Why is compliance so important?

[Caito]

I'm constantly hearing/reading about the importance of compliance. Mostly suspension wise, the camber/toe variations due to compliance are demons that will kill your handling.

Why do such tiny variations generate (as said) such a huge loss in handling performance? If the variations of the suspension are bigger than those of compliance, how can it be that 0.05° of camber change affects so much?

Let me add a non-related question, since I don't want to open another thread just for that. Why is it that track-width change with suspension movement is so important and must be kept to a minimum? How does it affect the wheel (or the car) a track change of 0.01''?


bye bye!

Caito.-

[Jersey Tom]

Who says its only 0.05°?

Hint: Can be a hell of a lot more, even on pro-series cars. That, is why it's an issue (with regard to camber and toe compliance).

Likewise, who says track width (mechanical or pneumatic) changes are only 0.01"?

[Belatti]

Why is it that track-width change with suspension movement is so important and must be kept to a minimum? How does it affect the wheel (or the car) a track change of 0.01''?

Mechanical track change is called scrub and its a thing that if I was a suspension designer I would minimize as much as I can. In steady state cornering, scrub messes with the tyre contact patch, in the way you will have lateral loads variations. Ask Canapino about the time he was in Germany designing an F3 suspension and it was rejected because mechanical scrub was too big

Regarding toe changes, have in mind bump steer can chage it much more than those 0.05° you mention. BTW, where did you take that value from?