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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.

Meet the Nissan GT-R test driver responsible for 'Ring tuning

Ever wonder what it's like to be a manufacturer's development driver at the Nürburgring? We imagine it's pretty cool. After all, you get to spend your days zooming about the greatest racetrack on the planet in a vehicle that is usually months or more away from consumers. For Hiroyoshi Kato, whose actual title is Technical Meister, life is even better than your typical development driver, because he spends his days wringing out the Nissan GT-R Nismo around the Green Hell.
Kato-san has a long history with both Nissan and the Ring. He had a major hand in the development of the R32, R33 and R34 Skyline GT-Rs, having first come to the Ring nearly three decades ago.
His experience with the Nismo, though, is different than the other vehicles he's contributed to. As he explains it, there are real racers on hand to test the car on the track, like Formula One reserve driver Sébastien Buemi. Instead, Kato focuses on the track-to-road balance. Still, he has some truly interesting insights on the car and the track, including his surprise at turning a sub-eight-minute lap in his first outing. That, along with a few other things (one of which is an R34 being hustled about), make this a must-watch video from Nissan.

Nissan Rogue Detour uses Google Maps to go create virtual test drive from your doorstep

The best way to evaluate a new car before you buy it is to test drive it. All of the specs and reviews in the world cannot communicate how a car suits you as well as a few minutes behind the wheel. Interesting, then, that according to Nissan, the average buyer spends twice as much time researching new cars online than they do at dealers. To market its new 2014 Rogue, Nissan has launched an online marketing experience aimed at bridging that gap. Called The Detour, it combines Google Street View and Google Maps to give you a custom-tailored virtual test drive. The neat, uniquely interactive part about Detour is that it allows you to specify a starting and ending location. Thus, you can use the microsite to 'show' the Rogue on your commute, or your favorite stretch of tarmac. To spice things up, Nissan has added some digital effects and set the experience to a song by British rapper M.I.A. Detour seems to work better on shorter journeys, because it snips out some portions of the route in order to keep the experience from running too long. If you're going to try it out, we suggest using a crosstown journey rather than going cross country. Scroll down to get all of the details on the Rogue's latest marketing campaign, or click here to try it out for yourself. Nissan Takes 2014 Rogue Shoppers on Cinematic "Detour" with New Google Maps-Based Virtual Test Drive Feb. 4, 2014 – New Online Campaign Shows How Nissan Rogue Makes Every Drive More Exciting – NASHVILLE – Nissan today launched "The Detour," an exciting virtual driving adventure in support of the ongoing rollout of the all-new 2014 Nissan Rogue compact SUV. Available now at nissanusa.com/the-detour, The Detour utilizes Google® Street View, Google® Maps and Google® Satellite API – along with Hollywood-style digital effects and a soundtrack from recording artist M.I.A. – to create a custom test drive experience starting from anywhere around the world. "Recent studies show that new car buyers today spend nearly twice as much time researching their purchases online than at dealerships – more clicking than kicking the tires, so to speak. So why not bring the two together with an informative and enjoyable test drive in buyers' own neighborhoods?" said Jon Brancheau, vice president, Nissan Marketing Communications & Media, Nissan North America, Inc.