Hi,
As far as I understand it, the Solver Iterations affect the precision of the connections (if any) in a Physics context. The accuracy of contact (collisions) is improved by increasing the number of ‘Steps per second’.
I usually use 300 for ‘Steps per seconds’ (and 150 for ‘Solver Iterations’). Of course the more steps and/or iterations the longer it takes. I am still considering whether to take these values as default.
When you’ve tried 500 then presumably something else is bugging your model. Can you please post it?
Luc