Time Attack classing explained
The UK Time Attack Championship classes are broadly split into two categories – Club for modified road cars and Pro for extreme, race-style builds.
The Club category is subdivided into the following classes:
Pocket Rocket is open to cars with engines smaller than 1750cc when they left the factory. The regulations are fairly open and allow relatively extensive modification, with the only exception being engine swaps, which are forbidden.
Clubman and Clubman+ are for mildly improved street cars. Trackday modifications such as coilovers and brake conversions are allowed. Manufacturers’ interior and bodywork must be retained, and extensive engine modifications are forbidden. Whether a car falls into Clubman or Clubman+ depends on its power and general laptime potential – for example, a Mazda RX-8 could run in Clubman class and a Nissan GT-R in Clubman+.
Club Classic & Retro is for cars designed before 1992. The rules permit relatively extensive modification, with the exception of flat floors, a significant aerodynamic aid.
Club 2WD and Club 4WD are the most modified of the Club classes, with extensive aerodynamic changes permitted, and engine upgrades and swaps are completely open. Flat floors are not allowed. Club 2WD is open to cars that are front-wheel-drive and rear-wheel-drive and Club 4WD is open to cars with all-wheel-drive or 4-wheel-drive.
The Pro category is subdivided into the following classes:
Pro Classic & Retro is for cars designed before 1991. The rules permit extensive modification, including the running of flat floors and upgraded gearboxes.
Pro class bridges the gap between Club Pro and Pro Extreme, allowing extreme modifications and mandating the use of the championship’s control slick tyre.
Pro Extreme is Time Attack’s halo class. Anything goes – here be carbon fibre-bodied, fire-breathing monsters! Cars must run the championship’s control slick tyre and the highest-spec cars run laptimes comparable to Formula-style single-seaters.
There are subtle additional variations between each class, as detailed in the championship's technical regulations – this is just a broad outline. Classes can be amalgamated, split, removed or otherwise altered at the championship organisers' discretion.
Image credit: Thunderwood Racing #23 'Disastra', as snapped by Jonathan Moore