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MHI has so far employed the radial straight blade compressor for its MET exhaust-gas turbochargers. However, the radial straight blade compressor, though excellent with the maximum efficiency of as high as ne = 85% as used for the Super MET and more advanced MET-SA machines, has its inherent drawback of the surging point and point of maximum efficiency coming very close to each other and hence the actual point of operation becoming located by approximately 3 % to 4 % lower than the point of maximum efficiency due to the need for allowing for a margin of safety against surging. By comparison, the backward curved blade compressor offers an advantage of being limited in the lessening of its efficiency from the maximum point even with a large margin of safety against surging and thus enables the actual point of operation to be raised accordingly. In view of the above, MHI recently devised for application to its turbochargers a high-performance backward curved blade compressor capable of offering the maximum pressure ratio of as high as piTOT = 4.0.