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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.

2019 Infiniti QX50 Essential Drivers' Notes Review | Variable impressions

The 2019 Infiniti QX50 is the brand’s second smallest crossover, and itÂ’s fully redesigned for the 2019 model year. Infiniti decided to use the stylish QX50 as a technology flagship, specifically using it to debut its variable-compression engine technology. It has since been shared with Nissan in the new Altima, but Infiniti got the new 2.0-liter turbocharged four-cylinder first. It makes a solid 268 horsepower and 280 pound-feet of torque, numbers that are very similar to the outgoing QX50Â’s 3.7-liter V6. However, the 2019 QX50 with all-wheel drive (as our tester is equipped) nets you 26 mpg combined to the old carÂ’s 20 mpg combined rating. Infiniti pairs the new engine with its continuously-variable transmission. We happen to be testing the absolute pinnacle of what a QX50 can be: the “Essential” trim level. The base QX50 Pure starts at $37,645, whereas ours towers up to $59,085. That steep price is thanks to the addition of several high-dollar packages, including the $7,500 Sensory Package. This is the price youÂ’ll pay to get the ultra-luxe interior that we happened to fall in love with. The Autograph Package added $2,000, netting us white leather with the blue suede accents. Then the ProActive ($2,000) and ProAssist ($550) packages provide all the advanced driver assistance features like ProPilot Assist. Take note that the frustrating steer-by-wire (DAS) system is also included in the ProActive Package. Assistant Editor, Zac Palmer: When fully optioned as our QX50 Essential tester is, this interior can mix it up with the best in the business. You may have to sell a kidney to afford it, but the quilted white semi-aniline leather, soft blue suede and light maple (real) wood is going to make it all worthwhile. Infiniti certainly nailed it on the materials, but the interior design and styling flourishes are executed just as successfully. There's a simplicity to the flatness and gently curving horizontal lines that feels so graceful and luxurious. I feel that I'd never tire of the cream, brown and blue color combination, though that light-colored leather means I'd forever be trying extra hard to keep it clean. All of this interior loveliness was almost enough to make me forget about this crossover's interior tech shortcomings. Infiniti hasn't integrated Apple CarPlay or Android Auto, and the stock infotainment system isn't nearly polished enough to warrant such an omission.

2022 Infiniti QX60 First Drive Review | Wading back into deep waters

NAPA, California — Standing out in a field that includes the Audi Q7, Volvo XC90 and Acura MDX is no easy task. The trio nails driving dynamics, modern style and tech to a tee, putting all the more pressure on InfinitiÂ’s long-awaited revamp of its top-selling QX60. As a sophomore effort to an SUV that lasted well past its best-by date, the 2022 Infiniti QX60 undergoes a substantial overhaul to bring it up to snuff. Does it succeed? We scored seat time in all three rows for answers. Most visibly in this image-conscious segment, the QX60Â’s fully redesigned exterior is a less fussy, more serene look than the previous one, which debuted back in 2013 as the JX35. Gone are the deeply contoured body panels, whose pinched sheetmetal and curved character lines evoked a certain (and increasingly dated) moment in InfinitiÂ’s design language history. The new QX60 flattens many of those creases, bringing a smoother, more monolithic vibe to the table. According to Infiniti senior design director Taisuke Nakamura, the update embraces the concept of “Ma,” which describes a form of Japanese minimalism. WeÂ’re not sure if NakamuraÂ’s “kimono fold” headlights or “origami-inspired” dashboard are readily identifiable as such, but the redesign is nevertheless a handsome one. The 2022 QX60Â’s redux actually gives it a stylistic leg up on some competitors. The QX60 cabin has also been reworked to become a more livable space, starting with a de-cluttered dashboard that incorporates a fully digital instrument panel, an available 10.8-inch head-up display, and a standard 12.3-inch multimedia screen that replaces an 8-inch unit (the last QX60 never got Infiniti's bizarre double-screen tech interface). Standard tech includes wireless Apple CarPlay and Android Auto, six USB ports, a revamped Infiniti Intouch app that adds greater functionality, and the industryÂ’s first integration of remote starting via Alexa voice command. Up front, the interior comes across as sleeker and modernized, with a low-profile expanse of HVAC vents forming a sweep of horizontal lines across the dashboard. Though attractive, their functionality is somewhat hampered by the need to reach into the narrow slots in order to redirect the airflow up or down.  Some of the cabin's luxury touches are a bit heavy handed, like the Autograph trim level's diamond quilting on the dash whose stitches seem thick and indelicately executed.