Can I set up a race weekend with qualifying and a race?

Not currently. Your server runs in Practice mode on ZapX. Keep SelectedSessionTypeValue set to GameModeType_PRACTICE; another mode may prevent the server from starting.

What happens if `server_launcher.json` is invalid?

If the file is empty or isn't valid JSON when the server starts, the server recreates it with the default values. Your track and car selections will be lost. Download a copy before making major changes.

Assetto Corsa Evo: Server Configuration

Q: Where do I set the track in Assetto Corsa Evo?

In the Event section of server_launcher.json, set the SelectedTrackValue field—for example, Monza|GP|GP Time Attack|5793. Copy the value exactly as shown in the track list in the guide.

Q: How do I remove cars from my server?

In server_launcher.json, under Event > Cars, set IsSelected and is_selected to false for the car you want to remove. Don't delete the entry itself.

Learn how to set the track, cars, weather, time, and session duration for your Assetto Corsa Evo game server in server_launcher.json → Learn more

10 November 20265 min read0 Views0 helpful

Introduction

With the right configuration, you can turn your Assetto Corsa Evo game server into exactly the racing experience you have in mind: your own name, password, track, car selection, weather, and session duration. In this guide, we'll show you which settings are available, where to find them in ZapX, and what to keep in mind when editing them.

How the configuration works

Your server reads all settings from the server_launcher.json file in your server's main directory. You can open the file in the Configuration tab by selecting Edit directly, or in the Files tab. The first time it starts, ZapX creates the file with sensible default values: practice at Brands Hatch GP, all cars enabled, and clear weather.

Some values don't need to be changed in the file. You can find them in the Configuration tab under Startup parameters:

Startup parameter	Meaning
Server name	Your server's name in the server browser. Default: `ZapX Assetto Corsa Evo Server`
Server password	Password required to join. Leave blank for a public server.
Admin password	Password for you as the server operator. Generated automatically when the server is created.

Every time it starts, ZapX writes these values, as well as the ports and the number of slots you've purchased, to the Server section of server_launcher.json. Everything else, such as the track and cars, stays as you configured it in the file.

Important

Never change the server name, passwords, ports, or player count directly in the file. Your server overwrites the values ServerName, DriverPassword, AdminPassword, TcpPort, UdpPort, HttpPort, and MaxPlayers at every start with the values from ZapX.

After you save, ZapX will prompt you to restart the server. Your changes won't take effect until the server has restarted.

Warning

server_launcher.json must remain valid JSON. If the file is empty or invalid when the server starts—for example, because a comma or bracket is missing—the server recreates it with the default values, and your track and car selections will be lost. Before making major changes, download a copy of the file from the Files tab.

Set the track

The track is defined in the Event section in the SelectedTrackValue field. The value consists of the track, layout, event name, and track length, separated by vertical bars. For example:

json

"SelectedTrackValue": "Monza|GP|GP Time Attack|5793",

Copy the value exactly as shown, including capitalization. The following tracks are currently available:

Code

Brands Hatch|GP|GP Time Attack|3916
Brands Hatch|Indy|Indy Time Attack|1944
Circuit Of The Americas|GP|GP Time Attack|5515
Circuit Of The Americas|National|National Time Attack|3702
Circuit de Spa Francorchamps|GP|GP Time Attack|7004
Donington Park|GP|GP Time Attack|4020
Donington Park|National|National Time Attack|3149
Fuji Speedway|GP|GP Time Attack|4549
Fuji Speedway|GP Short|GP Short Time Attack|4526
Imola|GP|GP Time Attack|4909
Kyalami|GP|GP Time Attack|4522
Laguna Seca|GP|GP Time Attack|3602
Monza|GP|GP Time Attack|5793
Mount Panorama|GP|GP Time Attack|6213
Nurburgring|24h|24h Time Attack|25947
Nurburgring|Gp Strecke|Gp Strecke Time Attack|5148
Nurburgring|Nordschleife|Nordschleife Time Attack|20832
Nurburgring|Sprint|Sprint Time Attack|3629
Nurburgring|Touristenfahrten|Touristenfahrten Time Attack|19300
Oulton Park|International|International Time Attack|4333
Oulton Park|Fosters|Fosters Time Attack|2662
Paul Ricard|Layout 1A-V2|Layout 1A-V2 Time Attack|5770
Paul Ricard|Layout 1C-V2|Layout 1C-V2 Time Attack|5842
Paul Ricard|Layout 3A|Layout 3A Time Attack|3793
Paul Ricard|Layout 3C|Layout 3C Time Attack|3841
Red Bull Ring|GP|GP Time Attack|4318
Red Bull Ring|National|National Time Attack|2336
Road Atlanta|GP|GP Time Attack|4088
Sebring International Raceway|GP|GP Time Attack|5954
Suzuka|GP|GP Time Attack|5807
Suzuka|East|East Time Attack|2243
Suzuka|West|West Time Attack|3466
Watkins Glen International|GP Inner Loop|GP Inner Loop Time Attack|5552
Watkins Glen International|Short Inner Loop|Short Inner Loop Time Attack|3943
Watkins Glen International|GP|GP Time Attack|5435
Watkins Glen International|Short|Short Time Attack|3907

