McLaren's Formula One team had used the MP4 prefix for its chassis since 1981, the acronym standing for McLaren Project 4, a legacy of the merger between Ron Dennis' Project Four Racing organisation and McLaren. The 12 in the car's name references McLaren's internal Vehicle Performance index, which evaluates cars across four criteria: power, weight, emissions, and aerodynamics. The C signifies carbon structure. In 2012, McLaren dropped the MP4 portion of the name and simplified it to 12C.
Development began in 2005. McLaren used a series of modified third-party vehicles as test mules: the MV1 was a Ferrari 360 carrying a 3.8-litre twin-turbocharged V8 and side vents for cooling; the MV2 was a modified Ultima GTR used to test braking and suspension; and the MV3 was another Ferrari 360 focused on exhaust system evaluation. Two in-house prototypes, the CP1 and CP2, followed with a MonoCell monocoque and were used to test heat management and performance.
McLaren produced over fifty experimental prototypes tested across extreme environments: hot weather in Bahrain, Arizona, and Nevada; cold weather in the Arctic and Sweden; high altitude in South Africa; and endurance testing on European circuits and roads. Test bases were established at Idiada in northern Spain and the Prototipo facility near Nardo in Italy.
Frank Stephenson was appointed lead design director in 2008 and contributed adjustments to headlights, front bumper, and interior elements late in development. The final design was unveiled online in September 2009 and made its physical debut at the Goodwood Festival of Speed in July 2010. Series manufacturing began on 2 February 2011 at McLaren's Woking, Surrey facility following a £50 million investment in the production site, which was formally opened by Prime Minister David Cameron on 18 November 2011.
The defining structural element of the 12C is the MonoCell, a carbon fibre composite chassis manufactured by Carbo Tech in Salzburg, Austria. Weighing 80 kilograms, it is considerably stiffer and lighter than traditional riveted alloy structures. McLaren invested £127.7 million into MonoCell development. The time to produce the structure fell dramatically — from 3,000 hours for the McLaren F1 and 500 hours for the Mercedes-Benz SLR McLaren to just four hours for the 12C. Carbo Tech manufactured the MonoCell for McLaren for over eight years, making it the world's largest carbon fibre order for series-produced cars.
The 12C is a two-door coupe with dihedral doors and a rear-wheel drive layout with a longitudinally placed mid-engine. Suspension is double wishbone with hydraulic units called the ProActive Chassis Control. The car uses rack-and-pinion electric power steering. Brakes at the front use a four-piston fixed calliper with a two-piece rotor.
Power comes from the 3.8-litre twin-turbocharged V8 engine designated M838T, produced by Ricardo PLC in West Sussex, England. It delivers 453 kilowatts (616 PS) at 7,500 rpm and 601 newton-metres of torque at 3,000 rpm. The result is a 0–97 km/h (0–60 mph) sprint of 2.9 seconds and a top speed of 333 km/h (207 mph). Transmission is a seven-speed dual-clutch unit by Graziano, designated SSG. The centre console carries a seven-inch touchscreen controlling the Meridian audio system, with Bluetooth and Wi-Fi connectivity. Wheels are 19 inches at the front and 20 inches at the rear, wearing ultra-low-profile Pirelli tyres.
On 10 July 2011, the MP4-12C posted the second fastest lap around the Top Gear test track at 1 minute 16.2 seconds. The car lapped the Nurburgring in 7 minutes and 28 seconds. It won the Middle East Car of the Year Award as Best Supercar in 2012 and the overall Car of the Year at the Middle East Motor Awards the same year.
The 12C Spider uses a retractable hardtop. Because the coupe was designed from the outset with a convertible in mind, no structural strengthening was required and the Spider weighs only 40 kg more than the coupe. Top speed with the roof up is 328 km/h (204 mph), with up to 315 km/h (196 mph) possible with the roof lowered. Dihedral doors are retained from the coupe.
In March 2012, McLaren released images of five MP4-12C HS models. The HS (High Sport) variant features revised aerodynamic components inspired by the 12C GT3, including a revised front end and rear bumper, larger vents and diffuser, and a modified rear wing. Power was increased by 75 horsepower. Only ten units were produced.
McLaren announced a GT3 racing variant in December 2010. The MP4-12C GT3 produces 493 bhp (500 PS) — reduced from road-car output for homologation purposes — and uses a bespoke six-speed gearbox 80 kg lighter than the road car's seven-speed, developed with Ricardo. Its steering wheel is sourced from the McLaren MP4-24 Formula One car. The car made its debut at Spa-Francorchamps in the British GT championship, followed by a three-car entry at the 2011 Spa 24 Hours. In 2012, McLaren prepared 25 GT3 cars for a full season in the FIA GT1 World Championship, with the car taking its first international victories at the Circuito de Navarra round, driven by Hexis Racing.
The 12C re-established McLaren Automotive as a volume manufacturer of road cars and provided the technical foundation — most notably the MonoCell and the M838T engine — for subsequent models including the 650S, 675LT, and the Super Series range that followed.
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