Classes on the day may be amalgamated if there are less than three entrants, however championship points will be awarded for all classes.


8.6.1 Class 1 – Production: A Production vehicle is defined as a 4WD model having been produced in quantities of not less than 500 per annum, regardless of engine capacity.  It must have been available through a dealer network, when new, and must be to standard European specification, as detailed in the vehicle’s handbook.  It is the competitor’s responsibility to provide evidence if required, of the vehicle’s eligibility.

No modifications not expressly authorised hereafter, save those necessary to comply with safety regulations, may be made to the vehicle.

A: Engine

1. The accelerator cable may be replaced or doubled, with or without parts from the original manufacturer.

2. The make and type of spark plugs are free, as are rev limiters and high tension cables and the ignition coil, where fitted.

3. The capacity and origin of the cooling system radiator/tank is free, as is the type of thermostat which may be removed.  The original location and attachment points of the series production radiator must be retained. Those parts of a carburettor or fuel injection system which regulate the admission of fuel to the engine may be modified, provided that the modification has no influence on the admission of air.

4. The original fuel injection system must be retained; the injectors may be changed for injectors which are identical except for the size of the pintel nozzle hole at the end.

5. The air filter, its housing and the tube between this housing and the atmosphere are free, but the housing must remain in its original location, the air must not be taken from the cockpit, modifications must not affect the structure of the car, and the installation must be situated entirely within the engine compartment.  The air filter element may be removed.

6. The valve springs and valve clearance are free, but the camshafts (including their profile) must remain as original.

7. The fuel pump is free, in operating principle, number and location outside of the cockpit.

8. The material of the engine mountings is free, but the number and location must remain as original.

9. The exhaust system after the first silencer is free, except that it may not be replaced with a system of a larger diameter than that fitted upstream of the first silencer.  The exhaust system must retain the original number of silencers and cataltic converter if fitted (from 2011), although additional silencers may be fitted.  It shall be permissible to alter the exit point of the exhaust system either to the rear or sides of the vehicle provided that no alteration to the bodywork is made and the installation respects Construction and Use Regulations.  Additional mounting points for the exhaust system may be fitted.

10. Where fitted the Cruising Speed Controller may be disconnected.

11. Sound proofing panels may be removed.

B: Transmission

1. The clutch disc is free, including its weight, except for the number of discs and their diameter.

2. Standard transmission ratios must be retained.  Optional extras are prohibited. Locking and limited slip differentials or traction control devices are only permitted if available as a Standard fitment.

C: Suspension

1. Springs

Coil Springs: The length, diameters external and of the wire, the form of the spring platform and the type of spring (progressive or fixed rate) are free.

Leaf Springs: The length, width, thickness, vertical curvature and number of leaves are free.  The fitting of shackle protection pads is strongly recommended.

2. Torsion Bars

The diameter is free.

3. Shock Absorbers

(a)Are free, but the type telescopic, lever etc., and operating principles (hydraulic, friction, etc.,) must be retained as original.

(b) Gas filled Shock Absorbers will be regarded as hydraulic in respect of their operating principle.

(c) The mountings must be retained as originally fitted and may not be reinforced.

(d) It shall be permitted to fit an additional shock absorber at each wheel station, provided that the mounting’s only purpose is the fitting of the additional shock absorber.

(e) The fluid tanks for the shock absorber may be attached in the wheel arches as well as to the chassis.

(f) Suspension travel straps are permitted.

4. Rigid axle. Where fitted, the original casing may be strengthened provided the original part can still be recognised.

D: Wheels and Tyres

1. Wheels  are free tyres must be from MSA (L) Permitted Tyres List 5 (a or b) provided that they remain covered by the original bodywork, including wheel arch extensions where originally fitted, and where no modifications may be made to the bodywork to permit their fitting.  Studded tyres are prohibited.

2. The spare wheel may be relocated inside the vehicle provided that it is securely restrained and does not impinge on the space reserved for the crew.

3. Wheel fittings by bolts may be changed to stud and nut fittings.

E: Braking System

1. The brake linings are free as is their mounting to the backing plate (riveted, bonded etc.) provided that the contact surface of the brakes is not increased.

