Autocross Challenge Rules


Super Late Model

  • All rear engine, mid engine, AWD and C5-C8 Corvette

Late Model

  • 1988 and up vehicles (including applicable trucks)

Mid Muscle

  • 1973-1987 and up vehicles (includes applicable trucks, C4, 2nd and 3rd generation Camaro, and Fox Body Mustangs)

Vintage Muscle

  • Vehicle through 1972 (including applicable trucks and C1-C3)

UMI management reserves the right to adjust classing at any time up until the start of the event

Exhibition Class

  • If your vehicle does not fall into one of the four classes or does not meet the rule requirements (i.e. Go Kart, Hoosiers, Kuhmo ACR) you may participate for fun only.
  • If you are unsure if your car is legal, please contact us for approval.
  • 2 second default cone penalty.
  • Any fuel, aero or power adders permitted.
  • Please do not approach the timing trailer. The timing team receives information from the track workers. Contact the pit steward with any competition questions.
  • In all cases the UMI race director’s decision is final.
  • No vehicle weight limit for Autocross Challenge. If you qualify for KOTM your vehicle will need to follow the KOTM weight limit of 2900lbs. with driver.
  • 200TW as per SCCA® National Solo® Rules 2020 Sec 13.3 or with 2021 updates.
  • Fender cutting, flaring and non-standard wheel sizes are allowed.
  • Tires are permitted to be changed at any time. Multiple sets permitted.
  • No active, powered tire warmers.
  • 2021 Update : The Kumho ECSTA V720 ACR is no longer permitted.
  • Helmets required as per SCCA 4.3.1 anytime a car is on track.
    • Snell ratings: SA2015, SAH2015, SA2010, SAH2010, SA2005, M2015, M2010, M2005
    • SFI ratings 31.1, 31.1A, 3.12, 31.2A, 31.1 2005, 41.1, 41.1A, 41.2, 41.2A, 41.2  2005, 24.1
    • FIA Ratings:  8860-2010, 8860-2015
    • ECE R22.05
    • BS6658-85 Type A/FR, BS6658-85 Type A
  • Five point harness and racing seats recommended.
  • On board fire extinguisher recommended.
  • Typical autocross safety rules should be followed such as secure lug nuts, secure battery, no loose objects in the driver’s compartment.