guys, we all should vote for this issue: Unreal Engine Issues and Bug Tracker (UE-38710) to let Epic know how important this is for us.
Epic as already delayed the fix from 1.14.1 to 1.15 and given the vehicles and physics history of the engine this issue is more likely to get forgotten than fixed if not voted. It’s a real shame an engine like ue4 to have that embarrasing bug shown here 4.14 Worst physics - World Creation - Unreal Engine Forums. we must not let this pass.