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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's variable compression engine in the 2019 QX50 is the first of its kind

The world's first variable compression ratio engine is here, in a production car. That car is the 2019 Infiniti QX50, debuting this week at the Los Angeles Auto Show. The midsize crossover has seen a refresh that has brought it an all-new platform together with new driver assist features, but it's the engine that's the centerpiece here. Nearly everything is continuously variable under the hood of the QX50 – not only the new shift-by-wire XTRONIC CVT. The new VC-Turbo gasoline engine is able to change its compression ratio from 8:1 to 14:1, or anything in between depending of the driving situation; whether there is need for top-end power or turbodiesel-like torque from low revs, or optimized fuel economy. The pistons' reach is continuously adjusted by an electric "Harmonic Drive" motor, which controls a multi-link system, affecting the top-dead-center of the pistons and changing the compression. The engine can also switch between efficiency-maximizing Atkinson cycle and regular combustion cycle, on the go – and there's both multipoint injection and gasoline direct injection employed. The result is 268 horsepower at 5,600 rpm and 280 pound-feet of torque at 4,400 rpm; good figures for a 2.0-liter four-cylinder gasoline engine with a single-scroll turbocharger. Infiniti says that the FWD version's fuel economy of 27 miles per gallon combined is 35-percent better than the previous-generation V6 engine; in AWD guise, it reaches 26 mpg, which is a 30-percent improvement. The new engine is pretty much all-aluminum, but the vaguely magical-sounding "transformative multi-link components" behind the variable compression system are made from high-carbon steel alloy. The engine's multi-link system also enables it to do away with any balancing shafts, and Infiniti compares its smoothness to a V6 rather than a regular four-cylinder. In addition to the aforementioned tech, the VC-Turbo engine has the world's first active engine mount vibration damping system to smoothen its operation even further. Related Video:

Infiniti Q50 Eau Rouge racing toward Detroit with Red Bull in its veins

There are several ways an automaker can get into Formula One racing. It can start its own team from scratch (like Toyota did in 2002), it can buy an existing team (like BMW did with Sauber in 2005) or it can supply engines to other teams (as so many manufacturers have done over the years). Infiniti chose another direction and opted to sponsor the world-champion Red Bull Racing team.
Infiniti has undoubtedly poured millions into its partnership with Red Bull since it started in 2011, but aside from the Sebastian Vettel edition FX (which technically emerged from the company's sponsorship of the driver as separate from the team), the tie-in has yet to translate into a Red Bull-tuned (or at least -inspired) Infiniti for the road. But that's just what Nissan's premium brand has in store for us at the upcoming Detroit Auto Show in January.
Well, almost, because the concept just announced is still a step or two away from reaching your local Infiniti dealership, but here it is just the same. It's called the Q50 Eau Rouge, and it's based on the company's latest tech-laden sports sedan. It takes its name, of course, from the famous uphill section of the Spa-Francorchamps circuit where Sebastian Vettel won the Belgian Grand Prix earlier this year, but Infiniti isn't telling us much more than that.