In 1999, Audi expanded the range with the introduction of more powerful versions: a 1.8 Turbo rated 180 PS (132 kW; 178 hp), and a 1.9 TDI diesel engine with Unit Injector "Pumpe Düse" (PD) technology and variable geometry turbocharger. The four-wheel-drive A3 1.8T quattro used either the 150 PS (110 kW; 148 hp) or 180 PS (130 kW; 180 hp) engine
In late 2000, the A3 range was revised with new headlights and rear light clusters, other minor cosmetic changes, an improved interior, and the introduction of a six-speed manual gearbox, on the 180 PS (132 kW; 178 hp) 1.8 Turbo and the brand new 130 PS (96 kW; 128 hp) 1.9 TDI.
In mid 2003, the line was updated with two sports-orientated models, a 2.0 Turbo-FSI version rated 200 PS (147 kW; 197 hp), and a 3.2 VR6 engine (for the first time) with 250 PS (184 kW; 247 hp). Haldex Traction-based quattro on-demand four wheel drive, and the S-Tronic semi-auto gearbox were introduced as options (quattro is standard on the VR6) on every model with engine over 140 PS (103 kW; 138 hp).
In June 2009, Audi announced the release of two models of A3 1.6 TDI for European market. The first uses Audi's start/stop and energy recovery system, and will produce 105 PS (77 kW; 104 hp). This engine will achieve approximately 4.1 L/100 km (69 mpg; 57 mpg).The second engine does not use the same efficiency systems and will produce 90 PS (66 kW; 89 hp) will get 4.5 L/100 km (63 mpg; 52 mpg). They went on sale in June 2009.
In August 2009, Audi announced that the 1.6 8-valve petrol engine would be replaced by a turbocharged 1.2 TFSI engine already found in VW's Polo and Golf models. This engine is rated at 105 PS (77 kW; 104 hp) and 175 N·m (129 lb·ft), emitting 127 g/km of CO2. As of April 2010, Audi has yet to release official specifications or prices for the 1.2 TSI model, as the 1.6 model has been made a special clearance model for clearing out 1.6 stock.
The inline four 20v 1.8 L turbocharged petrol engine comes in two versions of power output: 210 PS (154 kW; 207 hp) and 225 PS (165 kW; 222 hp). Early models (1999–2001) had 210 PS (154 kW; 207 hp) which is said to be a de-tuned Audi TT engine, and was said to be reduced to lessen brand competition with the more powerful TT. Later models (2001–2003) had variable valve timing and 225 PS (165 kW; 222 hp). The engine provides a maximum 280 N·m (210 ft·lbf) of torque, most of which is available from 2200 through to 5500 rpm. This is the first time a small four-cylinder engine has been used in an Audi S-series car.
In the United Kingdom, the S3 is priced notably higher than many of its rivals. BMW's 130i M Sport offers 265 bhp (198 kW; 269 PS), but is slower to 100 km/h (62 mph) at 6.0 seconds. Other cars of similar power are a good deal cheaper; the Volkswagen Golf Mk5 R32 sports 184 kW (250 PS; 247 bhp), with 0–100 km/h (0–62 mph) achieved in 6.2 seconds. The Vauxhall Astra VXR comes with less power - 240 bhp (179 kW; 243 PS) - but manages 0–100 kilometres per hour (0–62 mph) in 6.5 seconds, whilst the SEAT León Cupra (2.0 T-FSI with 177 kW (241 PS; 237 bhp)), Volvo C30 (225 bhp (168 kW; 228 PS) 2.5-litre inline-5 turbo), and Mazdaspeed3 (2.3-litre turbocharged engine with 263 bhp (196 kW; 267 PS)) also provide competition. Only the S3 and R32 are four-wheel drive, however, though the 130i M Sport is rear-wheel drive.
The engine in the concept car is a turbocharged 2.0 litre diesel producing 224 horsepower (167 kW) and 332 ft·lbf (450 N·m). of torque. It produces 113.8 horsepower (84.9 kW) per litre while meeting Euro 5 Diesel emission standards. It uses the quattro drive system with a six-speed manual transmission.
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