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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.

2019 Infiniti QX60 Drivers' Notes Review | Past its prime

The 2019 Infiniti QX60 is a three-row crossover from Nissan's luxury brand. It's based on the Nissan Pathfinder, sharing the same basic platform and powertrain. It sits near the top of Infiniti's lineup, above the new QX50 and just below the body-on-frame QX80. That said, the car-based platform underneath the QX60 means its actually more spacious than its truck-based sibling. Power comes solely from a 3.5-liter V6 making 295 horsepower and 270 pound-feet of torque. All-wheel drive is available, though our tester was a front-wheel drive model. The 2019 QX60 starts $46,795, but our tester has nearly $20,000 worth of options. The $5,000 limited package adds upgraded leather on the seats and steering wheel, dark wood trim, 20-inch wheels and chrome trim on the exterior. The $3,400 proactive package adds safety features like lane-departure warnings, blind-spot monitoring, backup collision intervention and adaptive cruise control. Other options include back-seat entertainment ($2,150), a wifi hotspot ($495) and the $3,500 sensory package (a Bose audio system, ventilated front seats, heated second-row seats, a motion-activated liftgate and a moonroof for the second and third rows). Editor-in-Chief Greg Migliore: I'm immediately struck by the interior. It's quiet and comfortable. The quilted leather on the door panels is almost decadent. Infiniti is really going for it with this kind of interior styling. Some might say it's a little bit much, but generally, I think the company gets it right. Same with the outside. Infiniti tries to make a statement, and this swoopy, creased design is reason enough to buy the QX60. Our tester has the 295-hp V6, which is plenty capable. There's a lot of torque steer with the front-wheel-drive setup. It's kind of fun, but not really the dynamic most buyers are going for it. Overall, I like the QX60. It's big, comfortable, luxurious and powerful. Get AWD, though, as FWD in the snow is a little squirrely in something this large. Road Test Editor Reese Counts: Unlike Greg and Joel, I wasn't bowled over by the interior. I couldn't find a comfortable seating position for the life of me. The bottom cushion wasn't deep enough and the back seemed to protrude out at odd points into my spine. The leather looks and feels OK, but that was my only highlight. The overall interior design looks fat and boring, especially compared to models from Mercedes-Benz and Lexus. Just look at some of the details like the vents and steering wheel.

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.