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In the fields of the internal combustion engines for automobile and marine use, higher output power, higher efficiency and lower fuel consumption are strongly expected. The problems of environment such as a global greenhouse effect or an acid rain is getting worse. Therefore the exhaust gas regulations had been introduced and being strengthen in the USA, Europe and Japan. These regulations demand the reduction of NOx and particulate matter(PM) from diesel exhaust gas at the same time. The turbocharging has been more important technique for these regulations. For automobile engines, it is common to use the pulse turbocharging system for compactness and advantage of response. The characteristics of compressor and turbine are different from under steady state condition by pulsating flow. Especially, it is difficult to estimate the performance of turbine mounted on engine by using the map measured under steady state flow.