Audi has launched a new series of Audi A3 and Audi A4 cars with a new turbodiesel powerplant. The new 2.0 litre TDI powerplant makes 170ps, which is 30 extra horses over the previous 2.0 TDI engine which makes 140ps. This extra power is achieved through the use of pieze injector technology.

Piezo injection technology brings a number of benefits which allows the higher engine output. Piezo injectors applies an electric voltage to ceramic, altering it’s crystal structures. This makes the ceramic expand, and mechanically triggers the opening of the injection needle using hydraulics. This piezo electrical current can be varied, giving the engine management the ability to vary the number of injections per cycle at will. It is also in general 4 times faster than conventional solenoid valves. Moving masses are also reduced by more than 75 percent.

As a result, the new engine makes 170ps at 4,200rpm and 320Nm of torque from 1,750rpm to 2,500rpm. The 2.0 litre TDI turbodiesel engine without the piezo injector technology makes less horsepower, 140ps at 4,000rpm but the same amount of torque, 320Nm between 1,750rpm and 2,500rpm. The older 2.0 TDI 140ps version without the piezo injectors will still be offered.