If you are running a 120hz or 144hz monitor and you want to run rocket league above 60fps, this guide is for you.
To unlock your FPS in rocket league, first go to:
Step 1: Locate the following folder: \Documents\My Games\Rocket League\TAGame\Config\
Step 2: Open the TASystemSettings.ini file with your text editor.
Step 3. Find this line: AllowPerFrameSleep=True. Change it to AllowPerFrameSleep=False.
Step 4: Save your file. (You may have to make it read only so the game doesn't try to revert it)
Enjoy the buttery-ness.