2013 Nissan Altima 3.5 Sl White/tan Sunroof Alloys Leather 4400.0 Miles Demo 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.

Preserving automotive history costs big bucks

$1.8 million is spent each year to maintain GM's fleet of 600 production and concept cars.
When at least two of the Detroit Three were on the verge of death a few years back, one of the tough questions that was asked of Ford, General Motors and Chrysler execs - outside of why execs were still taking private planes to meetings - was why each company maintained huge archives of old production and concept vehicles. GM, for example, had an 1,100-vehicle collection when talk of a federal bailout began.

Nissan raises base GT-R price to $101,770 for 2014

Nissan has announced a few pricing tweaks for the 2015 GT-R, one of which pushes the most basic variant past $100,000 for the first time. The 2014 cost of entry was $99,590, while the 2015 GT-R starts at $101,770.
The GT-R Black Edition, meanwhile, will demand $111,510, up from 2014's $109,300. The GT-R Track Edition retains the $115,710 asking price of the 2014 car. The price increases on the base and Black Edition come with some additional goodies that should soften the blow to pocketbooks, including a retuned suspension that promises a "more sophisticated ride," while LED headlights come standard. Bose Active Noise Cancellation has also been added to the 2015 GT-R, as has a new interior color option on the base model. For a full rundown of new goodies on the GT-R, check out our original post on the 2015 vintage.
Interestingly, the destination charge for the 2015 GT-R has climbed dramatically, from 2014's $1,000 to $1,595 for the latest car. We've reached out to Nissan to see why there was such a big increase, and will update as soon as we have an update.