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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.

Mercedes leads in US luxury car thefts

Mercedes-Benz makes some fine automobiles. The Silver Arrow'd cars are so good, apparently, that thieves can't help but try to steal them. The German brand is at the top of the charts for luxury car thefts in the US, according to the National Insurance Crime Bureau, with New York City leading the way. (And those New Yorkers complain about Detroit being bad!)
The C-Class was the most stolen model, with 485 ganked between 2009 and 2012 in NYC alone, while the E-Class and S-Class (which also boasted the worst recovery rate, at 59 percent) both finished in the top ten. Following the C-Class was the BMW 3 Series and Infiniti G. Not surprisingly, each of these were the most common models in their respective lineups. Los Angeles and Miami are also prime hotspots for luxury car thefts, according to the Detroit News report.
While getting your car stolen is pretty awful, there was one inspiring statistic compiled by the NICB - the average recovery rate across the board was 84 percent, with the Cadillac CTS getting recovered 91 percent of the time.

Driver Lets Infiniti Do The Driving For Him

Self-driving cars seem like the way of the future, but some can't stand the wait. Like this guy, driving down Germany's famous Autobahn in an Infiniti Q50 with Active Lane Control. To test how active the Active Lane Control feature really is, he moves from the driver's seat to the back seat and lets the car's suite of safety systems take control. Active Lane Control debuted in 2013 as part of the Lane Departure Prevention system. It helps Q50's driver use fewer steering inputs by compensating for road conditions. It works with the LDP to keep the vehicle in its intended lane. Used with cruise control, the car maintains its position fairly well on the road. Active Lane Control is only there to help however, not drive for you. While the technology is impressive, it certainly isn't up to the task of navigating the road full time. This driver/passenger is putting his life and the lives of everyone around him in serious danger. We suggest other Infiniti owners wait for the real deal. The future is closer than you think. Related Gallery New Tech Means Self-Driving Cars Are Already Among Us Infiniti Safety Technology Gadgets