Cosworth experimented with turbocharged BD derivatives, before settling on an all-new turbocharged V6 engine to be badged as the Ford TEC (internally it was known as the GB-series). This had a long development history dating back to the 1984 British Grand Prix at Brands Hatch where Cosworth and Ford's competition department agreed to build a new turbo engine to replace the outdated DFV / DFY series. The TEC raced only briefly, in , with the Haas Lola team and in with the Benetton team. The development of the GBA engine at Cosworth became the subject of a British TV documentary in Channel Four's "Equinox" series, broadcast in 1986.