iRacing Asphalt Late Model Stock Car Setup Matrix

This is a more friendly text format for the iRacing Asphalt Late Model Stock Car Setup Matrix.

Rev. March 23, 2023

Oversteer Throughout Corner (Loose)

• Raise RF PSI
• Stiffen RF spring
• Raise RF camber (less negative)
• Lower LF PSI
• Soften LF spring
• Lower LF camber (less positive)
• Increase front sway bar size
• Shorten front sway bar arm
• Increase front stagger
• Increase ballast forward
• Lower RR PSI
• Soften RR spring
• Lower LR PSI
• Stiffen LR spring
• Lower LR and RR track bars
• Decrease rear stagger
• Increase cross weight

Understeer Throughout Corner (Tight)

• Lower RF PSI
• Soften RF spring
• Lower RF camber (more negative)
• Raise LF PSI
• Stiffen LF spring
• Raise LF camber (more positive)
• Decrease front sway bar size
• Lengthen front sway bar arm
• Decrease front stagger
• Decrease ballast forward
• Raise RR PSI
• Stiffen RR spring
• Raise LR PSI
• Soften LR spring
• Raise LR and RR track bars
• Increase rear stagger
• Decrease cross weight

Oversteer Entering Corner

• Raise RF PSI
• Stiffen RF Spring
• Raise RF camber (less negative)
• Lower LF PSI
• Soften LF spring
• Lower LF camber
• Lower toe-in (more negative)
• Increase front sway bar size
• Shorten front sway bar arm
• Increase front stagger
• Increase ballast forward
• Lower RR PSI
• Soften RR spring
• Raise LR PSI
• Stiffen LR spring
• Lower LR track bar
• Increase cross weight

Understeer Entering Corner

• Lower RF PSI
• Soften RF spring
• Lower RF camber (more negative)
• Raise LF PSI
• Stiffen LF spring
• Raise LF camber (more positive)
• Raise toe-in (less negative)
• Decrease front sway bar size
• Lengthen front sway bar arm
• Decrease front stagger
• Decrease ballast forward
• Raise RR PSI
• Stiffen RR spring
• Lower LR PSI
• Soften LR spring
• Raise LR track bar
• Decrease cross weight

Oversteer in the Middle of the Corner

• Raise RF PSI
• Stiffen RF spring
• Lower LF PSI
• Soften LF spring
• Increase frong sway bar size
• Increase front stagger
• Lower RR PSI
• Soften RR spring
• Raise LR PSI
• Stiffen LR spring
• Decrease rear stagger
• Increase cross weight

Understeer in the Middle of the Corner

• Lower RF PSI
• Sofren RR spring
• Raise LF PSI
• Stiffen LF spring
• Decrease front sway bar size
• Decrease front stagger
• Raise RR PSI
• Stiffen RR spring
• Lower LR PSI
• Soften LR spring
• Increase rear stagger
• Decrease cross weight

Oversteer Exiting Corner

• Raise RF PSI
• Stiffen RF spring
• Raise RF camber (less negative)
• Lower LF PSI
• Soften LF spring
• Lower LF camber (less positive)
• Increase front sway bar size
• Lower RR PSI
• Soften RR spring
• Raise LR PSI
• Stiffen LR spring
• Lower RR track bar
• Decrease rear stagger
• Increase cross weight

Understeer Exiting Corner

• Lower RF PSI
• Soften RF spring
• Lower RF camber (more negative)
• Raise LF PSI
• Stiffen LF spring
• Raise LF camber (more positive)
• Decrease front sway bar size
• Raise RR PSI
• Stiffen RR spring
• Lower LR PSI
• Soften LR spring
• Raise RR track bar
• Increase rear stagger
• Decrease cross weight

Additional Late Model Stock Car Setup Notes

• Bumpstops limit suspension travel. A bumpstop is intended to stop suspension travel before other supsension components make contact with something that might cause damage. In iRacing, bumpstops behave a little like a spring. With soft springs, you can use bumpstops to prevent  the supsension from traveling past a certain point. This is especially useful if the car is bottoming out or hitting the track surface. Packers are shims that change the height of the bumpstops. You can add packer shims (increase packer) to force the suspension to stop compressing earlier, thereby preventing the chassis from hitting the track surface. Keep in mind that, if the suspension hits the bumpstops, they act like very stiff springs, and the suspension is unable to compress any further at that point.
• Siffer front springs make the car tighter. Softer front springs make the car looser. Stiffer rear springs make the car looser. Softer rear springs make the car tighter.
• When adjusting shocks, higher numbers are stiffer.