Development
Following the defeat of the Nissan R380-II at the 1967 running of the Japanese Grand Prix, Nissan set about developing an improved car for the 1968 event. Aware of the new CanAm series in North America that ran under the new Group 7 classification, the new R381 became a much more powerful and faster car in comparison to the previous model.
Knowing that the original Prince GR8 Straight-6 would not be powerful enough, Nissan planned to use a new Prince-built V12. However the engines was not completed in time (partially due to this being the first time Nissan or Prince had constructed a V12), so the company turned to a Chevrolet 5.5L V8 which produced nearly 450 hp, twice the amount of the Prince GR8. Also borrowing from CanAm, most notably Chaparral, large rear wings were placed on the new design. These dual wings placed side by side could be driven by hydraulics that moved either the left or right wing up or down in order to increase cornering ability.
For bodywork, the R381 was initially an evolution of the R380's coupe design. The rear tail was lengthened and the engine cover made flat in order to increase rear downforce in conjunction with the rear wing. The back of the car was also made flat, with a Kamm tail effect. However, upon becoming aware of the new Toyota 7 car which also ran in Group 7 rules, Nissan chose to cut the roof of the R381 off. A thin windshield was all that remained, while a tiny rollbar was placed on the engine cover.
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