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two things two remember the real name for a sway bar is an anti swaybar and this is all acting against that big lump of steel aluminium fuel oil and meat in the middle (granted not so much on an rc car) .It will still increase the spring rate on the other side and make more body roll, remember we are going around a corner ,it not just the wheel in bump as this is ride rate not roll rate and it will increase the ride rate just as you have explained
Now if we compress only the right side and move the linkage to this position, the top spring will increase the pressure on both sides, but the pressure on the right side will be more than the pressure on the left side because of the mechanical advantage. (The right side is 90 degrees to the lever while the left is still around 45 degrees.)
What your describing would be a spring rate increase for a one sided suspension load. This I can see. Body roll from lateral cornering forces would be moving both bell crank pivots equally. There may be some resistance due to the mechanical progression curves but I doubt it would do much. I would have to draw that one up to see for sure. The upside that I can see is that it would be a dampened spring unlike a normal sway bar that screws up your spring rate.
Now you guys are talking about what I thought at the beginning ,I think.....................
ill put it another way the porsha LMP2 car in the pic i posted its the same set up just packaged diferent so why do they still run a sway bar?
Probably tuneability. I think BDKW1 pointed it out that the shock would provide damping to the anti sway. The linkage ratios do not allow for any adjustability to the anti sway affects so the anti sway bar could be used to add or reduce the total anti sway resistance or to add preload to one side or the other. I notice that there are still shocks on both sides so that total damping could be adjusted for each side independently and would function independently. The only spring on the car is on the center shock so based on the linkage it would provide some anti sway, but the few percentage change probably isn't enough to eliminate the need for a sway bar. The small amount of wheel travel on that car is going to make the effects even less.