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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.

The 11 best scenes from the 2015 Goodwood Festival of Speed

Over the last three days, the Goodwood Estate has played home to the eponymous Festival of Speed. Thrown by the biggest gearhead in the British aristocracy – Charles Gordon-Lennox, the Earl of March and Kinrara – the Festival of Speed is essentially a tremendous, gasoline-fuelled party, complete with a very large lawn sculpture, that features the world's hottest, weirdest, fastest, and loudest race, production, and historic models. While there are quite literally dozens and dozens of videos from the event – not to mention the full-day replays (of which only day one is available, at present) – we've sifted through them to pluck away the very best. There's stuff from the official Goodwood YouTube channel, as well as several videos from automakers and other third-party channels, and it's all available below. 2015 Ford Mustang GT350R Looks Barely Controllable If you thought the highest-performance Ford Mustang would somehow get more tractable or civilized once it moved to an independent rear suspension, this video shows you have nothing to worry about. Watch as an unnamed driver wrestles the new Shelby GT350R and its flat-plane, 5.2-liter V8 up the hillclimb circuit. Even with the new suspension and sticky tires, this Mustang wants to go any direction but straight, especially following its launch. 2016 Ford Focus RS, Is Very Loud, Blue Ken Block makes his first appearance on our list. Before he steps into his Hoonicorn Mustang, though, the Gymkhana expert tackled the hill in the all-new Focus RS. The vicious bellow of the 2.3-liter, turbocharged four-cylinder is the star of this commentary-free video, although the gorgeous Nitrous Blue paint job is a nice accompaniment, as well. 1965 Ford Mustang Hoonicorn Runs Hill, Nearly Kills Lord March Mr. Block's two runs behind the wheel of the Hoonicorn were, unsurprisingly, very eventful. While one attempt goes off without a hitch, seeing the American rally driver slip and slide his way to the top of the hill while taking a short break for a donut, the other is slightly more dramatic. Block, along with Lord March in the passenger seat, carries a bit too aggressive an angle into a turn and nearly puts the NASCAR-powered Mustang into the hay bales. Check out the first video above, and the second one below. Kimi Raikkonen Makes Us Miss F1's V8 Era The latest Formula One cars have been maligned for the lackluster noise produced by the new 1.6-liter, turbocharged V6.

Nissan Sentra, Buick LaCrosse to headline LA Auto Show

We're less than a month away from the start of the Los Angeles Auto Show, and automakers have been lining up their debuts for the upcoming left-coast expo. The latest announcement comes from the show's organizers who are eager to tout the global debuts slated for next month. Chief among them will be new versions of the Buick LaCrosse and Nissan Sentra. So far all we've seen of the 2017 LaCrosse is a glimpse at the front grille, but it's already promising to bring elements of the Avenir concept to the street. The original LaCrosse was launched in 2004 and was replaced in 2010 with the current model. The Sentra nameplate has been around much longer, but the current model was launched more recently in 2013. The new version spied recently while undergoing testing is promised to be a substantial update on that model, not a complete replacement, bringing it up to speed with the latest equipment and revised styling. This represents the first official confirmation we've received of when Nissan will be unveiling the new Sentra. Mitsubishi will also be on hand with its new Outlander Sport, as well as the redesigned Mirage. They'll be joined as well by new versions of a couple of high-end models that promise to resonate with the local crowds in tinseltown. Land Rover has chosen the LA show as a suitable venue to unveil the production Range Rover Evoque Convertible that will drop the top on one of the most stylish luxury crossovers on the market. And Porsche, as we know, is gearing up to hit the track with the new Cayman GT4 Clubsport - a customer racing version of the company's little two-seat, mid-engined sports car that's been lightly modified for motorsport competition. Of course these won't be the only new metal on display at the Californian auto expo. They'll be joined as well by the likes of the new Infiniti QX30, Hyundai Elantra, Kia Sportage, and Jaguar F-Pace - many of which we've already seen. Meanwhile companies like Fiat, Ford, Mazda, Mercedes, Subaru, Volvo, Volkswagen, and Elio Motors are keeping their plans under wraps for the time being. But with mere weeks to go, it won't be long before we see what they've got in store as well.