e.
Where the Vehicle is fitted as standard with an ECU then that ECU must remain fitted and as specified by the Championship Regulations.
f. |
The engine cooling system must remain standard to the Vehicle. |
g. |
Induction systems, inlet manifolds and exhaust systems must remain standard to the Vehicle. |
h. |
Performance air filters and exhaust back boxes are permitted. |
i. |
At any time the ASN may impose further restrictions to limit engine performance. |
j. |
The silhouette of the Vehicle must not be altered. |
k.
l.
m.
The bodyshell must be of the vehicle manufacturers specifications and minimum thickness with the exception of rear wings / rear quarter panels and removable parts and panels, which may be of alternative materials. Seam welding, and localised gussets / reinforcement is permitted.
The dashboard is to remain as standard, in the original position and the standard instruments retained and operable.
All other interior trim must be removed including carpets, roof lining and passenger seats. Interior door panels may be replaced with an alternate non-flammable material.
n. All window glass to be replaced with polycarbonate, Ch. 7 App. 2 Art. 22.9 applies. o.
Glass sunroofs are not permitted. Sunroofs may be of a non-shattering solid rigid material other than glass. Any sunroof must be firmly secured in the closed position. The sunroof aperture may be closed by solid metallic material permanently fitted in place.
p. An interior rear view mirror must be fitted to the Vehicle. q.
All Vehicles must have substantial underbody protection covering any area of both the fuel tank and engine sump exposed to running damage.
r. The handbrake system is to remain as standard. s.
The fitting of mud flaps of a flexible material of 4mm minimum thickness behind each wheel extending to a minimum of 40mm each side of the tyre tread and to within 80mm of the ground when the car is unoccupied is mandatory
t. Wheels must be of the standard production size and material applicable to the vehicle. u.
The steering column is to remain as standard( Part B App. 10 Art. 12.11. b) but the steering column locks must be rendered inoperative. The steering wheel and mounting hub are free.
v. Standard production gearbox and differential applicable to the Vehicle must be used. w.
The original method of suspension operation must be retained and utilise the mounting points as provided by the manufacturer. Shock absorbers and coil springs may be uprated and adjustable.
13.2. Safety
14. Historic Rallycross
13.2.1 In addition to the requirements of Art. 11 above and Ch. 7 Apps. 3 and App. 6:
13.2.2 Double longitudinal door bars must be fitted to the drivers side of the roll cage in accordance with Ch. 7 App. 13 Diagram 21. g, 21. h, 21. j.
13.2.3 Fire Extinguisher: must be plumbed-in in accordance with Ch. 7 App. 6 Art. 1 minimum.
14.1. ASN has created the Regulations for Historic Rallycross so that Historic Cars may be used for Competitions under a set of rules that seek to preserve the specification of their period and prevent modifications of performance and behaviour which could arise through the application of modern technology.
14.2. Historic Competition is not simply another formula in which to acquire trophies, it is a discipline apart, in which one of the essential ingredients is a devotion to the cars and to their history. Historic Motor Sport enables the active celebration of the History of the Motor Car.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 16 Part B( Rallycross) Appendix 10- Technical Regulations 596