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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.

Lotus could build production versions of Renault Alpine, Infiniti Emerg-E

As with one of those blockbuster three-team NBA trades that actually improves the fortunes of every team involved, a report in Autocar indicates that Renault, Infiniti and Lotus are in talks that could benefit both manufacturers and enthusiasts. Renault is considering a production version of the devil-in-blue Alpine A110-50 concept but has said that it "probably needs more than the Renault-Nissan Alliance on its own." Enter Lotus, whose Evora platform could supply the running bits for the mid-engined Alpine revival.
That same Evora platform, in range-extended 414E concept form, is the basis for the Infiniti Emerg-E concept. Even though a decision hasn't been made on the Emerg-E's production, it is still being developed and the company has admitted that it "could be built in Britain." For its part, Lotus has said that it's ahead of schedule on the Evora 414E, with its 408 horsepower, 738 pound-feet of torque and 30-mile electric range. Development funds from both Renault and Infiniti could help make all three cars a closer possibility.