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"It's a funny thing about a porsche... There's the moment you know you want one...
There's the moment you first own one... And for the truly afflicted there's a decade or two that passes in between." 02 911 Turbo Stage 4
The GTS came standard with an electronically controlled version of an LSD system called the PSD. Not sure what it stands for but i would assume proportional slip differential or something like that. IIRC it supposedly will adjust the lock up from 0-100% as needed.
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1994 Cobalt blue/black 964 turbo 3.6
1993 Amazon green/cashmere 928GTS 5 speed
1993 Amazon green/cashmere 964 C2
2004 Cayenne Turbo
Many others now gone.PCA member since 1983 affiliate since 1977
PSD (Porsche spier (sp?) differential) was included on US 928's starting with the 1990MY. Prior to that, 928's were available with optional clutch-type limited-slip (LSD) units. Look for option code 220 on the build sheet or on top of the gas tank. Sometimes there is a sticker still attached to the diff cover announcing the LSD presence.
The PSD system includes a pump and reservoir for hydraulic (brake) fluid in the left rear wheelhouse area. There's a controller linked to the ABS sensors that detects wheel slip under acceleration. When activated, the PSD pump pressurizes a hydraulic cylinder that increase the preload on the clutch pack in the diff until slip is eliminated. Because the allowable slip is determined dynamically, it's great for street use but not necessarily great for track use. Many track users remove the heavy pump and the rest of the hydraulics, and replace the slave cylinder on the diff with a simple steel cover plate with an adjusting bolt. Clutch pack preload is therefore adjustable, just not while driving.
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Bob Fuelleman
'89 928S4 Auto, Black with Cashmere interior
Glendale, Ca. (Los Angeles area)
My 1986.5 has LSD as a factory option...BTW my car is for sale if anyone interested. Will post in classifieds soon. Blk Blk 86.5 5 speed w/68K original miles, mint and lightly updated. 86.5's have the bigger brakes of the later 928's.
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