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BMW M4 versus Audi RS5 | Autoblog Podcast #546

On this week's Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Reese Counts. We debate the merits of the BMW M4 and the new Audi RS5 and our hopes for the refreshed Mercedes-AMG C63. We also discuss the state of Cadillac, the future of the Ford Fusion and the rumored Mercedes-AMG competitor to the Porsche 718 Boxster and Cayman. Autoblog Podcast #546 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown 2018 BMW M4 versus 2018 Audi RS5 Cadillac and Mercedes-AMG sport coupes The state of the luxury car industry The future of the Ford Fusion Replacement for the Mercedes-Benz SLC Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: Design/Style Podcasts Audi BMW Cadillac Ford Lexus Lincoln Mercedes-Benz Convertible Coupe Crossover SUV Luxury Performance bmw m4 mercedes-amg c63

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 debuts all-new R18 E-Tron Quattro with novel secondary hybrid system

This is the new Audi R18. It looks like the Bond villain of race cars (it has red running lamps), and if Audi's past is any indication, it'll prove difficult to beat in the LMP1 class of the 2014 World Endurance Championship.
The car's full name is the Audi R18 E-Tron Quattro, just like last year's car. Also like last year's car, the new R18 draws its power from a V6 turbodiesel, which powers its rear wheels, and Audi's E-Tron hybrid system, which runs its front axle. Unlike last year's car, though, this R18 has a secondary hybrid system. Audi has fitted the V6 with an electric turbocharger and figured out how to capture waste heat generated when the engine reaches its boost limit. That power can then be stored and fed back into either the turbo or the front axle's hybrid system under acceleration.
There are a number of changes to the body on the new car, forced in large part by series regulation changes. The car is narrower, particularly at the front, but it's also taller. The front end is set off by a new wing, as part of a new WEC regulation. Audi seems quite pleased about this, citing an improvement in front-end downforce and a reduction in cost. Like Formula One, the WEC contenders now have to contend with a ban on the so-called blown diffuser, which forced exhaust gases over the diffuser, creating downforce. That's necessitated some changes from Audi, although as we have no rear shots of the car, we can't tell you what it looks like.