The problem with the Raven is the rear motor is still prone to overheating and the cooling system is not significantly different from my 2018 P100D. I can overheat that system in two consecutive 1/4 mile passes. This is simply not going to cut it over a 20km course running flat out. the Model 3 front motor in the Raven may continue to work but the major component of the overall output will be exhausted within a few miles.
To top it off, the brakes on the Model S are the same as, I believe, the 2015 Camaro, which is about a thousand pounds lighter. It's all fine and dandy on your average road but it will not take more than 2-3 hard braking zones before the brakes become ineffective and dangerous. Sure, the regen system can kick in and assist but that will significantly add to the already critical overheating problem in the drivetrain.
What we are seeing is real promise in the prototype Roadster drivetrain. This speaks directly to the capabilities we should expect out of the Roadster 2020.