Overview
The max speed of ships in Space Engineers can be modified. Please follow this guide to learn how it is done.
Modding guide for ship speed
Modding the ship speed in Space Engineers is quite easy. All you have to do is to create a new folder in the game’s mod directory (the path is: C:Users{YOUR WINDOWS USERNAME}AppDataRoamingSpaceEngineers) (If you have difficulties finding the log file, press WIN+R, in the box that will open paste %APPDATA%SpaceEngineers and press enter.)
You can name this new directory as you want e.g. ShipSpeedMod. Inside this directory, create another new directory called “Data” (this time the directory name must be exactly the same). Then just copy the Enviroment.sbc file into Data directory. You can find the Environment.sbc file in Space Engineers content directory located in your steam library e.g : c:Program Files (x86)SteamSteamAppscommonSpaceEngineersContentData
You can also try to search for the SpaceEngineers folders in your computer.
After you copy the Enviroment.sbc file you can change
<SmallShipMaxSpeed>100</SmallShipMaxSpeed>
<LargeShipMaxSpeed>100</LargeShipMaxSpeed>
value to any different value. As you can see there is separate speed limit for small and large ships. However, you cannot mod astronaut speed. Flying ship of the character is always 5% more than the maximum speed of any ship and walking is 30% more than the maximum ship speed.
Currently the speed can be from 0 (negative values will be set to 0) to half of the speed of light (bigger values will be clamped). It can happen that maximum speed will be a little more than the value set on the file e.g. for 200 value max speed, it can be 210 in game. This is a normal behavior.
Update 01.064 video