LSD Older vs Newer
03-02-2016, 04:13 PM
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LSD Older vs Newer
Looking at installing a LSD in my 87 auto as mine is a non LSD
Was wondering about the older LSDs like off a MY85 that only has 1 friction disk vs a newer LSD that has more than one friction disk?
Does the newer LSD provide more traction?
Was wondering about the older LSDs like off a MY85 that only has 1 friction disk vs a newer LSD that has more than one friction disk?
Does the newer LSD provide more traction?
03-02-2016, 04:23 PM
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You want the 78-84 which is more lock-up and can be made even tighter...BUT requires an adapter modification to fit the ring gear of the later cars. Carl at 928 Motorsports has additional information in his store..
03-02-2016, 05:42 PM
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My '86.5 auto came with LSD. It's sweet.
Over 150K miles and still rear steers around corners with the gas pedal. Great for doing bat turns (on wet streets).
78-82 '8-disk' small round holes in case
83-84 '8-disk' with the later ring gear spacing - the grail if you can find one
85-95 '4-disk' larger oblong holes in case
Note LSD units have weird non-Porsche part numbers. Make sure to check the specs.
Over 150K miles and still rear steers around corners with the gas pedal. Great for doing bat turns (on wet streets).
78-82 '8-disk' small round holes in case
83-84 '8-disk' with the later ring gear spacing - the grail if you can find one
85-95 '4-disk' larger oblong holes in case
Note LSD units have weird non-Porsche part numbers. Make sure to check the specs.
03-02-2016, 06:22 PM
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still easy to do bat turns with an open diff, but if you want to apply power in a straight line without one wheel spinning, you need a LSD.
you absolutely dont need the early diffs. they have more lock up, but he stock 87 is plenty for most all applications. For racing, its critical that you have the car set up right and fairly stiff, otherwise, you can get rear wheel lift and wheel spin. I have no issues, unless i break the front swaybar, then i have wheel spin coming out of high g loading , accelerating turns. most other situations, its not a problem, certainly on the street, there would be no issues.
in the snow, you would definitely want to convert to the 8 disc set up of the earlier LSD
you absolutely dont need the early diffs. they have more lock up, but he stock 87 is plenty for most all applications. For racing, its critical that you have the car set up right and fairly stiff, otherwise, you can get rear wheel lift and wheel spin. I have no issues, unless i break the front swaybar, then i have wheel spin coming out of high g loading , accelerating turns. most other situations, its not a problem, certainly on the street, there would be no issues.
in the snow, you would definitely want to convert to the 8 disc set up of the earlier LSD
Last edited by mark kibort; 03-02-2016 at 08:17 PM.
03-02-2016, 06:32 PM
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03-02-2016, 06:37 PM
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guess I got confussed reading about this from 928 Motorsports....
http://www.928motorsports.com/parts/...lip_plates.php
http://www.928motorsports.com/parts/...lip_plates.php
03-02-2016, 06:57 PM
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guess I got confussed reading about this from 928 Motorsports....
http://www.928motorsports.com/parts/...lip_plates.php
http://www.928motorsports.com/parts/...lip_plates.php
03-02-2016, 10:34 PM
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That is a late style, with 2 friction discs....one on each side.
It will fit in your 1987.
Ending torque should be 20-25 ft lbs. once rebuilt.
It will fit in your 1987.
Ending torque should be 20-25 ft lbs. once rebuilt.