Rules and Regulations

Published Regulations

For every championship, we publish rules, or “regulations”, that are approved by Motorsport UK, these are in addition to the Motorsport UK Year Book (aka “Blue Book”).

The general ethos of the championship is that it should be possible to compete with an relatively standard car, with upgraded suspension, and do well without spending too much money.  The formula works well and produces a close competition where no single model of car is faster, over all events, than any other.  

All Models

  • Cars must use tyres from List 1A
  • Forced induction is not permitted
  • The standard intake manifold, plenum and throttle body must be retained and the standard ECU must be used without a “piggy-back” ECU, whether electronic or mechanical
  • Dampers must not have separate adjustment for high and low speed damping.  This means that double-adjustable coilovers are allowed but triple-adjustable coilovers are not allowed
  • An MX5 gearbox with standard internals must be used and only standard Mazda MX5 differentials from the appropriate model may be used
  • A hard top or soft top must remain fitted, but cars can compete open or closed
  • Motorsport UK approved; rollbars/cages, competition seats and harnesses may be fitted to any car
  • Cars must run in a road legal condition

Model Specific Rules

  • MX5 mk1 & mk2
    • Cars may run any brakes from the standard mk1/mk2 range
    • Final drive must be Mazda MX5 or Kia Sportage
  • MX5 mk3
    Cars must remain standard other than wheels, brake friction material, safety items listed above and dampers or coilovers complying with the rules in the ‘All Models’ section above 

For the avoidance of doubt, standard is as defined in Section B of the yearbook.