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2015 Rolex 24 at Daytona gallery of Saturday afternoon and night racing

The 2015 Rolex 24 at Daytona only has a little under five hours left to run and we won't write anything in here to spoil it. Instead, we're just going to leave you with a gallery of 169 photos from the Saturday afternoon and overnight action before we come back with a race recap. Enjoy! Featured Gallery 2015 Rolex 24 at Daytona mid-race action View 169 Photos Image Credit: Copyright 2015 Jonathon Ramsey / AOL Motorsports Audi Racing Vehicles daytona night race

Audi bringing all-electric CUV to Frankfurt

Audi will introduce a new, all-electric, MLB-based concept this September at the 2015 Frankfurt Motor Show. According to CEO Rupert Stadler, production of the vehicle this concept foreshadows will eventually hit 10,000 units. Stadler isn't the only Audi exec dropping details on the company's high-riding EV. Research and development boss Ulrich Hackenberg let slip that the all-electric "sports activity vehicle," might be followed by both a gas-powered plug-in variant and hydrogen-fuel-cell model. According to Hackenberg, the production model will arrive in early 2018, cover about 310 miles per charge, and target the upcoming Tesla Model X. Look for more on this new model and the concept that will precede it as the Frankfurt Motor Show approaches. 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.