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Turbochargers are commonly used in passenger cars to obtain greater power output from a given engine size. The compact nature of a turbocharger means it is often a more space-efficient solution for increasing power output than increasing engine displacement. As an example, the turbo Porsche 944's acceleration performance was very similar to that of the larger-engine naturally aspirated Porsche 928. Although turbocharging is less responsive than supercharging, turbocharging is generally considered more efficient than supercharging. New techniques such as twin-turbo/biturbo (whether parallel or sequential) setups and twin-scroll turbocharger, in combination with technologies such as variable valve timing and direct fuel injection, have cut down on turbo lag. ==History== *1962: General Motors manufactured the first turbocharged production cars with the Turbo Jetfireengine 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.〔(【引用サイトリンク】title=Honeywell Heritage: A Hallmark Throughout Turbo History " Booster Online )〕 Power was significantly increased over the naturally aspirated (non-turbo) engine, however reliability of these engines was poor and the production of the engine stopped in 1963〔 *1973: The next mass-produced turbocharged car was BMW's 2002 Turbo, introduced at the 1973 Frankfurt motor show and featuring a 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, Porsche introduced the 911 Turbo, which was 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: Saab released the Saab 99 model with a turbocharged engine. *1978: Turbocharging returned to American-produced engines, in the form of the Buick Regal V6. Since 1978, many manufacturers have produced turbocharged cars. Notably in the mid-2000s, BMW which long used small-displacement high-rev naturally aspirated engines, re-introduced its turbocharged gasoline engine, the BMW N54. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Turbocharged petrol engines」の詳細全文を読む スポンサード リンク
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