Quick Question

This is a complex topic.

Depending on the type of simulation (implicit or explicit for example) lower or higher simulation frequencies may be needed for things to be stable. In general implicit simulation is extremely stable even at lower simulation frequencies but it also is unrealistically overdamped. Simulation fidelity is top priority in BeamNG, so we preferred explicit simulation methods as they don't have the overdamping problem (they can also preserve energy in a closed system). The disadvantage of explicit simulation methods is that they are a lot less stable than implicit methoods, and so for explicit to become stable it needs a lot higher simulation frequencies.

2khz is needed because if you try to simulate metal materials with an explicit simulation method at lower than 2khz frequencies, things become unstable and they blow up.