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Autoblog gets ready for Le Mans with an R8 road trip and Allan McNish

This car is the master link between what Audi does on the race track and sells on the road.
We're attending the 24 Hours of Le Mans with Audi and we figured we'd make the world's biggest endurance race even more interesting by driving from Munich to Le Mans in an R8. We've also had a brief chat with Audi driver Allan McNish, and if you haven't already, check out all the multimedia ways to enjoy the next four days from the Circuit de la Sarthe, then read on.

Recharge Wrap-up: Ferrock a carbon-negative cement substitute, Audi makes e-diesel

A cement alternative uses recycled materials and traps CO2 rather than producing it. Invented by David Stone at the University of Arizona, Ferrock uses recycled steel dust and glass to produce a substance stronger than conventional concrete. Cement has a high carbon footprint from the high heat needed to process the limestone. Ferrock needs no such heat, and it actually uses CO2 to harden, making it, as Stone calls it, a carbon-negative material. Learn more in the video above, see the transcript at PBS NewsHour and read more at Green Car Reports. Teslarati offers a detailed rundown of Tesla's new Valet Mode feature for the Model S. Part of the Firmware 6.2 update, Valet Mode allows the owner to disable certain performance features and block personal information when letting someone else drive the car. It limits the car's to speed to 70 miles per hour, and caps output at 80 kW. It can also disable mobile app access, Homelink, Bluetooth and wifi and the "Places" function, which stores addresses for you. The folks at Teslarati did find some shortcomings in the new feature, though. Read more at Teslarati. Audi has produced its first batch of e-diesel made from water and CO2. The fuel is made by reacting hydrogen from the water with CO2 to make long-chain hydrocarbon compounds called "blue crude." That can then be refined similarly to crude oil to make e-diesel, which is a fuel free from sulfur and aromatic hydrocarbons. That e-diesel can be used on its own, or mixed with fossil fuel diesel to power a vehicle. "In developing Audi e-diesel we are promoting another fuel based on CO2 that will allow long-distance mobility with virtually no impact on the climate," says Audi Head of Sustainable Product Development Reiner Mangold. Read more in the press release below. Fuel of the future: Research facility in Dresden produces first batch of Audi e-diesel - The verdict: Pilot plant produces high-quality diesel fuel - No need for mineral oil: e-diesel made from water, CO2 and green power - Minister Wanka: "Synthetic diesel using CO2 is a huge success" Audi has taken another big step in the development of new, CO2 neutral fuels: A pilot plant in Dresden has started production of the synthetic fuel Audi e diesel. After a commissioning phase of just four months, the research facility in Dresden started producing its first batches of high-quality diesel fuel a few days ago. To demonstrate its suitability for everyday use, Federal Minister of Education and Research Prof.

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: