The Porsche 961 was the racing version of the 959 supercar. While the 959 rallye car was also internally called 961, publicly only the circuit racer was called 961. Only one 961 was built. It had 959 prototype chassis number which in turn was from the 1985 911 Turbo chassis number sequence: WP0ZZZ93ZFS010016. The 961 was entered at the 1986 Le Mans 24 hour race. Uncommonly, the 24 hour race was scheduled for May 31-June 1 that year, two weeks earlier of the typical Le Mans weekend in the middle of June.