2. Protection plates may be removed or reshaped.

3. In the case of a car fitted with servo-assisted brakes or an anti-locking device, this device may be disconnected.  The same applies for anti-lock braking systems.

4. Brake hoses may be changed for aviation type lines.

F: Bodywork

1. Exterior

(a) Hubcaps must be removed.

(b) Protective headlight covers may be fitted provided that their only function is to cover the glass, and they have no influence on the car’s aerodynamics.

(c) The fitting of under body protection plates is recommended provided that their only function is to protect the following parts:- engine, radiator, suspension, gearbox, tank, transmission and exhaust.

(d) A nudge bar may be fitted, in addition to the bumper, and must be independent of and not reinforce the car’s structure or contribute to its rigidification.  This bar must be made of tubes and may be mounted to the original bumper or chassis and may only be so constructed so as to provide protection to the headlights and provide mountings for auxiliary lights.

(e) The side and rear windows behind the driver may be replaced with non transparent material or transparent material of at least 4mm in thickness.  Openings originally made up of a number of panes may be replaced with a single pane or panel.  The fixation and mechanisms of these windows and those of the windows in the side doors are free.

(f) The glass panel of the sunroof must be replaced with a panel of the same material as the roof of the car and must be at least 1.5 mm.

(g) The locking system for the cap of the fuel tank is free.

(h) Where an externally mounted spare wheel is relocated inside the vehicle it shall be permitted to remove the original external wheel mounting.

(i) External rear view mirrors, and front and rear windscreen wiper blades are free.

(j)Only electric winches which require no modification to the structure of the car other than to facilitate the attaching of the winch by bolts may be fitted.


(a) All accessories which have no effect on the car’s behaviour are allowed without restrictions, such as those concerning the aesthetics or interior comfort (lighting, heating etc.,) on the express condition that they do not influence, even in a secondary manner, the efficiency of the engine, steering, strength, transmission, braking or road holding.

(b) All the passenger seats, if occupied, must be fitted with head restraints.) Rear seats,parcel self,load aera covers may be removed.

(b2) All padding and insulation may be removed from underside of roof.

(b3) All door cards and rear lower trim under the rear window line must be in place,trim may be adapted only to facilitate     the fitting of ROP's 

(c) The carpet behind the front seats may be removed when an FT3 tank is fitted in that area.

(d) All the controls must be those provided by the manufacturer and they must retain their original function, but may be modified to improve their ease of use (extension to handbrake lever, additional flange to brake pedal, etc.).

The following are allowed in particular:

i) Additional measuring instruments, counters etc. May be freely installed provided that they do not present a danger.

(ii) The horn may be changed, and an additional one fitted which may be operated by the passenger.

(iii) The mechanism of the handbrake lever may be modified to fly-off operation.

(iv) The seats occupied by the crew are free, and the seat supports may be strengthened.

(v) Additional storage compartments may be added to the glove compartment and front doors.

(vi) The steering wheel is free.

(vii) Electric window mechanisms may be converted to manual operation.

G: Reinforcements

1. Strengthening of suspended parts is permitted where the strengthening material follows the shape and is in contact with the suspended part. It is permitted to fit strengthening bars to the suspension points on the body shell or spring mounting points, provided that the bars are attached by bolts and are removable.  It is permitted to make holes in the suspension trim to attach the bars.

2. When the spare wheel is originally located within an enclosed space it shall be permissible, when carrying a wheel wider than that originally fitted, to remove the cover and or sufficient material to allow the wider wheel to be carried within the space provided.

H: Electrical System

1. The battery and associated cables are free, save that the battery must be located in its original position using the original mountings.

2. The Alternator is free.

3. Fuses may be added to the electrical system.

4. A maximum of 2 auxiliary forward facing lights, and their associated relays etc.  may be fitted, but which may not be fitted within the bodywork. Additional reversing lights may be fitted which may only be operated when reverse gear is engaged. In all other respects the lighting system must respect current legislation.

I: Fuel System

Where an FT3 tank is fitted fuel lines must be replaced with the aviation type.  Where the original fuel tank is retained it is permitted to change the fuel lines to the aviation type.  It is further permitted to feed the original tank from the FT3 tank provided that the breather pipe passes through the FT3 tank.  In all cases the routing of fuel lines are free except that they may not be routed inside the roll cage or chassis members.

