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Mercedes-AMG GT vs. Porsche 911 [w/poll]

Mercedes-Benz designed the AMG GT to compete head-on with the Porsche 911. It's a clear, singular purpose, and Benz brings a lot of money, technology and race-bred expertise to the fight.
The AMG GT is Merc's followup to the awesome SLS AMG, the retro-modern, gullwing-doored coupe that took us by storm half a decade ago. But this new GT coupe is a more focused sports car than the SLS, rather than an all out supercar capable of extreme performance. It's got a brand-new V8 engine, and state-of-the-art technology that help it to not only be a proper Mercedes, but to be a serious performer.
Mercedes will sell its new baby in two models. The GT S arrives first, in spring 2015, followed by the standard GT in mid-2016. Of course, there's room to grow from there. And while Porsche may have already expanded its 911 range to include a vast variety of models, here's how Stuttgart's icon stacks up against Affalterbach's bad boy.

2015 Porsche Cayenne S Quick Spin

There are sporty SUVs, but until the Macan came along, the Porsche Cayenne was arguably the only pure definition of a 'sports SUV, a la sports car. The second-generation Cayenne is now five years old, but still looks fresh. It's handsome without obvious effort, especially with the optional 21-inch 911 Turbo wheels. The Cayenne S replaces the old, 400-horsepower, 4.8-liter V8 with the brand-new, Porsche-developed 3.6-liter twin-turbo V6. This engine is quickly proliferating through the range – it powers the current Panamera S and the Macan Turbo. That former 4.8-liter started life as a 4.5-liter with 350 horsepower way back in 2002, specifically developed for the Cayenne, and to the end it remained a potent engine. We tried the new forced-induction V6 with 420 hp earlier this year in the Panamera S, and other than a soggy exhaust note it maintained the character of the former V8 sport sedan, with lusty power and hasty delivery. So, how's it do in the Cayenne? Driving Notes The Cayenne S version of the TT V6 gets 420 hp and 406 pound-feet of torque. That means there's 37 more lb-ft than the previous V8, and 22 more lb-ft than in the new Panamera S. Yet the 607-pound difference in curb weight between the Panamera and Cayenne means the V6 has a heavier load to lift here. And it shows – the instant response is dulled. Stomping the right foot gets the eight-speed transmission rappelling through gears to provide a little kick, but real gumption doesn't come until the turbos kick in. We're maybe talking about a second of pause compared to the Panamera, but a noticeable second. Perhaps a small price to pay for slightly better fuel economy, if you really care about such in your 420-hp SUV. Part of why we notice that second is that the Cayenne S is so right-now everywhere else that any perceived hesitation gets extra attention. It offers a specific adjustability that many sports cars don't have, with one button adjusting the three-mode air suspension and a separate Sport button tweaking the steering, throttle, gear changes, and traction control. With Sport keeping all the horses at the ready and the optional Porsche Torque Vectoring holding things steady, you don't need to step up to the GTS trim to get immediate acceleration, crisp steering, flat cornering at very un-SUV-like speeds, and tremendous stopping power from a total of 20 brake pistons. That said, the exhaust note here could also use a shot of Bruce Banner's gamma rays.

Juan Pablo Montoya tests Porsche 919 Hybrid in Bahrain

Sealing the FIA World Endurance Championship wasn't the only thing that Porsche did this past weekend in Bahrain. Alongside its rivals from Audi and Toyota, the German outfit also participated in a test session for potential new drivers, including Juan Pablo Montoya. Driving the Le Mans- and championship-winning Porsche 919 Hybrid at the Bahrain International Circuit this weekend, Montoya set the fastest time of the day. His "qualifying" lap was clocked at 1:40.86, barely more than a second behind the 1:39.67 lap that earned Timo Bernhard pole position in the previous day's race – and a second faster than the fastest lap set in the race by Neel Jani in another 919 Hybrid. That's a mighty impressive feat for a driver relatively unaccustomed to driving a modern hybrid LMP1. Racing fans will know Montoya as a multi-talented driver. The Colombian has competed successfully in Formula One, Indy, NASCAR, and sports prototypes, winning races in all disciplines. Aside from the International Formula 3000 title, three outright victories in the 24 Hours of Daytona, and a handful of NASCAR street-course races, Montoya can count among his many achievements the CART title, two Indianapolis 500 wins, and the checkered flag at the Monaco Grand Prix (along with six other F1 races). Those victories have brought JP among the closest to winning the Triple Crown of motorsports of any driver in racing history, and he's still competing. For those unfamiliar, the Triple Crown is an unofficial measure to gauge the diverse talents of professional racing drivers in three disciplines: Indy, F1, and Le Mans. To win, a driver has to win the Indianapolis 500, the 24 Hours of Le Mans, and either the Monaco Grand Prix or the Formula One World Championship. Graham Hill is the only driver in history to have swept all the categories, but others have come close. The list of near-winners includes Tazio Nuvolari, Mike Hawthrown, Phil Hill, AJ Foyt, Bruce McLaren, Jim Clark, Mario Andretti, and Emerson Fittipaldi. The only contenders still active are Montoya and Jacques Villeneuve, who won at Indy in '95, the F1 championship in '97, and came second at Le Mans in 2008. Villenueve could still steal the crown if he gets another shot at Le Mans, but the more likely scenario would be to see Montoya rise to the throne. Especially if this test session is any indication. Also driving the Porsche was in the rookie test session was Mitch Evans, a former GP3 champion and GP2 race winner from New Zealand.