Stuttgart, July 2006. Mercedes-Benz announced the SLR McLaren 722 Edition, a performance-focused homage celebrating the legendary 1955 Mille Miglia victory and establishing the ultimate expression of the Mercedes-McLaren partnership through supercharged engineering and hand-assembled craftsmanship. The designation “722” invoked racing heritage tracing back to Stirling Moss and Denis Jenkinson’s victorious 300 SLR, which started at 7:22 a.m. in that historic endurance race. The 5.4-liter supercharged AMG V8 produced 650 PS (641 horsepower) at 6,500 rpm and 820 N·m (605 lb-ft) of torque at 4,000 rpm, delivering 337 km/h (209 mph) capability from a carbon-fiber chassis with an EC kerb weight of approximately 1,724 kilograms.
This was Stuttgart celebrating that supercharged engineering combined with McLaren’s carbon-fiber expertise could establish genuine supercar-competitive performance while maintaining grand touring practicality and luxury. The SLR 722 could accelerate from 0-100 km/h in 3.6 seconds, establishing credentials rivaling purpose-built machinery while maintaining the refined character expected from Mercedes’ performance division. Production ran from August 2006 through June 2008, with exactly 150 examples built as a limited coupe variant, establishing the 722 Edition as one of the rarest modern Mercedes-Benz creations.
Background and Origins
The SLR McLaren 722 Edition emerged from Mercedes-Benz’s vision of creating a performance-focused variant celebrating the marque’s legendary racing heritage. Rather than develop an entirely new platform, management determined that systematic engine tuning, revised suspension calibration, enhanced aerodynamics, and aggressive styling would establish the ultimate road-going expression of the Mercedes-McLaren collaboration. The 722 incorporated more than 300 modified components, including engine calibration, suspension geometry, steering response, brake systems, wheels and aerodynamic treatment, representing a substantially reworked version of the standard SLR rather than a cosmetic refresh.
The “722” designation paid direct tribute to the victorious Mercedes-Benz 300 SLR raced by Stirling Moss and Denis Jenkinson in the 1955 Mille Miglia endurance race, a historic victory establishing Mercedes’ dominance in international motorsport. Development drew on Stuttgart’s extensive AMG performance engineering expertise combined with McLaren’s pioneering carbon-fiber construction technology, representing the collaborative peak of the Mercedes-McLaren partnership. The 722’s engine received revised calibration from the standard SLR’s 617 horsepower output to 641 horsepower, while suspension, steering and braking systems were comprehensively retuned for enhanced performance and driver engagement.
Design and Engineering
The SLR McLaren 722 Edition retained the elegant proportions established by the original SLR but incorporated aggressive aerodynamic modifications establishing its distinct character. The redesigned front bumper incorporated a carbon-fiber front splitter, optimized air intakes and revised aerodynamic treatment. The aggressive splitter reportedly increased front-axle downforce by 128 percent while reducing overall aerodynamic drag. Enhanced side vents, revised rear diffuser and integrated ducting improved cooling performance while reducing lift at high speed. The overall proportions suggested that genuine performance required engineering authenticity rather than theatrical styling drama. The front-mounted longitudinal engine arrangement established the distinctive grand touring silhouette defining the model’s character.
The chassis employed independent aluminum double-wishbone suspension front and rear with coil springs and gas-pressurized dampers, with the 722 receiving stiffer springs and revised damper calibration that lowered ride height by 10 millimeters compared to the standard SLR. Anti-roll bars provided cornering control calibrated for both circuit performance and practical road use. Braking was by 390-mm carbon-ceramic front discs with eight-piston calipers and 360-mm rear discs with four-piston calipers operated through Mercedes’ Sensotronic Brake Control brake-by-wire system, providing powerful stopping power adequate for the supercharged acceleration. Power-assisted rack-and-pinion steering provided direct feedback and engaging control characteristics reflecting performance-first engineering philosophy.
The hand-assembled 5.4-liter M155 supercharged AMG V8 represented Mercedes’ most sophisticated supercharged performance engineering, displacing 5,439 cubic centimeters with 24 total valves operated by single overhead camshafts, featuring three valves per cylinder. The engine featured a Lysholm-type twin-screw supercharger with intercooling, providing smooth power delivery establishing the SLR’s legendary character. With 8.8:1 compression ratio and sophisticated Bosch engine management calibrated specifically for the 722, output reached 650 PS (641 horsepower) at 6,500 rpm and 820 N·m (605 lb-ft) of torque at 4,000 rpm. This represented extraordinary supercharged performance celebrating mechanical authenticity and hand-built craftsmanship from AMG’s Affalterbach facility.
