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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 Q30 First Drive

Audi and BMW have owned the premium C-segment for almost a decade now thanks to the A3 and the 1 Series (and 2 Series). Benz's A-Class has become less of a retiree's option and has spawned a popular (if not particularly good) sedan (the CLA) and a crossover (GLA). Down in the lower-class decks, machinery from Subaru is punching well above its weight, while Volkswagen's Golf owns the market in Europe. This all left perennial premium pretenders like Lexus and Infiniti with a problem: how to convince buyers their C-segment machinery was genuinely premium if they were based off a volume-selling donor body from Toyota or Nissan? Mercedes-Benz opened an odd window of opportunity for Infiniti. See, Benz's parent, Daimler, and Infiniti's motherships, Renault and Nissan, have had a technical alliance since 2010. A big technical alliance. So Infiniti was able to develop its hatch to sit atop the A-Class chassis, powertrain, and suspension architecture, though you'd barely know it by looking at the Infiniti from the outside. It has a style all its own, and you're not going to mistake a single angle on the Q30 for anything that comes out of Stuttgart. Nobody makes deeper cuts and curves into its metal than Infiniti. The Japanese brand claims that design is at its core, and whether you love or hate that design, it's hard to argue that point. The Q30 feels like a nicer, easier, more luxurious place than the A-Class on which its based. "Infiniti design is very three-dimensional on every panel. We want to give the sense and the feeling that every Infiniti has been made by an artisan, by hand, not by computer," the company's London-based design boss, Simon Cox, argued. Some will love it, some will hate it, and Infiniti can live with it either way. The point is that the brand is now on the field in a segment that is projected to keep growing at more than 9.4 percent globally, and it got there at a fraction of the normal cost of an all-new car, without having any easily identifiable cap tips to the Benz's far more conservative exterior design. The Benz bits are more obvious inside. Infiniti did such a good job of grafting its design ideas onto the interior hard points that it feels like a nicer, easier, more luxurious place than the A-Class, even if the Benz will be between eight and 10 percent more expensive in most markets. The dash top is clean, swooping, and stitched together beautifully.

2020 Infiniti QX50 Luggage Test | Not infinity, but enough

The 2020 Infiniti QX50 is a comfortable five-seat luxury crossover that competes with the Audi Q5, Acura RDX, Volvo XC60, Lexus NX and others. If you’re interested in a QX50, itÂ’s probably got something to do with its impressive, technologically advanced VC-Turbo variable compression engine. It also has sumptuous swales of bodywork, a long list of driver-assist and safety features, and a solidly luxurious interior with a two-screen infotainment setup. The window sticker for the QX50 we drove recently in Essential trim says the seats were leatherette; if true, itÂ’s the most buttery fake leather out there. Still, the engineÂ’s the star. If performance is your only consideration, you can also get the VC-Turbo in the Nissan Altima sedan weighing 400 to 500-plus pounds less and at an MSRP starting $7,500 lower, a price spread that quickly expands as you option up the QX50. But if you want the QX50, itÂ’s probably because itÂ’s a crossover. You want to haul stuff. Which brings us to: luggage test. The QX50 has a cargo capacity of 31.1-31.4 cubic feet behind its raised back seat, which expands to 65.1 cubic feet with the rear seats down. That's more than most in its class, and the QX50Â’s cargo hold certainly looks big and usable enough. To test it, I had six roller suitcases at my disposal. Three would need to be checked at the airport, and one of those is particularly mondo (29x19x11, 26x17x10, 25x16x10). Three others were small enough to carry on (24x14x10, 23x14x11, 22x14x9). Several bags have four wheels that protrude and were counted in the dimensions. I lacked access to RiswickÂ’s wifeÂ’s fancy bag. An asterisk to all our luggage tests: Our crack team of test suitcases is empty. I know someone who can seriously overstuff a soft-sided bag, so depending on how you pack, your results may vary. The QX50 didn't arrive with a cargo cover, so that made things easier. My first stab at loading all those bags seemed promising — five out of six bags fit. Two of the big boys on edge, three carry-ons standing up. That would be one bag for every occupant, but hey, we can do better.  Standing them all up was the easy solution. This fits all six bags, and I'm certain they wouldn't fly forward in a hard stop. But the driver's rear view is impeded. I'd be annoyed to look back at this throughout a long trip. That biggest bag is the biggest offender, so can we just lay that one down? Sure, but we're back to just five bags fitting.