SF90 XX STRADALE AND SF90 XX SPIDER: THE FIRST ROAD-GOING CARS IN THE XX PROGRAMME

- The new SF90 Stradale-based Ferrari special version unveiled at the Fiorano circuit
- The SF90 XX Stradale is flanked by the SF90 XX Spider equipped with a retractable hard top
- Just 799 SF90 XX Stradale and 599 SF90 XX Spider will be built
- The performance characteristics are a perfect combination between the Special Series and the XX programme

Maranello, 29 June 2023 – Based on the SF90 Stradale, the new special limited series SF90 XX Stradale was unveiled today alongside its SF90 XX Spider counterpart. To be built in just 799 and 599 examples respectively, these new V8-powered PHEVs represent the latest and most extreme example of a concept of special versions, which pushes the performance of Ferrari’s road-going models to new levels.

The SF90 XX Stradale is based on the supercar in the range, the SF90 Stradale, and raises its already impressively exhilarating track and on-the-limit driving experience to new heights. Performance is boosted thanks to its impressive 1,030 cv (30 more than the SF90 Stradale), specific software logics and the use of radical new aerodynamics solutions, including a fixed rear spoiler – the first to appear on a road-going Ferrari since the days of the F50 – which delivers an unparalleled 530 kg of downforce at 250 km/h.

The same concept provided the inspiration for the SF90 XX Spider, which combines the ultimate on-track adrenaline rush with the heady pleasure of en plein air driving, where the iconic sound of the Ferrari V8 gives such a vital contribution. The SF90 XX Spider benefits from the same sophisticated aero solutions as the SF90 XX Stradale, as well as specifically developed cockpit air flows that guarantee superb occupant comfort with the top down. It is equipped with Ferrari’s acclaimed Retractable Hard Top (RHT), which comprises aluminium panels and not only deploys and retracts in a mere 14 seconds, but can also be activated at speeds of up to 45 km/h.

INTERNAL COMBUSTION ENGINE
Thanks to its 797 cv, the mid-rear-mounted V8 turbo raises the performance limit bar still further for this particular architecture. The SF90 Stradale’s power unit was used as the starting point for the F154FB engine which powers the SF90 XX Stradale, and is now significantly more extreme. Efficiency was increased by polishing the inlet and exhaust ducts and the compression ratio was increased with the adoption of new pistons and specific machining of the combustion chamber. The removal of the secondary air system also slashed 3.5 kg off the engine’s weight compared to the previous application.

ELECTRIC MOTORS
Like the SF90 Stradale, the SF90 XX Stradale has three electric motors, one located between the ICE and the gearbox and two on the front axle. In this instance, they deliver a maximum of 233 cv or 171 kW, thanks to the patented extra boost vehicle dynamics logic, an absolute first on a Prancing Horse road car. The SF90 XX Stradale’s high performance lithium-ion battery powers the three motors, guaranteeing a 25km range in full-electric mode. When the ICE is off, the front motors give the car a maximum speed of 135 km/h.

The control logic optimally manages the power flows focusing on either efficiency or performance as required. The driver can use the eManettino selector on the steering wheel to choose from four different power management modes. In eDrive mode, the internal combustion engine is turned off and traction is entrusted entirely to the front axle; in Hybrid mode, it favours battery energy depletion and manages transitions autonomously, maximising the full-electric range; in Performance mode, the internal combustion engine is kept running as the priority is on maintaining consistent performance, rather than on achieving the peak power; and in Qualifying, the system unleashes its maximum power output, thanks to a control logic that prioritises performance, using the brand-new extra boost function.

GEARBOX
The SF90 XX Stradale and the SF90 XX Spider retain the 8-speed dual-clutch gearbox that made its first appearance in the Ferrari range on the SF90 Stradale. However, the gear-shift logic has changed significantly: the car uses the patented logic introduced on the Ferrari Daytona SP3 to reach more engaging dynamic acceleration profiles. Furthermore, the new logic improves the gear-shift sound by introducing an exhaust note similar to the overrun on lift-off noise typical of high-performance driving at medium/high revs.

AERODYNAMICS
The latter, which was also redesigned, efficiently manages the downforce/drag trade-off and has two configurations: LD (Low Drag) in which the mobile element is raised and is faired in with the fixed section, minimising drag to enhance longitudinal performance, while in HD (High Downforce), the mobile element is lowered, closing the blown area, thereby allowing the air to hit the fixed area. This generates an overpressure area which, aside from generating rear downforce, also deflects the incoming flow vertically to help deliver the absolute maximum rear downforce possible: 315 kg at 250 km/h.

VEHICLE DYNAMICS
The transition from electric mode to hybrid mode is extremely smooth thanks to the seamless coordination between the electric front axle, the 8-speed DCT gearbox, the rear-mounted electric motor and the V8 engine. This in turn guarantees progressive, continuous acceleration and makes all the powertrain’s power available as rapidly as possible.

The Torque Vectoring and Energy Recovery under braking and lift-off functions are available in all configurations, and the Ferrari Dynamic Enhancer (2.0) makes its debut. It is also active in all dynamic Manettino positions and all grip conditions. The various systems are all managed by the electronic Side Slip Control (eSSC) 1.0.

Another major new addition is the ABS EVO controller, which debuted on the 296 GTB. Thanks to its integration with the 6W-CDS sensor it improves both performance and repeatability in high performance braking in dry conditions. It functions in high grip situations and in the Manettino positions from Race upwards using the data from the 6W-CDS sensor to obtain a precise estimation of the car’s speed. This makes it possible to determine the target slip of all four wheels and consequently optimise brake distribution.

In addition to this, also debuting on SF90 XX Stradale is the extra boost control logic which guarantees additional power in short bursts. The job of this software, which is only active in the Qualifying mode of the eManettino, is to produce an extra boost of power at the critical moment when the car is exiting a bend, something which alone improves lap time by 0.25s at Fiorano. The logic controls the power delivery, managing peak performance with battery charge, also monitoring the status of the components with the aim of optimising electric power delivery.

The availability of the extra boost is indicated by a graph on the right-hand side of the dash display, and shows the remaining number of bursts left (maximum 30). The control logic guarantees this feature is fully useable for at least one or more laps of the track depending on the latter’s individual characteristics. This is thanks to the fact that the areas of the track where activating the power surplus is most useful are pinpointed heuristically, attempting to exclude areas where using it would not reduce the lap time.

The car has a set-up with elastic characteristics and kinematic angles designed solely to optimise its behaviour on the limit. There is a 9% improvement in lateral performance (Ay max) compared to the SF90 Stradale in high speed handling conditions, mostly as a result of downforce. Furthermore, the roll rate was reduced by 10% thereby guaranteeing better body control.

STYLING

INTERIOR
The guiding principle of the SF90 XX Stradale’s interior design was highlighting the cockpit’s racing vocation through solutions that would provide significant weight-savings. The main areas involved were the door panels, tunnel and mats, which are now simpler in terms of their shape and the mainly technical fabrics used, while carbon-fibre was used for functional areas. The upper part of the dashboard is trimmed in Alcantara®, while the lower part is trimmed in technical fabric. Both are inspired by the racing world.

7 YEARS MAINTENANCE
Ferrari’s unparalleled quality standards and strong focus on client service underpin the extended seven-year maintenance programme offered with both the SF90 XX Stradale and the SF90 XX Spider. Available across the entire range, all regular maintenance for the first seven years of the car’s life is covered. This scheduled maintenance programme for Ferraris is an exclusive service that allows clients the certainty that their car is being kept at peak performance and safety over the years. This very special service is also available to owners of pre-owned Ferraris.

source: Ferrari Press Release

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