The XX program started back in 2005 has been a huge success for Ferrari, with loyal customers spending millions of dollars for track specials that are designed primarily with road car development in mind. Basically, when an FXX K is at full tilt on a track, the driver is paying Ferrari while doing their work. Yet with 1035 horsepower on tap, fun is guaranteed, even if the XX prototypes are technically not race cars.
In order to come up with an evolution of the LaFerrari-based FXX K for the 2018/19 season (which includes nine track events starting in March), Ferrari put 12,500 miles of development and reliability runs into what is now revealed as the FXX K Evo, shedding weight and making significant improvements to the aero package.
Ferrari claims that more than a year's worth of CFD simulations and wind tunnel testing gave the FXX K Evo downforce levels "very close to those of the cars competing in the GT3 and GTE championships," with a 23 percent improvement over the previous version, and a 75 percent increase compared to the road-going LaFerrari. The figures include 1410 lbs. at 125 mph, with the negative lift exceeding 1830 lbs. near the Evo's top speed.
While the lower weight comes courtesy of a new carbon-fiber construction method, the downforce comes mostly thanks the twin-profile fixed wing on the tail. This works together with the active rear spoiler, with one amplifying the other. Additionally, the rear wing is supported by two side fins as well as by a central fin. Ferrari says that the latter plays a dual role: "firstly it acts as a vertical fin, boosting stability at low yaw angles, and secondly, it supports the action of the three delta (triangular) vortex generators."
Ferrari explains it in great detail, declaring that said vortex generators "clean the flow field striking the wing of the effects of the wake of the hot air flow from the radiators which vents onto the bonnet, while also creating a downwash component in the flow which boosts the twin-profile’s downforce capacity."
Needless to say, the new rear structures also demanded redesigned bumpers front and rear, as well as enlarged by-pass vents on the rear wheel arches to provide better flow to the rear diffuser, supported by the new vortex generators on the underside.
At the front, Ferrari was equally particular about even the smallest details. As they explain, "the geometry of the sides of the front bumper was altered by hollowing out the surfaces beneath the headlights. This made space for a couple of flicks divided by a vertical turning vane and an additional intake ahead of the front wheels. This system makes good use of know-how acquired in the GT programs in which rules introduced in 2016 permitted extensive study of the interaction between horizontal (flicks) and vertical (dive plane) flow management systems, optimizing their efficiency." The FIA should be happy to hear that!
To complete the package, the front brake air intakes are also improved without being widened, keeping drag low around the upgraded suspension components.
Inside the cabin, those selected few will be looking at a "conceptually-different steering wheel" which now includes a KERS Manettino, a larger, 6.5 inch rear video camera screen. This LCD displays telemetry data as well, with KERS status and lap times available at a touch of a button.
As tradition, the biggest gathering of FXX K Evos will be at the Finali Mondiali weekend, which marks the end of each racing season in October.