Group CN is a category of vehicles used in motorsport, introduced by the FIA in 1993 for sports car racing.[ citation needed ] Group CN cars are mainly used in hillclimbing championships or sports racing series. Group CM is a non-FIA class which is closely related to Group CN.
Group CN rules are applied to a variety of championships. Many championships alter the rules in their own way like the Radical European Masters and V de V championships.
The Radical European Masters is a spec racing series in Europe. It features the Radical SR8, Radical RXC Spyder and Radical SR3, each in their own class.
The French-based V de V organisation features two FFSA Group CN based classes. The endurance championship is open for any chassis and engine within the regulations. The V de V organisation also features the Funyo Challenge open to Peugeot powered Funyo 4 or Funyo 5.
From 2022, the Indian Racing League has used Wolf GB08 "Thunder" models built to Group CN specification. [1]
A Group CN racing class exists in many countries, many of which utilize radicals. Examples are the Radical UK Cup which features the Radical SR3 and the Open España Prototipos.
Ran as part of the Benelux-based Supercar Challenge, the GT & Prototype Challenge allows Group CN classification cars to compete; current competitors include the Radical SR3 and Norma M20 FC.
| Engine | Maximum of 8 cylinders and 3000cc, homologated by the FIA in Group N. |
| Drivetrain | Free, with a maximum of 6 forward ratios. Reverse gear is compulsory. |
| Maximum dimensions | Length: 4800mm |
| Width: 2000mm | |
| Height: 1030mm | |
| Front plus rear overhangs not to exceed 80% of the wheelbase. | |
| Difference between front and rear overhangs not to exceed 15% of the wheelbase. | |
| Bodywork | Open or closed cockpit |
| Rear wing | Maximum of 2 elements, which must fit within a 150x400mm cross section. Maximum span of 1800mm |
| Minimum weight (without driver) | Related to engine capacity |
| Up to 1000cc: 475 kg | |
| 1000cc - 1300cc: 495 kg | |
| 1300cc - 1600cc: 515 kg | |
| 1600cc - 2000cc: 535 kg | |
| 2000cc - 2500cc: 575 kg | |
| 2500cc - 3000cc: 625 kg |
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