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Mattias Ekstr?m unleashes bonkers 600-hp Audi S1 Supercar on World RX

Mattias Ekström doesn't need to prove anything. He's won the DTM title twice and before that the Swedish Touring Car Championship. But being a racing driver as he is, Ekström has been looking for new challenges. He's contested the Swedish Rally six times, the German Rally twice, he's driven in V8 Supercars and in NASCAR. He's even won the Race of Champions. Twice. Heck, we're surprised his long-time sponsor Red Bull hasn't let him try out one of its F1 cars. But this season it's on to a new challenge: the inaugural FIA World Rallycross Championship.
Ekström drove a Volkswagen Polo fielded by Marklund Motorsport in the Swedish rallycross round last season and came in second, but this year he's diving in head-first with his own team and his own car. His outfit EKS is hard at work preparing the new Audi S1 for competition in the World RX Championship, and will field two of them this season: one for Ekström and another for JWRC champion Pontus Tidemand.
Built to compete in the top category of the championship, the EKS Audi S1 Supercar will pack a 2.0-liter turbo four with 600 horsepower, all-wheel drive and a 0-60 time of 1.9 seconds. It's expected to make its debut late in May at the World RX of Great Britain where it will have to tangle with specially prepared versions of the Citroën DS3, Ford Fiesta ST and Peugeot 208 driven by the likes of Tanner Foust, Ken Block, Jacques Villeneuve and Petter Solberg. The sole North American round will be held in Trois-Rivières, Quebec, in early August, on the same circuit that once hosted Indy Lights, ALMS, Grand-Am, Can-Am and Trans-Am races.

Audi RS5 gets big turbocharged power and an angry new look

Menace has always been one of the keys to Audi's RS 5 coupe, from the fat wheel arches to the rumbling evocative exhaust note to the brutal straight-line performance. That's not going to change with the new version, but Audi is talking loudly and proudly about how the RS 5 debuts the new RS design language, partly in the hope that people don't labor on the disappearance of its V8 engine. Yes, the all-new RS 5 Coupe uses the same Porsche-engineered biturbo V6 as the Porsche Panamera, and uses it to such effect that it extracts 444 horsepower and 443 pound feet of torque from its 2.9 liters of displacement. Those 443 lb-ft is a full 125 more than the V8 could ever muster, and it's available from 1,900 rpm to 5,000 rpm. That kind of power is sufficient to push the RS 5 to 62 miles per hour in 3.9 seconds on the way to a limited 155-mph top speed (there's an optional 174-mph limiter, too). The all-wheel-drive Quattro RS 5 Coupe doesn't suffer much in performance in the switch from the naturally aspirated 4.2-liter V8 to the force feeding of a V6, but it remains to be proven whether the sound can be as captivating. The Porsche-sourced engine continues the current trend of "hot vee" engines, situating both of its turbochargers inside the vee-angle of the engine, and combines centrally-mounted direct fuel injectors with a short stroke to boost power and improve economy. The high-compression Miller-cycle motor also lets the RS 5 Coupe pull its consumption down 17 percent to 32 miles per gallon (or 197 grams/km of CO2 emissions) on the European driving cycle. Expect US mileage numbers to be significantly lower. The new RS 5 is also significantly lighter, pulling 132 pounds from the previous V8-powered model's mass, despite all the turbo plumbing, to weigh 3,649 pounds. A BMW M4-style carbon-fiber roof helps keep the weight down. Audi feeds its newfound V6 power through an eight-speed automatic transmission and permanent all-wheel drive, with 60 percent of the drive nominally headed to the rear end. The hard-turning sport differential is an option. Audi's reborn RS 5 rides on five-link suspension systems at both ends to keep suspension bits precisely location and improve ride quality, while sitting 0.8 inches lower than the standard A5 Coupe. It has the usual Audi Sport array of go-faster options for its go-fastest front-engined coupe, including the more aggressive Dynamic Ride Control damping system, carbon-ceramic brakes and sharper steering ratios.

Watch the Audi R18 E-Tron Quattro long-tail testing at Monza

Audi released a single photo of the long-tailed version of its R18 E-Tron Quattro Le Mans racer, but the photo didn't offer the best view of the stretched rear. The car has been caught testing at Monza, in Italy, and not only do we get a better view of what it's got out back, we get pretty awesome sound as it makes high-speed runs past the camera.
Since the 2013-spec car was found to be down on performance versus the 2012, the long-tail is a different evolution to see if Audi can eke out more performance from its already dominant chassis. Have a look and a listen in the video below.