J: Jack

The jack is free and the jacking points may be changed for others which have no other function.

8.6.2 Class 2 Modified Production:

A Modified Production vehicle is defined as a 4WD model having been produced in quantities of not less than 500 per annum, regardless of engine capacity.  It must have been available through a dealer network, when new, and must be to standard European specification, as detailed in the vehicle’s handbook.  It is the competitor’s responsibility to provide evidence if required, of the vehicle’s eligibility.

All modifications authorised for Production Cars are permitted for Modified Production Cars together with those contained in these specific regulations. No modifications not expressly authorised hereafter, save those necessary to comply with safety regulations, may be made to the vehicle.

A: General Prescriptions

With the exception of those parts hereafter authorised for modification [or], replacement, all other parts may be machined, balanced and/or chemically treated provided that it is possible to identify those parts so modified as being originally fitted components, irrespective of the supplier.

Throughout the car all nuts and bolts/screws are free, as are the type of locking device (i.e., washer, locknut etc.).

B: Engine

1. The engine must originate from the base car or from a car from the same make.  The engine must be in its complete and integral form, save for modifications authorised hereafter.

2. The nominal capacity of the engines shall be limited to:

(a) Petrol Engines:

5,000cc for normally aspirated 2 valves per cylinder engines.

3,500cc for engines with more than 2 valves per cylinder and/or forced induction.

(b) Diesel Engines:

6,000cc for normally aspirated 2 valve per cylinder engines.

4,000cc for engines with more than 2 valves per cylinder and/or forced induction.

(c) Cylinder block - Cylinder head

(i) It is permitted to close the unused apertures in the cylinder block and cylinder head provided that the only purpose is that of closing the aperture.

(ii) A rebore is allowed provided the original cylinder block is retained, resleeving of the bore is allowed under the same conditions and the material of the sleeve is free.

(iii) Planing of the cylinder block and head is allowed.  In the case of rotary engines the dimensions of the Inlet and exhaust tracts are free provided that the original dimensions of the inlet and exhaust ports are respected.

(iv) The Compression Ratio is free.

(v) The Cylinder Head Gasket is free.

(vi) The Pistons, Piston Rings and Gudgeon Pins are free.

(vii) The Connecting Rods and Crankshaft.  In addition to the modifications permitted in the paragraph ‘General Prescriptions’, the original crankshaft and connecting rods may receive chemical, heat or mechanical treatment different from that specified for production parts.

(viii) Bearings:  These are free except that they must be the original type of bearings and they must be to the original dimensions.

(ix) The Flywheel may be modified in accordance with the prescriptions of the paragraph ‘General Prescriptions’ provided that the original flywheel can still be identified.

(d) Fuel and Air Feed

(i). The air filter, its housing and the plenum chamber are free.  The air filter and box may be removed, replaced by another or relocated within the engine compartment.  The pipe between the air filter box and the carburettor(s) or the air measuring device (injection) is free, as is the pipe between the air measuring pipe and the inlet manifold or the super charging device.

(ii). The air filter may be fitted with a grille.

(iii). Anti pollution parts may be removed provided that their removal does not lead to an increase in the amount of air admitted to the engine.  It is permitted to make a hole, of a maximum diameter of 10cm in the engine cover or bonnet to provide air to the engine and to connect a pipe of a maximum internal diameter of 10cm to this hole.

(iv) The Fuel pumps are free except that they may not be fitted inside the cockpit unless they were originally

located in this position in which case they must be adequately protected.

(v) It is permitted to fit a radiator in the fuel circuit.

(vi) Fuel filters are free except that they shall not exceed a unit capacity of 0.5 litre and may be added to the fuel circuit.

(vii) The original heat exchangers and intercoolers to the petrol engine fitted must be retained and remain in their original location.  In the case of diesel engines these are free but must remain within the engine compartment and the bodywork must not be modified to allow their fitting.

(viii) The pipes between the supercharging device, the intercooler and the manifold are free but their only function may be to carry air.

(ix) Water injection, if fitted, must be as originally fitted to the engine type in all respects.

(x) The use of any other substance or device to reduce the temperature of the mixture is forbidden.

