Tesla Roadster 3.0 (400 miles range upgrade) now official



Tesla Motors made the previously reported Roadster 400 miles upgrade official on their blog. Here are the details about Roadster 3.0:
The Roadster 3.0 package applies what we've learned in Model S to Roadster. No new Model S battery pack or major range upgrade is expected in the near term. 
Battery technology has continued a steady improvement in recent years, as has our experience in optimizing total vehicle efficiency through Model S development. We have long been excited to apply our learning back to our first vehicle, and are thrilled to do just that with the prototype Roadster 3.0 package. It consists of three main improvement areas. 
1. BatteriesThe original Roadster battery was the very first lithium ion battery put into production in any vehicle. It was state of the art in 2008, but cell technology has improved substantially since then. We have identified a new cell that has 31% more energy than the original Roadster cell. Using this new cell we have created a battery pack that delivers roughly 70kWh in the same package as the original battery. 
2. AerodynamicsThe original Roadster had a drag coefficient (Cd) of 0.36. Using modern computational methods we expect to make a 15% improvement, dropping the total Cd down to 0.31 with a retrofit aero kit. 
3. Rolling ResistanceThe original Roadster tires have a rolling resistance coefficient (Crr) of 11.0 kg/ton. New tires that we will use on the Roadster 3.0 have a Crr of roughly 8.9 kg/ton, about a 20% improvement. We are also making improvements in the wheel bearings and residual brake drag that further reduce overall rolling resistance of the car. 
SummaryCombining all of these improvements we can achieve a predicted 40-50% improvement on range between the original Roadster and Roadster 3.0. There is a set of speeds and driving conditions where we can confidently drive the Roadster 3.0 over 400 miles. We will be demonstrating this in the real world during a non-stop drive from San Francisco to Los Angeles in the early weeks of 2015.
Appointments for upgrading Roadsters will be taken this spring once the new battery pack finishes safety validation. We are confident that this will not be the last update the Roadster will receive in the many years to come.

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