Last reviewed: November 12, 2026 · By the RaceYear team
Short answer: A 1/10 carpet oval pan car is tuned with tires first, then ride height, front springs and caster, the rear pod's side springs and center shock, and tweak. For a loose car, the usual fixes are softer side and center springs, stiffer front springs, more caster or a harder front tire. For a push, do the reverse.
Key takeaways
Setup note: These are typical directions to test from your chassis manual's baseline. Pan car designs differ, so check your kit's manual and your class rules for tires, motors and body.
A pan car looks simple: a flat chassis, a front end, a rear pod and four tires. That's exactly why small changes matter so much. On a carpet oval, there's no bump to blame and no dirt to change. If the car went from good to loose, something on the car changed, and your setup sheet is where you find it.
Tires are where to start. Pan cars run foam or rubber depending on class, and many classes allow traction compound ("sauce"). How long you let sauce soak, and on which tires, changes grip a lot, so log it every run along with the tire diameter if you true foams.
The direction is consistent across pan car guides. A Customworks manual quoted in an RCTech pan car thread lists a harder front tire or softer rear tire as a fix for loose, and the reverse for push. Saucing works the same way: more grip at one end moves the balance toward the other.
Start where your manual says. The manual quoted in that thread starts at about 1/4 inch at all four corners and warns that 1/16 inch makes a real difference. It also gives the direction: front higher than rear helps rear traction off the corner; front lower helps front traction on entry. Raise the front and lower the rear for a loose car, and reverse it for a push.
Foam tires shrink as they wear and as you true them, so recheck ride height every time you true or swap tires.
Kingpin springs. Stiffer front springs reduce steering grip and add push. Softer springs add steering, but too soft can bind, so stay within your kit's range.
Caster. More caster adds stability and helps a loose car. Less caster helps a car that pushes, especially off the corner.
Camber. On an oval, right-side tires lean toward the chassis and left-side tires lean away. Adding camber in that direction adds cornering grip up to a point. Check tire wear: an edge wearing much faster says you went too far.
The rear pod pivots on the chassis, and three things control it.
Tweak is the side-to-side weight balance across the rear. On an oval, many racers run it on purpose. The manual quoted in the thread says left-down tweak adds left-rear weight and makes the car tighter, while tweak toward the right rear makes it looser. One way to check it: lift the rear by the pod and watch which tire leaves the table first.
Change tweak in small steps and keep notes on which collar you turned and how far. Our guide to corner weighting an RC car covers measuring it.
By rollout. Tire diameter changes as foams wear and get trued, so the same pinion gives you different rollout from week to week. Calculate rollout from your measured tire size each night, and change gearing one tooth at a time while watching motor temperature. The full method is in RC gear ratio and rollout.
| Change | Loose car (try) | Pushing car (try) |
|---|---|---|
| Tires | Harder front or softer rear | Softer front or harder rear |
| Ride height | Raise front, lower rear | Lower front, raise rear |
| Front springs | Stiffer | Softer |
| Caster | More | Less |
| Side springs | Softer | Stiffer |
| Center shock | Softer | Stiffer |
| Tweak | Add left-rear weight | Remove it |
| Battery position | Toward center | Toward the left |
Directions from the Customworks manual quoted in the RCTech thread. Make one change per run and log the result.
Tires. Check that the sauce, soak time and tire diameter match your last good night before you touch springs or tweak.
Many oval racers run some left-rear weight on purpose. Start with your manual's baseline and add it in small steps if the car is loose.
Foam tires wear, the carpet picks up rubber, and sauce soaks in differently. Log tire size and conditions each run so you can tell which one moved.
A notebook can hold this, but tweak turns, sauce times and tire sizes add up fast. RacerRX covers carpet oval pan cars, works offline at the track, saves setups on your phone with a backup to your account, and has a rollout calculator and AI tuning built in.
Terms you don't know are in the RaceYear racing glossary.
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