Balanced clay substrate — typical Midwest dirt; groove moves out as rubber builds.
New Castle Motorsports Park is a kart track in New Castle, IN. Density altitude, seat position and lead placement, and tire pressure on a tacky-or-slick surface decide your night. The live DA above tells you what the air will give the motor.
As temperature, humidity and barometric pressure shift across the day near New Castle, the density altitude above moves with them — and so should your jetting and tune. Most weather apps show sea-level-corrected pressure, which gives the wrong DA; racer.wiki uses uncorrected station pressure for the real number, the same math a Kestrel runs. Read the full density altitude guide →
Custom race shirts, pit crew hoodies, and all-over print jerseys for New Castle Motorsports Park fans and drivers. Search 725 dirt tracks for logo art, add your number, live mockup — no MyRacePass $72/yr or design fees.
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