BTR70 cannot reach full speed on any surface of my map. After investigation i noticed that when the BTR70.et object is spawned. You can see a ammo can directly beneath the model spawn with it , just low enough that i suspect it can clip with the ground. Its my belief that this is whats causing the problem.
Attached are screens of the BTR in the editor which shows the ammo can
, the spawned vehicle in game that does not have the ammo can visible , and a video of the bug.