Buuxi weedhan soo socota: Sannadkii 1984-kii, shaashadii ugu horreysay waxaa loo habeeyay in lagu rakibo mashiinka Hart 415T oo loo beddelay "101B", oo leh dhinac cusub. Kadib waxaa la dhisay chassis cusub oo si fiican loo dhisay waxaana lagu soo bandhigay
1984 San Marino Grand Prix, halka kii ugu horreeyay markii dambe loo beddelay "101C" si loo qaato Ford Cosworth DFV (nooca saddexaad ee mashiinka dhowr bilood gudahood), oo leh sanadihii hore ee dhinacyada, iyo ka dib markii Detroit dib loo hagaajiyay mashiinnada Hart si loogu isticmaalo T-Car.