10.2. Vehicles should not use any locked or lockable torque biasing or limited slip differentials or any other automatic device which is designed to achieve the same result.
10.3. Any clutch / torque converter attached to the engine flywheel must be bolted directly to the engine crankshaft. 10.4. Gearboxes and transmissions with a sequential shift are prohibited.
11. Weight 11.1. Free.
12. Miscellaneous 12.1. Vehicles can have a starter motor mounted on either engine block or clutch cover. 12.2. Vehicles must comply with the silencing levels specified in Ch. 7 App. 8 Art. 2.
12.3. All measurements must be in accordance with these regulations when the car is unladen on a level horizontal surface.
12.4. Other than Ch. 7 and in the previous Articles of this Appendix there are no special requirements under Vehicle Regulations for: Chassis / Engines Suspension Brakes Steering Cooling Oil Systems Fuel Systems Electrical Systems Weight / Ballast Exhausts.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 17 Appendix 5- Technical Regulations – National Trials Car Formula
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