I did not want to hijack the other CVT tread, but it seems that some people do not understand how a CVT works. The first CVT in a car application was designed by the Dutch company Daf in the mid 50's it was an ingenious design (for small cars) and quite simple. With twin drive belts, there was not only redundancy (in case a belt should break) but also the need for a differential was negated as each drive axle could work independently and a a different speed to it's partner. It can be seen in operation here: https://www.youtube.com/watch?v=FFndpKhbPlA But it did have some strange quirks. Gear ratios were determined partially by engine vacuum. A large throttle opening = reduced amount of manifold vacuum, would cause the drive pulleys to force the drive bands into a Lower gear. This meant that maximum speed would NOT be obtained at maximum throttle. Backing off on the throttle (slightly) at speed would allow the car to go faster. The car could also go just about as fast Backwards as going Forwards. This made the Daf ONE OF THE FASTEST CARS IN THE WORLD! Going backwards.