It was at the 1984 British Grand Prix at Brands Hatch that Duckworth and Ford finally agreed to build a turbo powered engine to replace the DFV. Initially an old Straight-4 sportscar engine was tested, but it proved to be very unreliable and unable to produce the necessary power required to be competitive in Formula One. Duckworth had wanted to use the 4 cyl engine as he believed it to be more compact and had better fuel economy than a V6 engine, though project manager Mike Baldwin had been against that idea from the start. After four of the 4 cyl engines had been destroyed during a 4-month development period, and finding that with a turbo increasing power the engine had formed an incurable vibration at the crankshaft, eventually it was decided that an all-new V6 engine would be built, developed and tested throughout 1985. The new , 120° Ford-Cosworth TEC V6 turbo engine (internally dubbed the GBA), made its debut at the 1986 San Marino Grand Prix in the Team Haas (USA) Ltd entered Lola THL2, the car driven by World Champion Alan Jones. Its development was rushed, and while the engine proved somewhat reliable, it was well down on power compared to the other turbo charged engines used in such as the Honda, BMW, Renault and TAG-Porsche engines, which were reportedly producing in excess of . As a result, neither Haas Lola drivers Jones or Patrick Tambay were able to exploit the good Lola chassis due to the underpowered engine, scoring only 8 points for the season, with a best finish of 4th for Jones at the Austrian Grand Prix (Tambay finished the race in 5th, the race also seeing the first points scored for the new engine).