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Audi A5 Sportback: engines and fuel efficiency (2/7 >)

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Continued - At launch, the A5 Sportback is available with three gasoline (petrol) and three diesel engines, with three more engines to follow by the middle of next year.

All of the engines adopt direct injection technology, TDI for the diesels, FSI for the gasoline ones (the profound swirling of the directly injected fuel cools the combustion chamber, allowing for a higher compression ratio in the TFSI with improved efficiency), and all come also with a recuperation system to recover energy during braking and deceleration and store it temporarily in the battery and comply with the Euro 5 emissions standard.

 2.0 TDI

2.0 TDI: 1968cc, 4 cylinders, 16 valves, common-rail with piezo injectors and turbo charging variable turbine geometry, generating 125 kW/4200 rpm and 350 Nm/1750-2500 rpm.

Audi A5 Sportback 2.0 TDI engine: output and torque graph.

The four-cylinder 2.0 TDI unit comes with front-wheel drive (an all-wheel drive quattro version will be available later) and consumes 5.2 litres of fuel per 100 km (45.23 US mpg, 54.29 imperial mpg, 19.23 kms/ litre) on average, which corresponds to CO2 emissions of 137 grams per km (220.48 g/mile). All consumption and performance figures are based on Audi information.

From a displacement of 1,968 cc, this engine produces 125 kW (168 bhp, 170 hp) and 350 Nm (258.15 lb-ft) of torque at 1750 - 2500 rpm, allowing the A5 Sportback to sprint from zero to 100 km/h (62.14 mph) in 8.7 seconds, up to a top speed of 228 km/h (141.67 mph).

A second version of the 2.0 TDI will produce 105 kW (141 bhp, 143 hp) and 320 Nm (236.02 lb-ft) of torque. This engine will be coupled with the stepless multitronic automatic transmission, instead of the six-speed manual transmission of the 125 kW version.

The 2.0 TDI has dual camshafts actuating 16 valves in the cylinder head, with switchable swirlers in the intake manifold to adapt the inflow of air to the prevailing load and engine speed.

The common rail injection system builds pressures up to 1,800 bar to provide fine vaporization of the fuel for better mixture air / fuel mixture. There are as many as five injections per work cycle for a finely moderated increase in pressure in the cylinder and a soft combustion process, which also enhance engine acoustics.

The injectors have eight-port nozzles and operate according to the piezo principle, in which hundreds of tiny ceramic platelets are packed on top of each other. When an electric voltage is applied, they change their crystalline structure – the platelets expand slightly and this movement is transmitted to the injection needles. The injectors close again after one to two milliseconds – in some cases after having injected less than one thousandth of a gram of fuel.

The turbocharger has adjustable vanes on the exhaust side. When the driver steps hard on the gas with the engine at low revs, the blades are flattened. The smaller inlet cross-section forces the exhaust gas to flow in at higher speed. The turbine wheel turns faster, the pumped volume of fresh air increases and the boost pressure builds up instantly. A pulse damper reduces the vibrations of the turbocharger.

2.7 TDI: 2698cc, 6 cylinders, 24 valves, common-rail with piezo injectors and turbo charging variable turbine geometry, delivering 140 kW/3500-4400rpm and 400 Nm/1400-3250rpm.

AudA5 Sportback 2.7 V6 TDI engine: output and torque graph.

The 125 kW (170 hp) 2.0 TDI units redline at an unusually high (for a diesel engine) 5,400 rpm and feature improved thermodynamics in the combustion chambers.

Up to 60 percent of the exhaust gas can be recirculated, resulting in a relatively cool and oxygen-lean combustion and thus low raw emissions of oxides of nitrogen. Like all of the engines in the model series, the A5 Sportback 2.0 TDI complies with the Euro 5 standard.

 2.7 V6 TDI

Two V6 TDI units feature variable geometry turbochargers, common rail piezo injection systems and a high-performance exhaust gas recirculation system, with crankcases made of vermicular graphite cast iron that is lightweight and strong.

The 2.7-liter V6 TDI produces 140 kW (188 bhp, 190 hp) and 400 Nm (295.02 lb-ft) of torque between 1,400 and 3,250 rpm while consuming 6.0 litres of fuel per 100 km (39.20 US mpg, 47 imperial mpg, 16.67 kms / litre) in the EU driving cycle.

3.0 TDI: 2967cc, 6 cylinders, 24 valves, common-rail with piezo injectors and turbo charging variable turbine geometry, delivering 176 kW/4000-4400rpm and 500 Nm/1500-3000rpm.

Audi A5 Sportback 3.0 TDI V6 engine: output and torque graph.

The 2,698-cc engine is paired to the front-wheel drive system via a 6-speed manual transmission. It achieves the 0-100 km/h in 8.2 seconds, on its way to a top speed of 235 km/h (146.02 mph). The multitronic will be available as an option starting this fall.

 3.0 V6 TDI

Displacing 2,967 cc, the three-litre TDI engine generates 176 kW (236 bhp, 239 hp) and applies 500 Nm (368.78 lb-ft) of torque to the crankshaft between 1,500 and 3,000 rpm.

The sprint from zero to 100 km/h (62.14 mph) takes 6.1 seconds. Top speed is electronically limited to 247 km/h (153.48 mph). The top-of-the-line diesel’s average fuel economy is 6.6 litres/100 km (35.64 US mpg, 42.77 imperial mpg, 15.15 kms/ litre).

The seven-speed S tronic delivers the engine’s power to the quattro permanent all-wheel drive system. A model with a manual transmission will follow in the fall.

 2.0 TFSI

2.0 TFSI: 1984cc, 4 cylinders, 16 valves, direct petrol / gasoline injection, turbo charging, two balancer shafts, variable inlet camshaft timing and plastic manifold, generating 155 kW/4300-6000 rpm and 350 Nm/1500-4200 rpm.

