Nissan NPT-90 (IMSA)

The Nissan NPT-90 was a racing car developed in 1990 for Nissan Motors by Nissan Performance Technology Incorporated (NPTI), formerly known as Electramotive Engineering. It was a replacement for the highly successful GTP ZX-Turbo that had won the IMSA GT Championship in 1989. The NPT-90 would go on to win the championship in 1990 and 1992 before being retired by Nissan at the end of the 1992 season.

Although officially known as the NPT-90, the car continued to race with the GTP ZX-Turbo naming painted on it. This was an attempt by Nissan to continue to use that name to market for the Nissan 300ZX road car.

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Audi 90 Quattro IMSA-GTO

Tras sus éxitos en los rallys, Audi domina en pista a finales de los años 80 con la tracción quattro. Hurley Haywood asegura el título en el ferozmente competitivo Campeonato TransAm de Estados Unidos con el Audi quattro 200 en 1988.

Audi ganó un total de ocho carreras. Un año después en Estados Unidos, Hans-Joachim Stuck celebra siete victorias IMSA-GTO con el Audi 90 quattro.

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IMSA GTP (80's)

In 1981, purpose-built prototypes appeared in a new category, known as GTP, similar to the new Group C introduced in the World Endurance Championship the following year, the main difference between the two categories was the former had no emphasis on fuel consumption which was highlighted by Derek Bell quoting "race fans do not come to races to watch an economy run!" (referenced from Prototypes: The History of the Imsa GTP Series).

Brian Redman was the first champion of the GTPs, driving a Lola T600. March also fielded prototypes, in which Al Holbert won the 1983 championship, and Randy Lanier a year later. 1984 also saw the introduction of the Porsche 962, which dominated the series from 1985 to 1987. Nissan then took control of the series in 1988, but faced challenges from Jaguar, Porsche, and Toyota throughout the proceeding three years. Toyota was quickest in 1992 and 1993, this being the end of GTP era.

There were many other manufacturers in the GTP class, such as URD, Spice, Intrepid or Gebhardt, and in the early 1990s, Mazda. Along with the GTP cars, the Camel Lights lightweight, low horsepower prototype category was introduced in 1985. Argo were the first Lights champions, followed by Spice. Well known were also Tiga, Royale, Alba, Fabcar, and Kudzu.

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