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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 Micra

Several years ago, poutine started showing up on the menus of a number of Detroit-area restaurants. For those unfamiliar with the Canadian specialty, it involves serving up french fries, gravy and cheese curds all in one artery-clogging heap. It's not really my thing, but the comfort-food dish has caught hold here in The D, and many absolutely swear by it. In a country where we happily serve Double Down sandwiches, and where competitive eating qualifies as sport, it's hard to believe le poutine isn't spreading like wildfire.
Given Detroit's proximity to Canada, it's not surprising that this culinary creation has managed to find its way across the border. The same thing goes for cars - we Detroiters are routinely privy to lots of Great White North imports. No, we can't buy not-for-US vehicles like the Nissan X-Trail, Mercedes-Benz B-Class (at least, the gasoline version), or now-discontinued products like the Honda Civic-based Acura CSX or EL before it. But Ontario-plated examples of these cars can be seen all the time here in southeast Michigan - it's a far more common occurrence than you might think.
These days, it's rare that an automaker will introduce a model to Canada without offering it up in the United States - especially a car that stands to do big things for a company's presence in North America. But with this 2015 Nissan Micra, that's exactly what's happened; Nissan's US arm has repeatedly stated that there are no plans to offer the car in Yankeeland. Why is the Micra so important? This five-door hatchback enters Canada with the coveted title of being the most affordable new car in the country: just $9,998 Canadian (CAD) to start. In fact, the Micra launches to our north just as the larger, four-door Versa Sedan is phased out in Canada - a vehicle that holds the lowest-cost title here in the US, at $11,990 USD.

Nissan recalling 151,000 CUVs over ABS issues

Nissan will be recalling over 151,000 vehicles due to issues with the anti-lock braking systems. On rough roads, light braking in the Nissan Pathfinder, Infiniti JX35 and QX60 could trigger a problem in the brake pressure output software that might lead to longer stopping distances than expected relative to the brake inputs. Needless to say, unpredictable stopping distances on rough roads is not a desirable trait in a three-row, family friendly CUV.
The recall covers all 2013 and 2014 Nissan Pathfinders built between April 18, 2012 and September 20, 2013, some 100,682 vehicles. Another 52,629 2013 to 2014 Infiniti JX35/QX60s built between September 15, 2011 and September 20, 2013 are also part of the notice.
Nissan will request that owners of affected vehicles report to dealers for a free software update to address the problem. Scroll down for the official notification from the National Highway Traffic Safety Administration.