The DAF Variomatic introduced on the Dutch car maker's DAF 600 in 1958 was a continuously variable transmission (CVT) system which employed engine speed, via centrifugal weights, to shift the transmission and was enhanced by an engine manifold vacuum. It was the only car ever produced which went faster by the simple expedient of gently and gradually releasing the accelerator once top speed had been reached. This increased manifold vacuum which helped the variable pulleys shift to an even higher ratio so even though the engine RPM stayed the same, the transmission increased the car's speed, in the case of the DAF 600, from 60 mph (97 km/h) to nearly 70 mph (110 km/h) given enough time and level road.
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