Audi A3 receives start-stop function with automatic transmission

Article by Christian Andrei, on August 25, 2010

For the first time, Audi has managed to combine its S tronic dual-clutch automatic transmission with the start-stop system. This is due to the brand’s technological knowledge partnered with its Modular Efficiency Platform. This is made available for the A3 1.6 TDI with its power output of 77 kW (105 hp) and for the 1.4 TFSI with a 92 kW (125 hp) output.

The start-stop system allows the engine to be turned off once the car comes to a complete stop. As long as the driver presses the brake pedal, the engine remains off. However, once the foot is released from the brake pedal, the system quickly turns on the engine again.

Aside from the already amazing performance, the A3 1.6 TDI has a fuel economy of 4.2 liters per 100 kilometers (56.00 US mpg) using diesel while the emission rating is at 109 grams of CO2 per kilometer (175.42 g/mile).

Meanwhile, the A3 1.4 TFSI uses 5.3 liters per 100 kilometers (44.38 US mpg) with unleaded premium and has emission of 124 g/km (199.56 g/mile). The 77 kW (105 hp) output of the A3 1.6 TDI at 4,400 rpm from a 1,598 cc displacement is due to the four-cylinder TDI.

Maximum torque is at 250 Nm (184.39 lb-ft) between rpm of 1,500 and 2,500. When paired with the S tronic transmission, the A3 1.6 TDI can reach speeds of 194 km/h (120.55 mph) and it becomes capable of accelerating from 0 to 100 km/h (0 to 62.14 mph) in just 11.7 seconds.

On the other hand, the A3 1.4 TFSI can deliver a power of 92 kW (125 hp) from a 1,390 cc displacement. Peak torque is at 200 Nm (147.51 lb-ft) from 1,500 and 4,000 rpm.

With the S tronic automatic transmission, the top speed is at 203 km/h (126.14 mph) while acceleration takes 9.3 seconds to go from 0 to 100 km/h (62.14 mph). In addition to the combination of the start-stop system with the automatic transmission, these two A3 models also come equipped with the on-board energy-recovery system.

The energy that is not used is often stored in the car’s battery, however when braking or if the A3 is coasting, this system enables the alternator to recover the stored energy. The energy recovered is then supplied to its electrical system especially during acceleration; thereby lowering the load present on the alternator resulting in more fuel saved.

The combination of the start-stop system and energy-recovery system makes it very ideal for driving the A3 is urban areas where most of its customers are located. Both models of the A3 will be offered as either a three-door or a Sportback by November 2009.

Audi reveals that the A3 1.4 TFSI is still priced at €23,700 for the 3-door variant and €24,600 for the Sportback version. Meanwhile, the A3 1.6 TDI will come in at a €25,500 base price for its 3-door variant while the Sportback is priced at €26,400.

Press Release

World premiere: Audi combines start-stop function with automatic transmission

  • Convenience and efficiency combined
  • Use in Audi A3 1.6 TDI and 1.4 TFSI
  • Innovations from Audi's Modular Efficiency Platform

Thanks to the synergetic impact of technologies from the Modular Efficiency Platform coupled with Audi's technological expertise, the start-stop system is now being offered in conjunction with an automatic transmission. The A3 1.6 TDI with 77 kW (105 hp) and the 1.4 TFSI with 92 kW (125 hp) combine - for the first time - the start-stop function with the innovative S tronic dual-clutch transmission.

The start-stop system turns the engine off as soon as the vehicle comes to a stop; the engine stays off as long as the driver depresses the brake pedal. As soon as the driver removes their foot from the brake pedal, start-stop turns the engine back on - quietly, conveniently and quickly.

In addition to impressive driving performance, these A3 models sip an exemplary 4.2 liters of diesel per 100 kilometers (56.00 US mpg) (1.6 TDI) or just 5.3 liters (44.38 US mpg) of premium unleaded (1.4 TFSI). This means that the A3 1.6 TDI emits just 109 grams of CO2 per kilometer (175.42 g/mile). With regard to the A3 1.4 TFSI, emissions amount to 124 g/km (199.56 g/mile).

The A3 1.6 TDI is powered by a four-cylinder TDI, which delivers 77 kW (105 hp) at 4,400 rpm from a displacement of 1,598 cc and - between 1,500 and 2,500 rpm - steadily transmits 250 Nm (184.39 lb-ft) of torque to the crankshaft. In conjunction with the S tronic, the TDI propels the three-door A3 from 0 to 100 km/h (0 to 62.14 mph) in 11.7 seconds en route to a top speed of 194 km/h (120.55 mph).

The A3 1.4 TFSI delivers 92 kW (125 hp) from a displacement of 1,390 cc; its maximum torque is 200 Nm (147.51 lb-ft) between 1,500 and 4,000 rpm. In conjunction with S tronic, this vehicle accelerates from 0 to 100 km/h (62.14 mph) in 9.3 seconds and tops out at 203 km/h (126.14 mph).

Also standard in both A3 models is an on-board energy-recovery system. During braking and coasting phases, this intelligently controls the alternator to recover energy, which is temporarily stored in the battery. This energy is then fed back into the electrical system during acceleration - thus reducing the load on the alternator. That saves fuel. The energy-recovery system and the start-stop system unleash their potential in particular in urban-driving conditions - precisely where most customers drive every day.

Audi will begin selling the A3 1.6 TDI and the A3 1.4 TFSI as a three-door and as a Sportback in November 2009. Prices for the 1.4 TFSI remain unchanged at €23,700 (3-door) and €24,600 (Sportback). The new 1.6 TDI with S tronic will sell at a base price of €25,500 for the 3-door and €26,400 for the Sportback.

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