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Nissan previews new Sport Sedan Concept ahead of Detroit debut

When the Cobo Center opens its doors in a couple of weeks for the Detroit Auto Show, there'll be plenty of new metal on display - and this is the latest.
Nissan announced today that it will bring a new Sport Sedan Concept to the Detroit show, releasing the short statement below accompanied by the teaser image above. Expected to hint at the next Maxima, the concept "previews a new energetic design direction that amplifies Nissan's legendary approach of applying sports car principles to a sedan."
That's about all Nissan is saying for now, so we'll have to wait a while longer to find out more. But the concept will be joined on the show floor by the IDx Freeflow and IDx Nismo concepts that'll be showcased for the first time in North American after their debut at the Tokyo Motor Show over a month ago.

Nissan sells 100,000 Leaf EVs worldwide

Nissan sold 22,610 Leaf electric vehicles in the US last year, but the bigger story (literally) is how the company is selling the EV around the world. After selling the 99,999th Leaf to a woman in Virginia, Nissan sold the 100,000th Leaf to a man named Brett Garner in the UK. For the record, it took Nissan just about three years and one month to reach that mark, since the first Leafs were sold in December 2010. On a global scale, Nissan says the Leaf has a 45 percent market share among all the electric vehicles available. The car is available in 35 countries, but the bulk - as of the end of December, 42,122 units - have been sold in the US. That 99,999th Leaf was sold to Amy Eichenberger, a project manager overseeing major capital investments for the University of Virginia in Charlottesville (pictured below). Garner owns a dental practice in Fareham. You can read their gushing quotes about their new EVs in the Nissan press releases below. If you add in all of the electric vehicles that Nissan and partner Renault have sold (90,000 as of March, the last time official numbers were available), then the 100,000 was topped a while ago. Of course, electric vehicles remain a small portion of Nissan's global sales. In fiscal 2012, Nissan sold 4.9 million vehicles around the world. Still, 100,000 Leafs out of 4.9 million cars is far better than zero. Nissan LEAF global sales reach 100,000 units Nissan LEAF is best-selling EV in history with 45% market share The 100,000th customer is a British dentist After revolutionizing passenger vehicle segment Nissan is electrifying LCVs with the e-NV200 YOKOHAMA, Japan (January 20, 2014) – The 100,000th all-electric Nissan LEAF is being bought by a customer in the United Kingdom. The Nissan LEAF, the world's first mass-produced zero emissions vehicle, remains the best-selling EV in history with a 45% market share. Since its launch in December 2010 Nissan has seen the pace of sales increase consistently and 2013 was a record year. The LEAF is now available to customers in 35 countries on four continents. In Norway, the Nissan LEAF topped sales charts, out-selling conventional gasoline powered vehicles in October 2013. The 100,000th Nissan LEAF customer is Dr. Brett Garner, the owner of a dental practice in Fareham in the UK. "I have chosen my Nissan LEAF because I am very interested in its running costs," Dr. Garner said. "The cost of ownership such as maintenance, insurance and charging also convinced my wife.

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.