Mezue ahịrịokwu na-esonụ: N'afọ 1984, a gbanwere chassis mbụ iji nweta Hart 415T engine ma ghọọ "101B", na sidepods ọhụrụ. Ka oge na-aga, e wuru chassis ọhụrụ ka mma ma bido na
1984 San Marino Grand Prix, ebe nke mbụ ka emesịrị gbanwee dị ka "101C" iji were Ford Cosworth DFV (ụdị nke atọ nke injin na ọnwa ole na ole), na afọ gara aga n'akụkụ pods, na mgbe Detroit rụzigharịrị na Hart engines iji mee ihe dị ka T-Car.