I tend to lower the steering ratio because I like to have a more responsive GT3 when I turn my wheel while putting very little angle.
Don't hesitate to raise the steering ratio by 1-2 clicks if you are used to playing with more steering ratio.

TC: - I recommend the TC2 to be safe and at the exit of the T1 and the Bus Stop
      - TC1 if you are good on the M4
      - TC Off if you master the M4

HotLap/Qualifying lap adjustement:
- Front Target psi tyres at the end of the lap 27,0-27,1  
- Rear Target psi tyres at the end of the lap 27,0-27,1
- Front Toe: increase 1-4 click if you want more stable but understeer appears (it depends on the feeling of player)
- Rear Toe: increase 1-3 clicks if you want more stable OR don't touch
- Front Antiroll Bar: increase 1 click if you want more stable OR don't touch
- Rear Antiroll Bar: decrease 1 click if you want more stable OR don't touch
- Rear Ride Height + Rear Wing: it depends on your choice of wing
   > 70 with 8 wing (69 if you want more stable)
   > 67 with 6 wing (66 if you want more stable)
   > 62 with 5 wing (61 if you want more stable)

Race adjustement (advice): Adjust based on race duration. For 15 minutes, you can keep the qualifying setup. For endurance with a 1h/1h10 stint, opt for a slower setting for pure performance but consistent over the duration of the stint.
- Front Target psi tyres at the end of the lap 27,2-27,4 
- Rear Target psi tyres at the end of the lap 27,2-27,4
- Front Toe: increase 1-4 click if you want more stable but understeer appears (it depends on the feeling of player)
- Rear Toe: increase 1-3 clicks if you want more stable OR don't touch
- Front Antiroll Bar: increase 1 click if you want more stable OR don't touch
- Rear Antiroll Bar: decrease 1 click if you want more stable OR don't touch
- Rear Ride Height + Rear Wing: it depends on your choice of wing
   > 70 with 8 wing (69 if you want more stable)
   > 67 with 6 wing (66 if you want more stable)
   > 62 with 5 wing (61 if you want more stable)
- Front Brake Ducts: it depends on the temperature
- Rear Brake Ducts: it depends on the temperature

My best lap with this setup: 2:15.665 with 62 Rear Ride Height and 5 wing (on a mega lap, there is the possibility of doing 15.4 very high, so you can improve so much my time)
                                                2:15.680 with 70 Rear Ride Height and 8 wing (on a mega lap, there is the possibility of doing 15.5 very high, so you can improve so much my time)

As said in the description, I share my 2 setups. My base with full wing, and my vmax setup.
Good Luck and Have Fun.

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