Unperturbed, the Dome organisation created a second prototype, the P2, in the hope that the supercar would sell internationally. The improved P2 was built and exhibited at the Chicago Auto Show and Los Angeles Auto Expo in 1979 recieving glowing reviews from the American "Road & Track" magazine. Hayashi realised that a racing pedigree would enhance the appeal of the car and the Dome brand and decided to build a racing version to enter into the Le Mans 24 hours race in 1979. The result was the Dome Zero RL. The racer was built to Group 6 specifications with the 2.8 Nissan engine of the road car replaced by a 480 bhp Ford Cosworth DFV. The car was debuted in May 1979 at the Silverstone 6 hours race as a warm up for Le Mans. With the British driver pairing of Chris Craft and Gordon Spice, the Zero was quick from day one and it's speed was rewarded with third place on the grid. Various problems during the race saw the car come home 12th, 40 laps down, but the team were optimistic because the qualifying position and race finish had proven the potential speed and reliability of the Zero. At Le Mans in June, fuel feed problems forced retirement after only 6 hours but the team vowed to return the following year.
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