sway bar arm length

Within iRacing's asphalt oval stock car vehicles, you will probably notice a little-known setting near the top, or at the front of the vehicle called "sway bar arm length."

iRacing's quick setup guide offers this explanation:[1]

The sway bar arm length can be adjusted in three settings: 14”, 15”, and 16”. This arm is connected from the sway bar itself directly to the lower “A” frame on both the right‐ and left‐front suspension, one arm for each side. Changing the arm length fine‐tunes the stiffness of the sway bar.

A shorter arm will enhance the sway bar’s effect on cornering. A longer arm will lessen the sway bar’s effects. Shorter arms will tighten the car up. This increases the bar’s effective stiffness by reducing the length of the lever‐arm through which the wheel acts on the bar. A longer arm will soften the sway bar and allow the car to turn better. The effects of the sway‐bar‐arm changes will mostly be felt on entrance and exit of the corner, and less so during steady‐state cornering.

Perhaps a more simple explanation from "Truckin' Magazine[2]" might help you understand the concept better:

With regard to sway bar strength, the length of the bar from its bend to the end is where the strength lies, so as a rule of thumb, the shorter the sway bar arm length, the stronger it will be, while the longer the arm length, the weaker. In short, a sway bar eliminates the amount of body roll a vehicle has in a cornering situation, allowing it to go through the corners flatter.

1. iRacing Setup Guide by Dale Earnhardt, Jr. and Barry Waddell for iRacing.com, pg. 15, section v.
2. "Enhance Your Lowered Truck's Ride and Handling - Truckin Magazine" (http://www.truckinweb.com/tech/0409tr_ride_handling_suspension_tips/index.html)
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