(e) Carburettor

The replacement of the standard carburettor with a single progressive single or twin choke carburettor is Permitted provided, in the case of a single choke carburettor, the area of the single choke does not exceed 2 inches or 50.80mm and, in the case of a twin choke carburettor, the area of each choke does not exceed inches or 35.93mm.  If an SU carburettor is used, the size of the choke will be the size of the butterfly flap for the purpose of the above measurements

(f) Injection

(i) The injection system original to the vehicle must be retained in type and location.  The parts of the injection system regulating the quantity of fuel admitted to the engine may be modified, but not the diameter of the opening of the butterfly.

(ii) The air measuring device is free.

(iii) The injectors are free, except for their number, position, assembly axis and operating principle.

(iv) The fuel lines feeding the injectors are free.

(v) The electronic box is free provided it does not incorporate more data.

(vi) The fuel pressure regulator is free.  In the case of a diesel engine the injection pump is free.

(g) Restrictor (supercharged engines only)

The restrictor shall be of a maximum diameter of 34mm for petrol engines and 40mm for diesel engines and shall comply fully with FIA Appendix J requirements. In the case of engines with two parallel compressors the maximum diameter will be 24mm for petrol engines and 28.2mm for diesel engines.

(h) Camshafts

The camshafts are free except their number and number of bearings.  The timing is free. The material, type and dimensions of pulleys, chains and belts for driving the camshafts are free.  The route, and the number of belts or chains are free, as are the guides and tensioners associated with the belts or chains.

(i) Valves

The material and the shape of the valves are free, as is the valve lift, but their original dimensions must be maintained.  The cups, cotters or guides (even where not originally specified) are free.  Shims may be added under the springs.  The valve seat material is free.  The valve springs are free as to number, material, length and number of coils, but their location must be as original.

(j) Rocker Arm and Tappets, Push Rods

Rocker arms may only be modified as prescribed in the General Conditions. The Tappets and Push Rods are Free provided that they are interchangeable with the original parts.

(k) Ignition

The ignition system is free except that the number of spark plugs may not be increased.  It is permitted to Convert a mechanical ignition to electronic ignition system and vice a versa.  Where the system is so converted only those modifications to fit the necessary components are permitted.

(l) Cooling

The radiator is free, as are its mountings provided that it remains in its original location (compartment). The Cooling hoses and fittings are free.  A radiator screen may be fitted.  The type, location, material and number of fans are free.  The thermostat is free and may be removed.  A water catch tank may be fitted and the radiator cap may be locked.  The expansion tank is free, and one may be added where not originally fitted.  If water injection was originally fitted it may be disconnected but not removed.

(m) Lubrication

(i) Radiator, oil/water heat exchanger, lines, thermostat, sump, oil pump and filter are free.  The oil radiators must be located within the original parameters of the car, including the underneath of the car.  Fitting of an oil radiator does not allow the fitting of an enveloping aerodynamic structure.  All air openings must have the sole effect of inducing the necessary air for the cooling of the radiator, and must not have any aerodynamic effect.

(ii) Oil pressure may be increased.  If the lubrication system includes an open type breather then it must be equipped with an oil catch tank into which the oil will flow.  This catch tank shall be at least 2 litres for cars up to 2,000cc, and at least 3 litres for cars of 2,000cc and above.

(n) Engine Mountings

Mountings are free provided that the position of the engine respects the original layout (longitudinal, transverse), and that the engine remains in its original half of the wheel base.  The only possible modifications to this compartment are those made necessary by the difference in space requirement between the original engine and the permitted alternative engine.  The incline may be modified.  Supports may be welded to the engine and to the bodywork and their position is free.  It is permitted to modify the bulkhead for the installation of one or more air filters or for the admission of air provided that this arrangement is totally isolated from the admission of air into the cockpit.

(o) Exhaust

Downstream of the original exhaust exit the system is free except that the exit must remain inside the car’s perimeter.  For cars with turbochargers the exhaust can only be modified after the turbocharger.  In the case of rotary engines, provided the inlet ports of the exhaust manifold are respected, the dimensions of the ducts are free. Thermal screens may be fitted to the exhaust manifold, the turbocharger, and the exhaust system provided their only function is that of a thermal screen.

