The Tyrrell Racing Organisation was an auto racing team and Formula One constructor founded by Ken Tyrrell which started racing in 1958 and started building its own cars in 1970. The team experienced its greatest success in the early 1970s, when it won three Drivers' Championships and one Constructors' Championship with Jackie Stewart. The team never reached such heights again, although it continued to win races through the 1970s and into the early 1980s, taking the final win for the Ford Cosworth DFV engine at Detroit in 1983. The team was bought by British American Tobacco in 1997 and completed its final season as Tyrrell in 1998.