The engine lineup for the new Audi A3 comprises altogether six units: three gasoline and three diesel engines. Their power output ranges from 81 kW (110 hp) to 140 kW (190 hp). As supercharged direct-injection engines, all units embody the rightsizing philosophy of Audi and meet the emissions standard Euro 6. With the 1.0 TFSI, Audi for the first time offers a three-cylinder engine in the A3 model series.
More power and greater efficiency: the new 1.0 TFSI
The 1.0 TFSI with a displacement of 999 cm3 provides 85 kW (115 hp) and delivers 200 Nm (147.5 lb-ft) of torque at 2,000 to 3,500 rpm. Its NEDC consumption rate is limited to 4.5 liters per 100 kilometers (52.3 US mpg) – a CO2 emission level of 104 grams per kilometer (167.4 g/mi) (manual transmission). The new entry-level gasoline engine is efficient at no cost to driving pleasure. It accelerates the A3 from 0 to 100 km/h (62.1 mph) in 9.7 seconds, and presses forcefully ahead up to a top speed of 206 km/h (128.0 mph).
The compact design of the three-cylinder engine and its aluminum crankcase make for a weight of only 88 kilograms (194.0 lb). The forged connecting rods and aluminum pistons are so finely balanced that the engine does not need a balancer shaft for quiet and smooth running. There are twelve valves at work in the cylinder head; their intake and exhaust camshafts can be adjusted by 50 and 40 degree crank angles, respectively. The valve train module in which they rotate is lightweight and rigid. Below the module lies the exhaust manifold integrated in the cylinder head – an important part of high-performance thermal management.
Just like the crankcase, the head also has its own cooling circuit. Throughout the crank drive the masses are low in magnitude, as is the friction loss. The common-rail system builds up to 250 bar of injection pressure – a best value among TFSI engines.
Intelligent efficiency: the 1.4 TFSI COD ultra
The 1.4 TFSI COD ultra has a displacement of 1,395 cm3 and delivers 110 kW (150 hp); its 250 Nm (184.4 lb-ft) torque is available at 1,500 to 3,500 rpm. The sprint from 0 to 100 km/h (62.14 mph) takes just 8.1 seconds in the new Audi A3, the thrust ends at 220 km/h (136.7 mph) It consumes on average 4.5 liters per 100 kilometers (52.3 US mpg), corresponding to 105 grams CO2 per kilometer (169.0 g/mile) (manual transmission).
The four-cylinder engine comes with a technology package similar to that of the 1.0 TFSI and additionally offers the pioneering efficiency technology COD (cylinder on demand). At loads up to 100 Nm (73.8 lb-ft), and when coasting, the system deactivates the second and third cylinders, provided that the engine speed lies between 1,400 and 4,000 rpm.
Electromagnetically extended pins move the cam pieces on the cam shafts – sleeves that each carry two different cam sections. When the zero-stroke profiles are rotating above the valves, they do not actuate the valves, and the valve springs keep them closed. Injection and ignition are deactivated. The switchover process takes just milliseconds. The operating points in active cylinders one and four are displaced toward higher loads, increasing efficiency. Even with a firing angle of 360 degrees, vibration of the 1.4 TFSI COD is still very low and the engine is quiet. When the accelerator pedal is depressed, the shut-down cylinders are reactivated.
New high-tech engine: the 2.0 TFSI
From a displacement of 1,984 cm3 the 2.0 TFSI generates 140 kW (190 hp); it provides 320 Nm (236.0 lb-ft) of torque between 1,500 and 4,200 rpm. The all-new engine design combines sporty power and exemplary efficiency: In just 6.7 seconds the new A3 with the seven-speed S tronic sprints from 0 to 100 km/h (62.1 mph), reaching a top speed of 244 km/h (151.6 mph). The manual transmission model attains an NEDC consumption rate of just 5.5 liters per 100 kilometers (42.8 US mpg), which equates to CO2 emissions of 126 grams per km (202.8 g/mi).
The high-tech four-cylinder engine embodies a new strategy: the continued development by Audi of successful engine downsizing into rightsizing. In a moderate gear, customers of the new Audi A3 experience the consumption benefits of a smaller unit; for a sporty driving style they need not accept its disadvantages. The relatively large displacement is no handicap, but rather a prerequisite for an innovative combustion process.
