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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.

Infiniti Q30 Concept uncovered in Frankfurt

The curtain has officially been raised on the Infiniti Q30 Concept at the Frankfurt Motor Show, an oft-teased five-door hatchback that will move the neo-luxury brand downmarket to compete with the Audi A3 and Mercedes-Benz CLA-Class. Not only is Infiniti moving down market, it's targeting a younger audience, a field that it hasn't traditionally played in, that wants something different than a hum-drum luxury car. According to Infiniti's marketing director, Hugues Fabre, "Younger customers are coming into the premium segment with their own attitude toward premium-ness."
Infiniti's trademark styling elements are on full display here, from the radically kinked C-pillar and Q50-inspired headlights and grille, to the dramatic character lines on the profile. In the cabin, it looks like an extraterrestrial disco, with a lot of violet lighting, bronzed touchpoints and creamy leather. Ignore the concept car tinsel, though, and you'll see that Infiniti is dead serious when it says the Q30 foreshadows a production model.
We'll have plenty more of the Infiniti Q30, including live images from the 2013 Frankfurt Motor Show floor, very soon. Until then, click over to our Frankfurt coverage page, scroll down for a full press release on the Q30, or click over to the high-res gallery.

Infiniti expanding lineup by 60% over next five years

Johan de Nysschen had only been at the helm of Infiniti for two years when he left for a position atop Cadillac. But in that time, he indeed left his mark on the brand. Most visibly, there was the drastic Q-ification of the company's vehicle naming strategy, but beyond that were big plans to beef up the Infiniti brand with the goal of making it a fully competitive luxury automaker.
Autoblog spoke with Michael Bartsch, vice president of Infiniti Americas, during Monterey Car Week, and he confirms Infiniti's brand direction is "still exactly as Johan presented it." Over the next five years, the company's portfolio will expand by 60 percent, and that will be aided with additional engine and transmission plants, most notably the recent collaboration with Daimler to build 2.0-liter turbocharged four-cylinder engines.
Infiniti's lineup will grow to include eight sedans/coupes and five crossovers/SUVs.