[petevb]

Originally Posted by Bill Verburg

Me too, all I can add is that since I put the solid mounts on my993 to lock out the sliding links the handling has been transformed immensely to the good

So that suggests to me that roll center height is likely the big difference between a set-up 911 vs a set-up 993.
The 911 trailing arm suspension with raised pickups, the inner pickup roughly 20 mm higher than the outer, heim joints instead of rubber, coil-overs, stiffer chassis, wider track, etc looks like it would move very similarly to the race set-up 993 suspension. But I've never experienced an early 911 with the rear-end stability of a GT3 (I've never driven a race moded 993, so I can only imagine it's similar).
One conclusion is that the difference is in the one big variable we're not plotting vs the 993, namely the roll center height...

For those that don't know what I'm talking about, corner entry speed in a 996/ GT3 blows away the average early car- there is absolutely no comparison. Somewhere in these graphs/ variables is the reason why...