 In the early 1980s, teams like Renault, Ferrari and Brabham were using 1.5-litre turbocharged engines in favour of the 3.0-litre naturally aspirated engines that had been standard since 1966.Having seen in 1982 the need for a turbo engine of their own, Dennis had convinced Williams backer Techniques d'Avant Garde (TAG) to fund Porsche-built, TAG-branded turbo engines made to Barnard's specifications; TAG's founder Mansour Ojjeh would later become a McLaren shareholder.In the meantime, they continued with Cosworth engines as old rival Lauda came out of retirement in 1982 to drive alongside Watson in that year's 1B development of the MP4.