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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.

Recharge Wrap-up: Zero to debut 2015 lineup, Nissan extends New Mobility carsharing in Japan

Nissan is extending its carsharing service in Yokohama, Japan for another year. The service, called "Choimobi Yokohama," will use data gathered during its first year to make improvements going forward, including new payment options. The one-way service provides users zero-emission driving with Nissan's New Mobility Concept EVs. Nissan will scale back the number of vehicles from 70 to 50 for the second year. As of September 15, membership was at 10,651 users. Read more in the press release, below. In other Nissan news, the company has a new ad showcasing the benefit of the Leaf's available torque. The video depicts one of the fun parts of driving an EV, which is having 100 percent of the torque available from zero rpm, and shows a Leaf driver pulls away quickly from a stoplight in an impromptu drag race. The ad finishes by reminding Leaf drivers to "use your torque wisely." Watch it below. Analysts predict a booming EV charging infrastructure in South Korea. Government subsidies will encourage this rapid expansion, as the Ministry of Environment South Korea has a plan to fully fund level 2 chargers, plus the installation fee for DC chargers. The availability and shorter charging time of these stations are likely to help convince people to adopt EVs, as well. Analysts at Frost & Sullivan predict 90,000 charging stations around the country by 2020, as you can see in the press release below. Zero Motorcycles is set to debut its 2015 line of electric motorcycles. They will first be unveiled at Intermot in Cologne, Germany beginning September 30. The new all-electric models will then see their US launch at AIMExpo in Orlando, Florida beginning October 16. Zero Motorcycles VP of Global Marketing Scot Harden says, "We are confident that the new line will exceed expectations and look forward to seeing how the motorcycle world responds." Read more in the press release, below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Nissan Extends its Groundbreaking 'Choimobi Yokohama' Car Sharing Service for Another Year YOKOHAMA, Japan (September 19, 2014) - Nissan Motor Co., Ltd and the City of Yokohama revealed today that they will extend the one-year trial run of the first large-scale One-way Car Sharing Service in Japan, called "Choimobi Yokohama," for another year. The service, which kicked off on October 11, 2013, features Nissan's New Mobility Concept electric vehicles.

10 of 18 midsize SUVs earn 'good' IIHS side impact safety rating

It's not terribly surprising that midsize SUVs earned better safety ratings than small SUVs in the latest side-impact tests performed by the Insurance Institute for Highway Safety (IIHS). Just how much better they scored, on the other hand, certainly raises an eyebrow. Ten out of 18 midsize SUVs earned the highest rating of 'good' in the stringent new test, altered for vehicles starting with the 2020 model year with a heavier barrier (4,200 pounds) that moves at a higher speed (37 miles per hour) and is fitted with a hard honeycomb frontal structure. By way of contrast, just one out of of 20 small SUVs earned a 'good' score.  SUVs that receiving 'good' scores were the Ford Explorer, Infiniti QX60, Lincoln Aviator, Mazda CX-9, Nissan Pathfinder, Subaru Ascent, Toyota Highlander, Volkswagen Atlas, Volkswagen Atlas Cross Sport and Volkswagen ID.4. For EV fans, it's worth noting the ID.4 was the only electric vehicle included in the test. The Buick Enclave and Chevrolet Traverse scraped away with 'acceptable' ratings while the Honda Passport, Honda Pilot, Hyundai Palisade, Jeep Wrangler 4-door, Kia Telluride and Nissan Murano were deemed merely 'marginal' in the tough new test. Only two models — the Mazda CX-9 and Volkswagen ID.4 — earned a "Good" rating in every test category.  Interestingly, the Jeep Wrangler would have scored a 'good' rating if it were equipped with side airbags for the rear seating positions. It would likely be an engineering challenge to equip its removable top and/or doors with airbags, but the lack of that safety feature allowed the head of the rear passenger dummy to hit the vertical support of the top. Otherwise, the Wrangler scored good ratings across the board. The new Ford Bronco, which makes more allowances for side-impact safety, has not yet been tested.  The popular Hyundai Palisade and Kia Telluride SUVs stand out in the test with 'poor' ratings for driver pelvis injuries. The Nissan Murano, a vehicle last redesigned for the 2015 model year, was the only vehicle tested that received a 'poor' rating for its structure and safety cage. Videos of the tests of 12 of these 18 SUVs can be found on the IIHS' YouTube page. Related video: Green Buick Chevrolet Ford Honda Hyundai Infiniti Jeep Kia Mazda Nissan Subaru Toyota Volkswagen Safety Crossover SUV IIHS Insurance Institute for Highway Safety