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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.

Mystery shoppers love Infiniti, hate Tesla

Infiniti, followed by Lexus tied with Mercedes-Benz took the top two spots for best sales experience according to mystery shoppers from the latest Pied Piper Prospect Satisfaction Index, while EV manufacturer Tesla recorded the lowest overall score. Not surprisingly, premium brands dominated the top ranks. Including the three already mentioned, luxury brands occupied seven of the top ten spots and included Audi, BMW, Porsche, and the only American brand to crack the upper echelon, Cadillac. Toyota, Volkswagen, and Nissan rounded out the first ten positions. The news for domestic automakers isn't good. Aside from Caddy, the only other star-spangled automaker to score above the industry average is Chrysler. The rest of FCA, most of GM, and all of Ford fell below the line. But Pied Piper's mystery shoppers handed Tesla the biggest walloping – the company is ten full points below the next lowest brand, Volvo, and its score of 86 is 17 below the average of 103. It's baffling, considering the company's touted direct-sales model. "Tesla leaves me scratching my head," Fred O'Hagan, Pied Piper's president and CEO, told Wards Auto. "They own all of their stores, so you would think each one would be doing the same thing. But they're not. Tesla is consistent in its inconsistencies." O'Hagan added that there's a "huge variation" in Tesla's store-to-store effectiveness, and that in some cases, shoppers found showroom workers that acted more like "museum curators," Wards Auto reports. It might be popular to call Tesla the Apple of the car world, but based on Pied Piper's work, the brand has a long way to go to emulate the uniform shopping experience of an Apple Store. The news might be bad for Tesla, but even for the brands that scored below average, there's cause for celebration. Only Tesla and Mini lost points in this year's rankings, and only Mercedes and Lincoln held steady. Every other brand, including Infiniti, which topped the index for the first time, gained at least one point. The biggest improvements belong to Porsche, Land Rover, and Mitsubishi, which all jumped five points. Pied Piper's annual Prospect Satisfaction Index uses mystery shoppers – over 6,100 this year – from across the country to assess dealers and generate rankings from over 50 individual factors. News Source: Pied Piper via WardsAuto Green Audi BMW Cadillac Chrysler Infiniti Lexus Mercedes-Benz Nissan Tesla Toyota Car Buying Car Dealers study

Recharge Wrap-up: Nissan reveals GT-R LM Nismo, NRG plans eVgo expansion

Nissan has officially revealed the GT-R LM Nismo LMP1 car. The hybrid Le Mans racer uses a biturbocharged 3.0-liter V-6 up front to power the front wheels, plus a kinetic energy recovery system for an extra boost. Football fans likely caught a glimpse of the car in Nissan's With Dad commercial that aired during the Super Bowl, but the company has a couple more videos that show the car off quite well provided below. "This is innovation that excites," Says Nismo president Shoichi Miyatani. "Sustainability is at the top of our agenda, and the technical regulations for Le Mans give us the freedom to pursue new ideas in this area." Read more at Green Car Congress, or in the press release below. The NRG eVgo charging network now operates 120 DC fast charging stations in California. 60 of those are "Freedom Stations," offering both CHAdeMO and CCS charging cables, and 52 more of these are in the works. NRG plans to expand the eVgo network to 25 US markets in the next two years (up from the current 10), including chargers in Tennessee, as well as linking cities along the near entirety of the East and West coasts. Read more at Green Car Reports. Tesla has opened its 20th Supercharger station in the UK. The company says it will offer full UK coverage by the end of 2015. As of now, the Supercharger network extends as far north as Edinburgh, southwest to Exeter, and to Maidstone in the southeast, which is just up the road from access to mainland Europe through the English Channel Tunnel. Tesla operates more than 1,600 Superchargers worldwide at over 300 stations, with 129 stations and more than 670 Superchargers in Europe. Read more at Hybrid Cars. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Nissan reveals Le Mans challenger during Super Bowl - First glimpse of race-ready Nissan GT-R LM NISMO during Super Bowl XLIX - Innovative new LM P1 racing car is like no other Le Mans car - TAG Heuer, Motul and Michelin revealed as Nissan LM P1 partners YOKOHAMA, Japan Í– Nissan today declared itself ready to take on the world's best sports car manufacturers after revealing a glimpse of its Le Mans challenger – the Nissan GT-R LM NISMO – during the commercial break for Super Bowl XLIX. Last year's Super Bowl was the most watched television program in U.S. television history with over 110 million viewers.