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Audi builds 5-millionth vehicle with Quattro

Quattro, the trademark name Audi has put on its all-wheel-drive system engineered for passenger vehicles, recently celebrated its five-millionth installation. The driveline has been offered in more than 140 different vehicles since its introduction more than three decades ago.
The all-wheel-drive technology made its world debut at the 1980 International Geneva Motor Show, beneath the floorpan of the Quattro Coupé, a low-volume two-door. It didn't take consumers long to embrace Audi's innovative approach. While most four-wheel-drive systems at that time utilized heavy transfer cases or second cardan shafts, Quattro was virtually tension-free, light, compact and efficient. Most importantly, enthusiasts found it was especially suitable for sports cars.
Today, the automaker offers Quattro on its full line of passenger vehicles and it is unquestionably successful (the technology enjoyed a 43 percent take rate in 2012). On models with transverse-mounted engines (A3 and TT), Audi uses an electronically controlled multi-plate clutch with hydraulic actuator. Under normal conditions, the clutch sends power almost exclusively to the front wheels (if wheel slippage occurs, up to 100 percent of the torque may be sent to the rear). Vehicles with transverse-mounted engines (A4, A5, Q5, etc...) use a self-locking center differential sending 40 percent of the engine torque to the front axle and 60 percent to the rear under normal conditions (it is able to send the majority of the power to the axle with better traction when needed). The highest-performing Quattro systems use torque vectoring to further improve cornering grip and speeds.

Audi spotted testing new S4 at the Nurburgring

Where there's smoke, there's fire. Only in this case, the smoke is the upcoming new Audi A4, and the fire is the S4 spotted undergoing testing in this latest batch of spy shots. Snapped in both sedan and Avant wagon forms while undergoing testing on and around the Nurburgring – where else? – the next-generation Audi S4 will of course be based on the new A4 that's anticipated to debut in Frankfurt this September. That means MLB Evo architecture and styling that takes a page out of the new TT's playbook. But in S4 trim, it'll be altogether more performance oriented. Expect an even more powerful version of the outgoing model's 3.0-liter supercharged V6, pumping out a good 340-350 horsepower to all four of its driven wheels. That power will help it keep pace with the new Mercedes C450 AMG Sport. It won't have to take on the new C63 AMG directly, though, as that'll be the job of the next RS4 that will slot above it. But since that model may never make it to US showrooms, this will stand as the flagship of the new A4 family as far as the American market is concerned. Related Video:

2017 Audi S4 goes running naked through the Alps

Audi just launched its new A4 sedan barely more than two months ago, bringing with it a raft of improvements over the outgoing model. And you know what that means: A new S4 performance model is just around the corner. Fortunately, that's just what we have here in these latest spy shots, snapped completely undisguised. Spotted testing in the Alps, the new Audi S4 is closely based on the new A4 we've already seen, benefiting from all its enhancements and weight savings. Only it promises to be more potent. Where previous S4s packed V8 engines and the current (outgoing) model pressed a supercharged V6 into service, this new model is tipped to switch to a fresh turbocharged V6. Expect power to rise from 329 horsepower up to 340 or more, and with less weight to motivate, we can expect performance to improve markedly in the process. Along with a more powerful engine, the S4 clearly stands out visually from ordinary A4s with bigger intakes, upgraded rolling stock, quadruple exhausts, and more. We'll have to wait a little longer to find out all the sordid details, but from the look of it, we won't have to wait long. In fact, we'd be surprised if Ingolstadt didn't take the opportunity to unveil it at the Frankfurt Motor Show this month, so watch this space for more and scope out the photos in the gallery above in the meantime.