史上最强2.0T：奥迪S3装备全新2.0TFSI发动机

  奥迪在巴黎车展前发布了全新的S3，其中最大的亮点莫过于S3装备的全新2.0TFSI缸内直喷4缸发动机，无论是221kW的功率还是380Nm的扭矩均创造了同级别之最。这使得全新S3的0~100km/h加速时间仅用时5.1s，比上一代足足减少了0.7s。

  这款发动机相比于之前采用的2.0TFSI来说，虽然1984ml的排量以及气缸尺寸未变，但是几乎可以说是完全重新设计的产品。这款强劲的4缸发动机装备有两根平衡轴以曲轴转速两倍的速度旋转，确保了一流的平顺性。气门升程可以两级调节，此外还有可无级调节气门正时的装置，进气门调节范围有30°，排气门则有60°。
  此外，这款发动机的独特设计还有将排气歧管集成在了气缸盖上，这样做既可以降低排气的温度，还可以提升进气的温度，以提高发动机在尚未达到工作温度时的效率。全新的涡轮增压器将进气压力提升至1.2bar，奥迪同时也对中冷装置进行了升级。
  在全新发动机热管理系统的帮助下，润滑油可以在启动后很短的时间内就达到工作温度，并且可以维持在85℃至107℃之间，确保发动机时刻保持最佳工作状态。
  奥迪对发动机的主要部件也进行了强化处理，从活塞螺栓到连接轴均进行了强化，铸铁发动机缸体在主轴承座以及轴承盖处均做了强化处理。至于缸盖则采用了全新的硅铝合金材料，确保了一流的强度和高温性能。在活塞表面奥迪则采用了创新的涂层，使得内部摩擦得到了进一步的降低。
  在一系列创新工程的基础之上，这款全新的发动机自重仅148kg，比上一代足足减少了5kg，使得这款全新发动机在具备一流性能的基础上还有一流的燃油效率和节油潜力。

The brand-new engine on the brand-new S3

The long-stroke 2.0 TFSI in the Audi S3 has been developed from scratch. The only thing it has in common with its predecessor, which was named Engine of the Year five times in a row between 2005 and 2009, is its displacement of 1,984 cc (bore x stroke 82.5 x 92.8 millimeters). The four-cylinder unit delivers a constant 380 Nm of torque to the crankshaft between 1,800 and 5,500 rpm. Rated power at 5,500 rpm is 221 kW , and the engine redlines at 6,800 rpm.

The S3 delivers impressive performance. The sprint from zero to 100 km/h is completed in 5.1 seconds when equipped with the S tronic (5.4 seconds with the manual transmission). The electronically governed top speed of 250 km/h (155.34 mph) is just a formality. The S3 with S tronic consumes on average just 6.9 liters of fuel per 100 km (manual: 7.0 liters). This corresponds to CO2 emissions 159 (162) grams per kilometer and for models equipped with the manual transmission, an improvement of 1.5 liters compared with the previous version.

The powerful four-cylinder engine features two balance shafts rotating at twice the speed of the crankshaft for tremendous smoothness. The sound is emotion-inspiring and sporty. An electromechanical sound actuator at the bulkhead brings the engine sound to life in the cabin. The exhaust system also includes a sound flap that opens at certain engine speed ranges to give the S3 a sportily sonorous sound.

The 2.0 TFSI boasts groundbreaking solutions in many fields of technology. One of these is the additional use of indirect injection. It supplements the FSI gasoline direct injection at part load to reduce consumption and particulate emissions. FSI injection, which works at pressures up to 200 bar, is used when starting and at higher loads.

The developers achieved new degrees of freedom when it comes to filling the combustion chambers. On the exhaust side, the Audi valvelift system varies the stroke of the valves in two stages; the camshaft on the intake side can be adjusted steplessly through 30 degrees of crankshaft angle while 60 degrees of adjustment is available on the exhaust side. The compression ratio of 9.3:1 is unusually high for a turbocharged engine.

The exhaust manifold is integrated into the cylinder head, where it is bathed in coolant. This solution lowers the temperature of the exhaust and accelerates warmup following a cold start, which lowers consumption during the cold-start phase. This concept also has a positive effect on fuel consumption during sporty driving because full-load enrichment is no longer necessary. The large turbocharger is also a new development. It achieves a maximum boost pressure of up to 1.2 bar for even more spontaneous engine response. A high-performance intercooler integrated into the water circuit greatly reduces the temperature of the compressed air and thus increases the amount of air required for combustion.

With the 2.0 TFSI’s innovative thermal management system, two rotary slide valves consolidated in a single module regulate the flow of coolant. These valves ensure that the engine oil heats up to its operating temperature soon after the vehicle is started; they also maintain the coolant temperature, as per a given driving situation, between 85 and 107 degrees Celsius (185.0° F and 224.6° F). As a result – regardless of load or engine speed – the valves always strike the perfect balance between minimal friction and high thermodynamic efficiency.

The 2.0 TFSI has been designed specifically for use in the new Audi S3. Pistons with stronger bolts and new rings plus reinforced connecting rods with new mounts transfer the power to the crankshaft. The gray cast iron crankcase has been reinforced at the main bearing seats and the main bearing cover.

The cylinder head is made of a new, particularly lightweight aluminum-silicon alloy characterized by high strength and temperature resistance.