2014 Nissan Altima 2.5 Sv on 2040-cars

Auto blog

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: No Tesla Gigafactory deal with California, BMW i3 recalled

Before the Nevada announcement was hinted at, a deal to incentivize a Tesla Gigafactory in California fell through. Tesla was looking for around $500 million in incentives, which the California Governor's Office of Business and Economic Development was willing to offer in tax breaks along with making the permit and environmental processes easier. According to Senator Ted Gaines, there still remained "a gap between what Tesla wanted and what California was willing to offer," the contents of which were undisclosed. California could still be chosen for another of Tesla's battery plants, should those ever materialize. Read more at The Desert Sun. The California Air Resources Board (CARB) will consider allowing a bit of compliance flexibility to its Zero Emission Vehicle (ZEV) regulations for some automakers. CARB will hold a hearing to discuss giving intermediate volume manufacturers (IVMs) - carmakers that do between 4,501 and 60,000 new vehicle sales in the state - some leniency catching up to the larger manufacturers when it comes to clean vehicle production. The ZEV regulation changes take into account the amount of revenue IVMs have available for developing the cars, particularly plug-in hybrids. Read more at Green Car Congress or see the notice from CARB here. Certain units of the BMW i3 are subject to an airbag recall. For cars built March 31, 2014, the passenger airbag inflator may have been assembled incorrectly, which could keep it from deploying when needed. Owners will be notified by BMW, and the problem will be fixed for free. The recall also affects certain 2014 Mini Cooper models. Learn more at the NHTSA website. The Renault-Nissan Alliance is providing 200 electric vehicles to telecommunications company Orange in France. The cars, which will include the Nissan Leaf, Nissan e-NV200, Renault ZOE and Renault Kangoo ZE, will be used mostly for carsharing. Through the program, Orange employees can book a car for work or personal travel using a smartphone. The Alliance will also help Orange install charging stations for the new cars. The addition of the EVs to the fleet will help Orange achieve its goal of reducing its carbon footprint by 20 percent by 2020. Read more in the press release, below. Jianghuai Automobile Company (JAC) is delivering its first 100 EVs to the US. The shipment is part of a larger order of 2,000 cars to be sold by GreenTech Automotive in the US market. Read more at ECNS.

2015 Nissan GT-R updated with new lights, more refined ride

The Nismo version of Nissan's high-tech supercar may be getting most of the headlines today, but we shouldn't forget that the car on which it's based, the garden-variety GT-R, has been significantly updated for 2015, as well.
What Nissan engineers focused on for the new model year was making the GT-R a more well-rounded GT car. That means dialing some more compliance into the car's very firm suspension for a more comfortable ride, as well as lightening up the steering at low speeds to make urban maneuvering easier. The braking calibration has also been changed to be more linear and smooth when slowing from normal, everyday speeds. Does this mean the GT-R has gone soft? We'll reserve judgment until we drive it, but Nissan claims the new refinements giving the car "multi-dimensional performance."
The GT-R also gets new lighting technology for 2015, including multi-LED headlights that lend the car a new light signature at night, and the LED taillight rings are now complete circles instead of rings of dots. The headlights are also now controlled by an Adaptive Front Lighting System, which sounds similar to other systems that aim light where the car is being turned, but Nissan's system adjusts the angle of the lights depending on vehicle speed - at higher speeds the lights are angled to project their illumination further.