I struggled with the offroad Speed Zones using the Ariel Nomad (and the Aggera was too bouncy). I found that making my own Lambo Huracan Rally car by basically upgrading to a V12, twin turbo, adding all engine upgrades, weight reduction, etc but then using Rally tires and Rally suspension. No tuning required, just strapping on parts. I found the rally Huracan to be faster and more stable than the Nomad, and less bouncy than the Aggera