The iRacing Britcar 24 Presented by Cosworth is finishing up this weekend at the Silverstone Circuit. The event wraps up September 21, and the 24-hour races from the Saturday timeslots are still running through Sunday. Whether you are watching from the sidelines or still considering a final entry, this guide covers the car classes, team structure, license requirements, and race rules.
iRacing Britcar 24 Schedule and Sessions
The event ran across four timeslots starting Friday evening. Timeslot 1 opened Friday at 10:00 PM GMT (6:00 PM ET). Three Saturday sessions followed: 7:00 AM GMT (3:00 AM ET), noon GMT (8:00 AM ET), and 4:00 PM GMT (noon ET). Each session carries a 24-hour race, so the Saturday afternoon start is still running on Sunday.
Registration for each session opens 60 minutes before the start on the iRacing member site. The Saturday noon GMT session is the broadcasted timeslot, with the top split covered by RaceSpot at iRacing.com/live. If you want to watch the final hours unfold at Silverstone, that is your best option.
GT3 and GT4 Car Classes
The Britcar 24 runs a two-class field with GT3 and GT4 cars sharing the track. Eleven GT3 entries are eligible for the event:
- Acura NSX GT3 EVO 22
- Aston Martin Vantage GT3 EVO
- Audi R8 LMS EVO II GT3
- BMW M4 GT3 EVO
- Chevrolet Corvette Z06 GT3.R
- Ferrari 296 GT3
- Ford Mustang GT3
- Lamborghini Huracan GT3 EVO
- McLaren 720S GT3 EVO
- Mercedes-AMG GT3 2020
- Porsche 911 GT3 R (992)
The Ferrari 296 GT3 is a popular GT3 pick at Silverstone, though any car in the class can run competitively with the right setup work. Six GT4 entries round out the field:
- Aston Martin Vantage GT4
- BMW M4 G82 GT4 Evo
- Ford Mustang GT4
- McLaren 570S GT4
- Mercedes-AMG GT4
- Porsche 718 Cayman GT4 Clubsport
Open setups are enabled across both classes. Teams can tune freely ahead of the qualifying session, so do not skip setup work even if you are starting from a stock base.
Team Format and License Requirements
The Britcar 24 is a team event with a two-driver minimum and a sixteen-driver maximum per roster. Fair share is active, which means every declared driver must complete a lap count proportional to the team total. Plan your full lineup before registration closes, because all drivers must be declared before the session starts.
For the license requirement, a Sports Car license at Class C or higher clears entry. A Class D license also qualifies, provided the driver carries at least a 4.0 Safety Rating. Check your current license tier and SR before attempting to register for the final timeslot.
iRacing Britcar 24 Race Rules and Incident Limits
The iRacing Britcar 24 tracks incidents at the team level rather than by individual driver. At 100 incident points, the team receives a Stop-and-Go penalty. Another penalty follows every 20 points after that threshold. Teams reach disqualification at 250 incident points total.
Dynamic weather is active across the full 24-hour window. Conditions can shift during the night cycle at Silverstone, so factor weather strategy and tire changes into your stint planning. Additionally, clean and consistent driving matters far more than outright pace when the team incident total is climbing.
Final Timeslot
The event wraps up September 21. If you still want to enter, check the iRacing member site for any remaining timeslot openings on Sunday evening. Registration opens 60 minutes before each start, so a late entry is still possible if a slot is available.
The live broadcast is available at iRacing.com/live, with RaceSpot covering the top split. Their call of the final hours at Silverstone is worth watching even if you are not in the race. The multiclass battle between GT3 and GT4 through Sunday makes for a strong finish to the event week.
