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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.

Genesis G70 vs sport sedan rivals: How it compares on paper

We got our first look at the Genesis G70 sport sedan today. We think it looks good, with enough ties to its fellow Genesises (Geneses?) to further establish the brand and just enough distinction to help it stand out from the crowd. But ah yes, the crowd. Although Genesis didn't release the G70's full spec sheet, it revealed just enough for us to start sizing it up to its future competition. There are certainly others with which to compare (Lexus IS, Cadillac ATS, Alfa Romeo Giulia, Jaguar XE just to name a few), but we decided to take a look at the best sellers and most competitive luxury sport sedans. (And hey, if you like this, we can always do a follow up) So, here we have the Genesis G70 vs BMW 3 Series vs Audi A4 / S4 vs Mercedes-Benz C-Class vs Infiniti Q50. Nothing like a good chart to dig your teeth into on a Friday. Note that we only compared those models that line up with the G70. So, we left out the BMW 320i and Audi A4 Ultra entry level models as well as the Q50 3.0t mid-grade model that's considerably cheaper than the German performance upgrade models we listed. All 0-60 figures are rough estimates based on several sources, models/drivetrains and OEM figures. Related Video: Featured Gallery Genesis G70 vs other sport sedans View 15 Photos Audi BMW Genesis Infiniti Mercedes-Benz Luxury Sedan consumer infiniti q50 audi s4 genesis g70 mercedes-benz c-class bmw 330i bmw 340i

The Infiniti Q30 is dead! Long live the Infiniti QX30!

Remember that Infiniti Q30 hatchback we drove last month? It's not coming to the US. But it also is coming to the US. Let us explain. Because of our crossover-obsessed culture, it's easier for automakers to brand new offerings as CUVs rather than hatchbacks. Take one five-door, front-wheel-drive car, add a teensy bit of ground clearance and all-wheel drive, and boom, success! So because the Q30 and ever-so-slightly higher-riding QX30 are so darn similar, Infiniti made the decision to just sell them both under the QX30 name. This might seem stupid to most, but to Infiniti – and the crossover-buying masses – this is actually a pretty logical move. The QX30 arrives in mid-2016. On the base end there's the standard QX30, then there's the lower-riding QX30S, and finally, the higher-than-standard-riding QX30 AWD. They all come with a 2.0-liter turbocharged four-cylinder engine and a seven-speed dual-clutch transmission. They're also practically identical to the Mercedes-Benz A-Class and GLA-Class, except for the swoopy sheetmetal. But even Mercedes sells its cars as two separate model lines. If you're not confused enough yet, feel free to read more in the press release below. Related Video: Infiniti announces QX30 line-up in the AmericasInfiniti QX30 Premium Crossover set to go on sale in mid-2016 NASHVILLE, Tenn. – Infiniti today announced the line-up of its all-new QX30 premium active crossover for the United States and Canada. While sharing basic exterior and interior designs, the QX30 line will be offered in three unique versions, each with its own front and rear fascia, wheel design and interior themes: QX30: The crossover's highly sculpted exterior, unique stance and asymmetric cabin design exemplify Infiniti's design-led approach to product development. This version is sold in Europe and other regions outside of the Americas under the Q30 name. In the Americas, this model will be front-wheel drive. QX30S: With a lower stance, aggressive front and rear fascia, cross-drilled front brake rotors, 19-inch wheels and performance tires, the QX30S is the sports version of Infiniti's new premium compact line. It was shown at this year's Los Angeles Auto Show and is sold in other markets as the Q30S. QX30 AWD: With an intelligent all-wheel drive system, slightly higher ride height and off-road inspired front and rear valence panels, the vehicle is able to take on urban, suburban and winding rural roads in all driving conditions.