SISU Motorsport League General Rulebook

Updated: May 26, 2026


This document outlines the core sporting regulations for the SISU Motorsport League. We focus on high-quality driver championships in iRacing, primarily featuring GT3 machinery. We maintain a serious approach to on-track etiquette, officiating, and sportsmanship.


1. League Philosophy & Participation

  • Open Eligibility: Anyone may join regardless of safety rating, iRating, license level. SISU Motorsport Endurance team membership is not required.
  • Serious Approach: All drivers must compete with a professional, respectful mindset unless explicitly marked as a fun event.
  • Driver Championships: The primary focus rests on individual driver standings.
  • Event Documents: Specific formats, schedules and points are detailed per event.


2. Onboarding & Registration

  • Website Entry: Drivers must register on the official SISU Motorsport website.
  • iRacing League: An official application must be submitted within the iRacing UI (League ID: 10546).
  • Discord: Joining the SISU Motorsport Discord is mandatory for communication and briefings.
  • Name Accuracy: iRacing display names must match website and Discord profiles (handled automatically).


3. Communication & Media

  • Official Channel: Discord serves as the primary notice board for all race details.
  • Event Briefings: Text or voice briefings will be published before every race.
  • Live Broadcasts: Events are streamed on the SISU Motorsport YouTube channel.
  • Stream Decorum: Driver behaviour, paint schemes, and chat must remain sponsor and family-friendly.
  • Radio Etiquette: The in-game voice chat must remain silent during all competitive sessions (excluding practice and fun events). Drivers may join league discord voice chat. Teaming up during non-team sessions, showdowns, swearing and insults in chat are prohibited.


4. On-Track Conduct

This is a common rules for all competitive events. This list may be extended or shortened on event-by-event basis and all changes would be published in Event Specific Rulebook no later than 2 days before the session start. If some specific rule is not listed here refer to iRacing Sporting Code and use the catch-all rule: If you're unsure or don't have a rule for a specific situation, use common sense and treat others as you would like to be treated. Or ask team principals or Stewards.

  • Avoidable Contact: Drivers must prioritize safety and clean racing over track position.
  • Weaving on Warm-Up: drivers are allowed to warm up tires on Parade lap on their half of the track. Warm Up should stop no later than 2nd corner before start-finish line.
  • Start Procedure: follows iRacing Sporting Code if not defined in Event Specific Details. The leader must maintain consistent speed and could start a race at any time after Pace Car off the track. Drivers should not leave more than 3 car lengths to car ahead or pace car at any time during pace lap and keep consistent speed.
  • Pace Car: may be deployed at any time in the race on Race Director discretion to neutralize the race after the incident. Additional conditions or randomization described in Event Specific Rulebook. Drivers must follow iRacing Sporting Code regarding Safety Car procedures.
  • Track Limits: Defined strictly by the iRacing software and off-track incident counter. Abusing off-tracks to gain advantage is considered cheating and may be protested. Incidents limits described in Event Specific Rulebooks.
  • Overtaking: The passing driver must execute the move safely. If any car have significant overlap it deserves the space. Respect the lead - don't hit what you can see and remember about Accordion effect in braking zones.
  • Significant Overlap: car deserve the space if it's front axle at least alongside with rear axle of opponent car, or vice versa. Overlap should be accomplished before turn-in point. On straights or curves that considered as straights (any corner that could be taken flat 2 wide) significant overlap is any overlap and both cars deserve the space. Usually this straights are described in Event Specific Rulebooks. Good example - start-finish straight on Imola.
  • Side Note: you have to leave the space for the car, but if you leave more as precaution - it's a recipe for disaster. Then you won't see opponent and your lines and speed would be very different which may lead to hard crash instead of small door-to-door rubbing with closer lines.
  • Squeezing: is allowed before the braking zone, but you should remember that it's a very dangerous move and should be executed safely. Squeezing in braking zone is prohibited.
  • Respect the Vortex of Danger: If you have not achieved significant overlap before turn-in you have no right to be there. Once a driver is turning in, they aren't driving in their mirrors, so you should assume that a car ahead WILL hit the apex and the exit.
  • Defending: Defending driver must choose their line in advance and hold it. Defending is not allowed in Practice and Qualifying Sessions.
  • Blocking: is forbidden. Defending driver should not perform reactionary moves and moves under braking.
  • Breaking a Tow: is allowed if trailing car is not in close proximity (1-2 car lengths).
  • Bump-Draft: considered as intentional contact. It's not forbidden per se, but bump drafting driver takes all responsibility on the manoeuvre and consequences - losing control, net code bugs, damages. This action may be protested.
  • Unsafe Rejoins: Driver must wait for a clear track opening before returning to the line.
  • Yellow Flags: drivers must be cautious and proceed with appropriate speed. If driver's field of view is blocked or potential danger could not be estimated - driver must slow down to assess the situation. Hope on luck, taking advantage of slower cars in yellow flag conditions are protestable.
  • Blue Flags: are informational only. Driver must not defend on passing car but not obligated to move out of the line or slow down.
  • Out Lap: drivers on their out lap in Practice or Qualifying sessions should let the car on hot lap by in predictable manner without interruption to their lap.
  • Losing Control: driver who lost control should accept it and hold the brakes. This is not a measure to help you regain it - holding the brakes makes your car predictable for other drivers. Rolling back and forth after the incident without full-stop is a risky and protestable offense.


5. Post-Race Stewarding & Protests

  • Independent Panel: A dedicated steward group reviews incidents after the race.
  • Publicity: stewards review incidents in open voice chat in Discord and any driver can join it and discuss incidents or get clarification on decisions. Last word for all decisions is by stewards.
  • Automated Incidents: In-game penalties (e.g., slow downs, black flags) cannot be overturned.
  • Protest Window: Submissions open post-race and close 24 hours post-race.
  • Evidence Submission: Protests must be filed via the Discord with lap number and clear description.
  • Protest results and corrected Standings are published within 24 hours after the protest window closing, along with any disciplinary action taken against the offender. The protester remains anonymous. Stewards reserve the right to take action on any incidents including those that have not been reported. The stewards' decision is final.
  • The decision may include a warning, a penalty in points or seconds, a ban from the next qualification(s), race(s), or a ban from the league.
  • Retaliation: Intentional wrecking results in an immediate, permanent league ban.


6. Awards, Prizes, & Scoring

  • Dynamic Scoring: Point systems are customized and announced in the specific Event Rulebook.
  • Championship Prizes: Physical or monetary prizes will be outlined prior to season starts.
  • Trophy Eligibility: Drivers must complete a minimum percentage of the season to win prizes.
  • Fair Play Clause: Prizes can be withheld if a driver violates iRacing Sporting Code, League or Event Rulebooks.