NASCAR iRacing Class A Next Gen Cup Car Setup Matrix

Rev. October 11, 2024

Increase Speed

Handling Feels Good but Car is Slow

Corner Entry

The car might be bottoming out in the front. Ensure the front splitter is sealed properly without scraping the track in the corners.

Stiffen the front springs.
Raise the front ride heights using the left arrow beside front shock collar offsets.
Lower the rear ride heights using the right arrow beside rear shock collar offsets. Lowering the rear will raise the front.

Center

The car might be bottoming out in the front. Stiffen the front springs.
Optimize ride heights.
Optimize right front camber. Look for the left side of the right front tire to be roughly 10° fahrenheit hotter than the middle of the tire after a short run.

Early Corner Exit

Decrease rear spring split to stabilize handling.

Late Corner Exit

Stiffen springs if soft in order to stabilize ride heights.

Short Run Speed

Decrease right front camber
Make camber more negative using the left arrow.
Increase caster
Experiment with higher and lower tire pressures
Make sure the car isn’t bottoming out.

Long Run Speed

Increase right front camber
Make camber less negative using the right arrow.
Experiment with higher and lower tire pressures
Stiffen all springs to stabilize ride heights.
Reduce nose weight to put more weight on rear tires.

More Speed Tips

Adjust rear ride heights to strike the ideal balance between downforce and drag.
The front splitter should stay sealed to the track without scraping in the corners.
Maximize camber on all tires except the right front. For the right front, adjust camber for optimal long-run performance. Use inner, middle, and outer right front tire temperatures as a guide. Typically, more negative right front camber is ideal for qualifying or short runs.
Begin by setting the right-side tire pressures to the minimum. For the left-side tires, adjust the pressures to approximately 60% to 70% of the right-side pressures.
Reduce chassis movement to enhance aerodynamics by using stiffer springs.
Take advantage of every small speed boost you can find—they all add up in the end.
After making any adjustments, double-check that your ride heights are set exactly where you want them.
Some settings will be right on the edge of garage tolerances. Any adjustment could push the setup out of tolerance and cause it to fail tech inspection, so you’ll need to correct that.

Improve Handling

Oversteer (Loose)

Oversteer (Loose) on Entry

Increase nose weight
Increase crossweight
You can increase crossweight by pressing the right arrow next to the ARB preload in the front or the left arrow next to the ARB preload in the rear. Aim to keep your front preload negative. For details on the shock collar offset method, refer to the bottom of the page.

Oversteer (Loose) in Center

Increase crossweight
You can increase crossweight by pressing the right arrow next to the ARB preload in the front or the left arrow next to the ARB preload in the rear. Aim to keep your front preload negative. For details on the shock collar offset method, refer to the bottom of the page.
If loose on throttle, stiffen left rear spring and soften right rear spring
If loose off throttle, soften left rear spring and stiffen right rear spring, increase crossweight

Oversteer (Loose) on Early Exit

Stiffen left rear spring and soften right rear spring

Oversteer (Loose) on Late Exit

Stiffen left rear spring and soften right rear spring on high banks.
For low banks or tracks where the banking decreases on corner exit, stiffen right rear spring and increase crossweight.

Oversteer (Loose) in the Short Run

Increase left rear PSI
Increase right front camber
Make right front camber less negative using the right arrow.

Oversteer (Loose) in the Long Run

Stiffen left rear spring
Use less throttle in turns
Decrease right front camber.
Make right front camber more negative using the left arrow.

Understeer (Tight)

Understeer (Tight) on Entry

Decrease nose weight
Decrease crossweight
You can decrease crossweight by pressing the left arrow next to the ARB preload in the front or the right arrow next to the ARB preload in the rear. Aim to keep your front preload negative. For details on the shock collar offset method, refer to the bottom of the page.

Understeer (Tight) in Center

Decrease crossweight
You can decrease crossweight by pressing the left arrow next to the ARB preload in the front or the right arrow next to the ARB preload in the rear. Aim to keep your preload negative. For details on the shock collar offset method, refer to the bottom of the page.
If tight on throttle, soften left rear spring and stiffen right rear spring.
If tight off throttle, stiffen left rear spring and soften right rear spring, decrease crossweight.

Understeer (Tight) on Early Exit

Soften left rear spring and stiffen right rear spring

Understeer (Tight) on Late Exit

Soften left rear spring and stiffen right rear spring on high banks.
For low banks or tracks where the banking decreases on corner exit, soften the right rear spring and lower the crossweight.

Understeer (Tight) on Short Runs

Decrease the left rear tire pressure.
Decrease right front camber.
Make right front camber more negative using the left arrow.

Understeer (Tight) on Long Runs

Soften the left rear spring.
Increase right front camber
Make right front camber less negative using the right arrow.

Crossweight Adjustment Using Shock Collar Offsets

Decrease crossweight by clicking the arrows indicated in the image below. Use the same number of clicks on each arrow in order to preserve ride heights.

Decrease Crossweight Using Shock Collar Offset

Increase crossweight by clicking the arrows indicated in the image below. Use the same number of clicks on each arrow in order to preserve ride heights.

Increase Crossweight Using Shock Collar Offset

Ride Height Adjustments

When adjusting ride heights, aim to maintain the same crossweight. To check ride heights in a replay, select the best camera angle. You can move the camera with Ctrl+F12 or press Ctrl+Z to freely adjust it using your mouse. Alternatively, you can use telemetry software to monitor your ride heights.

Bottoming Out in the Front

Stiffen the front springs.
Raise the front ride heights using the left arrow beside front shock collar offsets.
Lower the rear ride heights using the right arrow beside rear shock collar offsets. Lowering the rear will raise the front.

Bottoming Out in the Rear

Raise the rear ride heights using the left arrow beside rear shock collar offsets.
Stiffen the rear springs.

Car is Too High in the Front

Lower the front ride heights using the right arrow beside front shock collar offsets.
Raise the rear ride heights using the left arrow beside rear shock collar offsets. Raising the rear will lower the front.
Soften the front springs.

Left Side is Higher

Lower the left-side ride heights using the right arrow beside left shock collar offsets.
Soften left-side and/or stiffen right-side springs.

Right Side is Higher

Lower the right-side ride heights using the right arrow beside right shock collar offsets.
Stiffen left-side and/or soften right-side springs.