Front Roll Center Height

I'm currently designing a car, it's mainly a road car.

my main problem is that the roll center is most staple at 80mm in front and 100mm in the back

the front roll center is very high but it's very stable both vertically and horizontally in roll, heave and also bumps, lowering it increases the migration a lot. Should I aim for a lower RC and make a compromise in RC stability, or is 80mm on a road car acceptable?

Keep in mind that the track width in the front is 1938mm which is much wider than most cars (usually around 1600mm) the longer track width reduces the angle of the line between contact batch and the RC which decreases jacking forces, not enough though compared to most sports cars that run 20mm front RC or 0mm (ground level) in some cases.

Hi Mohamed, our Suspension Tuning & Optimisation Course is probably a good place to get more in depth info on how roll centre location and migration will affect your handling but I'll see if I can point you in the right direction to research further based on the Suspension Tuning & Optimisation Course.

One thing to consider in your design is perhaps the Centre of Gravity (CoG) Height of your vehicle, and the distance between your CoG Height and Roll Centre Height, as this relationship forms your Roll Moment.

Effectively if the Roll Centre and CoG are stacked on top of each other your Roll Moment is zero and as the Roll centre and CoG move further apart, the leverage of the Roll Moment increases.

Instead of measuring Roll Centre height from the ground and comparing that to a race car, perhaps consider comparing the Roll Moment length compared to a race car since a race car being lower to the ground and having a low centre of gravity makes measuring from the ground less relevant to road car suspension.

I vote for a suspension design that minimizes the the roll center migration, even if it's a bit higher than you wish. There are all sorts of unusual behaviors that confuse you when trying to find the ideal setup when the roll center is moving laterally.