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Delivering highly pressurized Ultra-Low Sulfur Diesel to all four piezoelectric injectors is Bosch's common rail system that runs at pressures up to 30,000 psi. Bosch's piezoelectric injectors are capable of delivering up to five pre- and post-injection pulses of fuel, helping to eliminate noisy diesel clatter and greatly improving efficiency and emissions.
Bosch also contributed the Jetta TDI's high-pressure fuel pump, engine ECU, diesel particulate filter (essential for reduced soot), low-pressure EGR sensors, camshaft sensors, oxygen sensors, hot film air mass sensor, and glow timing ECU.
The net result of all this technology is a stout wave of low-rpm torque, extremely low emissions, no soot, and gas-engine-quiet operation. Not to mention gas mileage as high as 58.85 mpg as recorded by mileage-busting couple John and Helen Taylor.--Colin Mathews