Turbocharger
The first successful turbocharged racing engine appears to have been in 1952. Fred Agabashian in a diesel-powered Cummins Special qualified for the pole position at the Indianapolis 500. He led for . Then the turbo was damaged by tire debris. Offenhauser's turbocharged engines first came to Indianapolis in 1966. Their first victory came in 1968 using a Garrett AiResearch turbocharger. Turbocharged cars dominated the 24 Hours of Le Mans between 1976 and 1988, and then from 2000-2007.