The invention relates to a starting unit comprising: an input, which can be coupled to a drive, and an output that can be coupled to a driven part; a starting element provided in the form of a hydrodynamic component, comprising at least one primary turbine wheel and one secondary turbine wheel that, together, form a working chamber which can be filled with operating material; an engaging and disengaging clutch comprising at least two clutch elements that can be brought into frictionally engaged active contact with one another in a direct or indirect manner via additional intermediate elements, the first clutch element being at least indirectly connected to the input in a rotationally fixed manner and the second clutch element being at least indirectly connected to the output in a rotational fixed manner; an adjusting device assigned thereto, and; a stationary or rotating housing that surrounds at least one of the turbine wheels while forming an adjoining chamber. The adjusting device of the engaging and disengaging clutch is situated in the adjacent chamber while forming a first operating material supply channel or space and can be subjected to the action of pressure prevailing therein. The operating material supply channel or space can be connected at least indirectly to an operating means supply source. The invention is characterized by the following features: means for influencing the transmission behavior of the hydrodynamic component, comprising at least one mechanical built-in part that acts at least indirectly upon the working circuit ensuing inside the working chamber; an adjusting device assigned to the mechanical built-in part, and means for subjecting the adjusting device to a differential pressure, which results from the pressure in the first operating means supply channel or space or in a channel or space coupled thereto or in the interior of the housing, and to a control pressure.