Bump Steer, How to tell...? Options

[jim_hoyland]

Is the test for bump steer driving over a speed bump straight on or at an angle. I don't get any noticable pulling when taking the speed bump straight on. Just want to get the test situation straight, any input will be appreciated.

Car is lowered about 50%

[orange914]

i really don't have real world experiance with modifing the 914 geometry like many of our a/x racers here. but much of long arm/short arm theory applies.

from the pictures the lower arm being level creates a good swing ark. as long as the tie rod is parallel to it, via bumpsteer kit. the theory is if the two move up and down parallel to each other there won't be "bump steer" or one pull more than the other. there are many factors that will effect this though, like unequal lengths. a cool study of this is how carrol shelby relocated the mustang upper arm 1.5" lower. this only changed the upper arm angle from downward angle to level. it also altered the ride height, altered the charicterists of the camber swing. ever see the inner wheel on a turn change to negative camber as it lifted on an old mustang before the mod.?