Volkswagen Jetta. The Best Engine Choice For You
Technically speaking, petrol direct injection, engine charging and reduced displacement are some of the most efficient ways to significantly reduce fuel consumption while significantly improving a vehicle’s dynamic properties. That is why Volkswagen is taking exactly this approach in its TSI engines: Reducing engine displacement, which in turn lowers friction and charge changing losses, resulting in lower specific fuel consumption and better engine efficiency. Engine charging takes the form of either a combination of turbocharger and supercharger or a specially developed turbocharger.
1.4 TSI with 160 PS: This twincharged engine, i.e. both turbocharged and supercharged, with 160 PS (at 5,800 rpm) is exceptionally economical (combined fuel consumption is estimated from 6.3 l/100 km).
Especially interesting is the complementary interaction of supercharger and turbocharger. The supercharger, mechanically driven by a belt, increases the TSI’s torque at low engine speeds. This is a charging unit based on the Roots Principle. A special aspect of this supercharger is its internal gearing, which enables high supercharger performance even at low engine speeds.
At higher engine speeds, the exhaust gas-driven turbocharger (with wastegate control) kicks in. Then the supercharger and turbocharger work in series. The supercharger is operated via a solenoid clutch that is integrated in a module within the water pump. A control gate ensures that the flow of fresh air required for the operating point reaches the turbocharger or supercharger. In pure turbocharger mode the control gate is open. Then the air takes the familiar path of conventional turbocharged engines via the front intercooler and throttle valve and into the induction pipe. Starting at an engine speed of 3,500 rpm the supercharger turns all of the work over to the turbocharger.
Test drive the VW Jetta yourself to discover this entertaining yet frugal engine.
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