Originally Posted by ziggy12345
Whats the difference when running with or without a rear roll bar?
The roll bar (sway bar)controls the amount of roll that end of the chassis has.
With no roll bar on, the car will roll until the springs stop it thus giving you traction. That being said, it will alsom make the reaction time from going side to side (think chicane) longer and the car might feel a little more lazy.
With the roll bar on, the roll bar helps (the springs still has a factor in side to side roll as well) control the amount of roll the car has and tries to keep the outside wheel down. You'll have a little less traction (depending on the thickness of the roll bar) and the car will be more reactive going side to side.
Try it both ways and see what you like. I personally prefer my cars to have roll bars on, as I like my cars to be more reactive and to slide a bit.