2014 Nissan Altima on 2040-cars

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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.

2015 Nissan Altima pricing released, V6 gets MPG bump

Nissan has announced a range of moderate enhancements for its 2015 Altima sedan, starting with a one-mile-per-gallon increase in the highway fuel economy of the top-tier, 3.5-liter V6 engine. The six-pot now returns 32 mpg on the highway and 22 mpg in the city.
The 3.5 SV and 3.5 SL, the mid and top-end six-cylinder trims, also get NissanConnect with Navigation, blind-spot monitoring and lane departure warning. Prices, though, see a commensurate increase.
The starting price for a base, 2.5-liter four-cylinder Altima has been nudged up by $130, to $22,300, not counting the $810 destination charge. The 2.5 S model is down $130, though, to $22,560. Meanwhile, the top-end four-cylinder models, the SV and SL see their prices increase by $380 and $230, respectively.

Nissan shows self-cleaning car coated in nano paint

Washing the car is an activity like mowing the lawn that some people love and others find to be an absolute chore. For the latter group, Nissan may have an answer. Nissan is testing a nano-paint coating that could make the car wash a very infrequent place to visit.
Shown on a European Note hatchback, the key is a special layer of super-hydrophobic and oleophobic material called Ultra-Ever Dry that is sprayed over the paint. It creates a protective layer between the body and environment, and it means that when dirt or water come into contact with the car, the gunk just sheets away.
Nissan admits that the coating is still early in testing. The key will be if the stuff can actually last for the long term, and the company will be analyzing it over the coming months to see how it will react in different conditions. At the moment, the automaker has no plans to offer Ultra-Ever Dry as a standard feature, but it may make it available as an aftermarket addition in the future. Scroll down to watch the video of Nissan testing the stuff in some very dirty conditions.