The Nissan R90C was either of two Group C racing cars built in 1990 for Nissan Motors for competition in World Sportscar Championship (WSC) based in Europe and the All Japan Sports Prototype Championship (JSPC). The cars based on the basic R90C platform would compete until 1993 before Nissan chose to withdraw from sports car racing, not returning until 1997. It won three JSPC championships as well as several significant endurance races during its career.
Development
Mechanically, the R90Cs shared much with their predecessor, the R89C. Most of the chassis construction was the same, as well as the mechanical layout. The Nissan VRH35Z 3.5 litre twin-turbo V8 that had debuted in the R89C was proven successful and kept as part of the R90C's design. Although mechanically similar, the cars were nearly all new constructions, leading to chassis builder Lola Cars International terming the cars T90/10 , while the R89Cs had been T89/10 .
Unlike the R89C, Nissan felt that the car was a compromise. At the time, Nissan competed with the R89Cs in both the World Sportscar Championship and All Japan Sports Prototype Championships. The types of courses used by each series differed in style, with the European tracks requiring higher top speed and endurance while the Japanese events were run on small, tighter courses and shorter racers.
This led Nissan to actually develop two different cars. Although Lola built the basic chassis, Nissan Motorsports Europe would construct the rest of the R90CK in their shops with the intentions of creating a low downforce, high speed variant for the WSC. At the same time, R90CP would be built at Nismo's headquarters in Japan in a higher downforce layout that was better suited to the JSPC. This gave each of the two cars a unique design that is noticeably different.
R90CK
The R90CK would appear as an evolution of the R89C's design, borrowing many stylistic elements which had been used before. The front end of the car was low, with two deep channels on either side of a slanted nose leading to radiator inlets on the sides of the cockpit. Small slated inlets would also be placed on the leading edge of the car, partially feeding brake cooling ducts. The cockpit would feature a longer raked windshield then the R89C, yet the areas around the cockpit would remain nearly identical, including the sides of the car. At the rear, the rear wing would be mounted high on exposed struts for better downforce.
R90CP
The R90CP (P for the home of Nismo) on the other hand appeared to favor a low downforce design. The front of the car would feature a higher nose, with the narrow channels eliminated and replaced with large ducts on the inside of the fender. The fenders themselves were also redesigned, with headlights placed vertically instead of the horizontal design on the R89C and R90CK. The cockpit of the R90CK was identical to its R90CP sibling, yet the sides of the bodywork would be changed. Most notably, the rear-view mirrors were integrated into the bodywork on the fender, instead of small exposed mirrors on the side of the windshield. The rear fender would also be different in that the turbo inlet would be placed on the front edge of the fender, instead of on top of the engine cover on the R90CK. For the rear wing, it would be placed much lower on the car, with the rear wheel fender bodywork extending to connect with the rear wing endplates, similar to a style used on the Nissan GTP ZX-Turbo in North America.
Later versions
For 1991, Nissan officially withdrew from the World Sportscar Championship. However Nismo planned to continue competition in the All Japan Sports Prototype Championship, and decided to upgrade the R90CPs to better compete with Toyota and Mazda. The new cars, known as R91CP , would have slight modifications over the previous car. Most notably, the boxy turbo inlets which had been placed on the rear fenders of the R90CP were made into smaller slits, while a large snorkel was added to the top of the engine cover to better feed the engine. The cars would be further modified for 1992 with an upgraded VRH35Z twin-turbo V8, while the cars were renamed R92CP .
For the R90CKs, Nissan ran them mostly at the 24 Hours of Daytona following their retirement from the World Sportscar Championship at the end of 1990. For the 1992 running of Daytona, the R90CKs would have their VRH35Z engines replaced with smaller 3.0L twin-turbo V8s, although they would not be as successful as the race winning R91CP.
Three other unique R90Cs were cars that were based on existing cars but modified. One R89C was upgraded to become an R90CP, originally used by Nissan in the JSPC before all cars were completed. Nova Engineering purchased chassis #07 from Lola and initiated their own upgrades to the chassis, calling the car a R91CK. The final modified car was an R90CP bought by Team Le Mans and modified into what they termed the R91VP . Both cars featured minor aerodynamic differences from the other R90CKs and R90CPs.
Racing history
World Sportscar Championship
See also: 1990 World Sportscar Championship seasonAlthough the opening round of the 1990 World Sportscar Championship season was held at Suzuka Circuit in Japan, the new R90CKs intended for the series would not be completed in time for the event, leaving the previous Nissan R89Cs to be run by the European team. A lone JSPC R90CP was run by the Japanese team but did not finish. By the second round of the season at Monza, the first three R90CK chassis would be completed with Brits Kenny Acheson, Julian Bailey, and Mark Blundell joining Italian Gianfranco Brancatelli as the driving line-up. Although both cars ran well, one would not have enough fuel to reach the end of the race. The second team car would however manage to finish, taking seventh place.
Both cars ran towards the top of the field once more at Silverstone before a suspension failure and fuel problems eliminated both cars in the final few laps. The team would finally see some success at Circuit de Spa-Francorchamps though, with both cars finishing and the Acheson and Bailey car taking third place, two minutes behind the winning Mercedes-Benz. The driver line-ups were switched for Dijon, but the new Bailey and Blundell duo once again took a podium.
Although the Nissans would not podium at the Nürburgring, the team managed to bring home both cars in the top ten for the first time. As the season went on, the team continued to improve, with Donington Park seeing both cars finish in the top six, with Acheson and Brancatelli finishing fourth. This success was however aided by the post-race disqualification of both Jaguars that had finished ahead of the Nissans.
At the fly-away round at Montreal, the R90CKs would manage to take their best finish so far that season. The race had to be stopped early due to dangerous conditions, but at the time the Nissan of Bailey and Blundell were running only six seconds behind the leading Mercedes-Benz, earning the team second place when the red flag was shown; the second car took fifth. The good results for the team would continue into the final round of the season at Mexico City with Bailey and Blundell taking second place once again, although this time two laps behind the winning Mercedes-Benz. Acheson and Brancatelli managed fourth place. In the teams championship, Nissan would take third place, a mere four points behind Jaguar. Julian Bailey would be the highest ranking Nissan driver in the driver's championship, finishing the season in ninth place.
Following the 1990 season, Nissan chose to leave the World Sportscar Championship and concentrate on the JSPC and their efforts in the IMSA GT Championship in North America. Nissans would only compete one other time before the World Sportscar Championship was abandoned after 1992, with Nova Engineering's R91CK running in an invitational class at the 1992 1000km of Suzuka, finishing in fourth place.
All Japan Sports Prototype Championship
1990
Differing from the WSC R90CKs, Nissan would use their R90CPs for the All Japan Sports Prototype Championship. Japanese drivers Masahiro Hasemi, Toshio Suzuki, and Kazuyoshi Hoshino would join Swede Anders Olofsson as the factory drivers. The cars debuted at the 500 km of Fuji and were immediately on pace, taking the second and fourth spots behind Toyota's also new 90C-V.
Following the cancellation of the second round at Fuji, a third race was later held, and Nissan was able to score their 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, would however break the Nissan's three race streak, with Toyota taking victory by just over a minute. The three race wins would be enough in the end to allow Nissan to win the manufacturer's championship, with all four Nissan drivers tying for the drivers championship.
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