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Next Audi RS4 to get an electric turbo?

We don't yet know if the next Audi RS4 will come to the US, but whoever gets it could find an electric turbocharger under the hood according to a report in Auto Express. The 4.2-liter V8 that has served for two RS4 generations is retiring from the line, replaced by a twin-turbocharged version of the supercharged 3.0-liter V6 used in the S4. But instead of using two sequential turbochargers - a smaller one to eliminate lag while a larger, more powerful turbo spools up - batteries charged by brake regeneration could power a first-stage electric turbo. The idea hasn't been publicly appointed for a particular model, as Audi's technical chief Ulrich Hackerberg has said that due to expense, that kind of setup "would only be used be used on the very top end models." Since the technology cuts down on the use of exhaust gases, it would also also help in markets like Europe where CO2 emissions are a factor. No matter whether it benefits from all conventional or some electric boost, the horsepower number for the twin-turbo V6 will be more than 420 hp but less than 503 hp, the rating of the V8-powered Mercedes-Benz C63 AMG. Auto Express believes Audi will want to maintain the power gap between the 333-hp S4 and previous, 444-hp RS4. With Hackenberg saying the new S4 will make more than 350 hp, that gets the coming RS4 up to at least 461, but AE figures it "could deliver as much as 480 hp." We'll find out sometime after the S4 launches next year.

2016 Audi R8 looks like a promising second chapter [w/video]

Audi shook up the supercar market when it released the original R8 road car. Now, it's hoping to do the same with the second-generation of the handsome mid-engine star. But where the original R8 was something of an analog supercar, boasting a naturally aspirated V8 and a delightful gated shifter, this new model is something much different. Gone is the popular, high-revving 4.2-liter V8 and the snickety-snack transmission, although the 5.2-liter V10 that joined the original R8 later in its life remains. In base form, it turns out 540 horsepower in the second-gen R8, while the V10 Plus model can be had with an impressive 610 ponies. That's good for a sprint to 60 of just 3.5 seconds and a top speed of 201 miles per hour in the former and 3.2 seconds and 205-mph in the latter. A seven-speed dual-clutch transmission is the sole gearbox, sending power to a revised Quattro all-wheel-drive system that's capable of shunting 100 percent of the engine's torque to the rear axle. Meanwhile, Audi has managed to shave 441 pounds by using a new Audi space frame, with more aluminum and carbon fiber than before. Weighing in at just 3,205 pounds, the R8 is slightly lighter than the new, V8-powered Ferrari 488 GTB, although it's not quite as light as its cousin, the 3,135-lb Lamborghini Huracan. And of course, we can't forget to mention the R8's new look. It's very clearly an evolution of the first-gen's handsome styling. A strong grille and canted headlights, inspired by the TT and the concepts that came before it, highlight the front end, while Audi has opted to bisect the last-gen car's side blades with a body-color section of sheet metal. In back, slim taillights, exhausts that have been integrated into the rear bumper and a central diffuser are the main styling features. Opt for the V10 Plus, and you'll get a sizable rear wing, for added downforce. Take a look at our full gallery of live images from Geneva for a closer look at the new Audi R8.

2017 Audi S4 First Drive

For all its power and easy performance, the best thing about the last Audi S4 was its uncanny ability to act like a normal (but very high-spec) A4 for most of its life. Then, when you needed or wanted a bit more speed or a bit more grip, you pushed a button or opened the tap and it became something else. It became a thing with more grip, more poise, more focus, and more gristle, but the changeover between the two S4 characters was seamless. That doesn't seem to be the case with the new one. The latest, B9 A4 has been well received and is probably the best mid-sized premium car out there, so that should have left the S4 a simple job to become the best warmed-up premium mid-sizer. It hasn't quite happened like that. The spec sheet suggests the S4 should come out on top in the fight with the BMW 340i and the Mercedes-AMG C43, but the numbers aren't everything. The engine seems impressive on paper; the all-new EA838 3.0-liter turbocharged V6 was jointly developed with Porsche (and it's closely related to Porsche's next V8, with which it will share non-internal bits like the camshaft chain). The 60-degree V6 weighs 31 pounds less than the old S4's supercharged V6, and it's replete with variable valve timing and lift, centrally mounted fuel injectors, and both direct and indirect fuel injection. That gives it 354 horsepower at 5400-6400 rpm (up 6.5 percent) and 369 pound-feet of torque from 1,370 to 4,500 rpm. That gives it a peak 44 lb-ft higher than the old one, spread across a band 600 revs broader. At 2,000 rpm, where drivers live every traffic light, it has another 74 pound-feet. That's enough motivation to move to 62 mph in 4.7 seconds. There's a new all-wheel-drive system that usually shoots 60 percent of the torque to the back but can ramp that up to 85 percent when it needs to, or it can swing it around to fire more than 70 percent to the front axle. The category benchmarks suggest turbocharged 3.0-liter gasoline sixes are the thing to have, with the Mercedes-AMG C43 using one, the 340i BMW having one (though it's straight), and Maserati's Ghibli also using one. The oddball is Jaguar's XE S, which uses a supercharger. You know, like Audi just ditched. The S4 trumps all but the C43 on power (the nine-speed Benz has 362 hp). While it ties the Ghibli for torque, it again trails the Benz (by 15 lb-ft) though its torque peak hits far earlier (the Benz waits until 2,000 rpm).