Making their debut in the Jetta at market launch are engines at two power levels: 77 kW / 105 PS (as diesel / TDI and petrol / TSI) and 103 kW / 140 PS (TDI). Of course, every Jetta engine complies with the EU-5 emissions standard. The TDI and TSI with 105 PS are also available with a BlueMotion Technology package. Its technical features include a Stop/Start system and recovery of kinetic energy by battery regeneration. The "small" TDI illustrates just how fuel efficient the BlueMotion Technology models are: The 4.6 metre long saloon with this engine consumes just 4.2 l/100 km – a top value, and not only in this class. The 140 PS TDI makes a fuel efficient appearance too: its combined fuel consumption is 4.8 l/100 km! Both TDI engines operate with common rail injection (which is quiet and efficient) and are equipped with a particulate filter. On the 105 PS TSI with BlueMotion Technology, fuel economy is a low 5.3 l/100 km – which is sensational for this market segment.
Over the course of the year, three more engines will follow for the Jetta. There will be three TSIs with 90 kW / 122 PS, 118 kW / 160 PS and 147 kW / 200 PS. With the exception of the 1.2 TSI, all other Jetta engines may be combined with an optional 6-speed DSG (77 kW TDI, 103 kW TDI, 147 kW TSI) or 7-speed DSG (90 kW TSI, 118 kW TSI).
Four petrol direct injection engines with 105 PS to 200 PS
Technically speaking, petrol direct injection, engine charging and reduced displacement are some of the most efficient ways to significantly reduce fuel consumption while improving a vehicle's dynamic performance. 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, results in lower specific fuel consumption and better engine efficiency. Engine charging in the Jetta takes the form of either a combination of turbocharger and supercharger or simply a turbocharger, depending on the power level.
1.2 TSI with 77 kW / 105 PS: This turbocharged 1.2 litre four cylinder engine is the newest TSI in the line-up; like all engines of this type, it too follows the TSI downsizing philosophy with its 1,197 cm3 displacement. And this means maximum power with minimal fuel consumption. This Jetta is offered with an optional BlueMotion Technology package. From standstill, the 77 kW / 105 PS Jetta 1.2 TSI accelerates to 100 km/h in 10.9 seconds, and its top speed is 190 km/h. This contrasts with benchmark-setting fuel consumption and emission values: 5.7 l/100 (134 g/km CO2) in the standard version, or 5.3 l/100 km, equivalent to 123 g/km CO2, in the BlueMotion Technology version. The 1.2 TSI reaches its maximum power at 5,000 rpm. Its maximum torque of 175 Newton metres is available between 1,500 and 4,100 rpm. The Jetta 1.2 TSI is combined with a 6-speed manual gearbox as standard equipment.
1.4 TSI with 90 kW / 122 PS: In the mid-range of engine power, the new saloon is powered by an efficiently operating 1.4 litre TSI with 90 kW / 122 PS (at 5,000 rpm). With a combined fuel consumption of 6.2 l/100 km (144 g/km CO2), the turbocharged engine makes the manually shifted Jetta one of the most fuel-efficient cars of its performance class. The 122 PS TSI takes the car to a top speed of 202 km/h. The saloon handles the classic 0-100 km/h sprint in 9.9 seconds. In the Jetta, the four cylinder engine reaches its maximum torque of 200 Newton metres between 1,500 and 4,000 rpm. This Jetta version may also be ordered with a 7-speed DSG gearbox.
1.4 TSI with 118 kW / 160 PS: This twincharged engine, i.e. both turbocharged and supercharged, with 118 kW / 160 PS (at 5,800 rpm) is exceptionally economical (combined fuel consumption with manual gearbox: 6.3 l/100 km), low emitting (147 g/km CO2) and torque strong (maximum of 240 Newton metres between 1,500 and 4,500 rpm). With this engine and a manual gearbox, the Jetta sprints to 100 km/h in 8.3 seconds; its top speed is 221 km/h. As an option, this engine may be ordered together with the 7-speed DSG.
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.
2.0 TSI with 147 kW / 200 PS: At the highest power level, the Jetta is driven by a 147 kW / 200 PS (at 6,000 rpm) TSI. This turbocharged 2.0 litre engine is legendary; it is used in such vehicles as the sporty Golf GTI (although on that car it has an extra 10 PS). In the new Jetta, this four cylinder TSI also delivers impressive driving performance with excellent fuel economy. Over 100 kilometres, it consumes just 6.9 litres of fuel (equivalent to 160 g/km CO2), which is directly injected into its four cylinders that can output up to 280 Newton metres of torque (from 1,800 rpm). Meanwhile, the engine enables a top speed of 236 km/h. The Jetta 2.0 TSI completes the sprint to 100 km/h in 7.5 seconds. Tuned to this engine's high torque is the 6-speed DSG that is available as an option.
Two direct injection diesel engines with 105 PS and 140 PS
1.6 TDI with 77 kW / 105 PS: The entry-level engine of the common rail TDI line-up for the Jetta is a 1.6 litre four cylinder with 77 kW / 105 PS (4,400 rpm) and a maximum torque of 250 Newton metres (1,500 to 2,500 rpm). Its combined fuel consumption (4.5 litres) represents a savings of 0.7 l/100 km compared to the previous model with unit injector technology. This TDI is available with a 7-speed DSG (4.7 l/100 km) or as a BlueMotion Technology version (5-speed manual, optional 7-speed DSG). Equipped with BlueMotion Technology and a manual gearbox, fuel consumption is reduced to 4.2 l/100 km (109 g/km CO2); the BlueMotion Technology version with DSG attains 4.3 l/100 km and 113 g/km CO2. All engine versions enable impressive driving performance. After just 11.7 seconds, the saloon reaches the 100 km/h mark from standstill; its top speed is 190 km/h.
