The ultra designation stands for the comprehensive claim of Audi to design its products and production processes to be sustainable. The most efficient engines of a model series, gasoline or diesel, carry the ultra label. In the Audi A1* and A1 Sportback* these are the models with the new three-cylinder engines – the 1.0 TFSI and the 1.4 TDI.
Compact and refined: the 1.0 TFSI with three cylinders (preliminary figures)
The most compact of the three gasoline engines in the new Audi A1 and A1 Sportback is the 1.0 TFSI, which was essentially re-designed from the ground up. It is the first three-cylinder gasoline engine in the history of the Audi brand. From 999 cc of engine displacement (bore x stroke: 74.5 x 75.4 mm [2.9 x 3.0 in]), it has an output of 70 kW (95 hp) and 160 Nm (118.0 lb-ft) of torque. The 1.0 TFSI propels the Audi A1 from 0 to 100 km/h (62.1 mph) in 10.9 seconds with a manual transmission; its top speed is 186 km/h (115.6 mph). NEDC fuel consumption is just 4.3 liters per 100 kilometers (54.7 US mpg) (99 g CO2 per kilometer [159.3 g/mi]) – that is why the 1.0 TFSI engines carry the ultra label.
Acceleration and top speed figures for the 1.0 TFSI engine in combination with the seven-speed S tronic are identical; here, the combined fuel consumption is 4.4 liters per 100 kilometers (53.5 US mpg) (103 g CO2 per km [165.8 g/mi]). Key performance data for the A1 Sportback with a manual transmission or S tronic: 11.1 seconds for sprint from 0 to 100 km/h (62.1 mph), 186 km/h top speed (115.6 mph) and 4.3/4.4 liters per 100 kilometers (54.7/53.5 US mpg) (99/103 g CO2 per km [159.3/165.8 g/mi]).
Lightweight design: just 88 kilograms (194.0 lb) of weight
The new three-cylinder weighs just 88 kilograms (194.0 lb) without add-on parts. It shares some sophisticated solutions with the two 1.4 TFSI engines that belong to the same engine family: its crankcase is made of cast aluminum. Throughout the crankcase the masses are minimal, and friction losses are low; the piston pins have a DLC coating for extremely smooth operation. 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 of the new 1.0 TFSI; 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. The cylinder head incorporates the exhaust manifold – which is an important component of effective thermal management. The cylinder head has its own cooling loop, as does the crankcase; the coolant stays in the hot running phase there to warm up the engine as quickly as possible.
Integration of the intercooler into the intake manifold results in short gas paths and spontaneous buildup of charge pressure which can reach a relative pressure of up to 1.4 bar. The electrically actuated wastegate of the turbocharger operates with great precision. The common rail system builds fuel injection pressure up to 250 bar – a new top figure in the TFSI sector. Their five-hole injectors can deliver three individual injections per work cycle.
Torque-strong and highly efficient: the 1.4 TDI
The 1.4 TDI produces 66 kW (90 hp) and delivers 230 Nm (169.6 lb-ft) of torque between 1,500 and 2,500 rpm. It accelerates the Audi A1 with a manual transmission fro 0 to 100 km/h (62.1 mph) in 11.4 seconds and has a top speed of 182 km/h (113.1 mph). The car’s NEDC fuel consumption is only 3.4 liters per 100 kilometers (69.2 US mpg) (with S tronic: 3.6 liters [65.3 US mpg]) – which equates to CO2 emissions of 89 (94) grams per kilometer (143.2 (151.3) g/mi). In the A1 Sportback the figures are: 11.6 seconds, 182 km/h, 3.4 (3.6) liters (69.2 (65.3) US mpg) and 91 (94) g/km (146.5 (151.3) g/mi). Their high efficiency has earned the 1.4 TDI engines the ultra label.
The 1.4 TDI has an engine displacement of 1,422 cc based on its 79.5 millimeters (3.1 in) bore and 95.5 millimeters (3.8 in) stroke. Its crankcase is made of an aluminum-silicon alloy – which is a big exception among the competition – and it weights no more than 17 kilograms (37.5 lb); the entire engine weighs in at just 132 kilograms (291.0 lb). The piston sleeves made of cast iron are thermally joined; the weights of the pistons and connecting rods have been reduced. Piston clearance, ring contour and ring pretensioning have been optimized for low friction losses.
