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Nissan Quest under investigation for inaccurate fuel gauges

After receiving 12 complaints in the last 14 months, the National Highway Traffic Safety Administration has begun a preliminary investigation into a fuel gauge issue with the 2007 Nissan Quest. Drivers have reported that the fuel level gauge will show there's gas in the tank when there actually isn't - in two cases, the digital distance-to-empty gauge indicated more than 70 miles of remaining range - and it will stall out.
This is the second time the 2007-model-year Quest has been involved in the same fuel gauge issue. In 2010 Nissan recalled seven models, including the Quest, from the 2005-2008 model years because of faulty fuel readings. The 12 vehicles in this latest complaint could have slipped through the cracks then, but we'll find out more when NHTSA updates its progress with the investigation into the estimated 37,656 units.

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.

Nissan e-NV200 electric taxi comes to Amsterdam

Amsterdam's Taxi Electric liked its two-plus years with an all-Nissan Leaf electric vehicle fleet so much that it just got bigger, or at least with its vehicle choice. The company, which says it's the first private-taxi outfit to boast an all-electric fleet, is going to start adding Nissan e-NV200 electric compact vans to its stable of vehicles. The company started out with its Leaf fleet in late 2011 and has since put about a million miles on the 25 EVs. Nissan said in January that the new electric van will start being tested by FedEx here in the state and it has already been put through the wringer by FedEx in Singapore, Japan and Germany. Last September, Nissan said it was in the "final development phase" of the electric compact van and would start selling it to the public this year, though it wasn't real specific with details. That month, it was also announced that the vehicle, which uses the same drivetrain as the Leaf, would go into taxi service in Barcelona sometime this year. Nissan representatives didn't immediately respond to a request for more details on when the model would start public sales, how much it would cost and what it's single charge range is. Until we hear back, you can check out the official press release below. This summer Taxi Electric becomes the first taxi company in Amsterdam to adopt the zero-emission Nissan e-NV200 Taxi Electric first 100% Nissan LEAF fleet since November 2011 Pioneering Amsterdam-based company have covered 1.5 million km demonstrating Nissan EVs' quality and reliability AMSTERDAM, Netherlands – Taxi Electric will be the first private taxi company to add the new 100-percent electric Nissan e-NV200 taxi to its green-energy zero-emission fleet. The combination of Nissan's innovative zero-emission technology, in the form of the 100-percent electric Nissan LEAF, and Taxi Electric's ground-breaking city transportation model have been a recipe for success since the start of operation in 2011. Now the two companies have teamed up again to build on this success and take the next step forward by introducing the game-changing all-electric Nissan e-NV200 taxi this summer. Amsterdam-based Taxi Electric operates a fleet of 25 Nissan LEAF vehicles. It was the first private taxi service to switch to a fleet of 100% electric taxis in 2011. The Dutch company's fleet of Nissan LEAFs has now amassed a trouble-free 1.5 million km in taxi operations – proof of the electric vehicle's high quality and reliability.