The unique feature of TSI twincharger technology, which Volkswagen is the only manufacturer in the world to offer, is the combination of petrol direct injection and a twin supercharger. The two components of the "twincharger" – a supercharger and a turbocharger – work in ways that perfectly complement each other. From idle speed up to an engine speed of approx. 2,400 rpm, the supercharger operates continuously whenever there is a suitable power demand from the driver. Within the speed range of about 2,400 to 3,500 rpm, the supercharger is engaged as required, for instance for overtaking. The boost pressure is increased further by the in-line exhaust turbocharger. From 3,500 rpm upwards, only the turbocharger boosts the charge pressure in the cylinder. Each stage of the twincharger is thus always operated in its optimum range. The twincharger gives the TSI engine a flat torque curve right from idling speed and across a broad speed range, as well as outstanding maximum power combined with very low fuel consumption. For engines with a lower power rating, Volkswagen uses the TSI turbocharger technology. Like the TSI twincharger, this system delivers a superb high torque at low engine revs with extremely good fuel economy. As with the TDI engines before, Volkswagen has again succeeded in combining driving pleasure and economy with its TSI technology.

The recipe for the success of Volkswagen’s TSI engines is to be found in “downsizing”. Maximum power is obtained with minimum fuel consumption from a smaller engine. The reduction in engine size has brought better efficiency, as there is less power loss resulting from friction. The smaller engines also have the advantage of being lighter from the outset. So the engine has less weight to shift in the vehicle. Volkswagen’s TSI engines take full advantage of these effects.

Pioneering technology is used in the TSI engines, combining direct petrol injection with a turbocharger or charge compression with a turbo and a supercharger, enabling them to deliver impressive performance figures and torque and to provide the driver with the full spectrum of driving pleasure despite the smaller engine. The combustion of the petrol is particularly efficient, with the result that the power output of the TSI engines is considerably higher than is the case with conventional, naturally aspirated engines.