Toleman scored their best F1 results with the Hart turbo-powered TG184. Ayrton Senna finished second in the 1984 Monaco Grand Prix and was catching leader Alain Prost when the race was red-flagged in heavy rain.
He finished on the podium again at Brands Hatch and Estoril – the former coming after team mate Johnny Cecotto was badly injured in a crash during practice. Stefan Johansson took his place at the team.