TSI.

It is Volkswagen’s declared aim to cut CO₂ emissions and fuel consumption substantially. This should not, however, be accomplished at the expense of driving safety and driving pleasure. New solutions and innovative engine technology are needed to achieve this objective.

One of the most effective engine-based measures for cutting fuel consumption is “downsizing” the engine. A reduction in the displacement to 1,390 cc cuts friction losses and thus achieves a higher level of engine efficiency. This does, however, conflict with modern-day expectations of an ample torque pattern, because the latter provides greater active driving safety and driving pleasure. The solution is supercharging.

A solo turbocharger does not operate efficiently enough in the lower speed range to achieve the desired performance values. Although a mechanical supercharger is very effective at low engine speeds, fuel consumption suffers at higher engine speeds due to the elevated power consumption. The solution is to combine both supercharging systems productively, resulting in the twincharger of the 1.4 TSI. As a result of complex interplay, the compressor and exhaust turbocharger increase the boost pressure to as much as 2.5 bar (at 1,500 rpm) even from very low engine speeds.

The Volkswagen petrol direct injection technique provides an ideal basis for economical fuel consumption and high efficiency. The result is the world's first direct-injection petrol engine with twin supercharging: the 1.4 TSI from Volkswagen.