Differing from the WSC R90CKs, Nissan used its R90CPs for the All Japan Sports Prototype Championship. Japanese drivers Masahiro Hasemi, Toshio Suzuki, and Kazuyoshi Hoshino joined Swedish driver Anders Olofsson in the lineup. The cars debuted at the 500 km of Fuji and finished in second and fourth, behind Toyota's new 90C-V. Following the cancellation of the second round at Fuji, a third race was scheduled at the track, and Nissan was able to score its first win. Hasemi and Olofsson drove their car to a two lap victory over a Porsche 962C, while the second car finished off the podium. Hoshino and Suzuki then took the next race win at the 1000km Suzuka, followed by Hasemi and Olofsson taking their second victory at Sugo. The final race of the JSPC season, once again at Fuji, broke Nissan's three race streak, with Toyota taking victory by just over a minute. Nissan won the manufacturer's championship, with all four Nissan drivers tying for the drivers championship. 1991 For the 1991 season, Nissan upgraded its cars into the R91CPs, with some older cars sold off to privateers. Nova Engineering upgraded its R90C to R91CK specification utilizing the Yatabe (Japan Automobile Research Institute—JARI) wind tunnel, while Team Le Mans bought a R90CP and modified it into its own R91VP. Keeping the same driver line-up as the previous season, the factory Nissan team won the opening round at Fuji, while the Nova Engineering entry took second, and Team Le Mans fourth. At the second race at Fuji, Toyota debut its new 91C-V, but it could not fight the R91CPs. Nissan took the top two positions with its factory cars, a lap ahead of the new 91C-V. By the third race at Fuji, Toyota was able to improve its new car and take its first overall victory of the season, with Nissan finishing second place, ten seconds behind. The second team car was taken out in an accident. The 1000 km Suzuka saw further problems for the team as the Nova Engineering entry took second place ahead of the factory entry in third, several laps behind. Nova was ahead of Nissan again at the next round, but all cars managed to finish on the same lap as the winning Toyota. Nissan beat Toyota at the 1000 km Fuji, winning by a minute, though three of the Nissans were unable to finish. Jaguar won at the