141 Speedway

Tonight's setup at 141 Speedway

141 Speedway is a 3/8-mile clay oval in Francis Creek, WI. On dirt, three numbers decide your night: density altitude (how much power the air gives you — shown live above), stagger and cross weight (how hard the car turns left), and where the track surface sits in its dry-down. Nail those for tonight's conditions and you are racing, not guessing.

Density altitude at 141 Speedway

As temperature, humidity and barometric pressure shift across a race night near Francis Creek, the density altitude above moves with them — and your jetting and tire pressure should follow. Most weather apps show sea-level-corrected pressure, which gives the wrong DA; racer.wiki uses uncorrected station pressure for the real number. Read the full density altitude guide →

Reading the surface at 141 Speedway

A clay oval like 141 Speedway changes from tacky to dry-slick as moisture evaporates through the night. As it slicks off the car frees up and the fast line moves. How to read the dirt → · Stagger & cross weight →

More WI dirt tracks → · All tracks · Dirt Racing Science →