The turbo era really began to flower in 1983, when Piquet won his second World Championship by two points this time using a turbocharged BMW powerplant and McLaren introduced the TAG-Porsche engine, driven to four checkered flags by runner-up Prost. (Lotus as well brought out a turbo Renault, piloted by 4th-year driver Nigel Mansell to his first podium finish at Brands Hatch.) In the 1984 season, with a new MP4/2 car designed by John Barnard, McLaren and the TAG turbo won 12 of 16 races and took the constructors' championship with record points.