2003 Infiniti Fx35 on 2040-cars

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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.

2017 Infiniti QX30 brings style in a small package to LA

There are already no shortage of luxurious compact crossovers on the market, like the Lexus NX and Mercedes-Benz GLA-Class. Infiniti clearly sees room for growth with the debut of the production QX30 at the Los Angeles Auto Show. The highly sculpted CUV arrives next year to offer another stylish entry in the segment. The production QX30 clearly adapts the swoopy concept's design from the Geneva Motor Show, but the designers soften things slightly. The kinked C-pillar comes straight from the earlier shape, and the arching character line now runs through both door handles along the side. Narrow lights at the front and rear also give the CUV a sporty look. Inside, leather and metallic trim abound, and the infotainment system sits high on the center stack. The QX30 will be available with diesel and gasoline engines, depending on the market, but the 2.0t on the fender here suggests this one uses the turbocharged unit from its Q30 hatchback sibling with 208 horsepower and 258 pound-feet of torque. A seven-speed dual clutch gearbox is standard on the CUV, and an all-wheel-drive system can send up to 50-percent of the power to the rear wheels as necessary. Infiniti hopes young buyers gravitate toward the model's bold shape when the QX30 goes on sale. LA seems like the perfect place to catch the eye of these potential customers. Infiniti QX30: A premium active crossover for all purposes • QX30 debuts as a new premium offering for global markets • Combines crossover appearance with signature Infiniti design cues • Delivers a confident drive and versatile attitude, aided by intelligent all-wheel drive • Intuitive technologies enhance safety, comfort and convenience • Part of first Infiniti production in Europe, at new facilities in Sunderland, UK • Simultaneous world premieres at Los Angeles and Guangzhou motor shows HONG KONG – The Infiniti QX30 premium active crossover is making its simultaneous global debut at the 2015 Los Angeles and Guangzhou international motor shows – signalling the next phase of the company's global growth strategy. Created for a new generation of premium buyers who appreciate category-defying design inside and out, the QX30 boasts a purposeful appearance that makes a bold visual statement as part of Infiniti's premium model line-up.

Infiniti explored V8, diesel, hybrid power for Q50 Eau Rouge

Infiniti boss Johan de Nysschen "insists" the car be put into production.
Over the past few years, rumors have swirled about an Infiniti-badged, four-door version of the Nissan GT-R. Makes sense to us - Infiniti could certainly use a performance halo, and the seemingly forgotten IPL initiative hasn't exactly bore any interesting fruit. Enter the Q50 Eau Rouge, which recently debuted for a second time at the Geneva Motor Show packed with the 3.8-liter, twin-turbocharged heart of Godzilla itself.