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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.

Edmunds ranks the best used cars for 2013

When people ask us what car we would recommend for them, it's usually not easy to answer. To make a useful recommendation we must consider which of the numerous vehicle segments fits their needs best, and then choose one of the many vehicles offered in each segment. For some people, new cars don't meet their expectations of value, because they lose so much of it the moment they are purchased and driven off the dealer lot. For them, there's always the used-car market, where great deals can be found, but cars' histories of reliability and maintenance records - and perhaps that Certified Pre-Owned warranty - become ever-important factors playing into purchase choice.
To help out, Edmunds has done us the favor of assembling a list of the best used vehicles money can buy, covering model years 2006-2011, according to what it considers the most important criteria when shopping for used autos: reliability, safety, value and availability. That means unreliable, unsafe, super-expensive or limited-edition models don't appear on the list, but instead cars from each segment that are more likely to satisfy the general population.
There are some real goodies on the list, including but not limited to vehicles such as the capable Honda Fit, the cultish Honda Accord coupe (which can be had with a 240-horsepower V6 and a six-speed manual transmission some years), and the powerful Chevrolet Corvette. While Edmunds' choice of the Volvo C70 for best used convertible baffled us at first (not that it's a bad car), it redeemed itself by stating that the Mazda MX-5 still is an unofficial top choice if you don't require more than two seats.

Infiniti shows Q30 interior ahead of Frankfurt debut

Infiniti is supposed to debut the all-new Q30 hatchback at the 2015 Frankfurt Motor Show, but as the show is still a couple of weeks away and the company has elected to release yet another image, we aren't sure there'll be all that much to see come Sept. 15. With that in mind, then, we give you the first images of the entry-level hatch's cabin, and they're, um, wow. We knew the Q30 had a lot in common with the Mercedes-Benz A-Class but as these images show, this is far more than a common platform. The steering wheel, instrument cluster, switchgear, and shifter are direct from the Mercedes parts bin. From the looks of the images, the Q30 will even have a Mercedes-style key. This might not garner much attention in the budget ranks – take the Scion iA and Mazda2, for example – but this degree of parts sharing in the premium market is sure to raise some eyebrows. It's also a rather bewildering move for Infiniti. The company is, in effect, selling a Mercedes-Benz to any new customers it attracts. That'll certainly make a Q50 a hard sell when it comes time for an upgrade. Now, in Infiniti's defense, there are some differences in the layout here. The triple nozzle-style HVAC vents have been replaced with a more conventional pair of outlets, and the instrument cluster hood extends over the built-in navigation screen. That design decision, in particular, will certainly appeal to critics of the tacked-on-tablet look offered by Mercedes. The analog buttons for the multimedia system have also been tweaked, with the result looking far cleaner than the mess of buttons offered on Mercedes' products (we wouldn't be shocked to see this layout arrive on a facelifted A-, CLA-, or GLA-Class in the near future, though). Beyond those changes, though, there are multiple Mercedes design hallmarks here, including the location of the controls for the seat adjustments. You can check out the Q30's cabin in both right- and left-hand drive varieties courtesy of the images above. And for comparison's sake, we also included our most recent gallery of the Mercedes-Benz GLA-Class at the bottom of the page. Have a look and be sure to scroll down for the official press release. September 1, 2015 Countdown Frankfurt: First ever Infiniti Q30 active compact opens its doors before world premiere ? Q30 – The first global Infiniti compact ? Q30 interior design echoes daring expression of exterior ?