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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 prices Q50 2.0t from $34,855, hybrid from $47,955

Infiniti has a whole range of new engines coming out for the Q50. And that means a new pricing scheme to go along with it. The bottom line is that you can now get into the sports sedan for as little as $34,855 (inclusive of the $905 destination charge). That price is for the 2.0-liter turbo model that's the new point of entry into the range with 208 horsepower on tap. It also represents a much lower starting price for the 2016 model than the one it replaces, which started at over $38k for the base Q50 3.7. It also undercuts the price of the comparable Audi A4, which also comes with a 2.0-liter turbo four priced from $38,250. The BMW 3 Series straddles the divide with two models equipped with 2.0-liter turbo fours: the less potent 320i with 180 hp priced slightly below the Infiniti at $34,145, and the more powerful 328i with 240 hp for $39,345. If you want all-wheel drive or the Premium trim, you'll need to cough up an extra couple grand for each, which is a larger premium than the Japanese automaker charged before. Pricing for the V6-powered 3.0t and Red Sport 400 models are still to come. But along with the 2.0t sticker, Infiniti also released pricing for the hybrid model, which only comes in Premium spec and starts at $47,955. That's a couple grand more than the outgoing version cost at $45,305. For the time being, the top of the line is the Q50 Hybrid Premium AWD, which goes for $49,955. Related Video: INFINITI ANNOUNCES U.S. PRICING FOR 2016 Q50 2.0T AND Q50 HYBRID PREMIUM MODELS First two of four available Q50 engines available now, new 3.0-liter V6 twin turbo-equipped models to follow later this year NASHVILLE, Tenn. – Infiniti today announced pricing for the 2016 Infiniti Q50 2.0t and Q50 Hybrid Premium models, which are on sale now at Infiniti retailers nationwide. Pricing starts at $33,950 for the Q50 2.0t and $47,050 for the Q50 Hybrid Premium. The Infiniti Q50 sports sedan, Infiniti's best-selling model, enters the 2016 model year with an array of significant enhancements, starting with the addition of three new turbocharged engines and continuing with new technologies designed to enhance the already strong driving dynamics of Infiniti's best-selling model. The 2016 Infiniti Q50 is now offered in an expanded range of trim levels, each in a choice of rear-wheel or all-wheel drive – Q50 2.0t and Q50 2.0t Premium, Q50 3.0t Premium, Q50 Hybrid Premium, Q50 3.0t Sport and Q50 Red Sport 400.

Infiniti QX Sport Inspiration Concept previewed ahead of Beijing debut

Infiniti's exterior design has been on point lately. The Q50, QX30, and especially the new Q60 Coupe are among the best looking vehicles in their respective segments. The company's designers even managed to make the homely QX60 look good. And now, those same stylists have issued their official preview of the successor to the QX50. It's called the QX Sport Inspiration Concept and will make its official debut tomorrow at the 2016 Beijing Motor Show. It's not hard to look at this stylish concept and imagine the second-generation QX50, formerly known as the EX. The proportions are just right, for one. The rear overhang is perilously short and the rear glass is raked aggressively – both work with the squat greenhouse and powerful hood to cut a sporty silhouette. The QX Sport Concept's headlights are better looking than the current model's, but still provide a menacing scowl as they flank the trademark Infniti grille. We like the large, air-curtain-style vents behind the front wheels, too; they're a more aggressive, functional take on the current QX70's side vents. The QX Sport's cabin is bisected by a high transmission tunnel, emulating the cockpit-like layout of the current model. And like in that car, this driver-focused layout demands driver-focused interfaces, like the flat-bottomed steering wheel and aggressive, single-piece bucket seats. We wouldn't count on that last item making the production shortlist, though. We'll have more on the QX Sport Inspiration Concept when it debuts tomorrow evening. Stay tuned. Related Video: