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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.

2014 Nissan Dayz Roox is the littlest high-roof van you ever did see

Even average production cars from Japan often seem very conceptual to US eyes. Throw in typical, nonsensical-quasi-English-words name like "Dayz Roox" and you'd be forgiven for thinking this Nissan box on wheels was still a designer's dream. But the fact is that the Nissan Dayz is a model currently on sale, and this Roox version is the latest take on the micro-van, which is a popular segment in Japan.
In fact, this generation of Dayz is the first minicar that Nissan has developed completely in-house, and the thing has been selling astoundingly well in its first stint on the market (30k units in month one month, says Nissan). So it's unsurprising that the company is looking to expand the range with a model that is more fully featured.
The Roox (we have no clue as to where that name came from, or what it means) would appear to be a high-roof version of the three-cylinder Dayz minicar - in fact Nissan goes so far as to call it an "Impressive Super Height Wagon." Features like automatic sliding doors, Around View Monitor and UV-insulated glass are all luxuries in kei-class car. The press release also specifies that the Roox is tall enough to swallow a 27-inch bicycle.

Takata adds millions to recall expansion in US [UPDATE]

UPDATE: Ford spokesperson Kelli Felker has advised Autoblog that of the 1,509,535 total vehicles worldwide that the company is recalling, 966,504 of them are new additions for this expanded safety campaign. Last week, the National Highway Traffic Safety Administration announced that the Takata airbag inflator recalls would expand to an estimated 33.8 million vehicles in the US. However at the time, automakers weren't sure specifically which of their models might be affected under this enlarged campaign. Now, the numbers for BMW, FCA, Ford, and Mitsubishi are being released by the agency. Additionally, Honda is outlining the broadening of its own campaign. BMW's recall amounts to 420,661 vehicles in the US, an increase from 140,696 previously. All of the following models need their front, driver's side airbag replaced: 2002-2005 BMW 325i/325xi/330i/330xi Sedan 2002-2005 BMW 325xi/325i Sportswagon 2002-2006 BMW 330Ci/325Ci/M3 Convertible 2002-2006 BMW 325i/330i/M3 Coupe 2002-2003 BMW M5/540i/525i/530i Sedan 2002-2003 BMW 540i/525i Sportswagon 2003-2004 BMW X5 3.0i/4.4i BMW has received no reports of any injures or deaths from this problem in its vehicles. FCA has 5,224,845 vehicles globally in need of inflator replacements, according to its statement. However, the company is only aware of one injury related to the issue, which occurred in a 2006 Dodge Charger in southern Florida. There are 4,747,202 vehicles worldwide from the company that are affected on the front, driver's side. Among these, 4,066,732 are in the US, 374,508 are in Canada, and the rest are in other countries. The models are: 2005-2009 Dodge Ram 2500 Pickup 2004-2008 Dodge Ram 1500 Pickup 2006-2009 Dodge Ram 3500 Pickup 2007-2009 Dodge Ram 3500 Cab Chassis 2008-2010 Dodge Ram 4500/5500 Cab Chassis 2008-2009 Sterling 4500/5500 Cab Chassis 2004-2008 Dodge Durango 2007-2008 Chrysler Aspen 2005-2010 Chrysler 300/300C/SRT8 2005-2010 Dodge Charger/Magnum 2005-2011 Dodge Dakota 2006-2010 Mitsubishi Raider Also, there are 438,156 vehicles in the US, according to the NHTSA documents, that need their front passenger's side inflators replaced in the expansion of an earlier regional recall: 2003 Dodge Ram 1500 2003 Dodge Ram 2500 2003 Dodge Ram 3500 The total number of vehicles from Ford now covered under these campaigns stands at 1,509,535 worldwide. Of this total, there are 1,380,604 in the United States, 93,207 in Canada and 16,953 in Mexico.