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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 previews its own Vision Gran Turismo

Every automaker and its parent company is lining up to design its own set of wheels for the GT6 as part of the Vision Gran Turismo program, and this latest one comes from Infiniti. Although nothing in the way of details were disclosed at this point, the two teaser images released today show that, like most of its compatriots, Infiniti's design is for a low-slung, track-focused, two-door sports car. Its long bonnet suggests a front-engined layout, with an intriguingly ovoid windshield framed by raised buttress A-pillars and Infiniti's signature dog-leg rear pillars. The aerodynamic profiling looks suitably advanced for a mythical beast like this one, with deep extractor vents cut into the hood, intersecting side sills running from the front brake vents, an enormous rear diffuser and an even bigger rear wing. More than that we couldn't tell you at this point, but we're sure video racers will enjoy driving this super-Datsun as much as the Nissan Concept 2020 Vision Gran Turismo released back in June.

Infiniti Q30 goes full monty before Frankfurt

Infiniti is finally tearing off the camouflage and showing the world what the Q30 luxury hatchback actually looks like. Set to make a full debut Frankfurt Motor Show on September 15, the five-door marks the entry of the Japanese premium brand into the compact hatch ranks. The company's designers did a fantastic job of bringing the major elements from 2013's concept to the street, though. Like the earlier design, the production Q30 wears Infiniti's rounded rectangle grille and a chrome strip along the edge of the hood. The headlights are also left squinting from the concept. The only major change to the front end is an adjustment to the lower air dam to make it a little more realistic for production. Sadly, Infiniti is only providing this single front three-quarters perspective on the upcoming five-door for now, but check out the C-pillar in the background to spot the similarly pointed design there, as well. The changes are actually more noticeable when comparing the Q30 with its platform-mate, the QX30 compact crossover concept. The hatchback noticeably softens many of the CUVs swoopy lines to be a bit more mainstream. This is especially true along the front where the big air intakes from the QX are made significantly smaller. Production of the Q30 is slated to start in Sunderland, England, by the end of the year. They should actually arrive in showrooms there before the calendar runs out. Still, we're looking forward to Frankfurt for a more complete view of Infiniti's little luxury hatchback. Related Video: INFINITI Q30 PREMIUM ACTIVE COMPACT SET FOR FRANKFURT IAA 2015 PREMIERE Daring, expressive design meets advanced ride and handling performance Category-breaking Q30 faithful to 2013 concept car World premiere for global media September 15th at Frankfurt Motor Show Hong Kong – The first ever Infiniti Q30 Premium Active Compact is ready for its world premiere at the International Frankfurt Motor Show in September this year. Featuring Infiniti's iconic design language, the all-new Q30 represents a category-breaking vehicle concept developed for customers seeking urban individuality. Its dynamic drive characteristics provide for Infiniti-typical confident and responsive performance as well as excellent ride and handling. Crafted trims and expressive interiors extend the striking design approach from the exterior into the passenger cabin.