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Limited Slip

Need to purchase a limit slip unit to install in my 4-speed as part of my transmission rebuild. Car is predominantly used on the track.

Can any of you guys provide any recommendations? I understand that there are a couple of different brands, types and ratios but am not clear on which is the most preferred.

Thanks
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 01-11-2008, 05:33 AM
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I installed a Guard Transmission 50/80 LSD in my 930 before the 07 season. After running their Torque biasing diff on the track for many years the difference was very noticeable. Going from open to 80% lockup under heavy braking settled down the rear end big time.
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82 930, 2500lbs 430hp, Black | 85 944 Pro44 / ITS / PCA4 racer, Black
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Old 01-11-2008, 03:29 PM
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What is the principal difference (functionally) between the 50/80 LSD and Torque biasing?
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 01-11-2008, 04:56 PM
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Guard Transmission's web site explains this much better then I can.

http://www.guardtransmission.com/lsd_info.htm
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Lyall
82 930, 2500lbs 430hp, Black | 85 944 Pro44 / ITS / PCA4 racer, Black
87 Carrera, stock, GP White
03 Boxster S, GP White
73 De Tomaso Pantera, Grabber Blue
Old 01-11-2008, 09:59 PM
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Good suggestion... their website is very informative. I think I am going to go with a 50/80 LSD as you have based on my readings there as well as the linked discussion to vilocity magazine.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 01-12-2008, 09:43 AM
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Unfortunately I read the article after I installed their TB diff, which is a great diff, but not up to the task of heavy track work.

But while I'm in there...... I sold my TB to an autocrosser which is where these diffs rule.
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Lyall
82 930, 2500lbs 430hp, Black | 85 944 Pro44 / ITS / PCA4 racer, Black
87 Carrera, stock, GP White
03 Boxster S, GP White
73 De Tomaso Pantera, Grabber Blue
Old 01-12-2008, 10:00 AM
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I am still waiting on a response from GT... but if you don';t mind me asking... about how much was the LSD unit.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 01-12-2008, 10:22 AM
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You may also want to consider these.
http://www.racecar.co.uk/gripper/
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 01-12-2008, 03:13 PM
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Checked with GT... they are out of stock of LSDs for the next month (most likely). Anyone know of any alternative sources? Quaife seems to only make the torque biasing type.
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Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 01-14-2008, 12:17 PM
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Finding a used factory LSD is probably the only other option if you can't wait.
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Lyall
82 930, 2500lbs 430hp, Black | 85 944 Pro44 / ITS / PCA4 racer, Black
87 Carrera, stock, GP White
03 Boxster S, GP White
73 De Tomaso Pantera, Grabber Blue
Old 01-14-2008, 12:31 PM
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The Gripper are better than the stock LSD's. The preloading is better suited for performance on dry roads.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 01-14-2008, 12:44 PM
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Quote:
Originally Posted by 930LDR View Post
Checked with GT... they are out of stock of LSDs for the next month (most likely). Anyone know of any alternative sources? Quaife seems to only make the torque biasing type.
Try Carbonetic, they have a nifty lsd, more cheaper than the gt stuff.
Old 01-18-2008, 07:49 PM
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915 and 930 LSD's are interchangable, I believe. Neil Bainbridge said he removed the LSD from every 930 tranny he could lay his hands on for years, as most of the 930's came with an LSD.

Tuthill's in the UK have 915 Grippers on the shelf ready to go. If you can wait the extra time, go for the GT unit - they're more flexible.

I've got the 40/65 Gripper and I like it a lot, the tail is planted on deceleration. 80% lockup is pretty anti-social for street, I was told.
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'77 S with '78 930 power and a few other things.
Old 01-19-2008, 03:34 PM
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