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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 will reinvent its models, tech and design language as part of reboot

Infiniti raised more than a few eyebrows when it announced plans to follow a strategy it described as Nissan-Plus. Although this term suggests the brand's image will be dangerously watered down, its chief executive stressed its flag will remain firmly planted in the luxury car segment as he outlined what to expect in the coming years. The executive team led by Infiniti boss Peyman Kargar will reboot the company with a focus on profitability. "Premium brands should bring more money to the company, so that's the objective. We are not at the level we want to be," he told Automotive News. Several new products are on their way, including a crossover with a fastback-like roofline named QX55, and Kargar clarified many future models will ride on an architecture shared with parent company Nissan. It will be compatible with gasoline-powered, hybrid and electric drivetrains. He explained sharing platforms and components is necessary to save money because the company, like its peers and rivals, is spending a small fortune on developing electrified, autonomous, and connected technology. The shift will likely spell the end of the driver-friendly rear-wheel drive platform found under the Q50 and the Q60, but don't expect Infiniti to put its emblem on, say, a Sentra, and call it a day. It will remain a luxury brand. "The objective is to use these assets of the company, and then to reinject the money we are saving into the luxury experience and ingredients of Infiniti. We will put more money into Infiniti's future, but this money will come from the savings in globalized platforms," Kargar explained. The strategy he's outlining is one many of the firm's competitors have already adopted. Lexus, Acura, and Audi all build cars using parts sourced from their respective parent company. Lamborghini's Urus is related to the Volkswagen Touareg under the sheetmetal. Kargar noted every upcoming new model will be defined by an overhauled design language. We don't know if recent concept cars (like the QX Inspiration introduced in Detroit in 2019; pictured) will influence its upcoming vehicles. However, its future cars will offer nicer interiors, more user-friendly infotainment systems, and they'll receive tech features before Nissan's variants get them, which, oddly, hasn't always been the case in recent years. Infiniti's turn-around will start in 2020, when the aforementioned QX55 makes its debut after a brief delay.

Infiniti Q60 Concept previews sexy styling, twin-turbo V6

Okay Infiniti, this was worth the waiting and teasing. Behold, the Q60 Concept, the coupe that foreshadows a future production two-door while also introducing a new family of 3.0-liter, twin-turbocharged V6 engines. It's fair to say we like it very much. Of course, this is not our first unfettered look at the Q60 Concept. Infiniti's final "teaser" image showed off the final product, but now we can analyze it from all angles, including the lovely, almost S-Class Coupe-like rear end and the clean, fashionable cabin. The Q60 Concept's design, particularly in the swoopy profile, comes across as organic and muscular, particularly in the shape of the front fenders and rear haunches. The car's dead front view reveals a few styling details that were overshadowed by the angle of the teaser image, like the interesting ridge that runs from the grille into the powerfully domed hood. A fixed glass roof gives the cabin an open-air feel, while the overall layout is largely reminiscent of the current Q50 sedan, only with cleaner, updated materials that we wouldn't bet on making production. Thin sport seats look supporting and feature quilted leather bolsters, while a two-tone steering wheel spices up the driving environment. Under the Q60 Concept's hood is the same 3.0-liter, twin-turbocharged V6 that was first shown on the Q80 Inspiration Concept from the 2014 Paris Motor Show. According to Infiniti, the direct-injected six-pot will arrive in a production car within the next two years. In the Q60, a seven-speed automatic handles power delivery, although it's unclear if a similar gearbox would be used alongside the production engine. Other notable features on this sleek two-door include Infiniti's Direct Adaptive Steering system and the new InTuition system, which promises a "fully customizable digital environment." Of course, we'll have much, much more on the Q60 Concept tomorrow, when it makes it arrives on the floor of the 2015 North American International Auto Show in Detroit. Scroll down for the full press release from Infiniti. January 11, 2015 Infiniti Q60 Concept: Fusing exhilaration and power - Infiniti's precursor to a high-performance sports coupe - Unique proposition of striking styling and high-output powertrain in a premium package - Previews new family of powerful and efficient engines Hong Kong/Detroit – Infiniti has set out to captivate the imagination and exhilaration of sports coupe fans with the stunning Q60 Concept.