Turbocharged petrol engines
Most turbocharged petrol engines use a single turbocharger, however twin-turbo configurations are also often used.
In motor racing, turbochargers were used in various forms of motorsport in the 1970s and 1980s. Since the mid-2010s, turbocharging has returned to several motor racing categories, such as Formula One and the World Rally Championship.
Several motorcycles in the late 1970s and early 1980s were produced with turbocharged engines.
- 1962: The first turbocharged production car engine was the Oldsmobile Turbo Jetfire used in the Oldsmobile Jetfire (a modified version of the turbocharger setup was also used in the Chevrolet Corvair Monza Spyder released a month later). A Garrett AiResearch turbocharger with integral wastegate was used. Power was significantly increased over the naturally aspirated (non-turbo) engine, however reliability of these engines was poor and the production of the engine ceased in 1963.
- 1965: Beginning this year a turbocharged version of the "Comanche" 154 cubic inch inline slant four cylinder engine was an option in the International Harvester Scout. This engine developed 83 kW (111 hp) at 4,000 rpm and 225 N⋅m (166 lb⋅ft) at 3,200 rpm and was available until 1967.
- 1973: The next mass-produced turbocharged car was the BMW 2002 Turbo, introduced at the 1973 Frankfurt motor show and featuring a 2.0 L (120 cu in) four-cylinder engine. Due to excessive turbo lag, safety concerns and the 1973/1974 oil crisis, the 2002 Turbo was discontinued in 1974.
- 1974: At the height of the oil crisis, the Porsche 911 Turbo was introduced, becoming the fastest mass-produced car at the time. The Porsche 911 has been available with a turbocharged engine for the majority of the years since 1974.
- 1977: The Saab 99 model begins Saab's long run of turbocharged passenger cars.
- 1978: The "LD5" version of the Buick V6 engine marks the return of turbocharging to cars produced in the United States.
- 1978-present: Many manufacturers have produced turbocharged cars. Since the early-2010s, many European cars have switched to smaller, turbocharged engines. This trend has since spread to manufacturers from other regions.
A common arrangement for twin-turbo engines, especially on V engines is a parallel configuration. This arrangement uses two identically sized turbos, each fed by a separate set of exhaust streams from the engine. Having two smaller turbos produce the same aggregate amount of boost as a larger single turbo allows them to reach their optimal rpm, more quickly, thus improving boost delivery.
Another twin-turbo arrangement commonly used on car engines is a sequential configuration, where one turbo is active across the entire rev range of the engine and the other activates at higher rpm. Below this rpm, both exhaust and air inlet of the secondary turbo are closed. Being individually smaller they have reduced lag and having the second turbo operating at a higher rpm range allows it to get to full rotational speed before it is required. Such combinations are referred to as a sequential twin-turbo. Sequential twin-turbo systems are usually more complicated than parallel twin-turbo systems because they require additional wastegate pipes and valves to control the direction of the exhaust gases.
Automobile manufacturers rarely use more than two turbochargers. Some exceptions are the triple-turbocharger system used by the 2012-2017 BMW N57S straight-six diesel engine, the quad-turbocharger system used by the V12 engine in the 1991-1995 Bugatti EB110 and the quad-turbocharger system used by the W16 engine in the 2005-2015 Bugatti Veyron and 2016-present Bugatti Chiron.
Indy car racing
One of the first uses of turbocharging in motorsport was a turbocharged version of the Offenhauser V8 engine, which first competed at the Indianapolis 500 in 1966 and used a Garrett AiResearch turbocharger. This engine won the Indianapolis 500 in 1968 and power outputs of over 750 kW (1,000 hp) were achieved in 1973.
Sports car racing
In Formula One, the original "Turbo Era" lasted from the 1977 season until the 1988 season. During this era, Renault, Honda, BMW, and Ferrari produced engines with a capacity of 1,500 cc (92 cu in) able to generate 750 to 1,120 kW (1,000 to 1,500 hp). The first turbocharged Formula One car was the Renault RS01, however early engines often suffered from reliability problems. By the mid-1980s, turbocharged engines dominated Formula One, until they were banned after the 1988 season
Turbocharging returned to Formula One for the 2014 season, with turbocharged 1.6 L (98 cu in) V6 engines replacing the naturally aspirated 2.4 L (146 cu in) V8 engines that were previously used. The turbocharging combined with more powerful energy recovery systems kept the power level similar to the previous V8 engines, despite the smaller capacity and the lower rev limits.
Touring car racing
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.
Since the 2019 season, turbocharging has returned to DTM, with turbocharged 2.0 L (122 cu in) inline-four engines (shared with the Japanese Super GT "Class One" regulations) replacing the previous naturally aspirated 4.0 L (244 cu in) V8 engines.
Turbocharging returned for the 2012 season and has been used since. 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.
- 1978 Kawasaki Z1R-TC
- 1982 Honda CX 500 Turbo
- 1982-1983 Yamaha XJ 650 Seca Turbo
- 1983 Honda CX 650 Turbo
- 1983 Suzuki XN85 Turbo
- 1983-1985 Kawasaki GPZ750 Turbo
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- Smith, Robert (January 2013), "1978 Kawasaki Z1R-TC: Turbo Power", Motorcycle Classics
- Motorrad 2014. sfn error: no target: CITEREFMotorrad2014 (help)
- Walker 2006, "other manufacturers built prototypes and small batches of turbocharged machines, only the Japanese giants attempted to exploit the turbo for series-production bikes". sfn error: no target: CITEREFWalker2006 (help)
- Bennett 1999, p. 57a "Neither system [superchargers nor turbochargers] has found acceptance in the mass-produced motorcycle market, although a significant effort to build turbos was made by the Japanese motorcycle makers in the early 1980s. Factory turbos were shipped by Honda (the 82-horsepower CX500T V-twin), Yamaha (the 85-horsepower XJ650T transverse-four), Suzuki (the 85-horsepower XN85, using a GS650 transverse-four) and Kawasaki (the 110-horsepower ZX750 transverse-four)." sfn error: no target: CITEREFBennett1999 (help)
- Smith, Robert (January–February 2013). "1978 Kawasaki Z1R-TC: Turbo Power". Motorcycle Classics. 8 (3). Retrieved 2013-02-07.