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Final Recap: Days 2 and 3 notes, quotes, and takeaways from the US Grand Prix

The Texas grass no longer rustles with 2.4-liter V8 exhaust blown at 18,000 revs, the Texas dust is no longer raised by hard-compound Pirellis. We saw a lot and learned a lot while we were there as guests of Infiniti, and after our Day 1 and race recaps, here are the bits left over from our time spent with the carmaker and Red Bull Racing, including thoughts on a "wicked" race, Christian Horner's quest for a more level playing field, Infiniti "going longer and deeper," and why Mario Andretti should get a police escort at the beginning of a race but not a microphone at the end...

Infiniti showcases Vision Gran Turismo concept in the metal

Automakers have been clamoring to convey their ethos to a new generation and cast their brand in a positive light through the Vision Gran Turismo series. But while these concepts are designed for the virtual reality of Gran Turismo 6, some automakers have gone a step further by pulling their creations out of cyberspace and rendering them in the metal. And that's just what Infiniti has done with its design. Infiniti revealed its Concept Vision Gran Turismo back in December, striking a a sleek, low-slung form that looks more polished than a racing car but more track-focused than most concepts. It's powered (at least hypothetically) by a 4.5-liter V8 hybrid powertrain, with center-lock carbon-fiber wheels and rearward-biased 45/55 weight distribution. It's the kind of beast we'd love to drive, but while that may only be possible on Playstation, at least we know it does exist in physical reality – even if only as a full-scale model. Infiniti showcased it alongside the Q80 Inspiration and Q60 Concept at an exclusive event during the Shanghai Motor Show last week, but just revealed the photos now, so you can scope them out in the slideshow above. Related Video: Show full PR text INFINITI VISION GT DISPLAYED OUTSIDE ITS ONLINE WORLD FOR THE FIRST TIME SHANGHAI, China – Last week at the 2015 Shanghai auto show, Infiniti held its inaugural Infiniti Design Night ahead of Auto Shanghai 2015. The evening occasion took place at the Shanghai Himalayas Art Museum. Under the theme of "Aesthetics of Contrast," Infiniti Design Night showcased three design concepts showing an exciting path to Infiniti's future: the Q80 Inspiration (first shown in Paris, October 2014), Q60 Concept (Detroit, January 2015), and the Vision Gran Turismo designed especially for the latest Gran Turismo® 6™ video game. This was the first time the Vision GT was displayed as a real "flesh and bones" concept car, having only been seen and experienced digitally in GT6 prior to this event. The dramatic Infiniti Concept Vision Gran Turismo The Infiniti Concept Vision Gran Turismo is a vision of what a high performance Infiniti could look like in the future. Available for download in GT6 exclusively on the PlayStation®3 system, it was created through close collaboration with the creators of Gran Turismo®, the racing game franchise developed by Polyphony Digital Inc. that has sold more than 72 million copies worldwide.

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.