All classes below can be raced by Ladies and Men!
Class 1 / Juniors 
Class 1 This class was previously restricted to 1000 cc Minis, but the Fiat Cinquecento and Citroën AX have been added in recent years. As with all Autograss cars they have the trim, dashboard and seats removed. The engine is standard with very little modification allowed. For the Minis, the only engine capacity allowed is 998cc, in either the A series or A+ types. A roll cage is installed and fire extinguisher fitted, within easy reach of the driver. Juniors, ages 12 - 16, are allowed to drive class 1 cars in separate junior races.
Class 2
Class 2 is open to front or rear wheel drive cars up to 1300cc. The engine can be either front or rear, and both are popular. Cars seen most regularly in this class are Nissan Micras and Vauxhall Novas. Previously Mk2 Escorts were popular in this class. Only 2 valve/cylinder cars are allowed and there is a minimum length requirement, preventing use of 1275cc Minis. The inlet tract is fitted with a restrictor, to even out performance amongst the vast collection of vehicles used.
Class 3 
Class 3 is the first of the unlimited capacity classes. Unlimited modifications and unlimited capacity are allowed; the only restrictions are front engine and rear wheel drive. Previously limited to 2 valves per cylinder but 16v engines are now permitted. This leads to very powerful cars with little weight over the driving wheels, and very sideways action.
Class 4 
Class 4 is a modified class, with engine capacities allowed up to 1130cc. Any engine modification is allowed, except turbo and super charging. This is a class not for the shallow of pocket; engines are extensively modified to bring them to a competitive level, as a specific of the rules is that the original engine and position are retained.
Class 5
Class 5 is a very popular starting point for people wanting to drive modified saloons. Engine capacities from 1131 to 1420cc are allowed, the engine does not have to be the original or in the original position. A lot of cars run rear engines to help improve grip.
Class 6 
Class 6 is for cars with unlimited engine capacity and modifications in a front engine/front wheel drive combination. Costs to compete at the top level can be high.
Class 7
Class 7 is restricted to rear wheel drive cars. The engines are unlimited, but must be above 1421cc, or 1000cc if a bike engine. Even two engines may be run, as is the case with the bike engined cars. Quite often large amounts of money are spent on the engines for these cars, including large block American V8s, and V6s of different types, all highly tuned.
Class 8
Class 8 is the most competitive of the special classes and is also the one with the lowest engine capacity limit, a maximum of 1420cc. In the vast majority of cars bike engines are used, even though they infrequently reach the engine capacity limit of 1350cc. Engines may be tuned, but as usual with capacity-limited classes may not be turbo or super charged. All cars are mid-engined; this is not part of the regulations, but is the best way to get the most weight over the wheels. With the large grids this class attracts it is one of the best to watch.
Class 9
Class 9 This class combines the high power output of the modern 2.0 litre engine with the lightness to allow better handling than the heavier class 10 vehicles. The capacity limits are between 1421cc and 2070cc and any modifications are allowed, with the usual exception of turbo and supercharging. All cars are mid-engined with most utilising a transverse gearbox layout and rear wheel drive, Vauxhall, Peugeot and Honda 16v units are all popular in this class in various states of tune with power in the 180-260 bhp range.
Class 10
Class 10 is one of the most powerful classes around. Another of the purpose built classes, this one has a minimum capacity of 2071cc but no upper capacity limit or limit on the modifications made to the engine. Twin bike engines are popular with the capacity limits being between 1550cc and 4000cc, as is V8 power. Once again all cars in this class are mid-engined, again for no other reason than that it seems to be the best solution. Phenomenal amounts of money can be spent to gain competitiveness in this class, with fully-built cars costing more than some small houses.
F600
F600 Founded in 2002 by a number of Leewood Autograss members, the F600 class is in essence an introductory specials class which runs to class 8 specifications with further restrictions imposed, the main stipulation being all cars must run a standard 600cc motorbike engine. This is an attempt to reduce cost and increase the quantity of specials racing at club level.
It has been proven that a brand new F600 with all new components can be built for less than £3500.
Click here to find out more.
Stock Hatch
Stock Hatch Standard Hatch-Back cars up to 1600cc which can only be slightly modified using standard parts from the same manufacturer. Either a NASA class 5 or more usually a Class 6 but built on a tight budget as a very low cost introduction to Autograss racing.
Click here to find out more about Stock Hatch.
Pictures provided with kind permission Jeffrey Parish and Andrea Boerngen - Autograss Review