I'm analysing some dynamic models using Ansys LS-DYNA explicit dynamic models.
My model only has beam elements (BEAM161), concentrated masses (MASS166) and springs/dampers (COMBI165).
The problem is that the length of the springs/dampers is affecting the results, which shouldn't happen: according to the manual, you define COMBI165's stiffness or damping coefficient, which is multiplied by the relative displacement/velocity between the nodes to obtain the reaction force.
For my particular problem, the length of the spring/damper is not conditioning the time-step, so that is not the source of the difference.