iRacing Asphalt Late Model Stock Car Setup Matrix

Rev. October 12, 2024

Increase Speed

Handling Feels Good but Car is Slow

Corner Entry

The car might be bottoming out in the front. Raise the front ride heights using the left arrow beside front spring perch offsets.
Lower the rear ride heights using the right arrow beside rear spring perch offsets. Lowering the rear will raise the front.
Stiffen the front springs on bigger tracks and higher banking. Not recommended on bullrings. Reset ride heights after any spring adjustment.

Center

The car might be bottoming out in the front. Raise the front ride heights using the left arrow beside front spring perch offsets.
Stiffen the front springs on bigger tracks and higher banking. Not recommended on bullrings. Reset ride heights after any spring adjustment.
Optimize right front camber.

Look for the left side (inner side) of the right front tire to be roughly 10° fahrenheit hotter than the middle of the tire after a short run.
Inner – Middle – Outer

Early Corner Exit

Decrease rear spring split to stabilize handling.

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Late Corner Exit

Stiffen springs if soft in order to stabilize ride heights. Not recommended on bullrings.

Short Run Speed

Decrease right front camber
Make camber more negative using the left arrow.
Increase caster
Make sure the car isn’t bottoming out.

Long Run Speed

Increase right front camber
Make camber less negative using the right arrow.

More Speed Tips

Rear end ratio (gear) – Adjust it so that you reach the rev limiter just before lifting at the end of the straight. Try experimenting by increasing or decreasing it by a click or two from that point.
Tire pressures (PSI) – Set all four tires to minimum pressure.
Adjust rear ride heights to strike the ideal balance between downforce and drag. This is important on bigger tracks.
Make sure the car isn’t bottoming out.
Maximize camber on the left front tire. 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.
On large, high-speed tracks, particularly those with substantial banking, use stiffer springs to minimize chassis movement and improve aerodynamics.
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.

Qualifying Setup Tips

Starting with a typical race setup, make the following changes.

Increase Ballast forward to approximately 16″ (if starting at zero) or about 4 clicks.
Qual tape configuration
Increase ARB diameter one or two clicks.
Maximize cambers.
Set toe-in to zero.
Lower fuel fill to 2 gallons.
Set ride heights using spring perch offsets.
Set the left front as low as possible (about 2 inches as long as the front is not scraping). Set the right front about .25 inch higher.
For bullrings, set the rear ride heights close to the maximum of 5 inches. For bigger, higher speed tracks, aim to strike the ideal balance between downforce and drag.
Increase the crossweight if the car is too loose. Use the spring perch offset method below.
Decrease rear end ratio (gear) until you’re not hitting the rev limiter at the end of the straights.

Improve Handling

Oversteer (Loose)

Oversteer (Loose) Throughout Corner

Increase front ARB diameter
Soften the right rear spring, reset ride heights (left arrow).
Lower both track bars.

Oversteer (Loose) on Entry

Decrease left rear track bar height.
Increase ballast forward.
Increase crossweight.
You can increase crossweight by pressing the right arrow next to the ARB arm end. Aim to keep your ARB arm end negative. For details on the spring perch offset method, refer to the bottom of the page.
If loose under braking, increase brake balance bar.

Oversteer (Loose) in Center

Increase crossweight.
You can increase crossweight by pressing the right arrow next to the ARB arm end. Aim to keep your ARB arm end negative. For details on the spring perch 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
Decrease right rear track bar height.

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.
Decrease right rear track bar height.

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Oversteer (Loose) in the Short Run

Increase right front camber.
Make right front camber less negative using the right arrow.

Oversteer (Loose) in the Long Run

Increase crossweight.
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) Throughout Corner

Decrease front ARB diameter
Stiffen the right rear spring, reset ride heights (right arrow).
Raise both track bars.

Understeer (Tight) on Entry

Increase left rear track bar height.
Decrease ballast forward.
Decrease crossweight.
You can decrease crossweight by pressing the left arrow next to the ARB arm end. Aim to keep your ARB arm end negative. For details on the spring perch offset method, refer to the bottom of the page.
If loose tight bracing, decrease brake balance bar.
Back up your corner (lift earlier).

Understeer (Tight) in Center

Decrease crossweight.
You can decrease crossweight by pressing the left arrow next to the ARB arm end. Aim to keep your ARB arm end negative. For details on the spring perch 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
Increase right rear track bar height.

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.
Increase right rear track bar height.

Understeer (Tight) on Short Runs

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

Understeer (Tight) on Long Runs

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

Crossweight Adjustment Using Spring Perch 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.

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.

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 on larger/higher banked tracks. Not recommended for bullrings.
Raise the front ride heights using the left arrow beside front spring perch offsets.
Lower the rear ride heights using the right arrow beside rear spring perch offsets. Lowering the rear will raise the front.

Bottoming Out in the Rear

Raise the rear ride heights using the left arrow beside rear spring perch offsets.
Stiffen the rear springs.

Car is Too High in the Front

Lower the front ride heights using the right arrow beside front spring perch offsets.
Raise the rear ride heights using the left arrow beside rear spring perch offsets. Raising the rear will lower the front.
Soften the front springs if possible.

Left Side is Higher

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