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Don't hold your breath for an Audi RS8

There was a time not so long ago when Quattro GmbH produced essentially one model at a time. But that time is behind us. These days it's expanding into a full-fledged performance division to rival Mercedes-AMG and BMW's M department. Quattro GmbH is currently building the Audi RS4 Avant, RS5 coupe and cabrio, RS6 Avant, RS7, RS Q3 and the TT RS coupe and roadster - not to mention the R8. And while it's showing no signs of slowing down, but the latest intel from across the pond suggests we shouldn't count on an RS version of Audi's flagship sedan.
This according to Car and Driver, which spoke to Stephan Reil, the chief engineer at Quattro GmbH. Reil says Audi works on a teutonically rigid performance formula: an RS model has to have 20 to 25 percent more power than the existing S version. Considering that the existing S8 makes 512 horsepower and the RS7 a solid 553, we're not sure Audi really needs anything more powerful. But by Reil's calculations, the RS8 would need to pack between 630 and 655 hp, which would put it well ahead of rivals like the 550-hp Jaguar XJR, the 540-hp BMW Alpina B7, the 523-hp Maserati Quattroporte and even the new 577-hp Mercedes-Benz S63 AMG - and in league only with the even more powerful S65 AMG, which in its outgoing form produced 630 hp.
The question then comes down to whether there are enough customers lining up for the S65 that Audi would want to poach away from Mercedes. Or perhaps more pertinently, whether it might end up just taking customers from the new Bentley Flying Spur, which is already offering 616 horsepower in an even more prestigious, if less performance-focused package. Either way you look at it, Audi is apparently steering clear.

Audi is working on a suspension that gets power from bumpy roads

Regenerative brakes aren't new. They're on virtually every hybrid and EV, and they're even starting to pop up on traditional gas-powered cars, like with the i-ELOOP-equipped Mazda6. But even with these systems, cars can get more efficient, and Audi thinks it found yet another source of wasted energy. The source? The suspension. The idea is to turn the kinetic energy that goes into the dampers into usable energy instead of as waste heat. Audi isn't the first auto company to come up with regenerative suspension – nearly three years ago, ZF introduced its GenShock technology, which used a valve attached to traditional, oil-filled hydraulic shocks to recapture kinetic energy from movement caused by bumps in the road. Audi's prototype technology, which it calls eROT, replaces traditional dampers with horizontally oriented electromechanical rotary dampers. eROT is apparently short for electromechanical rotary damper. Neat. In testing, eROT recovered an average of 100 to 150 watts on a typical German road, three watts from a fresh piece of pavement, and 613 watts on a rough stretch of tarmac (wattage is calculated as power over time, so this is actually the rate at which the system harvests energy). The dampers channel that energy to a tiny, 0.5-kWh, 48-volt battery. The prototype is claimed to cut CO2 emissions by three grams per kilometer (4.8 grams per mile), while the company believes a future production version could save up to 0.7 liters of fuel per 100 kilometers of driving. Converting the savings to American miles per gallon isn't easy, so we'll use a practical example. In the US, the Q7's supercharged 3.0-liter V6 returns a combined rating of 21 miles per gallon, which works out to 11.2 liters per 100 kilometers. Apply eROT's 0.7L/100km savings, and the Q7's economy would improve to 10.5L/100km, or 22.4 mpg, a 1.4-mpg improvement. That's not huge, but because math, 0.7L/100km is more dramatic on a more fuel efficient vehicle – taking an A3's 27-mpg combined rating and adding eROT would drive efficiency up 2.4 mpg, for example. There are a few other big benefits beyond fuel and emissions savings – Audi claims eROT provides a more comfortable ride than traditional active suspensions, because engineers can tune the compression and rebound strokes independently of each other. Beyond that, the horizontally oriented rear suspension geometry means more cargo space, since the dampers don't poke up into the cabin like they normally do.

Stanford goes from Pikes Peak to Thunderhill with autonomous Audi TTS

In the years since Stanford University engineers successfully programmed an Audi TTS to autonomously ascend Pikes Peak, the technology behind driverless cars has progressed leaps and bounds. Back then the Audi needed 27 minutes to make it up the 12.42-mile course – about 10 minutes slower than a human driver. These days, further improvements allow the vehicle to lap a track faster than a human. The researchers recently took their autonomous TTS named Shelley to the undulating Thunderhill Raceway Park, and let it go on track without anyone inside. The Audi reportedly hit over 120 miles per hour, and according to The Telegraph, the circuit's CEO, who's also an amateur racing driver, took some laps as well and was 0.4 seconds slower than the computer. To make these massive technological advancements, the Stanford engineers have been studying how racers handle a car. They also hooked up drivers' brains to electrodes and found the mind wasn't doing as much cognitively as expected. It instead operated largely on muscle memory. "So by looking at race car drivers we are actually looking at the same mathematical problem that we use for safety on the highways. We've got the point of being fairly comparable to an expert driver in terms of our ability to drive around the track," Professor Chris Gerdes, director of Stanford's Revs Program, said to The Telegraph. With progress coming so rapidly, it seems possible for autonomous racecars to best even elite drivers at some point in the near future. Related Video: