In recent years, the application of Miller cycle and EGR to gasoline engines has advanced to improve thermal efficiency. Along with the application of these technologies, the use of variable capacity turbochargers (VG turbochargers) providing better supercharging is rapidly advancing mainly in Europe and China. Mitsubishi Heavy Industries Engine & Turbochargers Co., Ltd. (MHIET) developed the VG turbochargers with a totally-renewed compressor and turbine aerodynamic design, and achieved an overall turbocharger efficiency improvement of +1% at low speed and +9% at high speed compared with the existing product.
