This is the Derek Bell / Rolf Stommelen Porsche 935/78-81 JR-002. It was reported that on this day, April 24, 1983, the car suffered aerodynamic device (wing) failure at high speed, resulting in a crash in which Stommelen was killed.
The "JDAVID" sponsor was J. David "Jerry" Dominelli, who supported John FitzPatrick's team with proceeds from a sophisticated "Ponzi" scheme that deprived many families of their life savings. Dominelli spent quite a few years in prison.
Car looks nice on the track, though.
Riverside International Raceway, April 1983