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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.

Nissan quietly, quickly installing more CHAdeMO stations

Nissan Leaf electric-vehicle sales continue to grow. And the number of US fast-charging stations that the Leaf can use are growing, well, faster. As it should be. Nissan has made good on its early-2013 vow to help ensure that the number of CHAdeMO stations in the US tripled by mid-2014, with Atlanta, San Francisco, Los Angeles and Dallas emerging as the most prevalent US markets, Green Car Reports says. In fact, the number of such stations, which can charge a Leaf to 80-percent battery capacity in about a half hour, has jumped to 633 from about 160 as of January 2013. About 180 are at Nissan dealerships, and that number should continue to surge since Nissan plans to aggressively add fast-charging stations through next March. Nissan spokesman Brian Brockman, in an e-mail to AutoblogGreen, confirmed those numbers and added that companies such as NRG, through its eVgo program, are also adding fast chargers throughout the country. The continued increase is good news for drivers of the Mitsubishi i (okay, we admit, there are not that many of them out there) and future drivers of the Kia Soul EV, as both of the models are CHAdeMO-compatible. Granted, the US has nothing on Europe, where the number of CHAdeMO stations has jumped to more than 1,000 from about 600 stations early last year. Nissan expects the continent to have about 1,800 fast-charging stations by year end. Still, the number of US CHAdeMO stations dwarfs the number of Tesla Motors' Supercharger stations, which total about 100.

2015 Nissan 370Z Nismo

If you blinked, you missed the opportunity to pick up the last iteration of the 370Z Nismo, because after just a touch over a year of availability, Nissan is replacing it with this updated 2015 model - the third 370-based iteration from the brand's in-house tuner. Consider this version to be the 370Z's swan song. An all-new version is expected soon with a downsized turbo mill (something in the vein of a 240Z would not be impossible). That reality aside, the latest 370Z Nismo is a compelling package. It looks like a million bucks, takes a corner with verve, and gets belated tech goodies. Here are our impressions from a drive we took last week near Nissan's US headquarters in Tennessee.
Driving Notes
The Recaro seats are wonderful (shocker!). In fact, the interior in general has a much more strapped-down feel about it. A run-of-the-mill 370Z feels pretty great, although it's not a place for the big-boned. As with past Nismos, upgrades include contrasting colors on the faux-suede seat inserts, the gauge hood, the ten and two positions on the steering wheel, and a red centering stripe on the wheel. The upgraded materials are all nicely chosen and the cabin is a very sexy place to live - weirdly practical, too, considering the huge cargo area. Checking the "Tech" model option box brings a 7.0-inch nav screen in place of the upward swinging door over a storage cubby, a much-needed backup camera, an impressively good Bose stereo, and de riguer Bluetooth connectivity with audio streaming. Everything seems to work as advertised.