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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.

2021 Infiniti QX80 gets full off-road prep, will take on the Rebelle Rally

Infiniti just revealed an off-road prepped QX80 that will take on the Rebelle Rally this week. Beginning today, the Rebelle Rally is an all-female rally where racers navigate off-road terrain from Lake Tahoe to the Imperial Sand Dunes by the U.S.-Mexico border. It’s 1,200 miles of rough terrain, so the luxurious QX80 needed a little help to get ready for it. The big bruiser of an SUV was handed off to Calmini Products Inc. in California for the prep work. It got a three-inch lift, heavy-duty control arms, off-road performance shocks, high clearance front and rear bumpers and thicker skid plates. The new Off-Road Monster 18-inch wheels are wrapped with chunky Nitto Terra Grappler all-terrain tires. We wouldnÂ’t normally say this about an Infiniti, but this QX80 looks badass. Calmini also added a PowerTank air-up tank and digital air-down kit to keep those tires at optimal pressure levels. Other extras include a rally computer, heavy-duty shackles and ropes, tow straps, two sets of Maxtrax platforms (to lift the vehicle for service if necessary), a fire extinguisher and two full-size spare tires secured in a custom-built cargo area cage. Both drivers are automotive journalists: Nicole Wakelin and Alice Chase. TheyÂ’re allowed compasses, roadbooks and maps, but no other navigational tools are available. The rally is scheduled to conclude on October 17. InfinitiÂ’s QX80 is a fine choice for this event, especially when you consider its underpinnings. The big SUV still uses a body-on-frame construction shared with the Nissan Armada. Nissan enthusiasts will also know that the Armada is based on the Nissan Patrol, which is a capable off-roading truck of an SUV sold in other parts of the world.

Infiniti ESQ is a Chinese Nissan Juke Nismo

Take a Nissan Juke Nismo, replace all of its suede and Alcantara interior with leather and cross-stitching, replace all of its badging with the words "Infiniti ESQ," and boom! You've got a made-for-China crossover aimed at "the new millennials." Infiniti teased the coming of the ESQ last month, and today, we're treated to pictures taking it in from various toothsome angles.
Whippersnappers with anywhere from 200,000 yuan ($33,507 USD) to 300,000 yuan to spend will get the same 197 horsepower, 1.6-liter turbocharged four-cylinder, sport-tuned CVT and all-wheel drive that we know in the Juke Nismo. We haven't tracked down any other official information about it yet, but potential buyers will get their first look at it during the Chengdu Motor Show that opens later this month, where it will share market-specific notes with Infiniti Q50 L.