Audi: A Super-Clean Super Car
When you say "super car," the first things that come to mind are usually either "speed" or "expensive." With the introduction of Audi's R8 TDI, that may change to "clean" and "fuel efficient."
The R8 TDI Concept houses a V12 Diesel power plant that is derived from the engine used in the R10 Racecar. The same engine that has twice run the 24-hour Le Mans. It is slightly longer than the traditional V8 used the R8, but much more potent. The Twin-Turbo V12 makes 500 horsepower and 737 ft/lbs of torque, which is available at 1750 RPM. All of this power is routed through a short-throw 6-speed transmission. A small diameter clutch is used to shorten shift times. Also included, as with most Audi's, is a Quattro all-wheel-drive system. This translates into a 4.2 second 0-62 mph time and a top speed of over 186 mph.
The real story is how cleanly this power is produced. The TDI's V12 burns clean enough to pass the strict California emissions standards. Strict being an understatement. This is thanks to a new system that requires up to 5 fuel injections for every cycle of the engine. This is paired with a 3-stage exhaust treatment which includes a small injection of a chemical called "AdBlue," which helps to break down nitric-oxide. The entire system is guaranteed to last the lifetime of the vehicle. As an added bonus, it produces around 24 miles per gallon on the highway, making it one of the most fuel-efficient super cars on the road.
"We are challenging the final piece of conventional wisdom [about diesel engine cars]," said Audi AG Chairman Rupert Stadler. And they couldn't have chosen a better platform to use. Audi is hoping the R8 TDI will show that a properly engineered diesel engine can maintain a high level of performance while still being good for the environment.
Source : MSN Auto