Driving pulleys and belts for ancillaries situated outside the engine:

The material, dimensions and type of pulleys are free, chains and belts for driving the ancillaries are free.  The route and the number of belts and chains are free.

(p) Gaskets are free.

(q) Springs

Springs are not subject to any restrictions other than that they must retain their original operating principle.

(r) Starter Motor

The Starter Motor must be retained, but its make and type are free.

(s) Supercharging Pressure

The pressure may be modified under the ‘General Prescriptions’ and ‘Engine springs’ as specified above. The connection between the housing and the waste gate may be made adjustable if it is not originally so. The original system of operation of the waste gate may be modified and may be rendered adjustable, but the system must be retained.  A mechanical system must remain mechanical, and an electrical system must remain electrical etc.

C: Transmission

1. Clutch - The Clutch is free.

2. Gearbox, transfer box, final drives, differentials and their casings: These are free.  An additional lubrication and cooling device is allowed (circulation pump, radiator, and air intakes situated under the car) in accordance with the prescriptions listed under Lubrication above. The gear box supports and drive shafts are free.

D: Suspension

The suspension is free.  The axles are free and may be substituted.  Reinforcement bars may be fitted to the suspension mounting points.  The distance between the fixing point of the suspension and the anchorage point of the reinforcement bar must not be more than 100mm, unless the bar is a transversal strut with a roll bar as originally fitted, and unless there is an upper bar fixed to a MacPherson suspension or similar.  In the latter case the maximum distance between the anchorage point of the bar and the upper articulation point will be 150mm. Apart from these two points, this bar must not be mounted on the body shell or the mechanical parts. One and the same bar may only be fixed to 2 of these points situated on the original chassis (body shell).

E: Wheels and tyres

Same as For Production Class

F: Brakes

Brakes are free except for the following:

Cooling of brakes. Only one flexible pipe to bring air to the brakes of each wheel is allowed, but it’s inside section must be able to fit within a circle with a 10cm diameter. The air pipes must not extend beyond the parameters of the vehicle when viewed from above.

G: Steering

The steering is free, including the housing, however the original operating principle must be retained.

H: Bodywork and Chassis

1. Modifications to the body shell and chassis made necessary to allow for modifications authorised above are allowed.  Fixed bulkheads may be rendered movable on condition that this does not modify their ability to prevent the passage of liquids and flame.

2. Strengthening of the sprung parts of the chassis and bodywork is allowed provided that the material used follows the original shape and is in contact with it. Reinforcements by composite materials are allowed irrespective of thickness.

3. Insulation material may be removed from the body shell and chassis.

4. Unused supports (i.e. spare wheel carrier) may be removed.

I: Exterior

The external contours and shapes of the car must be conserved in their entirety, except as permitted below:

(a) Bumpers, roo-bars: materials are free but the original shape and attachment points must be retained. A roo-bar may be fitted provided that it is entirely made of tubes and that it is mounted to the bumper. Its only function may be the protection of and mounting of auxiliary lights.

(b) Hub caps and wheel embellishers:  must be removed.

(c)  Windscreen wipers: The system is free in all respects save that it must comply with Construction and Use requirements.  The washer reservoir may be relocated inside the cockpit, the number and capacity are free.

(d) External decorative/rubbing strips may be removed.

(e) Jacking points are free as to type, location and number but must have no other function.

(f) Light covers may be fitted provided their only function is protection and that they have no aerodynamic effect.

(g) The location and type of registration plates are free provided that they comply with Construction and Use requirements.

(h) Additional safety fastenings for the windscreen and other windows may be fitted provided that they do not improve the aerodynamics of the car.

(i) Under vehicle protection may be fitted to protect the engine, radiator, suspension, transmission, fuel tank and exhaust.  These parts may have no other function than the protection of those specified parts. Wing extensions may be fitted, covering at least one third of the tyre’s circumference, and being no greater than 5cm wide and 10cm tall in section.

(j) It is permitted to fit plastic protection parts inside the wings and the edges of the wing panel may be folded back if they protrude inside the wheel housing.

(k) Removable pneumatic jacks are permitted.

(l)  Skirts are prohibited.  No parts may be fitted between the sprung part of the car and the ground whose function is to fill this space.

