The new engine is the world’s first application of a twincharged FSI powerplant and it also holds the title of delivering the highest output per liter for a production four-cylinder engine. Peak output stands at 168hp (125kW) with maximum torque of 240Nm (177lb-ft) plateauing from a lowly 1,750rpm to 4,500rpm. Remember, this is a 1.4L petrol powered engine but with the low torque characteristics and fuel efficiency of a diesel.
The key to its prowess is the combination of a mechanically driven supercharger for the lower revs with an exhaust driven turbocharger kicking in as revs start to rise. To boost output further, engineers also added a revised version of VW’s FSI direct-injection technology. The end result is the power characteristics of a 2.3L engine but with 20% lower fuel consumption.
read more at:The crankshaft driven supercharger kicks in immediately, delivering boost pressure of 1.8bar just above idle and providing plenty of shove off the line. Depending on how much power is required, an electromagnetic clutch integrated with the coolant pump decides when to switch from the supercharger to the turbo. This happens somewhere around the 3,500rpm mark, and reverses if engine speeds drops back to the lower regions. Not surprisingly, there’s a constant 200Nm (148lb-ft) of torque available from 1,250rpm that’s still hanging around at 6,000 revs.
