Details on the 959 S are scarce; Porsche made just 29 examples of it, with the 2.8-liter flat-six engine featuring larger turbochargers and the company claiming an “official” output of 508hp and 413 lb-ft of torque, over the standard 959’s 444hp and 369 lb-ft of torque. Top speed was “rated” at 210 mph.
Perfect traction was Porsche’s goal when they designed the 959. The PSK 4-wheel drive system was the technological highlight of the 959. PSK, which did add weight to the car, could vary the ratio of torque to the front & rear wheels. The default setting for the system was 40% front and 60% rear. Under acceleration the PSK adjusts to ratio to 80% torque to the rear wheels. During slippery conditions the ratio was 50 : 50.