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Raize
Joined: 18 Sep 2013 Posts: 186 Location: Scotland
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Posted: Sun Dec 03, 2017 9:56 am Post subject: Welded differential |
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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: 2309 Location: Somerset, UK
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Posted: Sun Dec 03, 2017 8:56 pm Post subject: |
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It’s been done on drift 944’s. Handling will be very sideways _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252 |
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Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
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Posted: Mon Dec 04, 2017 1:57 am Post subject: |
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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 _________________ '83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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Fifty50Plus
Joined: 28 Feb 2008 Posts: 1361 Location: Washington DC area
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Posted: Mon Dec 04, 2017 2:35 am Post subject: |
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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. _________________ 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: 670 Location: Sydney, Australia
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Posted: Mon Dec 04, 2017 8:23 am Post subject: |
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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! _________________ 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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kevingross
Joined: 15 Apr 2015 Posts: 34 Location: Stow, MA, USA
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Posted: Thu Dec 14, 2017 1:49 pm Post subject: |
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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. _________________ Kevin
Catellus Engineering, Inc.
http://www.catellusengineering.com/
catelluseng@gmail.com |
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daniel
Joined: 18 Jun 2009 Posts: 670 Location: Sydney, Australia
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Posted: Fri Dec 15, 2017 9:13 am Post subject: |
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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 _________________ 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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