2009 Audi S4 | Sports Cars

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Year (of specifications)	2009
Engine	3.0 litre V6 supercharged
Transmission	7 speed S-Tronic DSG AWD
Max speed	155 mph (electronically limited)
0-60 mph	5.1 seconds
Horsepower	333 bhp
weight	-

The 2009 Audi S4 is powered by a 3.0 litre V6 with direct fuel injection and what Audi call "mechanical turbocharging" (supercharging). The compact compressor 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. The engine-driven belt that powers the mechanical charger provides full thrust right from idling speed.

Developing 333 horsepower and 324 lb-ft (440 Nm) of torque at 2,500 rpm, the engine is connected to either a standard six-speed manual gearbox, or an optional seven-speed, dual-clutch transmission which can be used either as a conventional automatic or as a sequential semi-auto with steering wheel mounted paddles.

The seven-speed S-tronic gearbox of the 2009 S4 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.

The quattro all-wheel-drive system sends power to all four wheels. A 40/60 percent front/rear torque bias ensures that the handling remains sporty yet stable. However, when necessary, the power distribution can be varied within fractions of a second.

The 2009 Audi S4 shares the same styling cues as the rest of the model lineup. Some of the most striking modifications to the exterior design are the special aprons, the aluminum-look exterior mirrors, the 18-inch S-design light-alloy wheels, the side rocker panels, the discreet rear spoiler and the quadruple exhaust system. The xenon plus headlights with daytime running lights and the rear lights are further distinctive touches.

Inside the 2009 Audi S4 are sports seats with electric lumbar supports and pull-out thigh supports. The instrument panel features gray dials with white needles, these bear the S4 emblems, as do the multifunction sport steering wheel and the key. The interior is in black, with brushed aluminum inlays. Carbon and birch wood inlays are also available, as are stainless steel mesh inlays.

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