Forget the turbochargers; leave the normally aspirated cars at home. For this race, you couldn't even use petrol. To get from Darwin to Adelaide, across the sun-baked interior of Australia, the rules said you had to rely on whatever energy was freely available. The hippies from Hawaii expected wind as well as sun, while the most sophisticated car had an armadillo's coat of gallium arsenide. The competition was fierce but friendly, the journey full of unexpected trials and tribulations. But everyone enjoyed racing with the sun.