If you were aiming for 300mph then what would need to change and would it be possible. There is less heat so less drag which must be a huge advantage.
What kWh battery pack would be needed?
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Maximum speed in a straight line is largely determined by the vehicles maximum power output compared to its drag although once you get past about 200 mph dynamic stability can start to become a serious issue as well.
The current Land speed Record is held by Thrust SSC which was powered by two jet engines, reached supersonic speeds and has as much in common with a plane as a conventional car.
A crucial point is that aerodynamic drag is proportional to the square of speed so all else being equal to double the maximum speed you need to quadruple the thrust/torque available and 8x the power.
In any car, even a high performance one there is a trade off between maximum speed and handling and even very high end performance car manufacturers have pretty much given up chasing headline top speed as if becomes a bit meaningless once you get cars which can top 200mph and acceleration, braking and handling become more meaningful measures of performance. Even current F1 cars don't get anywhere near 300 mph simply because adding aerodynamic down-force increased overall average speeds around a track at the expense of increased drag.
I suppose it is possible that you could use the electric drive train from a Tesla to attempt to get to 300mph but it would for all practical purposed be a completely different vehicle as you would need totally different chassis, body shape and gear ratios.
As a point of reference the current Land Speed Record for an electric car is 341 mph. As you can see from the article this is a very different vehicle from a Tesla.