Top speed P3D, ungoverned?

Top speed P3D, ungoverned?

I don’t remember seeing it mentioned here before. But has anyone heard any estimates on how fast top speed would be on the P3D (or on any of the lineup) without computer limitation?

jordanrichard | February 10, 2019

The limitation would be the tires. Every car on the road is governed and most of the time it is due to the tires. In Germany there is a “gentlemen’s agreement” that sedans will top out at 155 mph, regardless of the engine.

SeaP90D | February 11, 2019

For P versions I'm pretty sure the Michelins are speed rated Z which means tested in excess of 186mph so it wouldn't be the tires holding you back. The problem is that no one tells cars shaped like Teslas that they're a car not a wing, so they'd be just as happy to lift off at high speeds as stay on the road. So if you could figure out how to unlock it, you'd want an aero kit like you'd have on a 911 with a dam in front to limit air getting underneath and a wing in the rear to keep the back down if you want to try and kiss 200.

jordanrichard | February 11, 2019

The reason there are Z rated tires on the car has more to do with the weight of the car. My MS has W rated but my car is limited to 140 mph. Far below the rating for W rated tires. Due to as I said, the weight of the car and regen, this puts more stress on the tires. | February 11, 2019

Also keep in mind there is no multi-speed transmission. This means at 155 mph, you're running the motor at 18,000 rpm or so. My guess as you up the speed further the motor is likely to tear itself apart and/or fry the bearings. There are some limits too on the rotational design of the electric fields used to make the motor turn. I have no idea what those limits are, but at some point for a given motor design, it will not be possible to get more rpms.

Anyway, on any EV, there are an entirely different set of issues as you push the speeds higher without having it been designed for it. The Roadster 2020 appears to be designed for excess of 200 mph speeds, likely using a higher gear ratio to keep the max rpms within reason.

kerryglittle | February 11, 2019

Pedal to the metal. Or is that aluminum?

reed_lewis | February 12, 2019

@kerryglittle wrote: "Pedal to the metal. Or is that aluminum?" Aluminum is still a metal. Just not a ferrous metal of course. :)

And I wonder where anyone is going to drive their Tesla at those speeds anyways...

DonS | February 12, 2019

@TeslaTap +1
Car could have been designed with lower gear for more torque, or higher gear for higher top speed. Picking 155 mph as the top speed, engineers work backwards to choose a gear that will not cause the motor to fly apart. Granted, there is a safety factor, but choosing a larger safety factor results in a longer lifetime.