Nissan NPT-90

Following five years of development and improvement on the GTP ZX-Turbo, Nissan realized that incoming competition from Toyota and Jaguar meant that a new car was needed to be able to continue to defend their championship.

NPTI, Nissan's North American motorsports division, was therefore tasked with construction of an all-new car, abandoning the original Lola-based GTP ZX-Turbo chassis.

The first chassis would be completed halfway through the season and debut at Topeka where it took an eighth-place finish, behind the second place GTP ZX-Turbo.

To open the 1991 season, Nissan returned to their practice of skipping the endurance 24 Hours of Daytona due to the more sprint-oriented design of the NPT-90.

However, as before, consistent points finishes during the season were able to overcome the problems that Jaguar and Toyota experienced in some events, allowing Nissan to take a third successive constructors championship.

Geoff Brabham would take his fourth drivers championship, beating teammate Chip Robinson by a mere five points.

The season's lowest point came at the Road Atlanta race, where tire failures led to a pair of massive crashes that destroyed two NPT-91 chassis.

Not deterred by the withdrawal of the factory effort, Gianpiero Moretti of the Momo company purchased an original specification NPT-90 for use in the full 1993 season.

The chassis was lightly modified to comply with IMSA's WSC regulations, so the roof was removed and a BMW V12 engine was fitted.

[3] The car started the race but didn't finish, retiring with an alternator failure after 86 laps, and was classified 67th overall and 13th in class.