1983 Formula One World Championship  The 1983 FIA Formula One World Championship was the 37th season of FIA Formula One motor racing. It featured the 1983 Formula One World Championship for Drivers and the 1983 Formula One World Championship for Constructors, which were contested concurrently over a fifteen-race series that commenced on 13 March and ended on 15 October. Nelson Piquet won the Drivers' Championship, his second Formula One title and the first to be won by a driver using a turbocharged engine, while Ferrari won the Constructors' Championship. The Drivers' Championship developed into a four-way battle between Brabham-BMW driver Piquet, Renault driver Alain Prost and Ferrari duo René Arnoux and Patrick Tambay. Prost led the championship from the Belgian Grand Prix in May until the final race in South Africa in October, where a turbo problem forced him to retire and thus enabled Piquet to snatch the title. Ferrari won the Constructors' Championship despite its better driver, Arnoux, finishing only third overall – a unique feat in Formula One history. The season also included a single non-championship Formula One race, the Race of Champions, which was held at Brands Hatch and won by defending World Champion Keke Rosberg in a Williams-Ford. This was to be the last non-championship race in Formula One history. A major change in technical regulations mandated a flat undertray for the cars, with a complete ban on the ground effect technology pioneered by the Lotus 78 in . This was done to reduce downforce and cornering speeds, which were deemed to have reached dangerous levels in , a season in which several violent and fatal accidents occurred. The following drivers and constructors contested the 1983 FIA Formula One World Championship. Williams retained defending world champion Keke Rosberg, but their number two seat, which had been occupied on a temporary basis by both Mario Andretti and Derek Daly in after the departure of Carlos Reutemann, was filled for 1983 by Ligier's Jacques Laffite. During the season Frank Williams signed an exclusive deal to use the turbocharged Honda V6 engines in his cars to replace the Cosworth DFV. Honda engines first appeared in the back of a Williams at the season-ending South African Grand Prix. Ligier also lost Eddie Cheever to Renault. Team boss Guy Ligier replaced them with Jean-Pierre Jarier, signed from Osella, and Raul Boesel, formerly of March. Jarier would gain a reputation through the season as a "mobile chicane".