So I’ve been trying to come up with a theory that fits the symptom that a fraction of folks, not me personally, are experiencing with the new springs. So how about this theory?:
The old rear springs didn’t allow much travel before becoming coilbound. Therefore the rear sway didn’t play much because you’ve gotta have wheel travel for torque to get put on the sway.
With the new springs, the rear has much more freedom to compress, and the new springs aren’t that much stiffer than the old, call it 14%, IIRC. Therefore more rear wheel travel is certainly possible with the new springs. More rear travel would mean more torque on the rear sway which would remove rear traction and cause oversteer.
That doesn’t explain why this is an issue for only “some” cars. Heck, near as I can tell, there’s as many cars that have reacted to the new springs by creating oversteer. So clearly our cars are not as similar as some (me included) imagined.
But at least we now have suspension. As opposed to bound up springs in the rear, and riding the bumpstops all the way thru the turn in the front. You fast guys were able to use your magic to cope with that, but the rest of us struggled.
So, you buy this theory? Some are experiencing oversteer now because the additional available rear wheel travel is causing rear sways to work harder than before?