 Complete the following phrase:  Brabham had been working with the German engine manufacturer BMW since 1980 on the development of a turbocharged engine for Formula One. The BMW-powered BT50 made its debut at the start of the 1982 season, taking advantage of the high-altitude Kyalami circuit in South Africa, which favoured turbocharged cars. However, the as yet unreliable BMW-powered cars were dropped for the next two races. Piquet finished first at the in a BT49D, but was disqualified after a protest from Renault and Ferrari on the grounds that the car had raced underweight due to its water-cooled brakes. FISA ruled that in future all cars must be weighed before coolants were topped up, resulting in a boycott of the fourth race of the season by most of the DFV-powered teams, including Brabham. Under threat from BMW, Brabham did not use its Ford-powered BT49s again until the sixth race of the season, the , where one was entered for Riccardo Patrese alongside Piquet in a BT50. Patrese won the race after a chaotic final lap on which several other cars stopped. Patrese used the BT49 for the next two races, taking a second place behind Piquets BMW-powered car in the BT49s final Formula One race, the 