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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.

Infiniti Q70 adds long-wheelbase model, fresh looks for 2015

After all the work done for the Q50, Infiniti has finally given some attention to its flagship sedan, the Q70 (or, for those that refuse to use the brand's latest nomenclature, the M). While the refreshed sedan sports a few visual tweaks, the big bit of news is that it's the first vehicle in its segment to offer both long- and a short-wheelbase options (keep in mind, both BMW and Audi offer LWBs in China, but not in the US).
Infiniti has stretched the standard car's 114.2-inch wheelbase to 120.1 inches, lengthening the car 7.3 inches overall. Nearly the entire wheelbase increase is dedicated to rear-seat legroom, with a substantial increase of 5.6 inches overall. As for the effect the stretching had on the Q70's looks, well, we actually think it might look better with the longer wheelbase.
It's a nice change of proportions that is complemented by the fresh looks of the facelifted Q70. New head and taillights are the biggest changes, with full LEDs in the back and LED accents in front. There's certainly a bit of Q50 in the front, thanks to both the headlights and the new "double-arch" grille, complete with mesh-finish inserts. In the cabin, material quality looks to remain impressive, with Infiniti's cool silver-dust wood trim being shown off in the press images. Outside of that, interior changes are kept to a minimum.

Infiniti announces pricing for 2014 QX60 and QX70

With the exception of the G37, customers walking into Infiniti showrooms this summer are going to see a bunch of different names pop up as the automaker switches to its new Q-for-car and QX-for-crossover/SUV naming convention for 2014. The first of these renamed models are the 2014 QX60 (which replaces the JX) starting at $41,550* and the 2014 QX70 (which replaces the FX) priced at $44,950* (*prices do not include $995 for destination), and both are on sale now.
Compared to the outgoing models, the new QX60 (seen above, click to enlarge) lineup starts $300 more than the outgoing JX models (base and AWD), while pricing for the QX70 will remain the same as the trio of 2013 FX models (FX37, FX37 AWD and FX50). What is still unclear is how much the all-new QX60 Hybrid model will cost or how much option and package pricing will change, if any. Scroll down for more info on the new QX60 and QX70 crossovers.