You are here: Home / iRacing Dirt Late Model Setup Matrix

iRacing Dirt Late Model Setup Matrix

Rev. 3 - May23, 2017
Symptom Remedies
Loose on Entry
  • Decrease RR Tire Pressure (Tightens car throughout turn.)
  • Increase Toe-In
  • Increase Brake Pressure Bias
  • Increase LF Spring Rate*
  • Decrease RF Spring Rate*
  • Decrease LR Spring Rate*
  • Increase RR Spring Rate* (May loosen car on exit.)
  • Increase LF Bump Stiffness
  • Decrease RF Bump Stiffness
  • Decrease RR Bump Stiffness (May tighten car throughout corner.)
  • Decrease LR Rebound Stiffness
  • Increase Left Upper Trailing Arm (Will loosen car on exit.)
  • Decrease Right Upper Trailing Arm (Will loosen car on exit.)
  • Increase Chassis J-Bar Height**
  • Increase Ballast Forward (Decrease Rear Weight)(May loosen car on exit.)
  • Decrease Axle J-Bar Height**
  • Decrease J-Bar Height at Both Ends**
  • Decrease Cross Weight / Left Rear Bite (May loosen car in middle and on exit.)
  • Increase Axle Lead (Will tighten car throughout turn.)
Loose in Middle
  • Decrease RR Tire Pressure (Tightens car throughout turn.)
  • Decrease RF Bump Stiffness
  • Decrease RR Bump Stiffness (Tightens car throughout the turn.)
  • Decrease LF Rebound Stiffness
  • Decrease LR Rebound Stiffness
  • Increase RR Rebound Stiffness
  • Increase Chassis J-Bar Height**
  • Increase Ballast Forward (Decrease Rear Weight)(May loosen car on exit.)
  • Decrease Axle J-Bar Height**
  • Decrease J-Bar Height at Both Ends**
  • Increase Axle Lead (Will tighten car throughout turn.)
Loose on Exit
  • Decrease RR Tire Pressure (Tightens car throughout turn.)
  • Decrease Rear Stagger
  • Increase RF Spring Rate* (May loosen car on entry.)
  • Increase LR Spring Rate* (May loosen car on entry.)
  • Decrease RR Spring Rate* (May loosen car on entry.)
  • Decrease LF Bump Stiffness (May tighten car on entry.)
  • Increase RF Bump Stiffness
  • Increase LR Bump Stiffness
  • Decrease RR Bump Stiffness (May tighten car throughout turn.)
  • Decrease LF Rebound Stiffness
  • Decrease RF Rebound Stiffness
  • Decrease Left Upper Trailing Arm (Will loosen car on entry.)
  • Increase Right Upper Trailing Arm (Will loosen car on entry.)
  • Decrease J-Bar Height at Both Ends**
  • Increase Axle Lead (Tightens car throughout turn.)
Loose Throughout Turn
  • Decrease RR Tire Pressure
  • Decrease RR Bump Stiffness
  • Decrease J-Bar Height at Both Ends**
  • Increase Axle Lead
Tight on Entry
  • Increase RR Tire Pressure (Loosens car throughout turn.)
  • Decrease Toe-In
  • Decrease Brake Pressure Bias
  • Decrease LF Spring Rate*
  • Increase RF Spring Rate*
  • Increase LR Spring Rate*
  • Decrease RR Spring Rate* (May tighten car on exit.)
  • Decrease LF Bump Stiffness
  • Decrease LR Bump Stiffness
  • Increase RR Bump Stiffness (May loosen car throughout corner.)
  • Increase LR Rebound Stiffness
  • Decrease Left Upper Trailing Arm (Will tighten car on exit.)
  • Increase Right Upper Trailing Arm (Will tighten car on exit.)
  • Decrease Chassis J-Bar Height**
  • Decrease Ballast Forward (Increase Rear Weight)(May tighten car on exit.)
  • Increase Axle J-Bar Height**
  • Increase J-Bar Height at Both Ends**
  • Increase Cross Weight / Left Rear Bite (May tighten car in middle and on exit.)
  • Decrease Axle Lead (Loosens car throughout turn.)
Tight in Middle
  • Increase RR Tire Pressure (Loosens car throughout turn.)
  • Increase RF Bump Stiffness
  • Increase RR Bump Stiffness (May loosen car throughout corner.)
  • Increase LF Rebound Stiffness
  • Increase LR Rebound Stiffness
  • Decrease RR Rebound Stiffness
  • Decrease Chassis J-Bar Height**
  • Decrease Ballast Forward (Increase Rear Weight)(May tighten car on exit.)
  • Increase Axle J-Bar Height**
  • Increase J-Bar Height at Both Ends**
  • Decrease Axle Lead (Loosens car throughout turn.)

 

Tight on Exit
  • Increase RR Tire Pressure (Loosens car throughout turn.)
  • Increase Rear Stagger
  • Decrease RF Spring Rate*
  • Decrease LR Spring Rate*
  • Increase RR Spring Rate*
  • Decrease LR Bump Stiffness
  • Increase RR Bump Stiffness (May loosen car throughout corner.)
  • Increase LF Rebound Stiffness
  • Increase RF Rebound Stiffness
  • Increase Left Upper Trailing Arm (Will make car tighter on entry.)
  • Decrease Right Upper Trailing Arm (Will make car tighter on entry.)
  • Increase J-Bar Height at Both Ends**
  • Decrease Axle Lead (Loosens car throughout turn.)
Tight Throughout Turn
  • Increase RR Tire Pressure
  • Increase RR Bump Stiffness
  • Increase J-Bar Height at Both Ends**
  • Decrease Axle Lead


* If you adjust the springs, use the spring perch offset adjustment to put the ride height back where it was originally. This is important.
** The j-bar remedies in the matrix represent what the j-bar is supposed to do to the car. I have not had any significant results with adjusting the j-bars in the iRacing Late Models. Sometimes the cars seem to feel a little different, but there doesn't seem to be any effect on the looseness or tightness of the car in any part of the corner.

Bold face remedies are the go-to fixes for each symptom. You might try those remedies first.

Coming soon, I'm going to try to put together a basic setup guide that will expand on the matrix and attempt to explain what some of the settings do. If you're interested in building good setups, you should know a little bit about why a setting does what it does.

If you see any errors or have any questions, I can usually be found in Discord.

Note: To print the matrix, use Google Chrome and highlight (select) only what you want to print. Right-click and click print. Google Chrome will send only the highlighted selection to the printer by default. Full matrix with footnotes will fit on two pages.

Reader Interactions