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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.

Recharge Wrap-up: Infiniti PHEV, free biodiesel?

In certain cases, biodiesel is so inexpensive that it is essentially free to use. Thanks to the decline of crude oil prices, other fuels, including biodiesel, have been following the trend. After setting new renewable fuel mandates, Congress also reinstated a $1-per-gallon tax credit for refiners. With such low prices, Midwest refiners are paying as low as $0.645 per gallon. In California, however, additional incentives mean some customers could get money back on the biodiesel they use, depending on the deals between producers and blenders and whether or not they share the credits. Read more from Ag Web. Infiniti is considering adding plug-in hybrid technology to its vehicle lineup. Infiniti CEO Roland Krueger says that it will leverage the EV expertise from Nissan for the electrification of its cars. Don't hold out for a luxury version of the Leaf wearing an Infiniti badge, though. When asked if an all-electric Infiniti were out of the questions, Krueger says, "Performance and the range are very important in the premium segment, so we believe that for Infiniti a hybrid or plug-in hybrid is the right proposition at this time." Read more from Automotive News Europe. Hyundai Tucson Fuel Cell drivers in California have logged a cumulative 1 million miles. With nearly 100 Tucson Fuel Cells sold so far in Southern California, these drivers have prevented some 385 tons of CO2 emissions. "Breaking the seven-figure consumer mileage barrier gives us new vision into the unlimited zero-emissions potential for Hyundai's fuel cell vehicles," says Hyundai's Mike O'Brien. "With our growing fleet of hydrogen-powered Tucson fuel cell vehicles accumulating one million miles this quickly, one can only imagine the unlimited potential for a zero-emissions hydrogen vehicle future." Read more in the press release below. Hyundai Tucson Fuel Cell Drivers Accumulate More Than One Million Zero-Emission Miles Cumulative Zero-emissions Miles by Southern California Fuel Cell Drivers Breaches the Seven-Figure Mileage Barrier Fuel Cell clean H2O emissions effectively replaced approximately 385 Tons of CO2 emissions compared with gasoline vehicles of similar size FOUNTAIN VALLEY, Calif., Feb.

2025 Infiniti QX80 First Drive Review: So close to being great

NAPA, Calif. – Confession time. I kind of forgot that the Infiniti QX80 exists. Sure, itÂ’s gotten a refresh or two in the past few years, but it's essentially been the same big olÂ’ three-row SUV since 2010. IÂ’m pretty sure I used to call it Fudgie the Whale. Or maybe it was Pudgie the Whale. Like I said, itÂ’s been a minute. Now IÂ’ve gotten a taste of the 2025 QX80 and hey, what do you know, there is a lot to like. The third-generation of the body-on-frame SUV goes big on tech, style and comfort, making it a respectable triple into the right-center gap. However, its ride quality keeps the QX80 from being a home run. FudgieÂ’s V8 was nixed in favor of a 3.5-liter twin-turbo V6 good for 450 horsepower and 516 pound-feet of torque. Sure, it doesnÂ’t sound quite as good as the older powerplant, but it produces more power and better fuel economy to boot – 18 mpg combined with rear-wheel drive and 17 with four-wheel drive. The old one managed only 15 mpg with four-wheel drive. With low-mpg numbers like these, thatÂ’s actually a huge difference. The new turbo V6 is well-mated to a nine-speed automatic transmission, putting the power down to the rear wheels as standard in Pure and Luxe trims, or all four wheels as an option with those trims or as standard with the higher Sensory and Autograph. There are no complaints about power delivery. It has more than enough grunt for merging and the transmission downshifts readily for easy passing. There are five drive modes as well as a Personal setting, but I spend my time alternating between Standard and Sport. The latter tightens up the steering and powertrain, allowing the SUV to hustle fairly well on a twisty road without much body roll. ItÂ’s no Mercedes-AMG GLS, but starting at under $85,000 including destination, itÂ’s not nearly as expensive either. ItÂ’s when youÂ’re just toddling around town that the ride quality becomes a problem. All but the base Pure trim comes equipped with an “Electronic Air Suspension” and “Dynamic Digital Suspension,” the latter function monitoring the QX80Â’s motions to electronically apply damping forces. This isnÂ’t necessarily anything new in the automotive world, but other manufacturers just do it better. Up and down motions are well-controlled, but IÂ’ve been in row boats with more side-to-side stability. My head gets tossed around like IÂ’m piloting a Jeep on a dusty back road, and all IÂ’m doing is driving the paved streets of Napa Valley, California.