Select cars

The Cars list in the Event section contains all available cars. All cars are enabled by default when the server first starts. Each car has an entry like this:

json

{
  "name": "preset_m2_mech_1",
  "display_name": "BMW M2 Coupe - Standard",
  "IsSelected": true,
  "is_selected": true,
  "Ballast": 0,
  "Restrictor": 0
}

To remove a car from your server, set IsSelected and is_selected to false for that car. You can identify it by its display_name.
Use Ballast (additional weight) and Restrictor (power restriction) to balance individual cars against each other, for example, in a league using Balance of Performance.
Don't delete any entries or change the name value. It's best to leave all other fields as they are.

Session, time, and weather

Your server runs in Practice mode (GameModeType_PRACTICE) on ZapX. Session settings are in the Sessions section under PracticeSession:

Field	Meaning
`Length`	Session duration in seconds. Default: `300` (5 minutes)
`Hour` / `Minute`	Time on the track when the session starts. Default: 4:00 PM
`TimeMultiplier`	How quickly time passes on the track. `1` is real time.
`MaxWaitToBox`	How long inactive (AFK) drivers can remain before being removed from the server
`OvertimeWaitingNextSession`	Wait time before the next session

If IsCycleEnabled in the Server section is set to true (the default), the session automatically starts over when it ends.

Important

Keep SelectedSessionTypeValue in the Event section set to GameModeType_PRACTICE. Race weekends with qualifying and a race are not currently supported on ZapX and may prevent your server from starting.

You can also set the weather and track conditions in the Event section:

Field	Possible values
`SelectedWeatherTypeValue`	`GameModeSelectionWeatherType_CLEAR` (default), `..._SCATTERED_CLOUDS`, `..._BROKEN_CLOUDS`, `..._OVERCAST`, `..._DRIZZLE`, `..._RAIN`, `..._HEAVY_RAIN`
`SelectedWeatherBehaviorValue`	`GameModeSelectionWeatherBehaviour_STATIC` (weather stays the same, default) or `GameModeSelectionWeatherBehaviour_DYNAMIC` (weather changes)
`SelectedInitialGripValue`	`InitialGrip_GREEN` (fresh, slippery track, default), `InitialGrip_FAST`, or `InitialGrip_OPTIMUM`

Always enter the full values, for example GameModeSelectionWeatherType_RAIN. The ... in the table only indicates the shared beginning of the values.

More settings in the Server section

Field	Meaning
`SelectedServerTypeValue`	`MultiplayerServerListSessionType_RANKED` (default) or `MultiplayerServerListSessionType_UNRANKED`
`IsCycleEnabled`	`true` makes the session start over when it ends
`SpectatorPassword`	Password for spectators. This value is not overwritten at startup.

Conclusion

Your Assetto Corsa Evo server is now configured just the way you want it. If something isn't working as expected, see our guide Common issues. If your server won't start after a change, check out our guide Server won't start. If you have any other questions, our support team is available every day! 🙂

FAQ

Frequently asked questions

In the Event section of server_launcher.json, set the SelectedTrackValue field—for example, Monza|GP|GP Time Attack|5793. Copy the value exactly as shown in the track list in the guide.

In server_launcher.json, under Event > Cars, set IsSelected and is_selected to false for the car you want to remove. Don't delete the entry itself.

ZapX writes the server name, passwords, ports, and player count from your startup parameters to the file every time the server starts. Change these settings in the Configuration tab under Startup parameters.

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