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New stringent diesel emission regulations have had the effect of limiting the acceleration rates of turbodiesel powered vehicles. A need for supercharging of turbodiesels has been well explained in the Ref. 1 SAE Paper by Mr. Thomas N. Schmitz et al workers of Mercedes Benz AG. The proposed engine air supply system submitted in this paper, utilizes two standard type radial flow compressors staged in series. The first compressor is a supercharger driven by a miniature, very high speed, high efficiency hydraulic turbine. Kapich Engineering has developed, and extensively tested, this high efficiency hydraulic turbine supercharger that incorporates a unique hydraulic system to power and control the supercharger. The second compressor is a standard turbocharger driven by the engine exhaust. The primary objective of the proposed system is to provide a dramatic increase of BMEP in the low engine speed range.