- The Washington Times - Friday, November 28, 2008

BROADVIEW, Ill. (PRNewswire)| Modern diesels are cleaner than ever before. To show how efficient they are, the latest generation made its debut recently on the racetrack proving that even in full race driving conditions diesel vehicles can remain clean and green … and highly fuel- efficient.

Thirty new VW Jetta Diesel TDIs, powered by 2.0-liter, four-cylinder engines that produce 170 horsepower and 258 lb.-ft. of torque, tackled some of the top road racing courses in North America during the Volkswagen Jetta Diesel TDI Cup, a multi-race series of basically stock Jetta ‘clean diesels’ racing at major road tracks from Lime Rock to Road Atlanta.

“What we have here are virtually stock diesel passenger cars that raced hard throughout the summer and fall, averaging fuel mileage in the mid- twenties and running absolutely clean under very tough full road race conditions,” said Wolfgang Hustedt, Motorsports Manager for Bosch.

The heart of these clean, highly efficient engines is a Bosch common-rail fuel injection system that uses fast, precise Bosch piezoelectric fuel injectors, instead of a traditional mechanical system. Diesel fuel is pressurized along a “common rail” for delivery to electronically activated injectors for each cylinder.

“This is the stock setup for the VW Jetta Diesel TDI - basically the same engine and car any motorist would get if he picks one up and takes it home - with the addition of racing ABS brakes and suspension,” Hustedt said. “This advanced diesel technology allows the vehicle to become the first automobile to meet the world’s most stringent emission control standards - California’s Tier II, Bin 5,” he added.

The latest common rail system relies on highly precise rapidly switching piezo injectors, which have 75 percent fewer moving components and mass, allowing them to switch at double the speed of previous solenoid-valve injectors.

“The Jetta TDI diesels operating with this system are very powerful with lots of torque in addition to high fuel efficiency and very low emissions - and they are very quiet,” Hustedt said.

“In older diesel engines, the fuel management system was almost entirely mechanical,” Hustedt said.

To help make it ‘green,’ in addition to the sophisticated Bosch fuel system components, the Jetta also uses a Noxstorage catalyst, which is basically a reservoir that temporarily holds the noxious emissions like a particulate filter, until they can be burned off during one of the engine cycles.



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