The motor must be modified to improve its cooling capacity, and AutoblogGreen reports that Tesla is ditching the air-cooled motor in favor of a liquid-cooled one. Road testing of DriveTrain 1.5 could begin as early as next week. Coincidentally, that's when the first production Tesla Roadster, dubbed P1, will be delivered to Elon Musk, the company's chairman. The company has cleared all the Environmental Protection Agency and Department of Transportation hurdles and says it will start building cars in England on March 17. Production will start slowly and ramp up through the summer once DriveTrain 1.5 is ready to go. Loads more pictures of the car we named Car of the Year can be found here.