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Welded differential

 
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Raize  



Joined: 18 Sep 2013
Posts: 81
Location: UK

PostPosted: Sun Dec 03, 2017 10:56 am    Post subject: Welded differential Reply with quote

Has anyone welded the differential on a 924? Is it even possible with our transaxle gearboxes? What's the handling like?
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1545
Location: Somerset, UK

PostPosted: Sun Dec 03, 2017 9:56 pm    Post subject: Reply with quote

Itís been done on drift 944ís. Handling will be very sideways
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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Raceboy  



Joined: 01 Mar 2004
Posts: 2292
Location: Estonia, Europe

PostPosted: Mon Dec 04, 2017 2:57 am    Post subject: Reply with quote

I used welded diff on my Gulf, it was better than Torsen I used before. At least on the tracks I used (faster tracks).
On very narrow ones could be hit or miss: you get better traction out of the corner but may get understeer or little bit of loose rear end.
Understeer will be when you have low power and soft supension, so it is not recommended in those circumstances
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 997
Location: Washington DC area

PostPosted: Mon Dec 04, 2017 3:35 am    Post subject: Reply with quote

I've welded the dif on each (Audi and snailshell boxes) of my 924 race cars as well all of my other race cars over the years. It takes some getting used to with low speed understeer but the high speed oversteer is best for racing.
I've also raced with LSDs and Torsen difs but like the welded the best. No additional heat generated vs the clutch types and no jerkiness like the Torsen.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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daniel  



Joined: 18 Jun 2009
Posts: 612
Location: Sydney, Australia

PostPosted: Mon Dec 04, 2017 9:23 am    Post subject: Reply with quote

I have my diff welded on my 924 race car with Getrag gearbox. Big improvement in the dry - slightly backwards in the wet.
Don't try to push onto the trailer!
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
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kevingross  



Joined: 15 Apr 2015
Posts: 22
Location: Stow, MA, USA

PostPosted: Thu Dec 14, 2017 2:49 pm    Post subject: Reply with quote

Not a great idea for street use - the differential was after all invented for a reason. For a track, it will depend, generally useful for large ovals with wide, open corners.

The big negative is that if you have a failure on one side of the diff, such as a broken half-shaft, the car will snap turn you into whatever is next to you faster than you can react. Dangerous.
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daniel  



Joined: 18 Jun 2009
Posts: 612
Location: Sydney, Australia

PostPosted: Fri Dec 15, 2017 10:13 am    Post subject: Reply with quote

Equally dangerous both ways. I had a CV joint go on me mid corner whilst still running the open diff and the sudden power cut sent me sideways. I only just managed to avoid riding my self and car out on a concrete wall
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Over the top of skyline, total brake failure.... hit the wall at over 200 kp/h at the dipper, so anyone who has to brake for the esses is a pussy.
1977.5 Race Car, CAMS Group S Spec
1989 944 Cabriolet
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