New Tesla Toadster is now slow with a 0-60 of 2.1s

Downforce without mass is not a thing. While it is true downforce does not increase the mass of the car, it does increase the apparent weight. Downforce and mass both produce forces that push the car down. From a physics perspective they are absolutely no different. A fat driver or a rocket thruster pointed up both create a larger normal force between the tires and the road. They both increase the apparent weight of the car.

The thrusters do have an advantage however because they can be shut off after the very first bit of the launch, thus removing the downforce (and apparent weight) of the car allowing it to accelerate faster. The fat driver on the other hand cannot shed their mass in an instant.

/r/cars Thread Parent Link - tflcar.com