The Audi A1 makes the start with four engines. Both TFSI gasoline engines and TDI diesel engines both cover a power range from 63 kW (86 hp) 90 kW (122 hp). All engines combine the technologies of turbocharging and direct injection turbocharged engines: the innovative concept associated with start-stop systems and retrieval, provides both high power and low power consumption. Its values are staged from 3.8 to 5.3 liters per 100 km.
The symbol represents the association TFSI direct injection and turbocharging, an association that the Audi was the first manufacturer to introduce to the world five years ago. These two technologies together very nicely. The fuel is directly injected by a strong swirling, it cools the walls of the combustion chamber. The temperature drops so, which solves the old problem of all turbocharged engines: the tendency to knock generated by combustion under high heat. Can Audi TFSI engines ensure its very high compression, a feature which greatly improves their efficiency.
The smaller of the two petrol engines is the 1.2 TFSI. It delivers a power of 63 kW (86 hp) and delivers the range from 1500 to 3500 1/min its maximum torque of 160 Nm Associated with 5-speed manual transmission, four-cylinder accelerates the A1 0-100 km / h in 11.7 seconds and makes it reach the maximum speed of 180 km / h. In the European cycle, it just 5.1 liters of fuel per 100 kilometers, or 118 grams of CO2 per km.
This new 1.2-liter perfectly illustrates the principle Audi to downsizing through a turbocharger. It has only two valves per cylinder, 1197 cm3 and was designed to display a decidedly low weight. The piston low preload and main bearings and connecting rod bearings in compact form are optimized to reduce friction and oil pump is regulated according to needs, energy-saving.
The cylinder block cast aluminum of 1.2 TFSI has an own independent cooling of the cylinder head. After starting, a regulated water pump ensures that water does not flow into the block, this allows quicker heating up the engine and shortens the phase frictional resistance increased due to cold oil.
The injection valves inject high pressure fuel into the combustion chambers at a pressure of up to 150 bar. The turbocharger has its own electric actuator that operates with speed and precision valve for regulating the boost pressure (wastegate) boost pressure rises spontaneously and consumption decrease in the partial load range. The cooler the air cooler is mounted in the intake manifold, which promotes the spontaneous responsiveness of the engine.
The 1.4 TFSI offers for him a power of 90 kW (122 hp). It develops a maximum torque of 200 Nm constant in the range between 1500 and 4000 rpm, the gasoline engine, the most powerful program A1, may also run at low speeds in almost all circumstances. A turbocharger charge air cooler cooled water pressurizes the four valves that mobilizes 1390 cm3.
Associated with the S tronic seven-speed, the 1.4 TFSI accelerates the A1 in 8.9 seconds from 0 to 100 km / h and leads to a top speed of 203 km / h. With the six-speed manual transmission that will follow later, he also reaches the same performance of 8.9 seconds and 203 km / h.
The average consumption by the European cycle is limited to 5.2 liters
100 km to the S tronic transmission and 5.3 for the manual transmission. On the A1 1.4 TFSI with S tronic, CO2 emissions are 119 g / km. (Preliminary figures for the A1 1.4 TFSI 6-speed)
Efficiency of future engines TDI
The 1.6 TDI which has a displacement of 1598 cc is characterized by internal friction minimized. The most important measures concern the regulated oil pump, piston rings, the process of honing the cylinder barrels, timing belt and bolts cast aluminum pistons.
DLC coating is a new technology borrowed from the construction of racing engines. DLC stands for Diamond-Like-Carbon and results in a thin layer of diamond-like carbon.
The piezo injectors in the common rail system carry up to six separate injections per cycle, which improves the quality of combustion, venting and correct operation. In the intake manifold, a tangential channel spins the incoming air, the helical channel used for filling. A turbocharger with variable geometry turbine and a system of unbridled aspiration and charge air coolers are perfect this principle.
Audi offers the 1.6 TDI versions. The most powerful version delivers 77 kilowatts (105 hp) and 250 Nm available between 1500-2500 rpm, it is associated with a manual transmission 5-speed. This compact four-valve TDI accelerates the A1 0-100 mph in 10.5 seconds and reach a top speed of 190 km / h, contenting himself with an average power consumption of just 3.9 liters per 100 km.
The second version of the 1.6 TDI will be available later (the figures given here are provisional), reached a power of 66 kW (90 hp) and torque of 230 Nm available between 1,500 and 2,500 rpm.
In association with the manual five gear ratios, diesel accelerates the A1 in 11.5 seconds 0-100 km / h. The maximum speed is 182 km / h and consumption, which displays 3.8 liters per 100 km for CO2 emissions of 99 grams per km, is avant-garde.
The four engines of the A1 to use a technology program from Audi’s modular efficiency, system recovery voltage regulator enables intelligent energy recovery for the alternator phases during braking and deceleration. This energy is stored in the battery during acceleration later, it is injected into the network edge and allows the alternator and thus spare the engine.
The Start-Stop system, once this technology modular program efficiency, is also standard on all four engines. He shut the engine off as long as the shifter is in neutral and the driver’s foot is not on the clutch pedal. When the driver switched gears, the engine is started: quietly, comfortably and fast. This start-stop system, which can be disabled by the driver, harmonizes perfectly with the S tronic seven-speed mounted with the 1.4 TFSI.
A luxury box: S tronic seven reports
The seven-speed S tronic combines the comfort of a converter automatic transmission to the dynamism and efficiency of a manual gearbox. It consists of two half-boxes and includes two multi clutches that control different ratios.The large clutch E1 outside transmits torque to the shaft which carries the full reports of odd gears 1, 3, 5 and 7 and around which a hollow tree. It is connected to the clutch more compact E2 which is incorporated in its big brother and operates the even gears of gears 2, 4 and 6 and reverse.
The two half-gears are permanently activated, but only one of them is taken on the engine. For example, when the third report (on the first half-box) is engaged and the driver accelerates, the second semi-box already engages the fourth report. The gear shifting is done by changing the clutch.
This change takes only a few hundredths of a second and realized substantially without interruption of torque and is so smooth, light and dynamic that it is barely noticeable.
The S tronic seven-speed is with its 37 cm length compact and weighs about 70 kg, a weight is extremely low for a high end box. His two clutches run dry, so no oil supply, further increasing the already high performance of the box.The control unit is supplied with oil by an electric pump controlled as required. The setting of seven reports prefers a sporty drive, the latest report, however, being extended for a reduction in fuel consumption.
The driver can control the 7-speed S tronic by the selector lever or, optionally, by paddles on the steering wheel like a sports car. In addition, two fully automatic modes are available. In D mode, the management of the box turns the engine at low speeds as often as possible to save fuel. In S mode, the driving style is sporty and higher rpm. A hill start assistant that prevents the reverse Hill-A1 is here proposed series, the A1 equipped with manual transmission, it can be ordered separately.