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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.

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:

Audi readies sales of new fuel-efficient A4, A5 and A6 models

As diesels continue to account for a minority of cars sold by Audi in the US, the German automaker and Volkswagen unit continues to expand its diesel models in Europe for the sake of fuel efficiency. Early this year, Audi will debut its new A4, A5 and A6 variants in Europe as part of what it calls its "ultra" strategy of pairing performance with fuel economy. Audi will have 11 new models for 2014, and the updated A4, A5 and A6 will use Audi's 2.0-liter turbodiesel powertrain. Versions of that engine will range from 136 to 190 horsepower, while torque will range from 236 to 295 pound-feet. More importantly, the models will get anywhere from 51 to 60 miles per gallon, when tested on the more lenient European driving cycle. And while manual transmission will be standard (this is Europe, after all), the A6 will have a seven-speed automatic transmission option. Pricing will start at 32,600 euros ($44,000 US) for the base A4 and work its way up to 45,000 euros (about $61,000) for the top of the line A6. Last year, Audi boosted its diesel sales in the US by 40 percent to just over 10,000 units, though that accounted for just a fraction of the approximately 158,000 cars the company sold domestically in 2013. Audi has a press release on the new models below. The new ultra models from Audi A4, A5 and A6 with impressive efficiency • New ultra models from Audi with 136 hp, 163 hp and 190 hp • Greater efficiency with unchanged driving dynamics • Emissions of just 104 to 119 grams of CO2 per kilometer (167.37 to 191.51 g/mile) Audi A6 2.0 TDI ultra, Audi A5 2.0 TDI ultra, Audi A3 1.6 TDI ultra Audi is expanding its ultra strategy with 11 new models: Especially efficient engine versions in the A4, A5 and A6 model lines will be launched in early 2014. A new and powerful two-liter TDI will provide the drive at 100 kW (136 hp), 120 kW (163 hp) or 140 kW (190 hp); the engine emits just 104 to 119 grams of CO2 per kilometer (167.37 to 191.51 g/mile) depending on the model. The "ultra" designation stands for sustainable mobility that is fully available for everyday use. With a combined fuel consumption rate of 3.9 to 4.6 liters per 100 kilometers (60.31 to 51.13 US mpg) and CO2 emissions of 104 to 119 grams per kilometer (167.37 to 191.51 g/mile), the new ultra models from Audi are among the most efficient cars of their segment – without any limitation on the driving dynamics or customary comfort. Audi Board Member for Development, Prof. Dr.