Nohachi's suspension ramblings thread

[NoHachi]

Drako!

Now for the interesting stuff and a bit more background.
The 135mm value is the offset of the hub-face to the ball joint. So at the moment the drawing is correct for ET-0 rims. We can easily change the value to reflect different rims, but I thought most of us have something in the neighbourhood of ET-0. We can easily change the strut length in the future too.

The difficult stuff:
This is why I needed the drawing in the first place: determining the roll centre height.

These are the steps:

copy and mirror the suspension image. The distance between the centres of the topmounts is exactly 1000mm.

Draw a construction line that is tangential to the strut and passes through the upper strut mount.

Draw a construction line that passes through the lower balljoint and the LCA pivot at the chassis.

find the intersection of these two construction lines.

Draw a construction line that passes through the intersection above and the centre of tire contact patch

The roll centre is at the intersection of these two lines. Easy!

A picture for reference:
[img] http://www.roversd1.nl/sd1web/techtalk/m...center.gif [/img]

This site explains it as well:
http://www.roversd1.nl/sd1web/mcpherson.html