The Ralt RT1 is a race car chassis produced by Ralt, and was the first modern car produced by the company. It saw widespread use in a number of different motorsports categories, mostly open-wheel racing, but later including sports car racing. It was powered by a number of different four-cylinder engines of about 1.6 L (98 cu in) in displacement, of different origin, including Hart, Cosworth, Toyota, and Volkswagen engines.