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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 Q50 steer-by-wire system took 10 years to develop [w/video]

Infiniti's Direct Adaptive Steering (DAS) is quite a novelty - the system employs no physical connection between the steering wheel and the front wheels under normal circumstances and instead relies on a computer, clutch and steering-angle actuator to guide vehicles down the road with input from the driver.
In our First Drive review of a 2014 Infiniti Q50 equipped with the system, we weren't overly impressed by the artificial feedback. But we can't help but be impressed with how long Infiniti spent on its development: a full 10 years, according to Autoline Daily in the video report below. A staggering 70 percent of the research and development time spent on DAS was devoted to getting the steering feel right, and unfortunately, our first impression suggests their results still leave something to be desired, as we found it lacked the sporty feeling a sport sedan should have.
The weight of DAS is comparable to that of a conventional steering system due to its complexity. For example, three ECUs are used in the first-generation DAS system to ensure there's never a loss of steering, but Infiniti is refining the technology and is working to simplify it to reduce weight. One day Infiniti hopes that only one ECU will be needed to control DAS. We just hope it doesn't take the Japanese automaker another ten years to get the steering feel right.

Infiniti Q60 dies at year's end

In 2021, Automotive News' Future Product Pipeline coverage for the Infiniti brand contained a single entry for 2023: "Infiniti Q60 ends in 2023." Turns out the report of the Q60's death was true; the brand confirmed to Car and Driver that the coupe ends production at the end of this year. We wish we were surprised at the news or the rationale. An automaker spokesperson told the magazine, "We are focusing on the most popular luxury automotive segments such as crossovers and SUVs, as well as the upcoming EV we recently announced that will be built here in the U.S." The official justification didn't address the fact that dealers sold 2,728 units of the Q60 in the U.S. last year, 64 units fewer than achieved in 2020, and 2,315 units fewer than dealers moved in 2019 — the year Q60 sales fell off a cliff after selling more than 9,000 units in 2018. Consider this another step in the "three-phase company transformation" that Chairman Peyman Kargar is in the second stage of working through. The first phase of recovery ended this March, the luxury automaker getting back to profit globally. The current second stage that will revamp, electrify, and expand the lineup is predicted to last for the next four years. The spearhead will be the new QX80 SUV, planned for late next year or early 2024 with ambitions to challenge the Cadillac Escalade, Lexus LX, and Range Rover. That luxury club barred Infiniti from entry awhile ago, so Kargar's talking about profound turnaround. As for the Q60, the shame is that a car with sweet looks and even sweeter power never got the interior or driving dynamics to match. Perhaps the return of a much better Nissan Z can provide fodder for a proper Infiniti coupe once the luxury division has restored its momentum. The spokesperson told Car and Driver that Q60 inventory should last until well into 2023, so anyone looking for a 400-horsepower bargain with a six-speed manual should mark their calendar for early next spring.   Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.