Some older force feedback drivers cannot handle rFactor2's high-fidelity update rate and in fact make the simulation fall out-of-realtime (you'll notice if things get jerky and slow and the purple bar on the CPU Time graph goes to 100%).
There are two possible fixes:
1) get updated drivers from your hardware manufacturer (recommended).
2) open up controller.ini and set "Skip Updates" to a non-zero value. Note that the presets for new Thrustmaster wheels include the second fix in case users haven't updated their drivers. Again, we recommend updating the drivers and setting "Skip Updates" back to 0.