limited slip diffs for like 800 pounds or so.
That's cheap and all good but the Audi type gearbox you have to split open to exchange the diff....and if you dont do a good job you end up locking it or breaking it.
Thats why i asked about a factory LSD Audi type 924 NA 2L gearbox

I guess i'll have to live with the one on the car for now.
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Raize · Joined: 18 Sep 2013 Posts: 447 Location: Scotland

Weld it!

924RACR · Posted: Wed Apr 01, 2020 12:08 am Post subject:

We run an Audi box on our '79 NA racecar. We had a Porsche transaxle specialist swap in a used factory LSD from a 951.

It's still pretty used/worn, really wants a rebuild with new clutch packs, but if we feed it the really sticky Redline 75W90NS, it locks up well enough for the little 2.0L. Otherwise I've had it spin the inside wheel, especially on paint. It's that worn! LOL

So if you have a line on someone who knows how to shim up the diff, and the right tools to do so, just find a used diff from a 944/951...
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
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kevingross · Joined: 15 Apr 2015 Posts: 35 Location: Stow, MA, USA

Yeah, unless someone's serviced them before, they are all beat to snot at present and not working as intended. I rebuilt an '85 a couple weeks ago that had basically no break-away torque. The good news is that the service parts are available and not horribly expensive: clutches, outer (shim) plates, etc.

The only thing unavailable for the VW boxes' LSD is the thrust washer under the side gears. I have a small remaining pile of new ones and a stock of good used ones to draw from. The issue with these washers is the pressed-in tab, that creates (doh!) a stress riser that in turns leads to cracking.
_________________
Kevin
Catellus Engineering, Inc.
http://www.catellusengineering.com/
catelluseng@gmail.com