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Roll Centre/Bump Steer Correction for Double Wishbone

Motorsport Wheel Alignment Fundamentals

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Discussion and questions related to the course Motorsport Wheel Alignment Fundamentals

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In your course video on Roll Centre/Bump Steer Correction, you mentioned that roll center/bump steer correction via aftermarket ball joints/ball joint spacers in conjunction with bump steer adjustment kits are more relevant for MacPherson front suspension systems, and applying this option to a double wishbone will affect the upper/lower wishbone relationship and subsequently the rest of the suspension geometry.

Does this mean this option is not really suitable for double wishbone setups, especially if done without proper measurements? The video offered an alternate option of raising the subframe but that seems to apply to multilink suspension only.

I'm coming from the Honda S2000 scene with a plethora of aftermarket RCA ball joints and rear toe control arms that many simply "slap" them on lowered cars to "make the lower arms horizontal" - is there any benefit doing this to lowered cars vs letting the lower arms point upwards towards the wheel?

Thank You.

PS>I've only watched till this part of the course, apologies in advance if this is covered in later videos.

Pretty much the same reason as for struts, the angle of the traverse linkages - wishbones - sets the roll centre(s).

The main affect is the roll centre height affects the roll resistance of the suspension, so stiffer anti-roll (sway) bars would normally be required to try and counter that. A secondary affect is it may affect the camber gain in roll.

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