Volkswagen has introduced a new cylinder deactivation technology for its 1.4 liter, 4-cylinder TSI power plant.

This announcement represents the first time a cylinder shutoff technology has been adapted to a 4-cylinder unit.

On the 1.4 liter TSI unit, 2 of the 4 cylinders are shut down when load is minimal or moderate on the engine. The deactivation can make for up to a 0.6 liter/100 km improvement in fuel-economy when coupled with a stop-start system.

Savings are even greater with certain drive modes. For example, at a constant speed of 50 km/h (28 mph) in 3rd or 4th gear, the deactivation technology can account for up to a 1.0 liter/100 km improvement in fuel-consumption.

The cylinder deactivation takes effect when the engine speed on the 1.4 TSI unit is between 1,400 and 4,000 rpm and torque load between 25 and 75 Nm (18 and 55 lb-ft).

The system works through sensors in the gas pedal which track the driving behavior. In a non-uniform pattern, such as in a roundabout, the system is suppressed so as to allow the driver access to full power if needed.