My last build up I raised the roll center about 3 inches and it didn't seem to change the amount of body roll I had before the change. At best it lessened it a tiny bit, only way I could tell was I broke my swaybar while wheeling (didn't realize it) and in a few really off camber spots it was leaning more than I was used to.I guess my question is would a couple inches higher RC change body roll drasticly.?
Where are your shocks? Depending on their location, and orientation, they can have a huge effect on body roll. There is also the shock valving to consider.the springs are as far out as they can go,
Bigger Valves;7324326]Changing your roll center by a couple inches is not going to make a huge difference. Only major geometry changes will be really noticeable..
4 link in the rear. SAW air shocks and sway bar. Loweres have a little bit of triangulation from the chassis to the axle. Tops are from chassis to middle of the housing. Probably about 4 to 5 inches of seperation at the chassis and about 8 at the axle. Shocks are mounted as far out as possible. Could move the sway bar in a couple holes but want to figure it out before I start bandaiding it. Will try to get pictures tonight.Changing your roll center by a couple inches is not going to make a huge difference. Only major geometry changes will be really noticeable..
Toddy, sounds like you may be having other issues dealing with roll that are possibly geometry issues since it sounds like a torque lift thing.
What's your setup?
Cool, that is the direction I am heading. The rig was sitting a little tall after the rebuild with the shocks being more vertical so I am in the process of experimenting with some shorter/lighter springs along with some valving changes.You're right, in that you can't tell just from looking at a chart like that what the roll characteristics will be like.
Roll motion comes from the center of gravity acting over the roll center, and the bigger that distance is, the more of a 'roll moment' you'll have. Your springs, shocks, swaybar, etc. are what resist the roll motion, and the rate and placement of each of those things is what will make the difference between two given rigs.
This problem is in 2wd, right?4 link in the rear. SAW air shocks and sway bar. Loweres have a little bit of triangulation from the chassis to the axle. Tops are from chassis to middle of the housing. Probably about 4 to 5 inches of seperation at the chassis and about 8 at the axle. Shocks are mounted as far out as possible. Could move the sway bar in a couple holes but want to figure it out before I start bandaiding it. Will try to get pictures tonight.
Toddy
Vetteboy nailed it for ya. The cg and roll center pretty much define how much roll moment is created by a lateral force. Now, what you feel is how that roll moment is reacted by the suspension setup. If the springs and shocks are soft or mounted inefficiently you'll see more body roll for the same roll moment. The geometry dictates your roll moment and how you can change it, but it does nothing to address how your springs, shocks, and roll bar resist it.I am still trying to figure out what determines the body roll potential, so far I have come to the conclusion that the suspension "numbers" aren't going to tell you what you need to know. Both of these setups are very close but one needs a swaybar and one doesn't. The other differences are valving, spring rates and the way the coilovers are mounted.
This problem is in 2wd, right?