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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 Q80 Inspiration concept is bringing its sexy back to Paris

A little over a month ago, Infiniti hinted at a new concept car it was apparently lining up for the upcoming Paris Motor Show. Then a few weeks ago it showed us a little more. But now, we're getting our best look yet at the new showcar.
Called the Q80 Inspiration, the concept takes the form of a four-door fastback - something along the lines of the Porsche Panamera or Audi A7, but with Infiniti's signature swoopy lines. Created to serve as "a design and technological highlight to which Infiniti's four worldwide design studios will refer regularly in coming years," the Q80 Inspiration may be more design study than pre-production prototype. But the concept is to be taken, according to the statement below, "as clear intent to have an entry into the newly defined premium fastback segment."
Incrementally larger than the Panamera in every dimension but height, the Q80 features a teardrop greenhouse, with four doors opening "portal style" into a four-seat cabin done up in carbon fiber, aluminum and leather. Watch this space for more as Infiniti continues the gradual reveal of its new show car as its debut in Paris approaches apace.

Least satisfying vehicle rankings seek to highlight the worst cars of the year

Consumer Reports polls its members on all sorts of topics related to how they buy and use products ranging from mobile phones to humidifiers for indoor plants. Cars are regularly one of CR’s most interesting topics, and its recent study on the least satisfying vehicles to own offers insights into the cars people wish they hadnÂ’t purchased. CR polled thousands of members with questions about what they liked and disliked about the vehicle theyÂ’d owned for a few years. When asked if they would definitely repurchase the same car, the following vehicles came back as the least likely to be purchased a second time: Kia Forte: 51% would buy again Nissan Altima: 51% would buy again Nissan Kicks: 49% would buy again Volkswagen Taos: 48% would buy again Kia Seltos: 48% would buy again Jeep Compass: 46% would buy again Mercedes-Benz GLA: 45% would buy again Infiniti QX50: 40% would buy again Mercedes-Benz GLB: 39% would buy again Volkswagen Atlas Cross Sport: 38% would buy again When Autoblog tested the VW Atlas Cross Sport in March 2022, we liked the styling and the price was right, but it lagged rivals in driving excitement and interior quality. A number of recalls donÂ’t help the Cross SportÂ’s cause much, either, as some models have more than a dozen actions by the National Highway Traffic Safety Administration. Even the 2023 model already has four recalls. The annoyance of recalls and the hassle of just-average reliability ratings could have played into the Cross SportÂ’s place as the least satisfying vehicle. On the other end of the spectrum, the Chevrolet Corvette earned the top spot as CR's most satisfying car. The Porsche 911, Rivian R1T, Ford Maverick Hybrid, and Hyundai Ioniq 5 round out the top-five most satisfying vehicles to own. Given the rabid following the 911 has built over the years and the insane performance Chevy derived from the latest Corvette, itÂ’s not surprising to see them in the top spots. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Green Infiniti Jeep Kia Mercedes-Benz Nissan Volkswagen Car Buying Used Car Buying Consumer Reports worst cars