Heritage: The 300ZX that beat Daytona, conquered Le Mans and forced IMSA to change the rules
In 1994, Nissan had a particularly successful year in American sports-car racing.
The company's 300ZX competition program won the 24 Hours of Daytona, the 12 Hours of Sebring and its class at the 24 Hours of Le Mans.
It also secured the IMSA GTS Drivers' and Manufacturers' Championships.
That would have been a remarkable season for almost any manufacturer.
For Steve Millen and Clayton Cunningham Racing, it was something more.
It was the culmination of several years developing a racing car that shared the identity of Nissan's Z32 300ZX but had evolved into an entirely different sort of machine.
It was also a comeback story.
From production sports car to endurance racer
The Z32 300ZX arrived in 1989 as a dramatic departure from the previous Z31.
The road car introduced a wider, lower body, sophisticated suspension and a 3.0-liter VG-series V6 offered in naturally aspirated and twin-turbocharged configurations.
Nissan's racing program took the recognizable 300ZX silhouette and built something considerably more aggressive underneath.
Clayton Cunningham Racing developed the IMSA GTS machine around a chromoly steel tube-frame structure with purpose-built bodywork.
According to Nissan's published specifications, the competition car used a 2,960 cc twin-turbocharged VG30DETT, producing more than 800 horsepower.
A five-speed Nissan transmission incorporating Hewland gears handled the output.
Those figures refer to the specialized competition engine, not a production 300ZX Twin Turbo.
And even by racing standards, this was a substantial amount of power to manage.
The unfinished business of 1993
Steve Millen had already established himself as one of Nissan's most successful American racing drivers.
But his 1993 season was interrupted by a serious crash at Watkins Glen.
Millen suffered extensive injuries and faced a difficult recovery.
Blake Z. Rong's detailed 2014 Autoweek retrospective describes how the driver returned to testing only months after the accident, determined to resume competition.
By the beginning of 1994, Millen was ready.
The 300ZX program was ready, too.
Its development had reached the point where the team could concentrate on race strategy and reliability rather than simply surviving the mechanical demands of endurance competition.
The results were immediate.
Two 300ZXs, two different Daytona stories
There is an important detail that gets lost whenever the 1994 season is summarized.
The car that won Daytona was not the same chassis that subsequently won Sebring and Le Mans.
Millen qualified the No. 75 Nissan on pole at the 24 Hours of Daytona.
But approximately nine hours into the race, the car suffered a crankshaft failure and retired.
The sister No. 76 remained competitive.
When rain arrived, the team put Millen into that car, where he joined Scott Pruett, Butch Leitzinger and Paul Gentilozzi in the winning effort.
The No. 76 ultimately won the race by 24 laps, according to Autoweek's account.
For Millen, recovering from serious injuries only months earlier, it was an extraordinary return.
And the season had barely begun.
Sebring and Le Mans belonged to No. 75
The No. 75 recovered from its Daytona disappointment to win the 12 Hours of Sebring.
Then the team took its ambitions overseas.
At the 1994 24 Hours of Le Mans, Millen joined Johnny O'Connell and John Morton in Nissan's effort to add a European endurance victory to its American success.
The event was far from straightforward.
Autoweek's account describes mechanical problems that required rapid gearbox and camshaft repairs during the race.
The No. 76 was eliminated after a fire.
But the No. 75 survived.
It finished fifth overall and first in its IMSA GTS class.
That distinction matters.
Nissan did not win Le Mans outright in 1994. The overall victory belonged to the Dauer 962 LM.
But for a production-based GT racing program, finishing fifth overall against dedicated endurance prototypes was an enormous achievement.
The same Z that had been developed to fight in American sports-car racing had proved itself on one of the world's most demanding circuits.
The rules eventually caught up
Nissan and Millen finished the season as IMSA GTS champions.
The twin-turbocharged 300ZX had become an extraordinarily effective competition package.
Effective enough that it faced a major regulatory problem.
IMSA's 1995 regulations eliminated the turbocharged engine configuration the team had spent years developing.
Nissan responded by replacing the VG30DETT with a V8 derived from the Infiniti Q45's VH engine family.
The 300ZX continued racing, but the character of the program changed dramatically.
Millen's professional driving career also ended following another serious accident at Road Atlanta in 1995.
The extraordinary 1994 campaign became the defining achievement of the twin-turbocharged Cunningham 300ZX.
A championship car survives
The Le Mans-winning No. 75, chassis No. 7, eventually became part of Millen's personal collection.
In 2014, Nissan and Millen brought the car back to the track for the Rolex Monterey Motorsports Reunion at Laguna Seca.
Members of the original crew participated in the reunion effort, reconnecting the machine with people who had helped make its most successful season possible.
The car's continued existence is important because it represents an era of GT racing that now feels remarkably distant.
A manufacturer-supported sports car with more than 800 horsepower.
A tube-frame chassis wearing familiar production styling.
A team capable of replacing major engine components during a 24-hour race and sending the car back into competition.
And a championship season that carried Nissan from Daytona to Sebring to Le Mans.
The modern Z is still a serious sports car.
But the 1994 300ZX reminds us just how extreme Nissan's interpretation of that identity once became.
Sometimes the most interesting Z isn't the one sitting in the showroom.
It's the one that made the rulemakers nervous.
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