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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.

2015 Nissan Murano First Drive

The Murano has an interesting position within the Nissan stable. On one hand, its size puts it between the Rogue and Pathfinder, both of which are geared more toward families, big and small. And while the Murano could easily be used for hauling your brood, that's not exactly its forte. After all, unlike it's siblings, it offers no third row accommodations. There's no rear-seat entertainment system available. There are no clever storage systems. That's because, in Nissan's eyes, the Murano is the flagship of its crossover range, and it's geared more toward older couples – empty-nesters, or folks who just never got around to having kids. This allows the Murano to be more premium in terms its styling and its available content. The Murano is less about taking the kids to soccer practice and more about taking four adults out to a wine tasting. Premium styling is indeed the big story here – this Murano looks fantastic, and is a rather dramatic departure from the oft-disliked second-generation model it replaces. Beyond that, the new Murano is more in line with the radical-looking, first-gen CUV that debuted in the early 2000s. But Nissan says the whole Murano package was developed with this flagship theme in mind – the company's executives call this the Maxima of its crossovers. To find out if that all holds true for the 2015 Murano, I headed up to California wine country – the vehicle's natural habitat, I've been led to understand – to see what's what. When it came time to pen the 2015 model, Nissan strived to "push the reset button." I don't think anyone loves the Nissan Murano as much as the automaker's senior creative manager in North America, Ken Lee. While presenting the third-generation crossover to members of the media during the car's launch in Napa, CA, Lee said it was the original Murano that made him want to work for Nissan in the first place. So when it came time to pen the 2015 model, Lee strived to "push the reset button," and create a product with an equally strong styling statement. The goal here was to design a Murano that would resonate as a premium vehicle not only as part of the Nissan lineup, but within the midsize crossover segment as a whole. I use the word "resonate" for a reason. Think back to the 2013 Detroit Auto Show, when Nissan debuted its Resonance concept – an aggressive, modern showcar that clearly showed a new direction for not just the Murano itself, but for all of the Japanese automaker's future designs.

Future Classics, Acura Integra Type S and Cadillac Escalade-V | Autoblog Podcast #759

In this episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Associate Editor Byron Hurd. They jump right in with some news that Toyota may revive the Land Cruiser in the U.S., followed by rumors of a Nissan GT-R successor. From there, it's on to official confirmation of the Acura Integra Type S revival, followed by a partial rundown of Hagerty's 2023 Bull Market List. After that, it's time for some road test updates. Greg talks about his time in Autoblog's long-term BMW 330e PHEV and contrasts it with the 2023 Cadillac Escalade-V. Byron has been driving a Nissan Rogue, Mazda CX-30 and an Infiniti Q50 — serving as a perfect launch pad for a look back at 2022's best sport sedans. After that, it's a preview of Autoblog's 2022 Holiday Gift Guide.  Send us your questions for the Mailbag and Spend My Money at: Podcast@Autoblog.com. Autoblog Podcast #759 Get The Podcast Apple Podcasts – Subscribe to the Autoblog Podcast in iTunes Spotify – Subscribe to the Autoblog Podcast on Spotify RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown Return of the Land Cruiser? Nissan's GT-R successor Acura Integra Type S confirmed Hagerty's 2023 Bull Market List What we've been driving 2022 BMW 330e long-term update 2023 Cadillac Escalade V-Series 2023 Infiniti Q50 2023 Mazda CX-30 Best sport sedans for 2023 Feedback Email – Podcast@Autoblog.com Review the show on Apple Podcasts Autoblog is now live on your smart speakers and voice assistants with the audio Autoblog Daily Digest. Say “Hey Google, play the news from Autoblog” or "Alexa, open Autoblog" to get your favorite car website in audio form every day. A narrator will take you through the biggest stories or break down one of our comprehensive test drives. Related video: Podcasts Acura BMW Cadillac Infiniti Mazda Nissan Toyota Long-Term Garage