Nohachi's suspension ramblings thread

[NoHachi]

Hi Roman,

You're absolutely right about the steering arms and bump steer effect. They don't cause bump steer by them selves, but any bumpsteer already present will be more noticeable.

About roll centre position. If I understand you correctly, your idea is to use struts with a larger inlination angle instead of RCA's to get roll centre back to OEM? Interesting idea, but you end up changing more things then roll centre.

Increasing KPI increases jacking loads when cornering.. transferring weight from the rear of the car to the front with any kind of steering angle. Much like caster does on the diagonals. Picture a line perpendicular to the strut (in essence the hub of the car) that the wheel attaches to. For any kind of rotation, the outer end of the hub has to move down. That means you have to "lift" the car up with the steering wheel. This is called jacking.

Increased KPI also has some effects on scrubradius. But this might turn out to be better rather then worse when running negative offset rims.

Last effects is that you have a tiny reduction in the motion ratio. Probably nothing worth worrying about.

I'd be interested to take a drive and see how this would feels.