A variable geometry turbine comprising: a turbine wheel; a variable geometry assembly that comprises a rotatable control ring that comprises a slot and a plurality of vanes wherein each vane comprises a post pivotably controlled by rotation of the control ring and wherein adjacent vanes define nozzles to direct exhaust gas to the turbine wheel; a crankshaft that comprises a pin for receipt by the slot of the control ring wherein rotation of the crankshaft rotates the control ring; and a center housing characterized in that the center housing comprises a rotatable stop fixed to the crankshaft and having a close stop surface and an open stop surface, a secured component and a translatable shaft wherein the translatable shaft comprises an engagement mechanism to engage the rotatable stop; wherein translation of the translatable shaft causes rotation of the crankshaft wherein the close stop surface establishes a contact with the secure component to limit rotation of the crankshaft and to establish a closed limit for the vanes, wherein the open stop surface establishes a contact with the secured component to limit rotation of the crankshaft and to establish an open limit for the vanes, wherein an angle Θ exists about the rotational axis between the close stop surface and the open stop surface upon establishment of their respective contacts with the secured component, and wherein adjustment of the secured component alters the angle Θ. a turbine wheel; a variable geometry assembly that comprises a rotatable control ring that comprises a slot and a plurality of vanes wherein each vane comprises a post pivotably controlled by rotation of the control ring and wherein adjacent vanes define nozzles to direct exhaust gas to the turbine wheel; a crankshaft that comprises a pin for receipt by the slot of the control ring wherein rotation of the crankshaft rotates the control ring; and a center housing characterized in that the center housing comprises a rotatable stop fixed to the crankshaft and having a close stop surface and an open stop surface, a secured component and a translatable shaft wherein the translatable shaft comprises an engagement mechanism to engage the rotatable stop; wherein translation of the translatable shaft causes rotation of the crankshaft wherein the close stop surface establishes a contact with the secure component to limit rotation of the crankshaft and to establish a closed limit for the vanes, wherein the open stop surface establishes a contact with the secured component to limit rotation of the crankshaft and to establish an open limit for the vanes, wherein an angle Θ exists about the rotational axis between the close stop surface and the open stop surface upon establishment of their respective contacts with the secured component, and wherein adjustment of the secured component alters the angle Θ. the center housing comprises a rotatable stop fixed to the crankshaft and having a close stop surface and an open stop surface, a secured component and a translatable shaft wherein the translatable shaft comprises an engagement mechanism to engage the rotatable stop; wherein translation of the translatable shaft causes rotation of the crankshaft wherein the close stop surface establishes a contact with the secure component to limit rotation of the crankshaft and to establish a closed limit for the vanes, wherein the open stop surface establishes a contact with the secured component to limit rotation of the crankshaft and to establish an open limit for the vanes, wherein an angle Θ exists about the rotational axis between the close stop surface and the open stop surface upon establishment of their respective contacts with the secured component, and wherein adjustment of the secured component alters the angle Θ.