Anti Roll Bar Stiffness Calculation

Lowering the anti roll bar setting will increase body roll and higher settings will decrease body roll.

Anti roll bar stiffness calculation. During equal bump or rebound travel of each wheel the trailing arms swing about their front pivots. My formula for estimating sway bar rate how to measure a sway bar. If the bar is filling up completely while the suspension is loaded down mid corner you need more roll stiffness and increasing the arb settings is one way to do that. The suspension spreadsheet uses these simple formulas to calculate spring and sway bar wheel rates.

This project involves selection of anti roll bar for a light weight sporty vehicle that would provide the requisite auxiliary roll stiffness for a given stiffness value of the springs. If we have a sway bar wheel rate of 300 lb in. Then work out your preferred upgrade from whiteline eibach and h r uprated anti roll bars are one of the most effective ways of improving not only the handling of a car but also outright grip levels. With these two main equations now calculated with a figure for stiffness.

Press calculate to find other values hit reset to clear the form and sample if you want to see a sample calculation. And a sway bar motion ratio of 0 8333 this number squared is 0 6944 we calculate the sway bar rate at the end of the arm to be 300 0. Also for the anti roll bar stiffness values select a roll bar that has adjustable stiffness and try to get one where your calculated stiffness is the centre point of adjustment. This will help with tuning the set up once installed as this is a base set up.

The calculations need to be done while staying within the constraints specified under vehicle level targets. Roll stiffness front rear and total. They can all be added together in series to calculate an overall stiffness for the anti roll bar. Look at the suspension telemetry screen.

A conventional anti roll bar can be incorporated between the trailing arms to increase the body roll stiffness of the suspension or alternatively built in anti roll rubber blocks can be adopted fig. My sway bar formula uses arm leverage arm length bar length bar outside od and inside id diameter or wall thickness in inches to. However due to the way that springs in series need to be added the following equation is used. New anti roll bar stiffness calculator so you can compare different bar sizes to your original bars and also compare different adjustments on the bar.

Then that number simply needs to have 1.