Audi A5 Sportback 2.0 TFSI direct injection petrol engine: output and torque graph.

To obtain lower operating vibrations, the 2.0 TFSI petrol / gasoline engine has an adjustable intake cam shaft and two balance shafts. The oil pump is operated under volumetric flow control and at two speeds, which also helps reduce the consumption.

The 1,984-cc 2.0 TFSI has six-port nozzles to inject the fuel into the combustion chambers at a pressure of 150 bar, with further support for efficient combustion from the form of valves which swirl the charge.

The turbocharger is water-cooled, and its turbine blades and vanes are optimized for improved start-up performance. The intercooler also combines high efficiency with low weight and small size.

The gasoline TFSI engines are equipped with the Audi valvelift system (AVS) for variable control of valve lift, to enhance performance and reduce fuel consumption.

Audi says that the AVS system ensures that lift of the exhaust valves is switched in two stages depending on need. This reduces flushing losses in the combustion chamber and also ensures that the optimal flow of the exhaust gas is directed to the turbocharger.

The 1,984 cc 2.0 TFSI is available in two performance versions: 132 or 155 kW.

 155 kW 2.0 TFSI

The 155 kW (208 bhp, 211 hp) version generates a maximum torque of 350 Nm (258.15 lb-ft) spread between 1,500 and 4,200 rpm.

Coupled with the seven-speed dual clutch S tronic transmission and the quattro permanent all-wheel drive system, it accelerates the five-door coupe to 100 km/h (62.14 mph) in 6.6 seconds, up to a top speed of 241 km/h (149.75 mph).

Average fuel consumption is 7.4 litres per 100 km (31.79 US mpg, 31.15 imperial mpg, 13.5 kms / litre).

Three additional variants will be introduced during the course of the year: quattro all-wheel drive with manual transmission and front-wheel drive with multitronic or six-speed manual transmission.

 132 kW 2.0 TFSI

The 132 kW (177 bhp, 180 hp) version of the 2.0 TFSI comes exclusively with front-wheel drive, and will be coupled with either a manual or multitronic transmission. Its maximum torque of 320 Nm (236.02 lb-ft) is available between 1,500 and 3,900 rpm.

 118 kW 1.8 TFSI

A 1.8-liter TFSI engine is scheduled for early next year, with a maximum output of 118 kW (158 bhp, 160 hp), with front-wheel drives and a multitronic transmission. A manual version will also be available in 2010, as an entry-level model.

 195 kW 3.2 V6 FSI

The strongest engine in the A5 Sportback is the 3.2-liter V6 FSI also uses the Audi valvelift system (AVS) for variable control of valve lift. In this case, the valve lift controller affects the intake valves (unlike the 2.0-litre engine, where the exhaust valves are affected by the valve lift control).

The system adjusts the volume of intake air over a wide range, and the throttle can remain wide open even at part load, reducing throttle losses and improving efficiency. In addition to the  intake valves lift controller, the 3,197-cc V6 comes also with a variable intake manifold.

The V6 maximal output is 195 kW (261 bhp, 265 hp), with a maximal torque of 330 Nm (243.4 lb-ft) between 3,000 and 5,000 rpm.

With the S tronic transmission and the quattro all-wheel drive, it accelerates the A5 Sportback to 100 km/h (62.14 mph) in 6.6 seconds on the way to a limited top speed of
250 km/h (155.34 mph). Its fuel consumption averages 9.3 litres per 100 km (25.29 US mpg, 30.35 imp. mpg, 10.75 kms / litre).

 Recuperation

All A5 Sportback models are equipped with a recuperation system that exploits the kinetic energy during deceleration. During the coasting and braking phase, the alternator can convert the kinetic energy into electrical energy that is stored temporarily in the battery.

When the car accelerates again, the battery feeds the energy back to improve fuel efficiency by reducing the load on the alternator, since the latter is driven by the engine. All models with a manual transmission are also equipped with a gear-change indicator that recommends the best gear for optimal efficiency.

 Start-Stop

All A5 Sportback versions with any of the three 2.0-liter engines and a manual transmission come standard with the new start-stop system from Audi. When it comes to a stop at a traffic light or an intersection, with the shift lever in neutral and the driver’s foot taken off the clutch, the system’s control unit shuts down the engine. Audi adds that on a hill or a downgrade, the brake system maintains the brake pressure unless the slope is greater than 10 percent.

A powerful starter restarts the engine as soon as the driver fully depresses the clutch. While the driver puts the vehicle in gear, the engine speeds up; by the time the driver releases the clutch, it has reached idle speed.

 Battery power

The start-stop system requires a particularly strong battery that continues to function even at very low outdoor temperatures. During the initial warm-up period of the engine, the system remains inactive so that the motor oil, the coolant and the interior can be brought to temperature more quickly. The driver can also deactivate the start-stop system at any time by pushing a button.

Audi claims that in the standardized driving cycle, the start-stop system reduces consumption by roughly 0.2 litres/100 km, which corresponds to approximately five grams of CO2/km (8.05 g/mile). The gain in efficiency is greater in everyday driving, especially if the majority of daily drives are less than ten kilometres long and interrupted by many traffic lights.

The new start-stop system is linked to another new solution from the modular efficiency platform, represented by the driver information system with efficiency program. It features a gear-change indicator and continuously analyzes the flows of electricity within the vehicle. It can also show detailed energy consumption figures for equipment such as the air conditioning or rear window defroster, which can be as much as one additional litre of fuel per 100 kilometres. If necessary, the system also provides other tips such as to close the windows while the air conditioner is on.

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