Before we go any further: you can play Project CARS with a controller, but you really shouldn't.
As already mentioned, this is a game made for steering wheels, and I've already read about controller-related frustration from European PS4 and Xbox One players (who got Project CARS last week, as did PC gamers).
If the thought of having a steering wheel in your living room isn’t one you’d ever entertain, Project CARS probably isn’t the game for you.
I don't have a wheel, not comfortable for couch racing, never needed one either in over 100 racing games.
It's a bit better after setting the deadzone to 0 (default is 15, no need for that with the ds4) There's still a tendency to overshoot even minor corrections due to the input lag. 60 fps is wasted on this game because of that. Maybe lower steering sensitivity will help. Kinda annoying that none of the settings are explained. Default sensitivity is 50, is it linear, does it accelerate, no clue.
The AI is decent, too; there are none of the "pubbie on Red Bull" first corner antics of Forza’s Drivatars, nor the “I’m sticking to this line like I’m a train” automata of GT.
Erm no, passing me on the outside through a sand trap to then re-enter the track and crash into me, I don't call that decent AI.
http://forum.projectcarsgame.com/showthread.php?21864-Dualshock-4-Controller-Settings-Problems-amp-Solutions
9 pages of people suggesting different settings... It seems every car needs its own specific controller settings :/
I switched to console gaming to be rid of this setup bullshit. Car tuning sure, but controller tuning, wtf.
Unfortunately the devs have a long list of bugs to fix before getting to improvingthe controller input. Controller input feels like a placeholder atm.
I tried a few controller settings yet the biggest problem is still the lack of feedback from the tires. You float around the track and suddenly lose traction without warning and no chance to catch or correct it. It really doesn't encourage driving on the edge. At least restarts are fast. Meanwhile the AI happily cuts through grass and gravel invalidating their lap times every lap, except their lap times still count. Don't follow the AI driving line as you'll get an off-track penalty...