He joined Renault in 1984 after Alain Prost left them at the end of 1983. Warwick, expecting to have a race-winning car, led the Brazilian Grand Prix, his first drive for them, only to retire because of a suspension failure caused by an early race wheel banging duel with the McLaren of Niki Lauda. He finished in second place in both the Belgian and British Grands Prix in and placed seventh in the championship. 1984 would prove to be the beginning of the end for the factory Renault team, the pioneers of turbocharging in Formula One. Neither Warwick nor new teammate Patrick Tambay won a race in 1984, the first time since that the team did not win a Grand Prix.