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Torque Converter Operation at High Speed

WARNING: This page does not describe the selected car, but rather 212 other vehicles, including the 2012 BMW 750i, 2012 BMW 750Li, 2011 BMW M3, 2011 BMW 750i, and 2011 BMW 750Li. However, it is still accessible from the selected car via links, so may be relevant.
  1. As engine speed increases, the turbine speed approaches the speed of the impeller.
  2. The fluid flow is directed from the turbine to the back side of the impeller blades.
  3. The one-way clutch in the stator unlocks and the stator blades turn in the direction of engine rotation.
  4. Fluid is no longer re-directed and torque multiplication no longer takes place.
  5. This is referred to as "Coupling Speed". The turbine never reaches the same speed as the impeller as fluid flow would come to a halt. Ratio is approximately 1.1 to 1. See Fig 1.
    Fig 1: Torque Converter Operation At High Speed
    G00317021Courtesy of BMW OF NORTH AMERICA, INC.
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