Go to Tuning Shop > Club Sports > Buy Power Restrictor and Ballast (they both cost very little)
Then in Time Trial or Lobby, go to Settings > Car Settings > Detailed Settings
Go to Performance Adjust
Then change the Power restrictor percentage until you hit the right Max Power
Then change Ballast percentage until you hit the right weight
Ballast position can also be changed but for testing I left it at position = 0
I think all Gr4 cars have an ECU equipped by default - You can also change the power by adjusting the ECU percentage (it gives you a slightly different torque curve than by using the power restrictor) - but that's not needed for the sake of this exercise
Last edited: Apr 26, 2022