Essentially, Audi has taken a built 3.0-liter version of its direct-injection V-6 and fastened an Eaton four-vane, roots-style supercharger on top. The setup is good for 333 hp and 324 lb-ft from a wide 2900 to 5300 rpm. That’s 11 horsepower down from the old V-8 S4, but the power curve tells the story: Torque is up by 12 lb-ft over more revs, dropping the car’s official zero-to-62 figure by half a second, to 5.1.
No surprise, this engine is more fuel-efficient than its predecessor. Audi touts 27 percent less consumption and off-the-record early estimates at EPA figures puts the car at 17 mpg city and 26 mpg highway for six-speed manual models, while and 17 mpg city and 27 mpg highway is the unofficial figure for cars fitted with Audi’s new seven-speed S-tronic.
Those are the two transmission choices: a six-speed manual and Audi’s new seven-speed S-tronic — their name for a dual-clutch transmission. Audi says the outgoing S4 sold in a 50:50 ratio of manuals to automatics, though they expect that to change to 40:60 in favor of S-tronic due to its technical superiority — faster shifts, better fuel economy, and equal acceleration performance to the stick.
All of it sounds good so far, but it’ll still need more of a hooligan factor to win over the aging Evo guys. That’s where Audi’s new rear sport differential comes in. The main function of the sport differential is to send power to the outer rear wheel in a turn to help stabilize — and even throttle-steer — the car.
Source: Motive Magazine