2009 Audi S4 Avant makes its debut

Article by Christian Andrei, on September 14, 2008

A lot of fanfare greeted Audi when it presented the Audi S4 and the Audi S4 Avant – its sporty top models in the midsize class – back in 2008. Audi equipped these vehicles with a three-liter V6 engine with direct fuel injection and mechanical turbocharging, generating an impressive 245 kW (333 hp). With this engine, the Audi S4 was capable of going from zero to 100 km/h (62.14 mph) in only 5.1 seconds.

It uses just 9.7 liters of fuel per 100 km (24.25 US mpg) on average. It is equipped with a quattro permanent all-wheel drive system. Power is then converted by the sport suspension into dynamic handling. Audi accepted requests from its customers for the new Audi S4 and S4 Avant with regards to innovative technologies that made the vehicles superior over its rivals. Changing the gears on the seven-speed S tronic is accomplished with lightning speed.

In addition, the new sport differential is capable of distributing the torque when necessary between the rear wheels. The unveiling of the Audi S4 will be made on October 2 at the Paris Auto Show.

A totally redesigned engine was used on this Audi S4 and Audi S4 Avant. The 3.0 TFSI, a part of the Audi V-engine family, was cited as an exceptional case of how the brand can combine efficiency and performance.

The V6 can produce power from a displacement of 2,995 cc and generates 245 kW (333 hp) with the aid of a supercharger. The sedan can accelerate from zero to 100 km/h (62.14 mph) in only 5.1 seconds. Meanwhile, the Avant can make the sprint in 5.2 seconds. Both can achieve an electronically limited top speed of 250 km/h (155.34 mph).

No longer does the “T” 3.0's TFSI nomenclature stand for “turbo.” It actually refers generally to the concept of supercharging. Mechanical charging was able to prove its superiority after comprehensive tests were conducted on the big V6. With direct injection, it was deemed to be better than the twin turbochargers when it comes to packaging, responsiveness, and starting performance.

This represents an improvement of 3.4 liters (26%) compared with its predecessor. Its fuel efficiency is credited to Audi’s gasoline direct injection technology. It’s different from traditional concepts as it allows the compressor to be positioned behind the throttle valve. Considering the low density of the intake air at loads below supercharging level and during coasting, its rotors are free-running and only require a very low level of power to drive them.

The V6 power in the new Audi S4 and Audi S4 Avant then flows into a six-speed transmission, offered as standard. Shifting is quick and precise. Audi also offers the option of a technologically advanced dual-clutch transmission. The seven-speed S tronic is known to be very dynamic and highly efficient. 

Furthermore, the driver can either choose to be in fully automatic mode or choose the gears with paddles on the steering wheel or directly with the shift lever. All of these choices offer very quick gearshifts. The gearshift is typical of Audi as it is precise, dynamic, and comfortable. The seven-speed S tronic is composed of two separate transmissions and makes use of two multidisk clutches that control the different gears.

The big K1 clutch guides the power through a solid shaft to the pinions for gears 1, 3, 5 and 7. A hollow shaft then rotates around the solid shaft. It is linked to the compact K2 clutch, which is built within its bigger counterpart and controls the pinions for gears 2, 4, 6 and reverse gear.

Powertrain

The compact compressor can very easily fit in the 90-degree V of the cylinder banks rather than the intake manifold. A couple of four-vane rotary pistons counter-rotate inside the
turbocharger at as much as 23,000 rpm. In its housing are two charge-air coolers that are linked to a separate coolant circuit. The noise produced by the compressor is kept to a minimum with its
numerous modifications. Full thrust right from idling speed is made possible by the engine-driven belt that powers the mechanical charger.

Meanwhile, the 3.0 TFSI generates a maximum 440 Nm (324.53 lb-ft) at 2,500 rpm and sustains this until 4,850 rpm.

When in fourth gear, the vehicle is capable of sprinting from 80 to 120 km/h (49.71 to 74.56 mph) in only 4.4 seconds. Because of the very short gas paths, the supercharged V6 immediately reacts to the throttle, even more so than a naturally aspirated engine that has the same displacement.

