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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.

2025 Infiniti QX80 First Look: Can it command a hundred grand?

NEW YORK CITY — If Infiniti has its way, the all-new 2025 QX80 will be the flagship SUV that leads NissanÂ’s luxury marque into a much-needed renaissance. By the time the 2025 QX80 debuts, the current generation will have been on the market for 15 years. The model dates to 2010, when it debuted as the QX56 (prior to InfinitiÂ’s naming system revamp). The QX56/QX80 received a lot of hate for avant-garde styling that appeared to have been birthed from an H.R. Giger space horror. The 2025 iteration tones that down significantly with fewer curves and more chiseled lines. As previewed by the QX Monograph concept, the complete absence of surfacing on the sides is as unfussy it gets. The nose retains InfinitiÂ’s trademark double-arch grille, inspired by the enduring stone bridges of traditional Japanese gardens. Similarly, its vertical slats are meant to evoke the spires of a bamboo forest. The new Infiniti logo is now 3-dimensional, with the “infinite road” dropping into the center like a black hole. Unlike a black hole, it illuminates in an eye-catching effect that, thankfully, feels less pretentious than MercedesÂ’ glowing stars. At the rear, a full-width taillight bar recalls lights reflected in water and is made up of more than 300 LEDs. The thin lights flanking the grille are DRLs, while the QX80Â’s real headlights are embedded in nooks just above vents on either side of the front fascia. Happily, those vents are functional, directing cooling air to beefy two-pot calipers and 13-inch discs. Likewise, the (finally de-chromed!) driverÂ’s side fender vent acts as a heat extractor. That heat is generated by a new twin-turbo 3.5-liter V6 that replaces the outgoing naturally aspirated V8. Mated to a 9-speed automatic, it hails from the same engine family as the GT-R supercar and makes 450 horsepower and 516 lb-ft of torque, a surge of 50 horses and 105 lb-ft. At the same time, Infiniti says it gets 20% better fuel economy. Many forget that beneath the predecessorÂ’s alien beluga sheetmetal was a solid luxury SUV with real off-road bones. It was built on the same platform as the Nissan Patrol, a hard-core 4x4 that competes toe-to-toe with the legendary Toyota Land Cruiser in foreign markets. Come 2025 the QX80 will continue to share a chassis with the new Patrol, albeit an all-new body-on-frame unit that Infiniti says has 57% more lateral stiffness than the outgoing model and 300% increased torsional stiffness.

2022 Infiniti QX80 Interior Review | Refreshed, but still behind

You might assume the 2022 Infiniti QX80’s interior is filled with outdated technology from when it launched here about 10 years ago, but thatÂ’s not entirely true. You see, despite the rest of the car carrying over from the previous model year, the 2022 model year QX80 enjoys a refreshed interior. While this interior is updated, thereÂ’s no need to get overly excited. Nissan put the Armada through a mid-cycle refresh last year, and the QX80 essentially cribs all of its new bits directly from the Nissan. WeÂ’ve already tested the Armada, so we had an idea about what to expect when the refreshed QX80 landed at our doorstep. Thankfully, for InfinitiÂ’s sake, the ArmadaÂ’s new interior is nice enough that it's largely acceptable in the more luxurious QX80. It features a new, high-res touchscreen, flashy plastics, a simple layout and vital tech like a wireless phone charger, USB-C port and wireless Apple CarPlay — unfortunately, Android Auto remains a wired-only affair. The new look of this tall and vast center stack doesnÂ’t jive perfectly with the QX80Â’s flowy, rounded interior design, but thatÂ’s what you get when part of the interior is updated and the rest is left to carryover. Straight, strong lines dominate the center stack, complemented by rectangular vents. Meanwhile, rounded wood trim flows out of this brutalist center stack in a jarring manner that makes the interior look like two different designers worked on it separately, then had their work combined.  Functionally, the new parts of the interior are just fine. The new single touchscreen and its supporting user interface is a welcome update over the old dual-screen infotainment system that's still found in other Infinitis (it had only just received that system for 2020). Its large, width-oriented and mounted higher for easy viewing, plus the presence of supporting physical knobs and buttons make vital controls easy to use and adjust. The odd storage compartment in the dash houses the wireless phone charger, and the 12V outlet is hidden in there alongside it. We enjoyed the presence of a wireless phone charger, but it didnÂ’t charge our phones quickly, and the phoneÂ’s movement on the mat would sometimes cause it to stop charging altogether. Surprisingly, the QX80 is fitted with a camera rearview mirror, which was a nice surprise to see.