If you are hosting a session in F1RST3 u will have the opportunity to select the kind of physics that will be used in that session. This guide will show you how this settings work and how u can adjust them. You have multiple physics options available when hosting, select on Physics Tab

Set 'Set Enforced Physics' = Checked
Set Default Physics = Checked
All Vehicles Equal = Unchecked

Equal Physics for All: You can select one car physics file to be used by all cars

Set 'Set Enforced Physics' = Checked
Set 'Default Physics' Off = Unchecked
'All Vehicles Equal' = Unchecked

Set 'Set Enforced Physics = Unchecked
Set 'Default Physics Off = N/A
All Vehicles Equal = N/A

NOTE:
IF 'Set Enforced Physics' is used, F1RST will create a new physics file in the car folder called F1RST.HDV, this is created based on the settings you have chosen, and uses the original physics from the game. After the game ends, it should be deleted automatically.

Example:

Take GTR

If you select the Standard Options as described above, the client makes F1RST.HDV from the original physics for the car you and the other drivers are using.

If you use One Physics for All as described above, and perhaps you have set the all cars to have the 550 physics, the client makes the F1RST.HDV from the original 550 physics and puts it in the car folder you are using, and whatever car folders the other drivers are using. This is also the same for the Custom Options I described.

If you have selected N0 Cheat Checking Options described above, then no F1RST.HDV file is created, and no other files are touched.