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Nissan returning to top-level US racing with this TUDOR entry

Muscle Milk Pickett Racing, formerly powered by Honda to two consecutive American Le Mans Series championships, is now officially powered by Nissan. The Japanese automaker's return to the top tier of US sports car racing comes with Nismo factory backing of the Muscle Milk entry in the newly created TUDOR United SportsCar Championship. Those with long memories will recall that Nissan walked away from America's then top-flight sports car series, IMSA, more than 20 years ago, having won 33 races, three manufacturer titles and four driver's titles from 1988 to 1991.
The ORECA 3 racecar's reveal also marks the introduction of Nismo Global Exchange drivers to the team. Alex Brundle, who drove for Nissan-powered OAK Racing last year in the FIA World Endurance Championship, will join Lucas Luhr and Klaus Graf at the Rolex 24 Hours of Daytona. It's his first time in a major US event, but having finished second in the WEC and in the LMP2 class at Le Mans last year, he's no novice. Nismo drivers will also contest the 12 Hours of Sebring and Petit Le Mans.
The No. 6 Muscle Milk entry will be hitting the track with the other competitors this weekend during the "Roar before the Rolex 24," with the race itself happening on January 25-26. You can read more about what's coming in the press release below.

Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

2015 Nissan Murano is the Sport Sedan Concept of crossovers [w/video]

The edgy new Nissan Murano has just been officially unveiled at today's New York Auto Show following its online debut earlier this week. Wearing sheetmetal clearly inspired by the Japanese brand's creatively named Sport Sedan Concept, the third-generation Murano continues the tradition of offering dramatic styling and surprisingly premium interiors.
With headlights and a grille that look lifted from the Detroit Auto Show concept, the Murano arguably has more design presence than it's ever had before, thanks to its sharply styled headlights and in-your-face grille. The profile is highlighted by an aggressive kink in the beltline behind the C-pillar, while the rear of the crossover sports a smallish rear window and strongly styled C-shaped taillights.
The redesigned interior isn't quite as dramatic a departure as the exterior, with a layout reminiscent of the larger Pathfinder. The material quality, though, looks to be significantly improved for 2015. There are also no shortage of optional, upmarket interior items, like heated and cooled front seats, a heated rear bench and an upsized panoramic sunroof.