 Complete the following phrase:  Brabham began 1982 with three BT50s, one of which was the original BT50 built the previous year, for the season opening South African Grand Prix. It was hoped that the high altitude, as it had in the past for the turbo-powered cars run by the Renault team, would be beneficial for the BMW engines. This proved to be the case in qualifying, Piquet second on the grid alongside René Arnoux in the Renault, with Riccardo Patrese in the other BT50 two places back in fourth. However, in a disastrous race for the BT50, both drivers retired early in the race. Piquet bogged down at the start and was quickly swamped by the field. Running 13th at the end of the first lap, he spun off on lap 4. Patrese had at least run in fourth place for a time before he too retired, due to a turbo bearing failure. Feeling the engines were still not race ready, Ecclestone opted to field Cosworth-powered BT49 chassis at the Brazilian Grand Prix. Piquet won that race but was later disqualified for circumventing the minimum weight limit by running water-cooled brakes. Both drivers also raced the BT49 at the 