To improve fuel economy in WLTP, Miller / Atkinson cycle, in which the expansion ratio in the exhaust process was larger than the compression ratio in the intake air process, becomes an essential technology for gasoline engines. In such fuel-efficient engines, the transient response of turbocharger is the key to success because the available energy in the exhaust gas becomes lower in spite of the high supercharging pressure requirement. IHI developed a new variable displacement turbocharger that can be applied to gasoline engines without using expensive nickel-base alloys, receiving a nomination of a series project.