Hi guys,
i will race my dc5 on rally-events next season so i try to dig deep in the suspension geo thingy.
Im aware of the Scrubradius. I think thats my first issue. Im running 8,5J with ET-35. I swapped Topmounts for Caster and i grinded the topmount holes more the the inner back. Im at -2,2° Camber at the moment, so with the increased camber i should be changing the SAI as well. Im unsure of how much Scrubradius i have left. I tried to measure it but its close to impossible with a cord and an McPherson Strut. I might just change to a rim with less offset and see how it drives.
Now to the Bumpsteer.
I also was in the believe that manufactors know what they are doing, and fitted Hardrace shperical inverted track rod ends. So I heard alot of negativety about this stuff and i am sure that ive done nothing good with that mod. BUT, i just dont understand why. If the tie rods are at an angle and move on the arc (=circle), the more they are on an angle, the more they move inwards (view from infront)! Hence changing toe, hence producing bumpsteer. If they are flat - or better, slightly leaned down, and the coil compresses, the movement ist mostly traveling up and down, and not inwards, without changing the toe that much.
I asked that in the facebook group but nobody could explain me exactly why it is. As i said. I am certain that its not good from what you heard from very clever people, but i cant get my head around it whys that.
So any help would be appreciated!