Hi all, does anyone have any idea how much camber and castor results from a certain amount of adjustment of bottom arm/castor rod length? ie how much to lengthen a bottom arm to achieve -2.5deg camber for example?

I am wanting to get the front geometry right on my sunny for rallying, and am going to make non-adjustable modifications to start with (shortening castor rods and lengthening bottom arms) and want to get it roughly right so I don't have to do it again!

I was thinking it would be possible to work it out, IF I can measure the installed length of the struts, from balljoint to strut top. Will give it a go. But qualified opinions are eagerly sought!