So I bought the game and 2 races in I was getting this horrible flickering while driving.
it made the game unplayable for me.

I went digging and found a fix so here's what to do.

Download dgVoodoo2

https://dege.freeweb.hu/dgVoodoo2/dgVoodoo2/

Get the latest stable release and download it

This is the official source of this program.

Once downloaded, open it and you will see a file called dgvoodooCpl.exe.
Windows will tell you this is a malicious file. It's just a false positive, not an actual virus.

dgVoodoo2 works by injecting itself into DirectX calls.
That behavior looks exactly like what malware or cheat engines do — hooking into another process.
Because of this, some antivirus engines especially Windows don’t analyze it deeply and just mark it as "malicious files"

It's safe, i've had no issues at all.

I recommend just creating an exclusion in Windows Security for your Ridge Racer Unbound folder before copying dgvoodooCpl.exe into it.

Once that's done, you will see a folder called MS, open it. Then open x86 and copy the files into your game folder.

Now run dgvoodooCpl.exe from your Ridge Racer folder.
Again, it's gonna say it's a virus, just run it anyways.

Here's the settings you want:

In the General tab:
Set “Output API” to Direct3D 11 (feature level 10.1) or Direct3D 12 (I used 10.1 but test both if one glitches).

In the DirectX tab:

VRAM: 1024 MB or higher (I used 1024)

Force vSync: On

Resolution: “Unforced” (so the game decides)

Hit Apply.
It’ll create/update dgVoodoo.conf in the same folder.

And that should be it!

Keep in mind, before I found this fix I also locked the FPS to 60 in Nvidia Control Panel so that may also help i'm not sure but my game runs perfectly fine now!

I hope this helps you all because that flickering was driving me insane!

Peace!