i know its hard to follow but if you set your controller settings to these and when changing car types change to the preference settings listed below it will make every car drivable and very controllable if you need more turning try to adjust the Speed Sensitivity that seems to be the key. hope this helps. also i have printed this list of and have put it in the back sleeve of the game box for quick reference. so i have made it printer friendly just copy and paste whats below and hit print.
Project Cars Controller Settings
Note: All Dead Zones Remain the same when changing cars
Key
Preference:- second number (if two given)
Alternative:- first number (if two given)
Normal Cars (Road/Race/GT/LMP1+2/Touring/NASCAR)
Steering Sensitivity: 30
Throttle Sensitivity: 0
Brake Sensitivity: 30
Speed Sensitivity: 75-80
Open-Wheel Cars (All Formula Cars/Old F1)
Steering Sensitivity: 30
Throttle Sensitivity: 0
Brake Sensitivity: 30
Speed Sensitivity: 65-70
Go Karts (Kart One/Super Kart)
Steering Sensitivity: 40
Throttle Sensitivity: 0
Brake Sensitivity: 30
Speed Sensitivity: 35-40
All other Settings And Deadzones (Do Not Change)
Steering Deadzone: 60
Throttle Deadzone: 20
Brake Deadzone: 20
Clutch Deadzone: 20
Clutch Sensitivity: 40
Controller Filtering Sensitivity: 15
Damper Saturation: Locked
Force Feedback: 0
RPM/Gear Display: On
Controller Input Mode: 3
Advanced: On
Soft Steering Dampening: On
Visual Wheel Filtering: On
Opposite Lock Help: Off