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0 to 60 mph in 4 seconds!

Tesla's new powertrain can accelerate from 0 to 60 mph in "about four seconds."

The powertrain uses a single-speed transmission to achieve the original performance specifications of accelerating from 0 to 60 mph in "about four seconds."

"The work is done and completed, and we are now inserting the enhanced powertrain setup into our production process," said Darryl Siry, vice president of sales and marketing for Tesla.

In December, after a series of transmission-related delays, Tesla had said it would deliver the first batch of speedy sports cars with an interim transmission that would take about 5.7 seconds to get from 0 to 60 mph, instead of the previously promised 4ish seconds, but would replace those transmissions with a higher-torque version – free of charge – once the new transmissions were ready.

The next month, the company announced it had designed a new one-speed transmission system that would solve its problems, and earlier this month, Tesla said it would introduce the new transmission system when it enters full production by September (see Tesla Announces New Transmission and Tesla Production Slower Than Expected).

With the new gearbox and powertrain design, the Roadster's estimated range will increase 10 percent, enabling it to drive 244 miles on a single charge. Torque will increase 33 percent to 280 foot pounds, according to the company.

Final Powertrain Design

"Now that we have a final powertrain design, in a matter of months there will be hundreds of Tesla Roadsters across the country," CEO Ze'ev Drori said in a written statement. "We're heralding nothing less than a new era of the automobile."

Siry added that Tesla has now delivered Roadsters to 27 customers. The company last month said it had delivered "more than a dozen" of its sporty electric cars and had 15 equipped with everything but the battery and powertrain (see Tesla Delivers More Than a Dozen Roadsters).

More than 50 Roadsters have started on the production line, and now that the powertrain is ready, the company expects to ramp up to starting 10 new cars per week from four "starts" per week today. The company plans to reach 20 per week by December and reach its full capacity of about 40 cars per week by March.

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