Audi's Secret Super Diesel Electric Turbo Prototype Is Fast As HellTravis Okulski9/25/12 2:00pmFiled to: Concept CarsAudiA6DieselAround the BlockTest DriveTop1362EditPromoteShare to KinjaToggle Conversation toolsGo to permalinkFor ages, Audi has continually tried to push diesel powered cars on an American market that, for many silly reasons, just isn't all that interested.AdvertisementAudi has a prototype of a car in Germany that could make Americans love diesels more than their own firstborn child. And I just drove it.(Full Disclosure: Audi wanted me to drive the A6 Elektischer Biturbo so bad that they flew me to Munich — no, not Munich, California, but the one in Germany — during Oktoberfest, put me up in an efficient economy hotel, and is sending me to Paris tomorrow for more car goodness.)AdvertisementWhile diesel has always made a boatload of low end torque, there is still some turbo lag at lower RPMs. But it seems like Audi has found a pretty great solution for that problem.The A6 Elektischer Biturbo has a 3.0 liter turbodiesel V6, which I was told is the same as the engine in the new SQ5. That means you get 306 horsepower and 479 pound feet of torque. That makes for a quick ride. But there is a noticeable area below 3,000 RPM where the engine just falls flat on its face.