|New Golf TDI BlueMotion. Click to enlarge.|
Volkswagen’s third-generation Golf TDI BlueMotion, introduced as a concept at the Mondial de l’Automobile in Paris last September(earlier post), is rated with fuel consumption of 3.2 l/100 km (73.5 mpg US) on the NEDC—equivalent to 85 g/km CO2. This represents a 15% improvement in fuel consumption compared to the previous model.
Volkswagen launched the first generation of the Golf BlueMotion in 2007.At that time, the Volkswagen set a new benchmark for sustainability with a fuel consumption value of 4.5 l/100 km (52.3 mpg US), or 119 g/km CO2. The second generation of the Golf BlueMotion—with fuel consumption of 3.8 l/100 km (61.9 mpg US), or 99 g/km CO2—made its debut in autumn 2009.
With numerous aerodynamic modifications, the Golf TDI BlueMotion achieves a Cd value of 0.27, contributing to its low fuel consumption. The aerodynamics of the TDI BlueMotion were enhanced, among other things, by a lowered chassis (by 15 mm), a special roof spoiler, a radiator grille that is almost closed to the outside (with integrated BlueMotion lettering), partially closed air inlet screens in the bumper, optimized cooling airflow and special underfloor panels.
Curb weight was reduced by 49 kg (108 lbs). The BlueMotion model also incorporates the features that are standard for all new Golf models: the Stop/Start system and battery regeneration mode; inner-engine modifications with the TDI; a wider spaced 6-speed manual gearbox; and tires with extremely low rolling resistance.
The new Golf TDI BlueMotion accelerates from 0-100 km/h in 10.5 seconds; in 4th gear, the Golf TDI BlueMotion accelerates in 9.0 seconds from 80 to 120 km/h (50 to 75 mph).
New TDI engine. The 1,598 cm3 turbo direct injection engine (TDI) is a four-valve four-cylinder engine of the new EA 288 range. It produces 81 kW (109 hp) in the engine speed range from 3,200 to 4,000 rpm. The TDI equipped with common rail injection develops a maximum torque of 250 N·m (184 lb-ft) starting at 1,500 rpm and running up to 3,000 rpm. As a result, the Golf TDI BlueMotion can be driven more frequently than on average with very low torques and thus in a very fuel-efficient operating range, VW suggests.
Construction details such as reduced internal friction (among other things, through piston rings with low pre-tension and the use of low-friction bearings on the camshaft); a novel thermal management system with shortened warm-up phase (e.g. separate cooling circulation loops for the cylinder head and the cylinder crankcase as well as a deactivatable water pump); exhaust gas recirculation (EGR), cylinder pressure sensor, two-stage oil pump and the water-cooled intercooler located in the intake lead to a further reduction of fuel consumption and emissions compared to the displaced engine.
For emissions control, Volkswagen also employs a NOx storage catalytic converter and a diesel particulate filter close to the engine.
Modified 6-speed gearbox. The engine’s power is transmitted to the wheels via a 6-speed gearbox. Volkswagen engineers tuned the gearbox especially for use in the new Golf TDI BlueMotion. Among other modifications, they integrated a 6th gear with a longer ratio for lowering the torque; moreover, the gearbox works with a new fuel-efficient oil featuring a low viscosity, which heightens its effectiveness.