High standards: the modular efficiency system
Efficiency modules of the three-cylinder diesel include its two-stage oil pump and separation of coolant loops for the crankcase and cylinder head. The camshafts have sophisticated needle bearings, and the layout of the valve train module is similar to that of the 1.0 TFSI. A balancer shaft, which rotates counter to the crankshaft, ensures quiet running.
The common rail injection system builds up to 2,000 bar of pressure, and the seven-hole injectors generate a highly precise spray pattern. The vanes of the turbocharger are adjustable; the intercooler is integrated in the intake manifold. The water-cooled low-pressure exhaust recirculation system (EGR), which merges in directly before the charger, reduces nitrogen oxide emissions when the engine is hot and at moderate to high loads; the uncooled high-pressure EGR is primarily responsible for the hot running phase. The entire exhaust system was designed for low-loss flow and early startup in cold starts based on its compact construction near the engine.
Gasoline engines: direct injection and turbocharging
Two versions: the 1.4 TFSI
The 1.4 TFSI is available in two versions. It has 1,395 cc of displacement (bore x stroke: 74.5 x 80.0 mm [2.9 x 3.1 in]), and it is equipped with a package of technologies similar to that of the 1.0 TSFI. The first version the four cylinder generates 92 kW (125 hp) and 200 Nm (147.5 lb-ft) of torque, the latter of which is available between 1,400 and 4,000 rpm. In this Audi A1, with the seven-speed S tronic, the sprint from 0 to 100 km/h (62.1 mph) takes 8.8 seconds, and its top speed is 204 km/h (126.8 mph). It has a combined fuel consumption of just 4.9 liters per 100 kilometers (48.0 US mpg) (112 g CO2 per km [180.2 g/mi]).
The Audi A1 with a manual transmission has the same figures for the standard sprint and top speed; in the NEDC cycle it consumes 4.9 liters of fuel per 100 kilometers (48.0 US mpg) (115 g CO2 per km [185.1 g/mi]). The values are similar in the Audi A1 Sportback: 8.9/8.9 seconds for the sprint from 0 to 100 km/h (62.1 mph) with manual transmission or S tronic, 204/204 km/h (126.8/126.8 mph) top speed, 5.1/4.9 liters per 100 kilometers (46.1/ 48.0 US mpg) fuel consumption (118/112 g CO2 per km [189.9/180.2 g/mi]).
Especially interesting is the new 1.4 TFSI with COD (cylinder on demand) and the same displacement of 1,395 cc as well as many high-end solutions. It delivers 110 kW (150 hp) and 250 Nm (184.4 lb-ft) of torque, the latter between 1,500 and 3,500 rpm. In the A1, the four-cylinder engine enables strong driving performance with 7.8 seconds for the standard sprint and a top speed of 215 km/h (133.6 mph); yet it has a low combined fuel consumption of 4.7 liters fuel per 100 kilometers (50.0 US mpg) (109 g CO2 per km [175.4 g/mi]) The values are the same for the manual transmission and the seven-speed S tronic. In the A1 Sportback the figures – regardless of the type of transmission – are: 7.9 seconds, 215 km/h (133.6 mph) and 4.7 liters per 100 kilometers (50.0 US mpg) (109 g/km [175.4 g/mi]).
The 1.4 TSFI has cutting-edge efficiency technology aboard with the COD system. At loads up to 100 Nm (73.8 lb-ft), and when coasting, the system deactivates the second and third cylinders, provided that engine speed is between 1,400 and 4,000 rpm. Pins, which are extended electromagnetically, slide the so-called cam pieces – sleeves that each contain two different cam profiles – on the camshafts. 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 the 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 driver pushes the pedal for fast acceleration, the shut-down cylinders are reactivated. In the NEDC cycle, the COD system saves roughly 0.4 liters per 100 kilometers (62.1 mi). With a moderate driving style, this can be as high as 20 percent.
