Effect of washers under steering ballstuds?

[CrazyCano]

Hi,

Anyone have an insight into the effect of running washers under the ballstuds on the steering bellcranks/spindles. I understand it effects the bumpsteer, but what exactly does this mean?

Thanks
Alex

[Doomanic]

Bumpsteer is the amount of change in the angle of the wheel relative to the chassis centerline as the suspension moves through its travel.
In a car with no bumpsteer, the amount of toe-in does not change regardless of the position of the suspension.

[Doughty]

the washers are mainly used to get the same bump steer when you change things.

for example, if you change from 30* caster blocks to 25* blocks, you put a gold washer under the hub ball stud. this leaves the ball in the same place as it would have been wigth the 30* blocks

[richard_cree]

just to add to this, toe-out bump steer makes the car safer in bumpy fast corners but costs steering a bit. Typically just try and run no bump steer, or if you have to try and make it mild toe out bump steer.