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Infiniti Q Inspiration Concept shows a future with variable compression

For weeks, Infiniti has been teasing the Q Inspiration Concept ahead of its official debut at the Detroit Auto Show. Details were absent, but the design was clean, swoopy athletic. Not seeing any tailpipes on the rear end, we hoped it could sport some kind of electrified powertrain, but surmised that Infiniti could take the opportunity to further showcase its variable compression turbocharged engine technology. Now, Inifniti has officially taken the wraps off its Q Inspiration Concept, and has indeed chosen to use the stunning show car to demonstrate "near future applications" of the potent yet efficient VC-Turbo tech. VC-Turbo made its production debut in the 2019 QX50 at the 2017 Los Angeles Auto Show. Here, in the Q Inspiration, VC-Turbo allows Infiniti designers to make the most of the packaging, taking advantage of the compact powertrain to increase the size of the cabin while maintaining the footprint of a mid-size car. Electric automakers like Fisker, Lucid Motors and the like have been doing something similar with electric powertrains, but Infiniti's VC-Turbo allows the company to do something similar with technology that is ready for primetime, while still bridging the gap to more efficient future powertrains. VC-Turbo, as we've learned earlier, allows the engine to change and optimize compression ratios on the fly, between 8:1 for high-performance situations, to 14:1 for maximum efficiency. Mounted to the exhaust manifold integrated in the cylinder heads of the four-cylinder engine is a single-scroll turbocharger. The system, says Infiniti, provides the torque and response of a hybrid or turbodiesel powertrain without sacrificing efficiency. In the Q Inspiration, the power is directed to four wheels via a front-biased all-wheel-drive drivetrain. The system can direct torque to the rear wheels individually as needed. As a design study, the Q Inspiration is a success. The proportions and lines are sleek and attractive, accentuated by the car's white paint. There's kind of a lot going on up front, with a large "double-arch" grille at the leading edge. Everything behind that, though, looks particularly harmonious. Its elongated cabin and coupe-like dimensions help provide efficiency while maximizing headroom for the four occupants. It's a car that stands up to close inspection, as attention to detail makes it more interesting the closer you scrutinize it, inside and out.

Infiniti's fastback 2021 QX55 crossover shows its stylish rear end

First announced in August 2019, the Infiniti QX55 will finally make its global debut on Tuesday, November 17. Nissan's luxury division released a preview image that gives us the best look yet at the next addition to its range. The QX55 is closely related to the QX50 crossover under the sheetmetal, but it stands out from its more family-friendly sibling with a rakish, fastback-like roofline that will inevitably attract the coupe label. It will be to the QX50 what the BMW X4 is to the X3. Although we haven't seen its front fascia yet, Infiniti's preview image shows the rear end wears horizontal LED lights that stretch deep into the quarter panels, along with a roof-mounted spoiler. We were pleasantly surprised by the QX50's upmarket interior, so we're expecting a comparable degree of opulence in the QX55. It's too early to tell if Infiniti will simply copy the 50's cabin layout and paste it inside the 55, or if the latter will receive a look of its own. Similarly, technical specifications won't be published until the model's introduction. We expect that the VC Turbo four-cylinder engine, which was a finalist for the 2019 Autoblog Tech of the Year award, will appear on the roster. All-wheel drive will certainly be available, and Infiniti may offer an entry-level variant with front-wheel drive. Infiniti will present the 2021 QX55 online Tuesday during an event that will star singer Aloe Blacc. It will stream the concert-unveiling cross on its various social media platforms starting at 8:55 p.m. Eastern time, 5:55 p.m. Pacific time. Built in Mexico, the model will arrive in American showrooms in early 2021 with a base price pegged above $40,000. What's next? The QX55 will stand out as the first model released under Infiniti's Nissan-Plus strategy, which was presented as a way to cut costs and boost profits by increasing the number of components it shares with its parent company. However, leaning more heavily on Nissan will not dilute its image or its products, according to executives. Stylists are in the process of overhauling Infiniti's design language, and the brand's reboot will put a major emphasis on technology. Looking ahead, the QX will be followed by the next-generation QX60, which is tentatively due out in 2021 as a 2022 model, and by the company's first series-produced electric car. Related Video:

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.