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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.

Reveling in the reveals: BRZ, Civic, Wrangler, QX55

It’s almost like there should have been an auto show this week. If youÂ’re an enthusiast, you know the week before Thanksgiving is when the Los Angeles Auto Show kicks off. This year, thereÂ’s no L.A. show, at least until next May. But Subaru, Honda, Jeep and Infiniti rolled out significant new products this week, making us almost nostalgic for auto shows. Serendipity, or more likely previously allocated marketing budgets, gave us a familiar feel of new products, even though we couldnÂ’t feel or touch them under the bright lights of the Los Angeles Convention Center. LetÂ’s break them down: 2022 Subaru BRZ 2022 Subaru BRZ View 62 Photos Subaru stuck to basic formula here: The 2022 BRZ remains a rear-wheel drive sports coupe thatÂ’s supremely lightweight, adequately powered and attractive. Subaru debuts its new boxer four-cylinder in the BRZ. ItÂ’s rated at 223 hp and you need to rev all the way to 7,000 rpm to achieve that output. I'd prefer a bit more than the 184 lb-ft of torque the powerplant offers (reasonably low in the band at 3,700 rpm), for some more off-the-line grunt. Say 200 lb-ft, though itÂ’s almost a cliche to argue the BRZ is underpowered.  The outgoing BRZ is one of the purest cars IÂ’ve driven, so rather than harp on the power, which will ultimately be fine, give Subaru props for focusing on chassis improvements to improve rigidity by 60 percent and aid turn-in. Admirably, the curb weight is less than 2,900 pounds, and the manual in Premium trim checks in at the lowest, just 2,815 pounds.  Aesthetically, I like it. ItÂ’s busier than before, and thereÂ’s a lot more going on with the front fascia, wheel arches and fenders. ThereÂ’s a bit of a Porsche vibe up front, which is good, and a bit of a Honda Civic vibe in back (think 2010) thatÂ’s not.  ItÂ’s impressive that Subaru resisted the urge to gratuitously power up the BRZ and remained focused on the essence of its goodness and appeal to enthusiasts. 2021 Jeep Wrangler 392 2021 Jeep? Wrangler Rubicon 392 View 75 Photos What effect will the 2021 Ford Bronco have on the Jeep Wrangler? One school of thought is that it will actually make the Jeep better, and the 2021 Wrangler 392 is proof positive that will be the case. With the Bronco attracting spectacular levels of attention, Jeep could not sit idly by and remain focused on incremental changes. It needed to make a splash.

2022 Infiniti QX55 marks the company's foray into crossover 'coupes'

Using a formula proven by the major German luxury car companies, Infiniti is now getting in on the crossover "coupe" game. The 2022 Infiniti QX55 takes the QX50 small crossover and adds a fastback roofline for a sportier look. Infiniti says the design makes the QX55 a spiritual successor to the FX crossover of the mid-to-late-2000s and early 2010s. We're not sure if the mechanical bits live up to the rear-drive-based FX chassis, but the low roof and curvy body do share a connection to that old SUV. In fact, the QX55 looks rather striking, and the flowing lines work nicely with the simple, arcing roof. Some other small tweaks to the base styling emphasize the QX55's style focus including a more pronounced grille with larger air intakes surrounding it at the front. At the back, the license plate mount has been moved to the bumper, allowing for prominent Infiniti lettering on the hatch. Additionally, 20-inch wheels are a standard feature on all QX55 models. The rest of the QX55 is basically the same as the QX50. It shares the turbocharged, variable-compression engine making 268 horsepower and 280 pound-feet of torque. It's mated to a CVT and all-wheel-drive, which is standard on all QX55 models. The interior is carry-over with dual infotainment screens and an asymmetric, driver-focused dash design. Like the QX50, it can be slathered in two-tone leather for a very premium feel. The debut vehicle features a bold black and red color combination. The QX55 goes on sale this coming spring. It will be available in three trim levels: Luxe, Essential and Sensory. Pricing hasn't been announced, but expect it to be a bit more costly than the equivalent QX50. For reference, a QX50 Luxe with all-wheel-drive starts around $44,000, and at the other end of the spectrum is the QX50 Sensory with all-wheel-drive starting at around $53,000. Related Video: