This is a physics modification to the Steam GTR1 game V.18.104.22.168.
It has new Driver files, Vehicle Physics, and Terrain parameters all in seperate folders. There is a ReadMe file included that explains -in detail- what the mod is about and why it's been created. The idea is to improve the game to be 'AI competative'.
It does not follow the original race results of the 2003 season which the GTR1 game was made for, so the AI are free to race without being constrained to 'meet' the 2003 race results. It does however make for close competative racing against a good AI - you'll probably never know who will win, and it sometimes isn't the fastest cars. Many areas have been improved and this work is based off of the 'GTR2 Reborn Mod' which was produced for GTR2.
The 'Gamedata' folder and 'UserData' folders need to be put into the main GTR folder allowing to overwrite everything.
Inside the 'UserData' folder is a folder called 'IRG'. This contains a file that you need parts of to cut/paste into your own 'name' folder. The included ReadMe file explains the critical lines to copy.