the time. That changed on 23 November 1969, at the second running of the World Challenge Cup Fuji 200 Mile invitational race. For this race, the 474S was modified with the addition of a rear spoiler, which had been banned from use in the Japan Grand Prix. Minoru Kawai, driving the white and blue number 8 Toyota 474S, won the race ahead of John Cannon's Ford G7A, a milestone for the Toyota 7 project. Two other Toyota 474S were entered, however, Kukidome (#6) retired after 46 laps, and Hosoya (#7) retired after 35 laps. In addition, a modified McLaren M12 with the Toyota 79E engine was entered as a research and development car for Fushida, who retired after 21 laps. Twelve 474S chassis were constructed, and the only survivor is Kawai's Japan Can-Am winning car, which was restored in 2007. Turbocharged 7 (578A) The next evolution of the Toyota 7 was the turbocharged 578A. Development began in November 1969, and the first chassis was completed in April 1970. Like the 474S, the 578A was constructed with a space frame chassis - however, the frame was made using aluminium alloy instead of steel, and titanium and magnesium alloy was used for the gearbox casing, suspension arm, and driveshaft for increased rigidity and further weight saving. These weight-saving technique brought the car's minimum weight to 620 kg. The engine was bolted to the rear of the bulkhead, just behind the cockpit. Improved suspension geometry resulted in improved handling and stability. Powering the Toyota 7 Turbo was the new 91E engine. It was a 5-litre V8 engine like the previous 79E, but the addition of two Garrett AiResearch turbochargers brought the 91E to a conservatively-estimated @ 8,000 rpm, with peak torque of 725 Nm @ 7,600 rpm. The Toyota 7 Turbo was set to compete in the 1970 Japan Grand Prix Car Race at Fuji Speedway, against Nissan's prospective challenger, the R383. But on 8 June, Nissan announced that they would be withdrawing from the Japan Grand Prix, citing their desire to concentrate on developing more efficient road vehicles in the wake of the 1968 Air Pollution Control Law. Shortly thereafter, Toyota also announced they would withdraw from the Japan Grand Prix, and the Japan Automobile Federation (JAF) cancelled the 1970 running of the race. Toyota planned to move the cars to North America and enter the Can-Am Series. Three Toyota 7 Turbos