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The 2017 Porsche 911 RSR goes mid-engine, purists be damned

Porsche unveiled its World Endurance Championship and IMSA WeatherTech Championship competitor with the 2017 911 RSR. And this 911 is different from the rest, as the 4.0-liter flat-six engine powering this beast is in front of the rear axle, not behind it. That's right, this 24 Hours of Le Mans competitor ditches the iconic rear-engine layout. Porsche isn't talking specifics on how exactly things are arranged back there. The engine is new, now based on the 991 911's block instead of the previous Mezger motor that's been used for years. The transmission design is new as well – it would have to be to accommodate the new location relative to the engine. The racecar has been engineered to meet the LM-GTE class, where it will go up against other mid-engine cars like the Ford GT and Ferrari 488 GTE. Moving the engine to the middle has given Porsche the ability to fit the 911 RSR with massive bits of aero, like the humongous rear diffuser that looks like it would be more at home on a machine of war. The only thing that can compete with the diffuser for size is the top-mounted rear wing, which shares a similar design to the one found on the 919 Hybrid. Going back to the engine, the direct-injected boxer motor, depending on the size of the restrictor, generates as much as 510 horsepower and sends all of its fury to the rear wheels. The engine is paired to a six-speed sequential gearbox, which drivers can employ through paddles on the steering wheel. The new engine doesn't have a lot of weight to push around as the 911 RSR, as required by regulations, weighs 2,740 pounds. Speaking of weight, the engine layout isn't the only change for the 911 RSR. For 2017, the car ditches its steel body for one that's made out of carbon fiber. The body attaches to the chassis via quick-release fasteners, making the vehicle easier to service as exterior elements can be removed with minimal effort. The racecar also gets a radar-based collision system – aptly named the "Collision Avoid System" – which is meant to limit the 911 RSR's encounters with faster LMP prototypes. Only time will tell if the new layout and aerodynamic components help the 911 RSR beat its competition. But there will be plenty of opportunities to see the racecar in action as Porsche plans to run the 911 RSR in 19 races during the 2017 season, the first of which will take place at the IMSA opener on January 28th at Daytona, where the racecar will make its track day debut.

Porsche Macan Turbo vs Cayman GTS in track battle

"Well this is stupid." On the surface, that was our reaction to this video, as well. Why would you compare the hottest Porsche Cayman with a crossover of any kind, even if it is the 400-horsepower Macan Turbo?
We're guessing because it'd be bloody good fun, as evidenced Auto Express's latest track battle. To be fair, there is some interesting stuff here. The two do have a similar starting price, separated by less than $3,000 here in the US market. And, factoring in the Macan's hefty horsepower and torque advantages - 60 horsepower and 126 pound-feet - does make for a slightly interesting comparison.
We won't spoil the verdict, so check out the full video from Auto Express, and then let us know what you think in Comments.

All the crazy stuff we saw at McCall's Motorworks Revival

Every year, Gordon McCall puts on a lavish event packed with rare cars and planes (and the type of people that can afford rare cars and planes). And every year, more ridiculous stuff shows up. It's the good kind of machine overload. It's likely the only place in the world where you'll see a line of BMW 3.0s next to some Paganis next to a Porsche 911 by Singer Design next to a Ferrari salt racer next to a custom Olds Riviera next to the latest from Koenigsegg next to he coolest stuff Shelby ever made next to a hangar filled with McLarens, including a few P1 GTRs. And then all of that is surrounded by private jets, fighters, and planes that could have flown in directly from WWII. In a word, it's insane. Walk through the gallery above to get a taste for what was there this year for the event's 25th anniversary. Related Video: Featured Gallery 2016 McCall's Motorworks Revival View 29 Photos Image Credit: Copyright 2016 Drew Phillips / Autoblog Motorsports Misc. Auto Shows BMW Ferrari McLaren Porsche Koenigsegg