In addition, the new 3.0 TFSI is very frugal when it comes to fuel. The sedan uses an average of 9.7 liters of fuel per 100 km (24.25 US mpg) while the Avant 9.9 liters per 100 km (23.76 US mpg).

Press Release

Audi S4 Avant (2009)

Audi has introduced its new sporty top models in the midsize class - the Audi S4 and the Audi S4 Avant. Their engine, a three-liter V6 with direct fuel injection and mechanical turbocharging, delivers a powerful 245 kW (333 hp). It accelerates the Audi S4 to 100 km/h (62.14 mph) in just 5.1 seconds, but on average only uses 9.7 liters of fuel per 100 km (24.25 US mpg). The quattro permanent all-wheel drive system transfers its power to the road in style, which is then converted by the sport suspension into dynamic handling.

Upon request, Audi can equip the new Audi S4 and S4 Avant with innovative technologies that further increase their lead over the competition. The seven-speed S tronic changes gears with lightning speed, and the new sport differential distributes the torque as needed between the rear wheels. The new Audi S4 will be unveiled to the public for the first time at the Paris Auto Show from October 2 to 19.

The heart of the new Audi S4 and Audi S4 Avant is a completely redesigned engine. The 3.0 TFSI, the newest member of the Audi V-engine family, is an outstanding example of how the brand with the four rings blends performance and efficiency. The V6 generates its power from a displacement of 2,995 cc, is equipped with a supercharger, and delivers 245 kW (333 hp). The sedan sprints to100 km/h (62.14 mph) in just 5.1 seconds, and the Avant in 5.2 seconds: they both have an electronically governed top speed of 250 km/h (155.34 mph).

The "T" in the 3.0's TFSI nomenclature no longer merely stands for "turbo", but rather for the concept of supercharging in general - extensive testing on the big V6 has proven the superiority of mechanical charging. In conjunction with direct injection it is far superior to twin turbochargers, both in terms of packaging and of starting performance and responsiveness.The compressor is so compact that it easily fits inside the 90-degree V of the cylinder banks, in place of the intake manifold.

Two four-vane rotary pistons counter-rotate inside the turbocharger at up to 23,000 rpm. Two charge-air coolers are integrated into the housing and are connected to a separate coolant circuit. An impressive array of measures keeps the noise generated by the compressor to a minimum.The engine-driven belt that powers the mechanical charger provides full thrust right from idling speed.

The 3.0 TFSI delivers its maximum 440 Nm (324.53 lb-ft) at 2,500 rpm and maintains this constantly until 4,850 rpm. In fourth gear, the vehicle accelerates from 80 to 120 km/h (49.71 to 74.56 mph) in just 4.4 seconds. Thanks to the extremely short gas paths, the sonorous, supercharged V6 responds spontaneously to the throttle, even more so than a naturally aspirated engine of the same displacement.

Furthermore, the new 3.0 TFSI achieves exemplary fuel efficiency. On average, the sedan uses 9.7 liters of fuel per 100 km (24.25 US mpg), and the Avant 9.9 liters per 100 km (23.76 US mpg) - an improvement of 3.4 liters (26 percent) compared with its predecessor. The Audi technology of gasoline direct injection was what made this great efficiency possible in the first place. Unlike conventional concepts, it allows the compressor to be located behind the throttle valve.

In view of the low density of the intake air at loads below supercharging level and when coasting, its rotors are free-running and the amount of power required to drive them is low.The V6 power in the new Audi S4 and Audi S4 Avant flows into a six-speed transmission, fitted as standard, which shifts quickly and precisely. As an option, Audi offers a state-of-the-art dual-clutch transmission - the seven-speed S tronic is extremely dynamic and highly efficient.

The driver has the option of driving in fully automatic mode or selecting the gears with paddles on the steering wheel or directly with the shift lever - all of which provide impressively quick gearshifts. The gearshift feel is dynamic, comfortable and very precise - typically Audi.The seven-speed S tronic consists of two separate transmissions and uses two multidisk clutches that control the various gears.

The large K1 clutch guides the power via a solid shaft to the pinions for gears 1, 3, 5 and 7. A hollow shaft rotates around the solid shaft; it is connected to the compact K2 clutch, which is integrated within its larger counterpart and controls the pinions for gears 2, 4, 6 and reverse gear

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