[Flieger]

Originally Posted by winders

Excluding aero, and assuming no elevation changes, the sum of vertical loads are always mass x gravity. However, the lateral loads are different and using weight instead of load contributes to confusion in the long run.

Well then, why do you insist on calling vertical loads simply loads? That is rather ambiguous, no? Better to call them weights vs. loads. Or else make it clear by saying vertical loads or lateral loads. Or be like the hip cats and say ||Fz|| and Fy

When a 911 lifts the inside front tire in the air, the outside front suspension is still resisting roll. Yes. If you go faster the car will roll more and the outside front suspension will compress more. No, the weight is the same on the front if we are looking at a pure cornering situation. The weight on the outside front can only amount to the static LF+RF corner weights at a maximum unless there are aerodynamic, longitudinal acceleration, or road curvature forces The roll center does not all of sudden magically move over the outside front tire when the inside front tire comes off the ground. No, the roll center gets closer and closer to the instant center of the outside tire as a greater and greater amount of the total front cornering force is generated by the outside tire. Geometric roll center only applies when the forces are equal, so with no lateral load transfer, or when the two IC's are in the same spot. All this means that your roll center can easily be outside the track.

My race cars lifts the the inside front tire off the ground just a bit going through turn 3a at Sears point. The only reason I know that is that I have seen photos showing it. The handling of the car feels no different at that point. The cars does not change all of sudden when the tire is in the air. Of course not, it is the Fz on each tire that controls the cornering behavior, not the roll stiffness. The corner weights do not change suddenly in a discontinuity, but the roll stiffness does make a sudden shift, meaning the load vs. lateral acceleration or vs. roll angle has a cusp in the curve. The slop changes (reduces). If it did, I would spin off the road as I am near the lateral limits of the car at that point. It does not have an increase in roll so the front outside suspension is still resisting all the roll it was resisting before the front inside tire went in the air.....You aren't understanding. The front provides a roll moment and a pitch moment, but that moment is constant. So yes, it still resists roll but it only resists as much as it did when the Fz on the front inside went to 0. Past that it has a roll stiffness of 0- increasing the front roll will not increase the Fz on the front outside.

You quibble about terminology but you fail to grasp the concepts you are referring to so precisely.