Le Mans Ultimate is staging one of its most demanding multiplayer tests yet on September 25, 2026, with a 12-hour team race at Le Mans featuring a maximum grid of 62 cars. Hypercar, WEC LMP2 and LMGT3 machinery are taking part in the test, which forms part of Studio 397’s ongoing work on network stability ahead of a full 24 Hours of Le Mans team event planned for October.
The 12-hour test was scheduled to begin at 08:00 UTC on September 25 and uses the same three-class structure planned for the upcoming 24-hour event. With as many as 62 cars sharing the Circuit de la Sarthe and multiple drivers swapping in and out over a long endurance race, it represents a significantly heavier test of Le Mans Ultimate’s online infrastructure than a conventional daily or special event.
Studio 397 is treating the race primarily as a public network test rather than simply another endurance competition. The developer wants to collect real-world data while monitoring its servers and deploying changes to the game’s networking systems, using participation from the community to expose problems that are difficult to reproduce at the same scale internally.
A Major Test for Le Mans Ultimate’s Multiplayer Infrastructure
The timing is particularly important because Le Mans Ultimate has been undergoing substantial changes to its online technology since the release of Version 1.4. That update moved game-to-game connections from TCP to Reliable UDP, or RUDP, as part of a broader effort to improve connectivity and reduce disconnections during online racing.
The initial rollout did not go entirely as planned. Studio 397 acknowledged reports of unusual netcode behaviour, including so-called phantom collisions, and subsequently reversed some of the networking changes while continuing to refine the RUDP implementation. The developer has maintained that RUDP remains part of its long-term strategy but needs additional tuning before the transition can be considered complete.
That led to the creation of a series of public open beta network tests during September. Rather than relying exclusively on smaller internal sessions, Studio 397 has been using scheduled endurance races to generate realistic loads involving large grids, driver swaps, changing conditions and extended server uptime.
62 Cars Across Hypercar, LMP2 and LMGT3
The September 25 test is the largest of the latest programme at Le Mans. The race supports up to 62 cars divided between Hypercar, WEC LMP2 and LMGT3, creating the same basic multiclass combination that will be used for the full 24-hour race.
Large multiclass fields create several challenges beyond simply keeping 62 players connected. Le Mans Ultimate also has to manage driver swaps, team registration, timing, RaceControl data, live race information, pit stops and connections changing throughout the event as different drivers take control of each car.
The length of the test is equally important. Problems that may never appear during a 30-minute race can become much more visible after several hours of continuous operation, particularly when drivers disconnect, reconnect and perform multiple swaps. A 12-hour event therefore gives Studio 397 a much closer approximation of the conditions it will face during the planned 24-hour race.
Recent Updates Continue to Target Online Stability
The test also comes shortly after another round of fixes in the Version 1.4.2 branch. Studio 397 has continued addressing RaceControl, online championships, team events and hosted servers while making further changes intended to improve the overall reliability of multiplayer competition.
A subsequent hotfix specifically addressed long synchronization times when loading into team-based events. That type of issue becomes particularly relevant when preparing for races involving dozens of teams and potentially several drivers assigned to each entry.
Studio 397 has made clear that the September tests are designed to complement those software updates. The objective is not simply to confirm whether an individual fix works, but to observe how the complete online system behaves under sustained real-world load before moving on to an even larger endurance event.
Full 24 Hours of Le Mans Planned for October
The current Le Mans Ultimate Special Events calendar places the full 24 Hours of Le Mans during the week beginning October 20, 2026. Like today’s 12-hour test, the event is scheduled to use Hypercar, WEC LMP2 and LMGT3 machinery.
That gives Studio 397 only a few weeks to evaluate the results of its current test programme and make any necessary adjustments. The calendar also includes additional team races between now and then, including the 6 Hours of Fuji and a 10-hour Road Atlanta event, providing further opportunities to evaluate endurance racing infrastructure under different conditions.
The October event is particularly significant because a successful 24-hour multiplayer race requires more than raw server capacity. Stability during driver swaps, reconnections and long sessions is essential for teams committing an entire day to a single event, meaning reliability becomes just as important as the simulation itself.
Today’s Test Is About More Than Finishing 12 Hours
There may be race winners when the 12-hour session ends, but the more important result for Le Mans Ultimate will be the technical data collected behind the scenes. Studio 397 has specifically asked for strong participation in these tests because higher player counts allow the team to reproduce realistic conditions and identify issues faster.
The developer has also warned that live testing remains fluid. Changes can be deployed rapidly and future test schedules may move depending on what is discovered, so the October 24-hour event should still be viewed within the context of an active development and validation programme.
For Le Mans Ultimate, today’s 62-car race is therefore an important rehearsal. Twelve hours around the Circuit de la Sarthe should provide Studio 397 with one of its clearest tests yet of whether the game’s evolving online infrastructure is ready to support the much more demanding 24-hour event planned for the week of October 20.
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