Re: Bump Steer Question?
[Re: moparAL]
#2683442
08/01/19 01:52 PM
08/01/19 01:52 PM
|
Joined: Dec 2003
Posts: 22,695 Bitopia
jcc
If you can't dazzle em with diamonds..
|
If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,695
Bitopia
|
I am uncertain that bump steer causes any significant "problems" grip wise, other then the car wants to take a different path while the suspension vertically cycles thru a bump. as a driver that is always undesired/ a pain/distraction, etc, but not sure its a real issue at anything say below 7/10ths driving. Likely a subjective quality at modest levels.The normal corrective action/remedies changing the height relationship between the inner LCA pivot/outer lower ball joint, as it relates to the the inner and outer tie rod assembly. The change is normally is made by n adjusting the height of the outer TIE rod. It is doable, just not sure how close to perfect one needs to achieve (and perfect is not achievable in most cases). Bump steeri s effectively a toe change thru vertical travel of the suspension
Last edited by jcc; 08/01/19 01:54 PM.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
|
|
|
Re: Bump Steer Question?
[Re: TC@HP2]
#2707021
10/15/19 02:18 PM
10/15/19 02:18 PM
|
Joined: Mar 2005
Posts: 403 Colorado front range
BcudaChris
mopar
|
mopar
Joined: Mar 2005
Posts: 403
Colorado front range
|
Basically, as the suspension goes up and down, the tires will toe in and out to varying degrees.
While bump steer gets a lot of bad press, most drivers aren't capable of really noticing it unless the set up is really, really bad. If you know any Brand X folks that have lowered the front of a Fox car more than a half inch or so with shorter springs, and not either lowered the rack with offset bushings, or used tie rod ends with extended knuckle studs, ask to drive their car aggressively. You'll be treated to a setup described by Tony.
|
|
|
Re: Bump Steer Question?
[Re: BcudaChris]
#2709093
10/22/19 08:40 AM
10/22/19 08:40 AM
|
Joined: Mar 2005
Posts: 1,545 Seattle, WA
375inStroke
Special needs person
|
Special needs person
Joined: Mar 2005
Posts: 1,545
Seattle, WA
|
If you know any Brand X folks that have lowered the front of a Fox car more than a half inch or so with shorter springs, and not either lowered the rack with offset bushings, or used tie rod ends with extended knuckle studs, ask to drive their car aggressively. You'll be treated to a setup described by Tony.
I have a road course Fox Mustang. Yes, it sux. Before I sorted it out, it was so bad that I couldn't really brake with the steering wheel turned. It would pull into the turn hard, then back out when released, and that's without the steering wheel pulling one way or the other, just bump steer turning the wheels. It had the offset rack bushings, too. When I measured the bump steer, it was 1/4" per tire, per inch of travel, so if the wheel moved up one inch, it toed out a quarter inch, per side. If you slammed on the brakes, and the nose dove an inch, that's a half inch of toe out. It it's rolling, one wheel's turning in, the other out. The readily available bump steer kits fixed it. For our cars, shimming the steering box to move the pitman arm up or down fixes the left side, and slotting the idler arm so you can tilt it up or down does the right. You put a washer over the slot on the K-frame, then weld it in place where it needs to be to lock it in.
|
|
|
Re: Bump Steer Question?
[Re: 375inStroke]
#2709207
10/22/19 02:16 PM
10/22/19 02:16 PM
|
Joined: Dec 2003
Posts: 22,695 Bitopia
jcc
If you can't dazzle em with diamonds..
|
If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,695
Bitopia
|
I always felt for the daily driver to experience bump steer was fairly easy. When at interstate speed, when on a curve entering or exiting the highway, if you encounter a pavement elevation change across the entire lane, like going from asphalt to a concrete bridge, if the car, with no steering inputs, wants to move a 1/2? lane over, and then after it settles down wants to move back, you got the proverbial "bump steer" example.
This is different then "skating'" across railroad tracks in that it wants to go back
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
|
|
|
|
|