Performance engine: the 1.8 TFSI
The most powerful engine that Audi is offering for the new A1 and A1 Sportback is the new 1.8 TFSI with 141 kW (192 hp); it mobilizes 250 Nm (184.4 lb-ft) of torque over the broad range from 1,250 to 5,300 rpm. The top engine works together with the seven-speed S tronic as standard equipment. In the A1, the sprint from 0 to 100 km/h (62.1 mph) takes 6.8 seconds (A1 Sportback: 6.9 seconds); it reaches its top speed at 234 (234) km/h (145.4 mph). Combined fuel consumption is just 5.6 l/100 km (42.0 US mpg), which is equivalent to CO2 emissions of 129 grams per kilometer (207.6 g/mi).
The 1.8 TFSI, which offers 1,798 cc of displacement (bore x stroke 82.5 x 84.1 mm [3.2 x 3.3 in]), is full of very effective efficiency technologies. In part-load, an additional injection is made into the induction pipe of the FSI gasoline direct-injection engine. Two adjustable camshafts and the Audi valvelift system, which switches the stroke of the exhaust valves over two stages, ensure good filling of the combustion chambers. The thermal management system utilizes a high-performance rotary vane module and integration of the exhaust manifold in the cylinder head. Two balance shafts ensure very smooth running performance.
TDI engines: high torque
The TDI engines – the new 1.4 TDI ultra with three cylinders and the further developed 1.6 TDI – based on the modular diesel platform (MDB) of the Volkswagen Group. Both engines deliver a combination of strong torque with very smooth operation and minimal fuel consumption.
Powerful: the 1.6 TDI
The 1.6 TDI, with a displacement of 1,598 cc (bore x stroke 79.5 x 80.5 mm [3.1 x 3.2 in]) offers solutions similar to those of the 1.4 TDI ultra. They are the valve train module, minimized internal friction, separate coolant circulation loops, high and low-pressure AGR, a two-stage oil pump, intercooler in the intake manifold, emissions control near the engine and pneumatically adjustable guide vanes in the turbocharger.
The 1.6 TDI delivers very agile driving performance with its 85 kW (116 hp) of power and 250 Nm (184.4 lb-ft) of torque that is available from 1,500 to 3,200 rpm. The Audi A1 with a manual transmission springs from 0 to 100 km/h (62.1 mph) in 9.4 seconds and has a top speed of 200 km/h (124.3 mph). It consumes 3.5 liters of fuel per 100 kilometers (67.2 US mpg) and emits 92 grams of CO2 per kilometer (148.1 g/mi). Performance data is identical with the seven-speed S tronic, and fuel consumption is 3.7 liters per 100 kilometers (63.6 US mpg) (97 g CO2/km [156.1 g/mi]). The same applies to the A1 Sportback. The car’s performance figures are identical for both types of transmission as well with acceleration from 0 to 100 km/h (62.1 mph) in 9.5 seconds and a top speed of 200 km/h (124.3 mph). On the other hand, their fuel economy values differ; for the A1 (A1 Sportback) they are: 3.5 (3.7) liters of diesel per 100 kilometers [67.2 (63.6) US mpg] which equates to 92 (97) grams of CO2 per kilometer [148.1(156.1) g/mi].
Tailor-made: the transmission
Audi provides the right transmission for every engine in the A1 and A1 Sportback. For the 1.0 TFSI and the two TDI engines there is a standard five-speed transmission, and there is a six-speed transmission for the 1.4 TFSI engines with 92 kW (125 hp) and 110 kW (150 hp).
The most powerful TFSI gets a standard seven-speed S tronic. This transmission is optional for all other engines. The driver can operate the dual clutch S tronic transmission from either the selector lever or the shift paddles on the steering wheel. The automatic D mode is configured for maximum fuel economy; the gear shift points are sportier in the S mode. Hill hold assist is a standard feature.
The seven-speed S tronic consists of two sub-transmissions; two multi-plate clutches operate the gear wheels of gears that are on separate drive shafts. Both transmission structures are continuously active, but only one is connected to the engine at any one time. Shifts are performed by switching the clutches. This takes just a few hundredths of a second and occurs with no perceptibleinterruption to the flow of power – it is dynamic and comfortable.
At a weight of around 70 kilograms (154.3 lb), the compact seven-speed S tronic is exceptionally lightweight. Its clutches work without an oil supply, which boosts engine efficiency even more. The electric pump, which circulates the oil for the gear set area, operates as needed. The transmission ratio in the lower gears is short and sporty; the top gear is long to reduce engine speed.
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.