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   ocr: Hithough the compression ratio must be reduced somewnat in order to keep the total compression ratio (supercharger plus piston/ cylinder) below the knock limit, the efficiency only sutters if the turbocharger is designed for eacess boost pressure in order to improve performance at lower engine speeds, as is done in racing cars. In this application, a vaste gate or pressure relief valve is incorporated in order tol limit boost pressure as full engine speeds are reached.