Audi Combines Start-Stop Function With S-tronic Automatic Transmission

We know that with the use of engine stop-start systems, fuel savings could be in the range of 5-10%. This is a important way to improve fuel efficiency. However, the engine stop-start system is mostly available with manual transmissions only (not including hybrid vehicles). As a consequence, this technology hasn’t used much even in Europe. Now things are going to change.

Audi has introduced an engine start-stop system on A3 models equipped with the S tronic dual-clutch automatic 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.

So far, the only models so far with this feature are the highly-efficient 1.6-liter TDI and 1.4-liter TFSI. Thanks to the start-stop system, fuel efficiency is improved and CO2 emissions decreases. The A3 1.6 TDI is powered by a four-cylinder TDI, which delivers 105 hp at 4,400 rpm and accelerates from 0-100 km/h (0-62 mph) in 11.7 seconds, top speed is 194 km/h (120 mph). Average fuel consumption is just 4.2 liters of diesel per 100 kilometers (56.00 US mpg), and 109 grams of CO2 per kilometer (175.42 g/mile).

The A3 1.4 TFSI four-cylinder gasoline engine delivers 125 hpand accelerates from 0-100 km/h (0-62 mph) in 9.3 seconds and tops out at 203 km/h (126 mph). Average fuel consumption is just 5.3 liters (44.38 US mpg), and 124 grams of CO2 per kilometer (199.56 g/mile).

Additionally, both A3s are equipped with an on-board energy-recovery system, which "intelligently controls the alternator to recover energy" during braking and coasting. The energy is temporarily stored in the battery, and then fed back into the electrical system during acceleration--thus reducing the load on the alternator.

Sales will start this November. Prices for the 3-door 1.4 TFSI start at €23,700 and €24,600 for the 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.