did the 928 come with an LSD ?

[STEVE KOJASEVIC]

was it an option, standard ? or NA

[Steve01tt]

LSD was an option on the 928. Not sure when it became available. I know for sure it was on the S4, GT, etc.

[GarnetRedCoupe]

I have all of the sales literature from 1978 to 1995, I’ll check it out to confirm, but I believe it was an option from the start.

[cobalt94T]

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.

[dr bob]

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.

[dan87951]

LSD is the only way to go on a 928

[Ispeed]

Not too much 928 activity over here.

[RG955TT]

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.