The power delivery was distinctly supercharged in character, with smooth boost delivery and nearly flat torque curve establishing responsive acceleration across the rev range. The five-speed AMG SPEEDSHIFT automatic transmission featured sophisticated shift logic emphasizing durability and high-speed stability over rapid-fire gear changes. This emphasis on mechanical directness reflected Mercedes’ philosophy celebrating driver connection and engineering sophistication.
Weight-saving measures including the carbon-fiber monocoque, composite bodywork, lighter 19-inch forged-alloy wheels and reduced sound-deadening helped bring the 722’s EC kerb weight to approximately 1,724 kilograms, about 44 kilograms less than the standard SLR. This achieved an exceptional power-to-weight ratio of approximately 2.7 kilograms per horsepower, establishing supercar-competitive performance credentials.
Styling
Mercedes-Benz and McLaren’s collaborative design created visual drama immediately recognizable as the ultimate expression of contemporary grand touring elegance. The aggressive front end featuring the carbon-fiber splitter, enhanced aerodynamic modifications, and purposeful bodywork established sophisticated performance through refined engineering. The distinctive upward-opening butterfly doors became the SLR’s signature, while the low roofline and extended hood suggested the powerful engine beneath. Crystal Antimony Grey became the characteristic finish for the 722 Edition, with most examples delivered in this exclusive color celebrating the model’s performance heritage.
Interior
The cabin emphasized driver engagement combined with luxury appointments reflecting Mercedes’ quality standards and performance focus. Semi-aniline leather seating combined with Alcantara and red stitching provided excellent support during spirited driving while maintaining comfort for extended grand touring journeys. Exposed carbon-fiber trim established visual performance authenticity alongside genuine luxury appointments.
The driving position was commanding and well-balanced, with all controls falling naturally to hand. Red seat belts and 722 insignia on the head restraints emphasized the model’s heritage connection. Advanced instrumentation displayed essential engine parameters including tachometer and comprehensive engine readouts reflecting contemporary performance standards. Climate control, premium audio systems, and sophisticated technology reflected contemporary luxury standards.
Specifications
- Engine: Mercedes-AMG M155 supercharged V8, 5,439cc, SOHC, three valves per cylinder (24 total)
- Supercharger: Lysholm-type twin-screw with intercooling
- Power: 650 PS / 641 hp at 6,500 rpm
- Torque: 820 N·m / 605 lb-ft at 4,000 rpm
- Transmission: Five-speed AMG SPEEDSHIFT automatic, rear-wheel drive
- Chassis: Carbon-fiber-reinforced composite monocoque, 2,700mm wheelbase
- Suspension: Aluminum double wishbones (front and rear), coil springs, gas-pressurized dampers (10mm lower than standard SLR)
- Brakes: 390-mm carbon-ceramic front discs with eight-piston calipers, 360-mm carbon-ceramic rear discs with four-piston calipers, Sensotronic Brake Control
- Wheels: 19-inch forged alloy (255/35 ZR19 front, 295/30 ZR19 rear)
- Weight: Approximately 1,724 kg / 3,800 lbs EC kerb weight
- Performance: 337 km/h / 209 mph top speed, 0-100 km/h in 3.6 seconds
Production and Legacy
A total of 150 SLR McLaren 722 Edition coupes were produced, with production beginning in August 2006 and continuing through June 2008, establishing exceptional exclusivity. The vehicle assembly took place at McLaren’s Woking facility, while the M155 engine was hand-assembled by Mercedes-AMG at Affalterbach, representing the collaborative excellence of both engineering centers. The limited production run reflected the car’s exclusive positioning and substantial pricing, making the 722 Edition one of the rarest modern Mercedes-Benz creations.
The SLR McLaren 722 Edition proved that supercharged engineering combined with carbon-fiber construction could establish genuine supercar performance within practical grand touring parameters. The combination of supercharged character, hand-built sophistication, and racing heritage established lasting appeal among serious performance car collectors.
Today, 722 Edition examples command strong collector appreciation reflecting their exclusive status and rarity. The combination of supercharged V8 performance, McLaren carbon-fiber expertise, and Mercedes luxury ensures significant appeal among collectors valuing mechanical authenticity and contemporary engineering achievement.
The Mercedes-Benz SLR McLaren 722 Edition represented Stuttgart and Woking at their most collaborative, establishing a significant chapter in the storied 300 SLR heritage. It remains one of the greatest grand tourers ever created, establishing an enduring legacy within Mercedes-Benz’s performance tradition.
