2002 Infiniti Q45s Sedan 4-door 4.5l 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.

2020 Infiniti QX50 Luggage Test | Not infinity, but enough

The 2020 Infiniti QX50 is a comfortable five-seat luxury crossover that competes with the Audi Q5, Acura RDX, Volvo XC60, Lexus NX and others. If you’re interested in a QX50, itÂ’s probably got something to do with its impressive, technologically advanced VC-Turbo variable compression engine. It also has sumptuous swales of bodywork, a long list of driver-assist and safety features, and a solidly luxurious interior with a two-screen infotainment setup. The window sticker for the QX50 we drove recently in Essential trim says the seats were leatherette; if true, itÂ’s the most buttery fake leather out there. Still, the engineÂ’s the star. If performance is your only consideration, you can also get the VC-Turbo in the Nissan Altima sedan weighing 400 to 500-plus pounds less and at an MSRP starting $7,500 lower, a price spread that quickly expands as you option up the QX50. But if you want the QX50, itÂ’s probably because itÂ’s a crossover. You want to haul stuff. Which brings us to: luggage test. The QX50 has a cargo capacity of 31.1-31.4 cubic feet behind its raised back seat, which expands to 65.1 cubic feet with the rear seats down. That's more than most in its class, and the QX50Â’s cargo hold certainly looks big and usable enough. To test it, I had six roller suitcases at my disposal. Three would need to be checked at the airport, and one of those is particularly mondo (29x19x11, 26x17x10, 25x16x10). Three others were small enough to carry on (24x14x10, 23x14x11, 22x14x9). Several bags have four wheels that protrude and were counted in the dimensions. I lacked access to RiswickÂ’s wifeÂ’s fancy bag. An asterisk to all our luggage tests: Our crack team of test suitcases is empty. I know someone who can seriously overstuff a soft-sided bag, so depending on how you pack, your results may vary. The QX50 didn't arrive with a cargo cover, so that made things easier. My first stab at loading all those bags seemed promising — five out of six bags fit. Two of the big boys on edge, three carry-ons standing up. That would be one bag for every occupant, but hey, we can do better.  Standing them all up was the easy solution. This fits all six bags, and I'm certain they wouldn't fly forward in a hard stop. But the driver's rear view is impeded. I'd be annoyed to look back at this throughout a long trip. That biggest bag is the biggest offender, so can we just lay that one down? Sure, but we're back to just five bags fitting.

Infiniti confirms all-new sports sedan will debut in Detroit

While the automotive world may currently be focused on the Los Angeles Auto Show, those looking to stay ahead of the curve have their sights set farther down the road. One such automaker is Infiniti. On the first of the LA press days, the Japanese luxury brand has announced an all-new model to debut in Detroit this January.
According to Infiniti, an all-new model will be unveiled at the 2013 North American International Auto show. The debut will be accompanied by a performance from world renowned Cirque Du Soleil as well as a live stream simulcast of the event.
It's unclear whether Infiniti will be showing a redesign of the G sedan, which has been spotted testing, or a new sub-G compact performance-luxury four-door. We will know for sure on January 14 when we bring you news form the Infiniti stand.