The cheats were made by myself and will only work on the American version of the game.
Emulator: PCSX-Reloaded
Recording tool: ShareX
Comments: https://photos.app.goo.gl/L4y5Lo4xgd4qCDZV8
Cheats' memory addresses and values:
Acceleration tuning: 8008CF78 7FFF
Speed tuning: 8008CF7A 7FFF
Handling tuning: 8008CF7C 7FFF
Brake bias tuning (for turbo): 8008CF7E 7FFF