I don't really know much about the ps4 and what you can and can not do, but for PC.
Go to - \Steam\steamapps\common\DiRT Rally 2.0\input\devices
Open in notepad.
Find -
<device id="{B677044F-0000-0000-0000-504944564944}" name="tm_t150" priority="100" type="wheel" />
Change to -
<device id="{B677044F-0000-0000-0000-504944564944}" name="tm_t150" priority="100" type="wheel" ffb_force="1.0" />
In-game, in the R5's I use something between 105 and 110 steering torque. 70 tyre friction and 130 suspensions. Turn self-centring off, also turn off wheel friction, set collision 20.
In-TM control panel, set overall force to 75%, all the rest to 100%, let the game do centring. I set the wheel to 540, and in-game turn off soft lock.
