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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 bringing Q50 Eau Rouge to Geneva, now with engine [w/video]

During last month's Detroit Auto Show, Infiniti rolled out the lustrous Q50 Moulin Eau Rouge concept - a preview of what could be a solid performance offering from Nissan's luxury arm. Problem is, the car shown in Detroit was all show and no go - literally.
Infiniti was keen to talk about how the Eau Rouge would feature "a big personality, V-cylinder engine with forced induction" with "over 500 horsepower and 600 pound-feet of torque," but the showcar had no such powerplant underhood. In fact, it didn't have any powerplant under the hood at all. That'll change next month, however, as Infiniti has now confirmed that it will bring the Q50 Eau Rouge to the Geneva Motor Show in March, complete with the promised "big personality" engine.
"Our engineers have perfectly captured the tone of Infiniti's take on premium performance, and a car that is as impressive as the Q50 Eau Rouge sounds is surely a car to challenge performance cars in the premium sector," said Infiniti's President, Johan de Nysschen. Regarding that sound: he ain't foolin' - the automaker has released a teaser video that gives us our first listen at what the Q50 Eau Rouge will sound like once its powerplant is nestled underhood. Scroll down to give it a watch - err, listen - and have a look beyond that for the company's official press blast.

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.