Quote: Usually it has nothing to do with bump steer.When the suspension is unloaded under acceleration the movement of the suspension in relation to the fixed point of the steering componants can effect the position of the wheels.Look to the Ackermen geometry of your suspension/steering relationship for your issue.
Ackermann has little-to-nothing to do with the tires steering in heave or roll suspension movement. It is completely dependent on steering input and the knuckles turning relative to one-another.
If toe is changing during heave suspension cycling/unloading, it's bump steer.
If camber is changing, it is the built-in camber change in heave of the suspension.
It wouldn't be unlikely for it to be a combination of the two with given steering/suspension tolerances of these cars.
If the fixed steering componants (pitman arms,idler arms or rack) are too far forward or behind the attaching points at the wheel they will effect outward and inward movement of the tires.Cross travel like up and down travel must opperate in the same or similar plane.