The technology of the 1,598 cm3 four cylinder reflects the highest standard on the market in this vehicle segment. The diesel fuel is directly injected via a common rail system into the combustion chamber at a pressure of 1,600 bar; special piezo actuators control the multiple injections and fuel volumes with extreme precision.
2.0 TDI with 103 kW / 140 PS: The strongest common rail TDI in the Jetta line-up is a 1,968 cm3 16-valve four cylinder with 103 kW / 140 PS (at 4,200 rpm). At a low 1,750 rpm, the remarkably quiet TDI develops a maximum torque of 320 Newton metres (up to 2,500 rpm). Thanks to these key performance parameters, the TDI accelerates the manually shifted Jetta to 100 km/h in just 9.5 seconds. Its top speed is 210 km/h. Here too, combined fuel consumption is extremely low at 4.8 l/100 km; the same applies to its CO2 emissions of 126 g/km. Like the 1.6 TDI, the 2.0 TDI may also be ordered with DSG; its low combined fuel consumption of 5.3 l/100 km and similarly low CO2 emissions (138 g/km) would have been inconceivable for an automatic model in this performance class until just recently.
Injection pressures of up to 1,800 bar and special eight-hole injection nozzles ensure especially fine atomisation of the diesel fuel in the 2.0 TDI. Piezo in-line injectors are responsible for operating the injection nozzles. In this process, electrically controlled piezo crystals initiate injection in fractions of a second with the support of a hydraulic element. Compared to conventional solenoid valves, piezo technology enables more flexible injection processes with smaller, more precisely metered fuel quantities and multiple injections with up to 7 individual injections per work cycle. The advantages: very quiet and smooth engine running, spontaneous response behaviour and low fuel consumption and emissions.
BlueMotion Technology in detail
Stop/Start system: The driver approaches a red light, brakes the Jetta to a stop, shifts into neutral and takes the foot off the clutch (with DSG it is sufficient to press the brake pedal). This causes the engine to shut off momentarily. In the multifunction display the text "Start (A) Stop" appears. As soon as the traffic light turns green again, the driver depresses the clutch (or with DSG simply releases the brake), and the engine starts, the "Start (A) Stop" text is cleared, the driver engages a gear and resumes driving. Essentially, the driver does not need to perform any extra operating steps compared to a conventional car, yet saves up to 0.2 litres per 100 kilometres in the city using the Stop/Start system.
Unlike vehicles without the Stop/Start system, the BlueMotion Technology models have an extra battery data module (for acquiring momentary battery charge status), a heavy-duty engine starter, a DC/DC converter (guarantees voltage stability in the vehicle's electrical system) and an exceptionally durable deep-cycle glass mat battery on board.
Battery regeneration: Regeneration helps to utilise the energy expended in driving as ideally as possible. During coasting and braking phases of the Jetta – i.e. whenever the driver releases the accelerator pedal or brakes – the system elevates the voltage of the alternator (generator), and this electricity is used to bulk charge the vehicle's battery. Thanks to this alternator control as a function of engine efficiency, and the optimally charged battery that results, the voltage of the alternator can be reduced whenever this is desirable – e.g. when accelerating or while constantly maintaining a desired speed. The alternator may even be shut off entirely. This relieves engine load, which in turn reduces fuel consumption. In addition, the battery always optimally charged supplies the vehicle's electrical system with sufficient energy during the stopped phase of the engine (e.g. at traffic lights). Battery regeneration requires special software for energy management and modified engine controller software.
Gearbox with five, six or seven gears
As an alternative to the 5 and 6-speed manual gearboxes, the new Jetta will also be offered with either a 6-speed or 7-speed dual clutch gearbox (DSG), depending on the engine. Both DSG versions are characterised by maximum economy and shifting dynamics, which have never been attained to this extent before. Besides having different numbers of forward gears, another way in which the DSG systems differ technically is in their clutch types. While two dry clutches are used in the 7-speed DSG, the dual clutch of the 6-speed DSG runs wet in an oil bath.
True of both gearboxes: more than any other automatic, the dual clutch gearboxes have the potential to reduce fuel consumption and thereby emissions. Compared to a manual transmission, gains may be as much as 12 percent, depending on the engine, and even 20 percent compared to an automatic with torque-converter clutch. The two DSG versions are application-specific. While the 6-speed DSG shines when paired with torque-strong engines (up to 350 Newton metres), the 7-speed DSG is especially effective in combination with smaller engines (up to 250 Newton metres torque).
Running gear: MacPherson-type in front, multilink in rear
In its driving properties, the new Jetta is also one of the safest automobiles in the world. All Jetta versions worldwide are equipped with the latest generation of the electronic stabilisation programme (ESP) as a standard feature. The running gear tuning is as safe as it is comfortable and dynamic. A MacPherson strut-type front suspension with coil springs and telescoping shock absorbers is used in the Jetta. At the rear, a multi-link system is at work with independent wheel suspension, gas dampers and separate springs. Anti-roll bars on the front and rear running gear optimise handling properties. The Jetta's smooth yet precise electro-mechanical power steering also has a positive effect on the car's comfort, performance and active safety.
Notes:
TDI, TSI, DSG and Twincharger are registered trademarks of Volkswagen AG or other companies of the Volkswagen Group in Germany and other countries.
Features, technical data and prices apply to models offered in Germany. They may differ in other countries.