iRacing Dirt Sprint Car Setup Matrix - Old School Racing Motorsports

Rev. 2 – March 7, 2018

Symptom	Remedies
Loose on Entry	Decrease right rear tire pressure Decrease cross weight (will loosen some on exit) Decrease right rear torsion bar diameter* Increase left front and left rear torsion bar diameters* Increase tube heights front and rear Increase left side tube heights front and rear Decrease right rear bump stiffness Decrease left rear rebound stiffness Increase left rear wheel spacing Decrease right rear wheel spacing Change your line
Loose in Middle	Decrease rear stagger Decrease top wing position (move back) Increase top wing angle Increase tube heights front and rear Increase left side tube heights Decrease left front and left rear rebound stiffness Increase left rear wheel spacing Decrease rear end ratio (use a taller gear)
Loose on Exit	Decrease rear stagger Decrease top wing position (move back) Increase top wing angle Decrease right front torsion bar diameter* Decrease right rear torsion bar diameter* Increase front tube heights Decrease right rear bump stiffness Decrease right front rebound stiffness Increase left rear wheel spacing Decrease rear end ratio (use a taller gear) Practice throttle control
Loose Throughout Turn	Decrease rear stagger Decrease top wing position (move back) Decrease right front and right rear spring rates Increase tube heights front and rear Increase left side tube heights front and rear Decrease right rear bump stiffness Decrease right front rebound stiffness Increase left rear wheel spacing Decrease right rear wheel spacing
Tight on Entry	Increase right rear tire pressure Increase cross weight (will tighten some on exit) Increase right rear torsion bar diameter* Decrease left front and left rear torsion bar diameters* Decrease left side tube heights Increase right rear bump stiffness Increase left rear rebound stiffness Decrease left rear wheel spacing Increase right rear wheel spacing
Tight in Middle	Increase rear stagger Increase top wing position (move forward) Decrease tube heights front and rear Increase left front rebound stiffness Decrease left rear wheel spacing
Tight on Exit	Increase rear stagger Increase top wing position (move forward) Decrease top wing angle Increase right front torsion bar diameter* Increase right rear torsion bar diameter* Increase right rear bump stiffness Increase left front and right front rebound stiffness Decrease left rear wheel spacing
Tight Throughout Turn	Increase right rear tire pressure Increase rear stagger Increase top wing position (move forward) Decrease left front torsion bar diameter* Increase right front and right rear bump stiffnesses Decrease left rear wheel spacing Increase right rear wheel spacing

* When making changes to torsion bars or any changes to the chassis that also changes the tube heights, use the torsion bar stops to return the tube heights to their original values.

Bold face remedies are the go-to fixes for each symptom. On the iRacing Sprint Cars, you should be able to stick to those and make any adjustments you need without going any further.

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. The full matrix should fit on one page.