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The classic CVT design never got to grips with powerful engines with lots of torque. Quite some manufacturers offer some sort of CVT in their production series but mostly in the sub-200/250Nm torque range, so basically on small size cars. Audi did some belt-R&D themselves and are currently offering a reinforced CVT in IIRC the A6 which can handle up to 300Nm. I don't really know what kind of CVT they used in the Williams F1 car but that engine will not have exceeded 350Nm I guess.
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