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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 wants French State out of its alliance with Renault

While it's called the Renault-Nissan Alliance, the French side actually throws around a lot of weight in the relationship, and the government there is the largest shareholder. Meanwhile, the Japanese company generates about two-thirds of the sales. As leader of both automakers, Carlos Ghosn is reportedly now working to put more control into the Nissan side, according to insiders speaking to Reuters. The French State is expected to fight hard against losing sway. The government in France prompted Ghosn's distrust after buying up 19.7 percent of Renault's stock, from a previous 15 percent. Officials snubbed the CEO by giving him just a few hours notice, according to Reuters. Now, the boss is looking for ways to mitigate state control, but to make this plan happen Ghosn needs formal approval from the Renault board. If successful, the proposed plan would overhaul the close partnership between the automakers. Whereas the French side currently has the final say in decisions, this move would grant both of them equal power. In addition, Nissan would become the largest owner of Renault, but the French wouldn't have the same control over its Japanese ally. The French government isn't ready to just hand over power to Ghosn, though, because it reportedly wants to protect jobs in the country. The Alliance "must not be destabilized by governance changes or adjustments that could also lead to conflicts of interest," Economy Minister Emmanuel Macron said to Reuters. Clearly, this fight is just beginning. Related Video:

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.