via https://www.youtube.com/watch?v=hBUspUCwuNU
At the 2025 24 Hours of Le Mans, Porsche unveiled a unique one-off vehicle: the Porsche 963 RSP. Developed as a tribute to the legendary 917 and inspired by Count Rossi’s 1975 street-driven prototype, the 963 RSP is based on Porsche’s LMDh competition car but reimagined for public roads under special conditions.
The project was a collaboration between Porsche AG, Porsche Penske Motorsport, and Porsche Cars North America, with direct involvement from Roger Penske—whose initials form the RSP name. The concept was initiated as a design study and passion project, eventually culminating in a street-legal prototype unveiled near Circuit de la Sarthe.
The 963 RSP retains the race-spec 4.6-liter twin-turbocharged V8 hybrid powertrain, delivering up to 680 horsepower. Originally developed for the RS Spyder and later refined in the 918 Spyder, the engine architecture includes a flat crankshaft, short stroke, and Van der Lee turbochargers for optimized throttle response. The hybrid system uses a Bosch motor generator unit and a Williams Advanced Engineering battery, working with a 7-speed Xtrac sequential gearbox. For road use, the power delivery was remapped to be smoother, and the system was configured to run on pump fuel.
To comply with road operation under French regulation, the chassis was adjusted with raised ride height, softened Multimatic dampers, and revised software to enable functioning headlights, taillights, and turn signals. Michelin rain-spec tires were mounted on 18-inch forged OZ wheels. Unique modifications such as covered wheel arches, a working horn, and license plate mounts were added.
Visually, the 963 RSP is finished in Martini Silver paint—not a wrap—requiring a triple-layer lacquer on ultra-thin Kevlar® and carbon fiber surfaces. An enamel Porsche crest replaces the standard nose graphic, and 1970s Michelin branding adds a period-correct touch. The rear features a 3D-printed “963 RSP” badge.
The interior departs sharply from the competition car. Trimmed in tan leather and Alcantara, it includes a cushioned, leather-wrapped carbon seat, air conditioning, a leather-finished steering wheel, and even a detachable 3D-printed cup holder. Storage space is provided for a laptop, headset, and Roger Penske’s custom carbon helmet. Ventilation outlets mimic the 917’s engine fan design, reinforcing historical continuity.
While the 963 RSP is not homologated for mass production, it is fully operational and authorized for limited road use under manufacturer permissions. Following its debut, the vehicle will appear at the Porsche Museum in Stuttgart and the Goodwood Festival of Speed.
This project showcases Porsche’s ability to blend heritage, engineering, and bespoke craftsmanship—all within the limits of a modern endurance prototype.
Porsche 963 RSP – Technical Specifications
Model name: Porsche 963 RSP
Type: Road-legal high-performance prototype
Chassis: Carbon-fiber monocoque (LMP2-based, by Multimatic)
Length: 5100 mm
Width: 2000 mm
Height: 1060 mm
Wheelbase: 3148 mm
Weight: Approximately 1030 kg
Engine type: Twin-turbocharged 4.6-liter V8
Engine code: 9RD (derived from Porsche 918 Spyder)
Max engine power: Over 515 kW (approximately 700 PS)
Max RPM: Over 8000 rpm
Turbo boost: Approximately 0.3 bar (2 turbos)
Hybrid system: Bosch MGU with 1.35 kWh battery from Williams
Total combined power output: 520 kW (707 PS, regulated)
Drive system: Rear-wheel drive
Transmission: 7-speed Xtrac sequential gearbox
Clutch: Carbon-fiber racing clutch
Top speed: Over 330 km/h
Suspension: Pushrod double wishbone with adjustable dampers
Brakes: Carbon racing brakes with regenerative hybrid system
Wheels: 18–19 inch race wheels adapted for road use
Fuel type: Synthetic or biofuel compatible
Emissions: Modified for street approval
Street modifications: Lighting, mirrors, exhaust system, license plate mounts
Interior: Stripped-down, race-focused with minimal comfort features
Production: One-off road-legal concept
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