I think I found the answer a few days ago. Check out this thread:
https://www.gtplanet.net/forum/thre...el-lock-setting-in-game.361940/#post-12020696
It appears that GT Sport defaults to 900 degree on every car
even if you manually adjust it on the wheel itself. There is an exception to this, but it's extremely limiting (discussed in the thread above). No soft-lock
and no way to manually adjust DoR is absolutely ridiculous in my opinion. I bought a T150 this weekend as a test (won't keep it though, and have since bought a CSL Elite) and can confirm the behavior described in that thread. But it sure does appear to me that every single car has 900 DoR of rotation and there's very little that you can easily do. What's still not clear to me though is if that is intended behavior or a bug.
I'll say this though, I tried Project CARS 2 with the wheel this weekend as well and it was absolutely
glorious. Implements true soft-lock between cars and the FFB is so much more responsive, even with virtually no tweaking. There's tons of great FFB info out there for just about every wheel which will make it even better. Don't get me wrong, I still love GT Sport, but it may be relegated to just a controller for me.