Balanced clay substrate — typical Midwest dirt; groove moves out as rubber builds.
Valley of the Sun QMA is a paved oval in Glendale, AZ. On asphalt, density altitude (shown live above) still sets engine power, but grip comes from tire temperature and chassis balance, not a dry-slick. Watch stagger for tire growth and keep your tune matched to the air.
As temperature, humidity and barometric pressure shift across a race night near Glendale, the density altitude above moves with them — and your tune 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 →
A paved oval like Valley of the Sun QMA gains grip as rubber lays down through the night — watch tire temperature and chassis balance as the surface comes in. How to read the track → · Stagger & tire growth →
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