Ridetech OUT, 4 link Watts-link in.

[Tweak]

So I thought it was about time to add the body and fix it to the Roll Axis to see if the results differ.
Excuse my crude body model, its about establishing movement. If anyone has a 3d scanned cad model of a 1st gen floor, id be happy to pay for a copy.

When moving the diff this model only had like 0.9mm of Rear Steer, but with the tyres fixed to the ground and the body rolling on the Roll Axis it now has 4.25mm of Rear Steer. Very Interesting.

That's with 2 degrees of body roll.. That's my next question...How much body roll does my car have?

[stab6902]

That's with 2 degrees of body roll.. That's my next question...How much body roll does my car have?

I'd guess 2-3 degrees per g would be in the ballpark. You could do the math with spring rates, sway bar rates, center of gravity location, roll centers, etc, but at the end of the day it's still a calculation that will likely have quite a bit of error. If you really want to know, I think you'd be best off driving in a circle at maximum lateral g's (think skidpad test), have someone take a picture of the back of the vehicle, and then use photo editing software to measure the angle between the vehicle body and the rear axle (hopefully you'll be able to see it under the car). You don't want to measure body angle relative to the ground because then you'd be including tire deflection.