(m) It is permissible to remove or replace existing supports between the body and chassis, but is not permitted to change or add locations.

(n) The materials of the doors, bonnets and boot lids, handles and hinges are free, provided that their external appearance and operation is retained.

(o) The material and operation of the front lateral windows are free.  The windows must be transparent and at least 3mm thick.

J: Cockpit

1. No mechanical parts may protrude into the cockpit.  Modifications to the cockpit must not be dangerous for the occupants of the vehicle especially in the event of a crash.

2. The dashboard is free but must not have any protruding parts.

K: Seats

1. The front seats are free and may be replaced, they may be relocated rearwards but the seat back shall not be behind a vertical line defined by the leading edge of the rear seat as originally fitted.

2. Rear seats and parcel shelves/load area covers may be removed. All padding and insulation material may be removed from the underside of the roof.

3. Insulating and padding may be removed from the floor, the carpets are free and maybe removed. All other padding and insulation may be removed from the car.

4. The heating system is free and may be removed. Where the system is removed an electric demisting system or similar must be fitted. Air conditioning may be disconnected or removed.

5. The steering wheel is free and the steering lock may be removed.

6. It is permitted to install a ventilation flap in the roof in accordance with the following conditions:

(a) maximum height 10cm.

(b) displacement within front third of roof area.

(c) hinges on the rear edge.

(d) maximum width of 50cm.

L: Additional Accessories

All those which have no influence on the car’s behaviour, power or performance are allowed.  All controls must retain their intended function and may be adapted for ease of use and accessibility.  All gauges and measuring devices are free and may be added or deleted.  However a speedometer must be fitted.  The horn may be added to and changed.  Circuit breakers are free as to number and location.  The original windscreen may be replaced with a laminated windscreen with an integral defrosting device fitted.  A fly-off handbrake mechanism may be fitted.

Spare wheels must be securely fitted and must not intrude on the space reserved for the crew members.  No external bodywork modifications may result from the spare wheel’s installation.  Additional compartments may be added to the glove compartment and pockets added to the doors.  Additional insulation to protect the vehicle’s crew from fire may be added to the bulkheads.  The joints in the gear linkages may be changed.

M: Electrical System

1. The nominal voltage of the original system must be retained.

2. The wiring harness & fuses are free as are the routing and location of the same.

3. The battery (ies) is free but must be securely fitted and covered to avoid leaks and short circuits.  The original number of batteries must be retained.  Where the battery is relocated it must be attached to the body using a metal sheet and two metal clamps fixed to the floor by nuts and bolts of 10mm diameter, with 3mm thick reinforcements at the securing holes of 20cm2.  The battery must be covered by a leak proof box and where installed behind the front seats within the cockpit the box must be ventilated to the exterior of the vehicle. The generator is free but must retain the original drive system. Its location is free and may only be located inside the cockpit if that was the original location.

N: Lighting

The car’s lighting must respect the lighting requirements of the current Motor Vehicles’ Lighting Regulations.

Apart from that requirement the lighting systems are free and the location of the indicators and parking lights may be modified. Where this is done the original orifices must be sealed. Additional or alternative reversing lights may be fitted and may be incorporated into the bodywork but may only be illuminated upon the engagement of reverse gear. The fitting of additional forward facing lights may be subject to restriction by event supplementary regulations.

8.6.3 Classes for Special Off-Road Vehicles: With the addition of single seated vehicles which are to be included and classified as follows.

Forced induction please refer to Reg 9.4(d) Tech Regs

CLASS 3: Two wheel drive vehicles.

CLASS 4: Diesel engine 4x4 Vehicles

CLASS 5: Petrol engine leaf sprung vehicles up to any engine capacity.

CLASS 6: Petrol engine vehicles up to and including 2500cc, non-leaf sprung.

CLASS 6i: Petrol engine vehicles up to and including 2500cc Independant suspension

CLACSS 7: Petrol engine vehicles from 2501 cc to and incl 3600cc non-leaf sprung.

CLASS 7i : Petrol engine vehicles from 2501 cc up to and incl 3600cc, Independant suspension

CLASS 8: Petrol engine vehicles over 3601cc non-leaf sprung.

CLASS 8i: Petrol engine vehicles over 3601cc, Independant suspension