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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.

2021 Infiniti QX80 gets simultaneously more and less expensive

Infiniti has released pricing for the 2021 QX80, and the brand's range-topping SUV sails into the new model year with revisions to its trim lineup and minor equipment changes. The starting price of the QX80 rises, but the asking price for the fanciest version is lower for 2021. The entry-level QX80 is again the Luxe, and in rear-wheel-drive form, it starts at $70,445 (with $1,395 destination) or $73,545 with all-wheel drive. Both figures represent an increase of $2,300 over 2020. A new middle-level trim is the Premium Select, and it steps in for last year's Edition 30 model, featuring that version's dark-chrome exterior accents and 22-inch wheels. Prices for the QX80 Premium Select are $74,745 (RWD) and $77,845 (AWD), which are $3,100 more than last year. For those with a hankering for the very finest of QX80s, however, the news is better. In place of last year's Limited, the new range-topper is the Sensory, which includes Infiniti's Hydraulic Body Motion Control System. The Sensory is $81,595 with rear-wheel drive and $84,695 with AWD. And while that's not cheap, it's some $8,000 less than what Infiniti was asking for the 2020 Limited. The big tech news for 2021 is the Infiniti's rear camera mirror has higher resolution and a larger viewing surface. Previously standard on the top trim, it's now included on all models. Last year saw the arrival of larger display screens in the dash and the instrument cluster. No changes are on hand in the engine room, where the QX80 continues to be motivated by Nissan's 5.6-liter V8 that makes 400 horsepower and 413 lb-ft of torque, dispatched by a 7-speed automatic transmission. The 2021 Infiniti QX80 is on sale now. Related Video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.    

Assessing Sebastian Vettel's first 100 days as Infiniti's director of performance

Whenever a new US president is elected, we know to expect a performance review as soon as he (or she) has spent 100 days in office. Sebastian Vettel, arguably given a job that is more important to Infiniti than the US president, has been the brand's director of performance for one hundred revolutions of The Blue Marble, and Infiniti has put together a videographic glimpse of his work at Paul Ricard, in the US and England.
We probably won't really get a grip on the full results of his efforts for a while - we doubt that he's been in his post long enough to significantly alter the trajectory of the Q50 sedan, for instance. But then again, Infiniti insists he's been integral to the car's dynamics development regime, suggesting he's been working as a test driver for some time before these 100 days. Of course, Vettel is a race car driver and brand ambassador first and foremost, but when he tells a Q50 engineer that "For the future, I think it's more comfortable to have the shift paddles on the steering wheel," we get the sense that he won't hesitate to suggest changes in forthcoming products. Check out more of his inputs in the video below as well as a press release detailing his visit to the tech center in Cranfield, UK.