As an avid SCCA Pro/Club racer, I’m getting very excited about the possibility of racing an electric racer! Right now, I currently race a car that was not ever thought of as being a car with "race potential" but it does very well and has logged over 110 race days! (and its still driven to the track) I don’t think that the tire compound really makes that much of a difference, as i get near 21mph to the track and near 4mpg on the track using DOT R compound tires year round.
The idea of using a Tesla roadster on the track, could become a reality if a few questions can be answered. If the Tesla and its 25kwh power plant was to be used on a race track, certainly its 200mile distance capability would be chopped to a small fraction. If you need all full power, its would be in the 15 mins range. However, in racing, you generally are at full throttle only about 50% of the time. so, as is, a 30 min session or race might be in its capabilities. As was mentioned, in paddock charging might be possible as it is not uncommon to have several hours between practice, qualifying and racing sessions. Time trial days, or DEs might be possible, but you might have to miss a session or two as those events focus on maximum track time.
In my mind, can the power plant exert full power or 50% duty cycle/ 10 seconds? (meaning full power for 10 seconds, off for 10 seconds). can the lithium batteries handle the high current discharge without losing too much voltage. (This has always been a challenge for this rechargeable battery type) . What happens to their capacity? I bet it wouldn’t be too much of a stretch to have the battery capacity cut in half for max discharge rates. I know the cells have a internal cut out circuit, but do they reset after time or can they be permanently damaged?
As a side note, safety would also be a concern. obviously, a 2300lb Tesla could be a potent racer, maybe as fast or faster than a lotis Exige. Also, it has already passed crash tests, but in extreme impacts, are the batteries a danger? Probably no more than all the leaky fuel cells I’ve seen go up in flames on impact on occasion.
Getting back to performance, if there was a way to get a second speed to spend more of the vehicle's time at or near its max power capabilities, 30-40% more performance might be had on the track. Since most of the time on the race track is spent between 70 and 110mph, a second gear to increase available HP might be something found in a race version.
These are exciting times. With VW and their TDI diesels showing a commitment to "green" racing, it would be a natural for one of the electric manufactures to REALLY show a green effort and one that isn’t a compromise of performance like Tesla would be able to produce.
mk