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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 Versa Note adds sporty-ish SR trim

The funny, little Nissan Versa Note is getting a new trim level - two, actually - for the 2015 model year. And the one you see above is the sporty-ish Note SR, making its debut at the Chicago Auto Show this week.
Underneath, it's the same Versa Note we've already driven, complete with Nissan's 109-horsepower, 1.6-liter inline four-cylinder engine and up to 40 miles per gallon highway. The SR's changes are purely cosmetic, with a revised front fascia featuring smoked headlamps, standard foglamps and black chrome accents. Those are matched with new dark-finished 16-inch alloy wheels, revised mirrors and side sills, along with a new rear roof spoiler.
A few interior enhancements have been made, as well, with the addition of a "370Z-inspired" leather-wrapped steering wheel, suede-like fabric on the seats with orange accents and a piano-black center stack.

Nissan Friend-Me Concept is cooler than its name

Here is the Nissan Friend-Me, a swoopy - and let us emphasize that word "swoopy" - sedan-with-a-hatchback developed specifically for Chinese youth in their mid-twenties, the ones born in the '80s mainly bereft of siblings due to China's one-child policy. The exterior is meant to be most imposing at night, when Nissan figures these single children will be getting together with their friends. The sheetmetal looks like it was shaped by waves, and the details like lighting and vent openings could have been penned on Krypton.
The real show is inside, where peers are made equal and can interact with one another via the "oracle stone." The concept is that instead of a driver and three passengers, everyone gets access to the same information and the ability to alter the ambiance of the car - dash readouts are provided for all of the occupants, and anyone can move content from their phones to the in-car screens to be shared throughout. As Nissan says, it's the end of anyone being a "music dictator."
Designed by Nissan Design China for a specific market-within-a-market estimated to contain 240 million potential buyers, Nissan says the wishes of these customers and the ideas in this car could shape automotive offerings for decades to come. So read all about it in the press release below and take some long virtual looks in the galleries of high-res photos.