available through the normal commercial channels of a land vehicle manufacturer. 15.6.3. Induction system free.
15.6.4. Oil coolers dry sump lubrication systems or additional water radiators are permitted within the periphery of the bodywork.
15.6.5. Must be capable of being started from an onboard power source operable by the Driver when seated normally.
15.6.6. Engine and transmission must remain in a similar position within the Vehicle and in the same position relative to each other as in the original model.
15.6.7. Modified Cars – Electrified Series Production: no modifications to the electrified propulsion system or powertrain are permitted.
15.7. Transmission
15.7.1. Transmission layout to remain as original. 15.7.2. Gearbox and differential are free. 15.7.3. Driven axle( s) free( see Art. 15.8.4).
15.7.4. Modified Cars – Electrified Series Production: no modifications to the electrified propulsion system or powertrain are permitted.
15.8. Suspension
15.8.1. Additions and modifications to springs shock absorbers or suspension height are free.
15.8.2. The original type of suspension must be maintained( e. g. twin wishbone set-up cannot replace a single wishbone suspension; a sliding pillar cannot be replaced by a MacPherson strut; a trailing link cannot be replaced by wishbones or coaxial springing).
15.8.3. A live rear axle may not be replaced by an independent system or De Dion.
15.8.4. A live rear axle is allowed location links. If lever-arm shock absorbers are an original fitment they may be replaced by a single location link.
15.8.5. Suspension pick-up point positions may be altered providing the suspension system is maintained as being the original type.
15.8.6. Road springs are free.
15.8.7. The wheelbase must be to the dimensions of the original Vehicle plus or minus 2 % or 5cm whichever is the greater.
15.9. Electrical
15.9.1. Electrical generators may be disconnected or removed.
16. Regulations for Sports Libre Cars 16.1. Vehicles that comply with any of the following Groups:
a.
Any closed wheel Vehicle that does not comply with any other category as defined in these Regulations.
b. Bespoke electrical Vehicles compliant with Ch. 7 App. 11 Art. 1.11. c.
Sports Racing Cars d. Single seat closed wheel Racing Car the rear wheels enclosed by continuous bodywork.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 14 Appendix 4- Technical Regulations 543