The new combustion process takes advantage of a longer expansion of the combustion gas in order to convert thermal energy more effectively. This is possible in the 2.0 TFSI thanks to the real shortening of the compression phase in conjunction with a higher compression ratio of now 11.7:1.
The intake valves close much earlier than usual – in interplay with an increased pressure in the intake manifold they reduce throttle losses during intake in the partial load range. Owing to the shortened compression, for compressing a particular certain mass of fresh gas to the compression pressure of a comparable 1.4-liter engine, the 2.0 TFSI requires about the same effort as the 1.4 TFSI. In the subsequent expansion phase, the engine delivers work and fully exploits the two liters of displacement. The approximately 40 percent longer expansion of the combustion gas compared with the 1.4 TFSI leads to more engine work delivered at the same rate of fuel consumption. This leads to a significant increase in efficiency in wide areas of the characteristic map.
So that the charge sufficiently swirls despite the short inlet time, the combustion chambers, piston recesses and inlet ducts as well as the turbocharging of the new 2.0 TFSI are specially tuned to the new combustion method. At higher loads, the Audi valvelift system closes the intake valves later and thereby allows higher filling for good power and torque delivery. The injection pressure is increased to 250 bar.
The technical finesses of the new 2.0 TFSI also include the exhaust manifold integrated in the cylinder head, the rotary slide module for thermal management, the Audi valvelift system (AVS) for the intake valves and the electrical wastegate of the turbocharger and dual injection – in the partial load range indirect intake manifold injection direct injection.
Powerful: the 1.6 TDI
The 1.6 TDI with 1,598 cm3 displacement delivers 81 kW (110 hp) and between 1,500 and 3,000 rpm a torque of 250 Nm (184.4 lb-ft). For the standard sprint from 0 to 100 km/h (62.1 mph) the new A3 requires 10.5 seconds and reaches a top speed of 200 km/h (124.3 mph).
The compact diesel achieves outstanding fuel economy: Fuel consumption is just 3.8 liters of fuel per 100 kilometers (61.9 US mpg) on average, which corresponds to 99 grams of CO2 per kilometer (159.3 g/mi) (with S tronic).
The 1.6 TDI is distinguished by consistently minimized internal friction. This concerns, among other things, the oil pump, the piston rings, the honing process of the cylinder barrels, the toothed belt and the carbon-coated pins of the cast aluminum pistons. Per operating cycle the piezo injectors of the common rail system carry out up to six individual injections.
In the intake manifold, a tangential duct channel puts the incoming air into a selective swirl motion. In the neighboring spiral duct, an adjustable valve dispenses the intake quantity depending on the load and engine speed. When the valve closes, the intake proceeds only via the tangential duct. A charger with adjustable turbine geometry completes the overall concept.
Supreme: the 2.0 TDI
Audi offers two performance levels of the four-cylinder TDI with 1,968 cm3 displacement. The 2.0 TDI in the new Audi A3 optionally comes with 110 kW (150 hp) and 340 Nm (250.8 lb-ft) at 1,750 to 3,000 rpm or 135 kW (184 hp) and 380 Nm (280.3 lb-ft) at 1,750 to 3,250 rpm.
The 2.0 TDI boasts sophisticated solutions, with separate coolant loops, two balance shafts in the crankcase, a cylinder pressure sensor, greatly reduced internal friction and a common rail injection system that maintains the fuel at a maximum pressure of 2,000 bar. High- and low-pressure exhaust gas recirculation as well as elaborate exhaust aftertreatment ensures low pollutant emissions.
Even the 110 kW version delivers a superior performance: The new Audi A3 with S tronic and front-wheel drive attains the 100 km/h (62.1 mph) mark from rest in 8.2 seconds and reaches a top speed of 218 km/h (135.5 mph). In combination with the manual six-speed transmission, it consumes 4.0 liters of fuel per kilometers (58.8 US mpg) on average, or 105 grams CO2 per kilometer (169.0 g/mi).
The version with 135 kW (184 hp) combines high efficiency with even greater performance: Here the new Audi A3 with S tronic and quattro drive sprints to 100 km/h (62.1 mph)in 6.8 seconds, reaching a top speed of 230 km/h (142.9 mph). It consumes only 4.7 liters of fuel per 100 kilometers (50.0 US mpg) in the NEDC cycle and emits 124 grams CO2 per kilometer (199.6 g/mi).
The equipment, data and prices specified in this document refer to the model range offered in Germany. Subject to change without notice; errors and omissions excepted.