Does anyone know of a good shop, or Porsche dealer) in the St. Louis area (or as far away as Indianapolis or Columbia, MO) who has done Quaife TBD installations on a Cayman. If so, what would you guess as the hours it requires. What are typical installation costs?
TBD - Torque Biasing Differential
With an ordinary open differential, a lot of precious power is wasted during wheel spin under acceleration. This happens because the open differential shifts power to the wheel with less grip, along the path of least resistance. The torque capacity of the TBD/ATB unit is increased or decreased by varying the helix and pressure angles of the gear teeth. The operation is automatic and the unit is a direct replacement with the stock differential. There are no clutch plates as in more conventional limited-slip designs.
The Torque Biasing Differential or A.T.B., however, does just the opposite. It senses which wheel has better grip, and biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel. In drag-race style, straight-line acceleration runs, this results in a close to ideal 50/50 power split to both drive wheels, resulting in essentially twice the grip of an ordinary differential.
To see the installation of a TBD style unit Click Here
Parktown Porsche is a Quaife distributor and has installed a Quaife TBD in a CS. Call Dan Schultz (service mgr) 314-965-7711
TBD - Torque Biasing Differential
With an ordinary open differential, a lot of precious power is wasted during wheel spin under acceleration. This happens because the open differential shifts power to the wheel with less grip, along the path of least resistance. The torque capacity of the TBD/ATB unit is increased or decreased by varying the helix and pressure angles of the gear teeth. The operation is automatic and the unit is a direct replacement with the stock differential. There are no clutch plates as in more conventional limited-slip designs.
The Torque Biasing Differential or A.T.B., however, does just the opposite. It senses which wheel has better grip, and biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel. In drag-race style, straight-line acceleration runs, this results in a close to ideal 50/50 power split to both drive wheels, resulting in essentially twice the grip of an ordinary differential.
To see the installation of a TBD style unit Click Here
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