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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.

2022 Infiniti QX55 Review | Price, performance, size, comparisons with QX50

Carmakers love calling them coupes, but as they have four doors, that's still a tough sell for our dictionary. So, let's go with fastback SUV for now, and say that the 2022 Infiniti QX55 is one of the best-looking examples of the growing bunch. Even if Infiniti wasn't originally intending to lop off the back of its QX50 compact crossover, the afterthought project to turn it into the QX55 was nevertheless a successful one. When parked next to a BMW X4 or Audi Q5 Sportback, we know the QX55 would do the prettiest job sprucing up the driveway. It's nicely proportioned and tastefully detailed with just a hint of Infiniti's forever cool FX SUV at the rear. The interior is also interesting to behold and pleasing to touch. Unfortunately, the QX55's aesthetics are its main selling point. Driving it is a real letdown as its underwhelming handling and soul-sucking continuously variable transmission just aren’t up to snuff for a luxury model. It makes the QX55 feel like you're driving a Nissan Altima. And even if you're less concerned with a car's driving dynamics, the QX55's odd and antiquated tech interface is sure to be a put-off after seeing what BMW, Audi and Mercedes have to offer. Of course, all of this could be said of the QX50. At least the QX55 has aesthetics on its side.   What's new for 2022? The QX55 is an all-new model, although the QX50 upon which it's based has been around since 2019. 2022 Infiniti QX55 View 25 Photos What's the QX55 interior and in-car technology like? The QX55 interior is a highlight. ItÂ’s lifted from the QX50, and thatÂ’s good. ItÂ’s just as flowy as the exterior, and on our Sensory trim level test car, it was fitted with sumptuous red and black leather on nearly every surface, plus some natural-finish wood trim across the dash and doors. Lower trim models arenÂ’t quite as flashy but still feature the same attractive design. It's all suitably elevated for a luxury car. On the other hand, the dual-screen infotainment system is at best bizarre and at worst antiquated.  Most infotainment functions are accessed and operated via the touchscreen at the bottom of the stack. That placement makes it easy to reach but hard to see. The top screen controls the navigation system and Apple/Android integration, is of a noticeably lower resolution, and is controlled either by touch or with a control wheel on the center console next to the shifter.

Infiniti expanding lineup by 60% over next five years

Johan de Nysschen had only been at the helm of Infiniti for two years when he left for a position atop Cadillac. But in that time, he indeed left his mark on the brand. Most visibly, there was the drastic Q-ification of the company's vehicle naming strategy, but beyond that were big plans to beef up the Infiniti brand with the goal of making it a fully competitive luxury automaker.
Autoblog spoke with Michael Bartsch, vice president of Infiniti Americas, during Monterey Car Week, and he confirms Infiniti's brand direction is "still exactly as Johan presented it." Over the next five years, the company's portfolio will expand by 60 percent, and that will be aided with additional engine and transmission plants, most notably the recent collaboration with Daimler to build 2.0-liter turbocharged four-cylinder engines.
Infiniti's lineup will grow to include eight sedans/coupes and five crossovers/SUVs.