Renault had introduced turbocharged engines to Formula One in 1977. Brabham had tested a BMW four-cylinder M12 turbocharged engine in the summer of 1981. For the 1982 season the team designed a new car, the BT50, around the BMW engine which, like the Repco engine 16 years before, was based on a road car engine block, the BMW M10. Brabham continued to run the Cosworth-powered BT49D in the early part of the season while reliability and driveability issues with the BMW units were resolved. The relationship came close to ending, with the German manufacturer insisting that Brabham use their engine. The turbo car took its first win at the Canadian Grand Prix. In the Constructors' Championship, the team finished fifth, the drivers Riccardo Patrese, who scored the last win of the Brabham-Ford combination in the Monaco Grand Prix, 10th and World Champion Piquet a mere 11th in the Drivers' Championship. In the 1983 season, Piquet took the championship lead from Renault's Alain Prost at the last race of the year, the South African Grand Prix to become the first driver to win the Formula One Drivers' World Championship with a turbo-powered car. The team did not win the Constructors' Championship in either 1981 or 1983, despite Piquet's success. Riccardo Patrese was the only driver other than Piquet to win a race for Brabham in this period—the drivers in the second car contributed only a fraction of the team's points in each of these championship seasons. Patrese finished ninth in the Drivers' Championship with 13 points, dropping the team behind Ferrari and Renault to third in the Constructors' Championship.