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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 QX Inspiration fails to drive onstage at Detroit Auto Show reveal

Update: The concept car has made it to the stage, and is spinning on its dais. "Ladies and gentleman, the Infiniti QX Inspiration. It's here, but you can't see it," were the words spoken on the Infiniti stage as the new electric concept crossover's promo video ended. That's right, on Infiniti's 30th anniversary of existence — the brand was launched here in Detroit — its big reveal was never actually revealed at the Infiniti press conference. "It's a concept car," Nissan said lamentingly. Yes, it most certainly is a finicky concept car. We walked out of the hall to see the QX Inspiration sitting, with its hood up, unmoving with Infiniti folk milling around it. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. The press conference itself went on without the vehicle, though it was a bit anticlimactic without it. Pre-written lines were read, detailing small bits here and there that nobody managed to see. However, we were determined to see the car, and managed a short glimpse before being told to move along and wait for it to (eventually) make it onto the stage for photos. Check out all the details in our post that went up as Infiniti revealed all the details of the car, minus the actual vehicle. The design is quite striking, with a heavy Japanese tilt both inside and out. Once Infiniti gets it out there (we'll update when they do) we'll have shots of it from the swiveling dais it was meant to grace during the "official" reveal. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Related video: Detroit Auto Show Infiniti Concept Cars Electric Luxury 2019 detroit auto show

2014 Infiniti Q50S

Ten years ago, nearly to the day, I took delivery of a brand-new 2004 Infiniti G35 6MT. The sporty rear-wheel drive sedan, equipped with its throaty 260-horsepower V6, slick manual gearbox and limited-slip differential replaced my 2001 BMW 330i because the Japanese competitor touted a product that was roomier, better equipped, quicker and lower priced. The G35 trumped the German in nearly every measurable category - at least on paper.
The 2014 Infiniti Q50 is the direct descendant, albeit two generations later, of the car I owned a decade ago. It is dimensionally about the same size, but it has gained more than 300 pounds of mass thanks to numerous safety upgrades and technical innovations. The additional weight is largely dismissed by a larger and more efficient powerplant that delivers an additional 68 horsepower, a welcome arrival, but the manual gearbox that charmed enthusiasts has been pushed out of the picture by a mandatory seven-speed automatic transmission.
As it has in the past, Infiniti touts its all-new Q50 as a luxury sport sedan worthy of the title. Decades ago, impressive performance statistics may have sealed the deal. Yet there is much more to the assignment today, as the model must offer premium appointments, sophistication and engaging driving dynamics if it's going to entice and capture the next-generation of young, premium buyers - much like the G35 did for me ten years ago.