Bump Steer
Question whether it is really "bump steer" (direction changes
with suspension travel) or just more instability (direction
changes on its own, perturbed by a bump impulse). The
latter is sort of charactierstic of the F-body to begin with,
called "tramlining" or "groove walking" and can get worse
with alignment (lowering). More caster will improve it a fair
bit, I am lowered and after a performance alignment it was
more stable than stock.
with suspension travel) or just more instability (direction
changes on its own, perturbed by a bump impulse). The
latter is sort of charactierstic of the F-body to begin with,
called "tramlining" or "groove walking" and can get worse
with alignment (lowering). More caster will improve it a fair
bit, I am lowered and after a performance alignment it was
more stable than stock.
Originally Posted by JohnFrazee02SS
Since I got my car lowered it has terrible bump steer on the freeway. would changing the swayabr links and bushings help? if not what would? 
What you're experiencing isn't actually bumpsteer...it's a bad allignment or worn parts. In order to see what bumpsteer really is, you need to remove the spring from one side, re-assemble it (without the swaybar attached either) and put a jack under the suspension. Let it go to full droop and measure how far that spindle is toed in or out. Now move it up to full compression and measure how far it is toed in or out...also take note of how much up/down travel you measured. Your total bumpsteer is then the change in toe divided by the change in height (some people measure it in angles, some measure it in inches...depends how you're comfortable measuring it I guess). This overall sweep of motion won't change when you lower a car...but you may wind up in a more extreme part of the range (it is most likely not linear). Either way, what you're experiencing is not a bumpsteer issue, and 99.9999% of what you're feeling will be dialed out with a proper allignment and replacing all of your worn front end parts.
I agree that you don't have an actual bumpsteer issue. I don't in my car, and it's lowered. You have a problem with bumps and the car not being stable. Of course the front alignment and suspension parts need to be good and not falling out of the car. I suspect that's not the issue either, as I'd hope you got it re-aligned. I'm sure, as it normal, is that you are feeling the complete lack of control that insufficient damping (read: poor shocks) gives.
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www.stranoparts.com --814-849-3450
Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
10 SCCA Solo National Championships, 2008 Driver of they Year, 2012 Driver of Eminence
13 SCCA Pro Solo Nationals Championships
2023 UMI King of the Mountain Champion
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