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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 previews its own Vision Gran Turismo

Every automaker and its parent company is lining up to design its own set of wheels for the GT6 as part of the Vision Gran Turismo program, and this latest one comes from Infiniti. Although nothing in the way of details were disclosed at this point, the two teaser images released today show that, like most of its compatriots, Infiniti's design is for a low-slung, track-focused, two-door sports car. Its long bonnet suggests a front-engined layout, with an intriguingly ovoid windshield framed by raised buttress A-pillars and Infiniti's signature dog-leg rear pillars. The aerodynamic profiling looks suitably advanced for a mythical beast like this one, with deep extractor vents cut into the hood, intersecting side sills running from the front brake vents, an enormous rear diffuser and an even bigger rear wing. More than that we couldn't tell you at this point, but we're sure video racers will enjoy driving this super-Datsun as much as the Nissan Concept 2020 Vision Gran Turismo released back in June.

Infiniti Q70 won't live to see 2020

The Infiniti Q70 won’t be returning for the 2020 model year, effectively killing InfinitiÂ’s large luxury sedan. This news comes to us via a report from Motor Authority, citing “the automaker” and Infiniti spokesperson Kyle Bazemore. WeÂ’ve reached out to Infiniti to confirm the news, but it doesnÂ’t strike us as a surprising move whatsoever. Update: Infiniti confirmed the Q70 won't be sold in the U.S. or Canada for the 2020 model year. Back in July of this year, Nissan made it clear that we should expect 10 percent of its models to be cut from its global product lineup. We speculated then that the Q70 and Q70L would be part of these cuts, as itÂ’s the manufacturerÂ’s worst-selling model. To no oneÂ’s surprise, that eventuality came true. Infiniti moved 4,479 Q70s and Q70Ls in 2018, making it a super low-volume vehicle in a tough segment. Back in the mid-2000s, Infiniti topped 20,000 sales of its largest luxury sedan (not named the Q70 at the time). Cars like the Mercedes E-Class, BMW 5 Series and Audi A6 are all more enticing buys next to the aged Q70 — a slightly cheaper base price was the last stand for this vehicle, but it looks like a good deal wasnÂ’t enough to save it from our crossover apocalypse. Infiniti SUV sales are up, as the QX80 continues to gain more ground in 2019. More folks are opting for the raised and rugged options than smooth and comfortable sedans across the industry, which is why we continue to see news like this. Unfortunately, the Q70 isnÂ’t riding off into the sunset in any sort of glory. We can trace the Q70Â’s lineage back through a few name changes (Q45 into a series of M cars like the M45 and M56). Its oldest ancestor would be the Infiniti Q45, which was a revolutionary car back in the early 1990s. It featured an active hydraulic suspension system that aimed to provide a supremely comfortable ride and flat cornering at the same time. When equipped with the suspension system, hydraulic actuators on each wheel were able to counter the forces exerted on it from cornering, braking and acceleration. And remember, this was 1991!  Transitioning back to today, Nissan and Infiniti have made it clear that EVs will be the future. We know that weÂ’d love to see another industry-changing flagship sedan from Infiniti, and a fully electric vehicle might just be the way to go about it. Anybody wanting for a production version of the Q Inspiration Concept?