Turbocharged petrol engine

[15] This arrangement uses two identically sized turbos, each fed by a separate set of exhaust streams from the engine.

Being individually smaller they have reduced lag[16] and having the second turbo operating at a higher rpm range allows it to get to full rotational speed before it is required.

The first turbocharged Formula One car was the Renault RS01,[20] however early engines often suffered from reliability problems.

[21] In the German Deutsche Tourenwagen Meisterschaft (DTM) racing series, the "Turbo Era" of 1985 until 1989 saw Volvo, Alfa Romeo and Ford becoming the first manufacturers to use turbocharged engines.

In 1985, the Volvo 240 Turbo won the European Touring Car Championship, before turbochargers were banned at the start of 1990 season due to cost reasons.

During the Group B era of 1982–1986, turbocharged engines producing up to 450 kW (600 hp) dominated the World Rally Championship.

WRC rally cars use a turbocharged 1.6 L (98 cu in) inline-four engine with a 34 mm restrictor in the air intake system.