Forza Horizon 4 has a bad reputation when it comes to force feedback wheel support, so much so that most people recommend just playing it with a controller. While there is no doubt that the game is primarily intended to be played with a controller, it actually works very well with the Logitech G29 or G920.
The default settings, in fact, are really quite good. Unlike most games, the wheel isn't too heavy and entirely drivable. They can be improved, though. The bigger issue is the steering rotation angle. There is no way to set this on a per-car basis, so you will probably want to pick a setting that works pretty well for all cars, even if it's not accurate.
The game is obviously not a simulation like Assetto Corsa and so you have to manage your expectations accordingly. It feels different to play an arcade racer with a wheel than it does a simulator, and I have a feeling this is where much of the criticism comes from. If you primarily play simulation-style games, you will have get used to the physics, but once you do, there is a ton of fun to be had.
It's difficult to find the single best settings for every situation since there are so many different cars and types of races in the game. The settings I like give plenty of road surface feel without the wheel being too heavy.
G HUB Settings
Unfortunately, you can't create a profile in G HUB for the Windows Store version of Forza Horizon 4. (It may work with the Steam version, though.) You will have to modify the Desktop Profile instead. I've set this to 540° as it is an overall good setting for most cars in the game.
It is possible to use the Steering Sensitivity setting in-game to limit the wheel rotation, but there is no Soft Lock feature, meaning you can keep turning the wheel past the point you are able to in the actual car. Setting the angle in G HUB corrects this problem and is the recommended way to change the steering angle. It's important to note that neither the in-game steering wheel nor tires show the actual steering angle used by the physics engine.
Forza Horizon 4 Settings
In Settings > Control Settings > Wheel > Advanced:
|Steering Axis Deadzone Inside||0|
|Steering Axis Deadzone Outside||100|
|Force Feedback Scale||55|
|Center Spring Scale||40|
|Wheel Damper Scale||50|
|Force Feedback Understeer||25|
|Force Feedback Minimum Force||50|
Vibration Scale controls the vibration you feel when you lose traction. It's quite light as-is, but if you don't like the vibration, you can turn it off completely.
Force Feedback Scale is actually the Aligning Torque setting, the predominant force you feel in the wheel, not the overall strength of the force feedback. Setting this too high will make the wheel quite jerky, especially on dirt roads.
Center Spring Scale is the force pulling the wheel back to the center.
Wheel Damper Scale adds weight to the wheel.
Force Feedback Understeer controls how light the wheel gets when you enter understeer. It's recommended by the developers to not change this value.
Force Feedback Minimum Force is actually the Pneumatic Trail Align Torque setting. Raising this adds strength to the forces at the center point of the wheel, which is much needed on these wheels.
In Settings > Difficulty Settings:
Coming from more simulator-style games, I found it really helped to turn off Traction and Stability control to get the cars to feel more responsive. Be aware, however, that it may not be right for all cars and all types of races, especially Stability Control.
I heard such bad things about this game's wheel support that I largely overlooked it. Once I actually sat down and tried it for myself, however, I found that those issues either have been fixed or only affect certain types of wheels. Whatever the case, the game is a lot of fun and I highly recommend taking it for a spin.
Let me know if you have any questions or comments.