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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 gets boiled down to four P's: Performance, passion, precision, provocation

So then we asked, "Well, what does that mean?"
We met Andreas Sigl, the global director of Infiniti's Formula One involvement (that's him above on the right), at the US Grand Prix in Austin last year, and our questions to him were aimed at understanding what Infiniti was doing and where it intended to go. In spite of regard for its products and increased sales, few outside - and even inside - Infiniti seemed to have a clear idea of what the brand stood for.

2018 Infiniti QX80 Drivers' Notes Review | Big, brash and big

When it comes to body-on-frame, full-size SUVs, it seems every automaker has the same strategy. Offer one version as a more affordable, workman-like model, and another one as the plush luxury model. Ford has the Expedition and the Navigator, Toyota has the Land Cruiser and the LX 570, GM has the Tahoe and the Escalade. Over at Nissan, the pairing is the Nissan Aramada and the Infiniti QX80. We recently reviewed the Nissan version, and we just had a turn in the Infiniti. So how did the Infiniti fare against its proletarian twin? Read on to find out. Associate Editor Joel Stocksdale: So here's the thing about the Infiniti QX80: It's literally just a flashier Nissan Armada. As I sat down to write my thoughts, I took a second look at what I wrote about the Nissan-badged version, and I realized almost everything on my mind I already covered. The thing is enormous. Walking up to it, it seems like it might be an inch taller than me (5'11"). It's pretty wide, too, and the width is consistent all the way up. But it is still easy to drive with light steering and very good visibility. The 5.6-liter V8 sounds lovely and seems well-matched to the truck, and the transmission shifts smoothly and picks gears well. The real problem I see is that my feelings about the QX80's interior are nearly identical to those of the Armada. They're virtually identical, especially when comparing the higher trim Armadas. They have the same infotainment, the same buttons. There are a lot of buttons, too, scattered seemingly haphazardly and are difficult to use, especially with the very dated infotainment system. The dash design and shape of the wood are the same, and so is the steering wheel. The only things I could tell were really different were the shift knob, the gauge faces and the quilted leather seats. And Nissan offers a version of the latter on the Armada Platinum Reserve. I'm dwelling on this a bit because the Infiniti QX80 is not cheap. The four-wheel-drive one we had here in Michigan had a base price of $68,845. That's a few thousand more than the aforementioned Armada Platinum Reserve, and I don't see how the Infiniti is worth that extra money. It seems all you're getting is a flashier exterior, especially with the $2,800 22-inch wheels, and a more prestigious badge. I need more than chrome and badges to spend so much money. My recommendation is just buy an Armada.