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Le Mans Ultimate reverses netcode changes in response to critical feedback

Following widespread reports of unnatural car behaviour during online races, Le Mans Ultimate’s latest hotfix reverses the network protocol back to where it was originally.

Le Mans Ultimate reverses netcode changes in response to critical feedback

3 minute read

By Thomas Harrison-Lord

Le Mans Ultimate’s Version 1.4.1.3 hotfix, released today (19th August 2026), reverses some of the contentious changes to the title’s netcode system in response to widespread criticism.

Testing of the new system will continue during dedicated races, in the hope of refining it to the point where it could become the new default.

‘Netcode’, sim racing parlance for how a game reacts to proximity and car-to-car contact during online multiplayer, has long been a strong suit of Le Mans Ultimate, compared to its direct rivals.

However, at the end of July in a Version 1.4 update, the systems used were swapped from  Transmission Control Protocol (TCP) to “reliable UDP”. In theory, this was to avoid delays typically seen with TCP and, according to publisher Motorsport Games, “should be better suited to wheel-to-wheel racing and help us resolve some longer-term issues we’ve been experiencing.”

That, ultimately, hasn’t been the case, with sporadic car oscillations and bizarre phantom contacts reported by the community.

As of yesterday, at least two high-tier competitions that use Le Mans Ultimate paused their championships while the Studio 397 development team worked to fix issues (one of which is to do with brake cooling, and not netcode).

It has been confirmed that the game will now “revert some changes to the network protocol for the game [back] to the previous versions found since launch.”

“To clear up some confusion on the technical side, much of the game traffic is sent identically to before 1.4 [using TCP]. However, there does appear to be some interference in some situations with our latest change,” said Motorsport Games.

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RUDP test races

While the launch has not gone as expected, Motorsport Games states that it will continue to work on RUDP for its netcode systems through a series of test events.

“We’ve designed a way to allow us to hold RUDP testing sessions directly in the public version of the game you have whilst allowing other servers to use the tried and tested protocols we’ve been using until now,” it stated.

“There is no technical reason the “RUDP” changes can’t succeed, but it clearly needs more time to mature.”

One has to wonder, with netcode being such a strong point in Le Mans Ultimate’s repertoire, why the rollout wasn’t conducted this way originally.

However, the test sessions for RUDP and reverting back to the prior methods are quick and considerate steps based on the sim racing community’s feedback. Now, let’s get back to trying to grind our way out of bronze…

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Discussion

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  1. Just wondering what you guys mean when you say «grind your way out of Bronze» It took me 8 Daily Races, starting as a Rookie, to reach Silver in both DR and SR. What’s so difficult about that?

    Reply
    1. We bow to your superior skills, bravo.

      But all jokes aside, it would appear most players are in the bronze tier.

      Reply
      1. Fair enough, but I’m genuinely a little confused. I didn’t really do anything differently or specifically aim for Silver, so I’m surprised when I hear that many people struggle to get out of Bronze. I did all those races in LMP3, though, so maybe the competition is tougher in GT3 and it’s harder to get out of Bronze there. I honestly don’t know.

        Reply

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