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   ocr: Although the compression ratio must be reduced somewnat in order to keep the total compression ratio (supercharger plus piston/ cylinder) below the Knock limit, the etticiency only sutters if the turbocharger is designed for excess boost pressure in order to improve pertormance at lower engine speeds, as is done in racing cars. In this application, a waste gate or pressure reliet vaive is incorporated in order to limit boost pressure as full engine speeds are reached.