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Watch VW Group Night kick off the Frankfurt festivities

The Frankfurt Motor Show is Volkswagen's home affair. As a result, the whole of the automaker group makes a big splash, even before the show doors open. We'll be live from the Frankfurt floor starting early tomorrow morning, but tonight we're posted up in the stands at the always-entertaining Volkswagen Group Night. To give you a taste of what it's like to be there, we're going to be shooting some man-on-the-scenes video as the night progresses. Below you'll find videos of all the best that VW Group brands – Audi, Lamborghini, VW, the lot – have to offer, as quick as we can upload them. So, enjoy the Short Cut Videos you see here. And stay tuned as we add more to the tally, below. And, of course, be sure to check in on Autoblog early and often tomorrow, when we bring you official debuts of new production vehicles and concept cars, a ton of new video content, live image galleries, and lots more.Seat Leon Cross Sport Bentley Bentayga Lamborghini Huracan LP 610-4 Spyder Volkswagen Multivan PanAmerican Edition Bugatti Vision Gran Turismo Concept Audi E-Tron Quattro Concept Audi A4 Ducati Monster 1200 R Volkswagen Tiguan Skoda Superb Combi Porsche 911 Carrera S Coupe and Cabrio Volkswagen Tiguan GTE Porsche Mission E Concept Volkswagen Group Night Finale Green Frankfurt Motor Show Audi Bentley Bugatti Lamborghini Volkswagen SEAT Skoda Videos Original Video Frankfurt 2015

2017 Audi RS5 DTM racer is a smorgasbord of carbon-fiber wings

Along with the reveal of the new RS5 coupe, Audi took the wraps off its corresponding DTM racer here at the Geneva Motor Show. This concurrent debut strategy is completely by design. "For the first time, we developed a new DTM car in parallel with the production model. This underlines once again how closely motorsport and production work together at Audi," said head of Audi Motorsport Dieter Gass. As much as Audi would like you to believe its DTM racer shares a lot in common with its production RS5 ... well, it doesn't. Gone is the new biturbo V6, and in its place is a 4.0-liter V8. It's not a Quattro – all DTM racers are rear-wheel drive – and the chassis is a carbon-fiber monocoque. And, of course, there is an extremely complex set of wings, vanes, and splitters that you'd never see on a production car. View 15 Photos Interestingly, the 2017 DTM regulations actually reduce the total amount of downforce allowed. That ought to mean slower cars, but Audi promises the opposite is true, due to sticky new tires and a 4.0-liter V8 engine tuned to deliver "more than 500 horsepower." That's more than last year, thanks to changes made to the air intake and cooling systems. Audi won the Constructor title in DTM last year with the old RS5 racer, so the pressure is on to follow that feat again in 2017. We'll find out soon enough how good the new car is – the 2017 DTM season starts on May 6 in Hockenheim. Related Video:

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.