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The New Audi S4/S4 Avant

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The New Audi S4/S4 Avant

Post by LhYnxz on Mon Sep 22, 2008 6:55 pm



The New Audi S4/S4 Avant


Source: Audi AG

  • Three-liter V6 unit generates 245 kW (333 hp)
  • Acceleration from 0 to 100 km/h in 5.1 seconds
  • Average fuel consumption of just 9.7 liters

    Ingolstadt - Audi is introducing its new sporty top models in the
    midsize class - the S4 and the 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 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 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 S4 and 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.


    Dynamism and efficiency: The new seven-speed S tronic

    The V6 power in the new S4 and 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.
    Both transmission structures are continuously active, but only
    one is powered at a time by the engine. For example, when the driver
    accelerates in third gear, the fourth gear is already engaged in the
    second transmission structure. The shifting process takes place as the
    clutch changes – K1 opens and K2 closes with lightning speed. This
    process takes only a few hundredths of a second and is completed
    without interrupting traction. It is so comfortable and smooth that the
    driver hardly notices it.
    The seven-speed S tronic is designed for maximum efficiency. It
    operates with very high efficiency and its intelligent control system
    maximizes fuel economy in automatic mode. With its wide gear ratio
    spread of 8.0:1 the seven-speed S tronic easily exploits the tremendous
    power and superior torque of the 3.0 TFSI.
    The quattro permanent all-wheel drive system transfers power to
    the road with supreme ease. Under regular driving conditions, it sends
    40 percent of its torque to the front wheels and 60 percent to the rear
    wheels – a slightly rear-biased, sporty characteristic. Where
    necessary, it can vary distribution within fractions of a second.
    The quattro drive system ensures safe self-steering
    characteristics, high stability and excellent traction in comparison
    with rear-wheel-drive competitors.


    Customized torque distribution: The sport differential with Audi drive select

    The new, active sport differential ideally complements the
    quattro drive system and lends it even greater fascination. When the
    steering wheel is turned or the car accelerated in a corner, power is
    redirected in a controlled manner to the outer rear wheel, literally
    pushing the vehicle through the corner. The system intervenes to
    counter any signs of understeer or oversteer. For the driver, this
    means reduced effort at the steering wheel and even higher lateral
    acceleration.
    The active sport differential is a new type of rear-axle
    differential. A superposition gear was added to both the left and right
    sides of the classic differential; it rotates ten percent faster than
    the wheel's drive shaft.
    Both components can be connected through a multidisk clutch,
    which runs in an oil bath, and is operated by an electro-hydraulic
    actuator. In most driving situations, the clutch can divert almost the
    complete input torque to one wheel in this way.
    Controlled by an array of sensors and a high-speed computer,
    the active sport differential needs less than 100 milliseconds to
    redirect power. Drivers can adapt their manner of driving, along with
    characteristics for the load changes, to three performance maps. Unlike
    competitors' systems, the Audi sport differential is just as effective
    when the engine is driving the wheels as it is on the overrun or when
    the car is coasting freely.
    The new Audi S4 and S4 Avant are well-trained athletes. Their
    five-link front axle and the self-tracking trapezoidal-link rear axle
    are of a highly sophisticated design; both axles are made almost
    entirely of aluminum and are therefore very lightweight. The
    low-mounted steering gear transmits the steering forces to the wheels
    without any lag time and gives the driver a precise and sensitive road
    feel.
    The spontaneity of Audi's new midsize athletes is fascinating,
    and they possess the precise reactions of a thoroughbred sports car. In
    these transmissions, the differential is positioned in front of the
    clutch, which made it possible to move the engine 154 mm (6.06 in)
    forwards compared with the predecessor model. This unusual layout
    perfectly evens out the axle loads, and also affords the long wheelbase
    of 2,811 mm (9.22 ft) exceptional stability.
    The chassis of both new S models received stiffer axle
    bearings, and the sporty tuning with stiff shock absorbers puts the
    chassis 20 mm (0.79 in) closer to the road. Huge high-performance and
    fade-resistant brakes sit behind the 18-inch and optional 19-inch cast
    aluminum wheels. The black-painted brake calipers – at the front with
    the S4 logo – grip the ventilated disks with newly developed brake
    pads.

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