So I put the car up in the air, unbolted the coil over, and proceeded to raise and lower the wheel. I did this to confirm bump steer. The bump steer was epic.
Here is a video for your viewing pleasure(?) <<<Evidently I can't attach a .mp4 movie to this post, can anyone help me with this?>>>
In the video you can see the wheel undergo several degrees of steering angle change as it passes through a couple of inches of suspension travel. The range of motion shown here is representative (ish) of the usual ride height of the car. The effect is worse when the suspension drops further into droop travel or bounces further into bump travel. In droop travel the geometry exhibits severe toe out while in bump travel it exhibits toe in.
Many of use M3W folks have noticed the weird way that the car seems to turn into turns more than you would expect. You turn in and hold the wheel steady and the car turns in, then it sort of turns in again. This is because right after turn in the car rolls into the turn. This roll involves the inside suspension going into droop travel (toe out). This means that the inside tire ends up turning into the turn even more as the car rolls. The exact opposite happens on the outside of the car, where the suspension goes into bump travel and exhibits toe in.
I'm working on replacing the Morgan control arms and uprights with generic racing tubular control arms from Summit racing or some other supplier. I think I can fix the whole problem.
