iRacing Big Block Modified Setup Guide

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iRacing Big Block Modified Setup Baseline Settings

Use these settings as a good starting point for your iRacing Big Block or 358 Modifieds setup.

Tires

10 PSI on front tires
8 PSI on rear tires
1 inch front stagger
0 rear stagger

Suspension

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LF Spring – 250
RF Spring – 150
LR Spring – 250
RR Spring – 150
Shock settings for a tacky track: 9 bump, 2 rebound on left, 2 bump, 9 rebound on right.
Shock settings for a slick track: 6 bump, 9 rebound on RF, all others 9 and 9.
LR Trailing Arm – 30
RR Trailing Arm – 18
Droop Chain – 19.500

Axle Lead – +4/16 (lower if too tight)

iRacing Big Block Modified Setup Speed Tips

Use this guide to get more speed out of your iRacing Big Block or 358 Modified setup.

Ride Heights

Keep your rear ride heights about one inch higher than your front ride heights. (Right rear one inch higher than right front, left rear one inch higher than left front.)
Keep your left side ride heights even with or higher than your right side ride heights.

Other

Keep left rear bite/cross weight as high as possible.
Keep deck height as high as possible.

Bumpy Track Adjustments

For a rough, bumpy track, try these adjustments.

Stiffer springs, especially right front and left rear.
Set both ends of your J-Bar at 12 inches.

Notes

If you adjust spring rates, use the spring perch offsets to reset the ride heights to their original values.
After making any adjustments, make sure your ride heights and left rear bite/cross weight are where you want them to be. Remember, wheel spacing adjustments can have a drastic effect on those values.
To increase left rear bite/cross weight, increase left front and right rear spring perch offsets, and decrease right front and left rear spring perch offsets. If you do it evenly (same number of clicks on all four), your ride heights will stay about the same. Do the opposite to decrease left rear bite/cross weight.