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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.

Datsun previews new budget sedan for Russia [w/video]

Nobody does cars on the cheap quite like the Renault-Nissan Alliance. The former part of the equation already has its Dacia brand of cost-effective, no-frills vehicles that have become a favorite of Top Gear co-host James May, and last summer, the latter revived its Datsun nameplate for a budget brand of its own.
The reborn Datsun launched in India this past July with its Go hatchback, returned in September with the Go+ minivan and revealed the Redi-Go concept just last month. And now it's given us our first look at an upcoming budget sedan developed specifically for the Russian market.
The as-yet unnamed vehicle (which we'll bet will incorporate the word "go" into its nameplate somehow) is set to debut on April 4, where it will launch the Datsun brand in Russia. Few details are available at this point, but the low-cost sedan was designed in Japan to offer Russian drivers "an engaging driving experience, peace of mind ownership and accessibility at the right and transparent price, with a competitive Total Cost of Ownership."

2023 Japan Mobility Show Mega Photo Gallery: All the highlights and reveals from Tokyo

The 2023 Japan Mobility Show managed to serve up a surprise heap of exciting and futuristic designs and production reveals. Our staff was on the ground in Tokyo for this year's show, where we captured not just all of the latest automotive trends, but some genuinely weird and fascinating stuff.  Browse: Some Delightful Oddities of the 2023 Japan Mobility Show But on to the cars. This year's show featured introductions from Daihatsu, Honda, Lexus, Mazda, Mitsubishi, Nissan, Subaru, Suzuki and Toyota. Some are weird; some are wild; most are probably destined to change significantly before production or merely fade into the void with the rest of the industry's vaporware, but if even a few of these make it to showrooms, we'll consider it a win. Scroll on down for our live galleries of each of the show's major debuts (and cars we're only now seeing in person for the first time). Enjoy!   BMW X2 and iX2 BMW X2 View 6 Photos   Daihatsu me:MO Concept Daihatsu me:MO concept View 14 Photos   Daihatsu Vision Copen Concept Daihatsu Vision Copen View 7 Photos   Daihatsu Osanpo Concept Daihatsu Osanpo View 6 Photos   Daihatsu Uniform Concept Daihatsu Uniform concept View 6 Photos   Honda Prelude Concept Honda Prelude concept View 5 Photos   Honda Sustania-C and Pocket Concepts Honda Sustania-C and Pocket Concept View 8 Photos   Honda CI-MEV Concept Honda CI-MEV View 3 Photos   Infiniti Vision Qe Concept Infiniti Qe concept View 14 Photos   Lexus LF-ZC Lexus LF-ZC View 8 Photos   Lexus LF-ZL Lexus LF-ZL View 10 Photos   Mazda Iconic SP Mazda Iconic SP concept View 8 Photos   Mitsubishi D:X Concept Mitsubishi D:X Concept View 8 Photos   Nissan Hyper Force Concept Nissan Hyper Force concept View 11 Photos   Nissan Hyper Tourer Concept Nissan Hyper Tourer concept View 6 Photos   Nissan Hyper Punk Concept IMG_6533 copy View 8 Photos   Subaru Sport Mobility Concept Subaru Sport Mobility Concept View 7 Photos   Suzuki Swift Suzuki Swift View 5 Photos   Suzuki eWX Suzuki eWX Concept View 3 Photos   Suzuki eVX Suzuki eVX concept View 4 Photos   Toyota Land Cruiser Se Concept Toyota Land Cruiser Se concept View 4 Photos   Toyota FT-3e Concept Toyota FT-3e View 6 Photos   Toyota FT-Se Concept Toyota FT-Se View 7 Photos     Tokyo Motor Show Honda Infiniti Lexus Mazda Mitsubishi Nissan Subaru Suzuki Toyota