In Tesla's day Tesla turbines held were marginally better than competing turbine designs in the application for commercial electrical production. Using them for other applications one must keep in mind Tesla turbines have a few fundamental flaws. They don't respond well to input variations as well as variations in load. As a load is applied to them their efficiency plummets rather quickly as the load increases. They also don't handle high temperatures well as the discs start to warp.
That said for a homemade low temperature steam turbine they may be the easiest solution. On a car they just won't be very efficient.
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