A NEW CHAPTER OF NOR CAL ENDURANCE RACING

SPEEDSF ENDURANCE SERIES

2025 Schedule:

  1. Mar 8-9 Buttonwillow Circuit

  2. May 9-10 Sonoma Raceway

  3. Aug 31 -Sep 1 Thunderhill East

  4. Nov 8-9 Sonoma Raceway

First Event:

2.5 Hours Endurance Race @ Buttonwillow Raceway Circuit

Registration Link

  • 2.5hours race length

    • 3/8 (Sat) :

      Practice & Qualifying

    • 3/9 (Sun):

      2.5 hours Enduro Race

  • Sound limit: Unlimited

  • Paddock camping is available

PRICE:

  • Solo Pricing

    • Early bird $450 (til 2/16)

    • Regular $550 

    • Late $650 (after 3/2)

  • Team Pricing (Multiple cars entries as a team)

    • Early bird $350/car (til 2/25)

    • Regular $450/car 

    • Late $550/car (after 2/25)

Rules & Classification:

Pit stops:

1 Minimum pit stop required. 

  • Pit stops will only be performed at the hot pit, which requires a 5-minute pit time. (In and out of the paddock/hot pit)

  • Refuel must be performed in the hot pit.

  • Tire change is allowed after refueling.

  • A timer will be placed on every vehicle during the pit stop.

Race pace

We will set a delta lap time after the qualifying session. The delta is -1 sec. If your vehicle goes faster than our pre-set lap time by 1 sec of your class, a penalty (Black flag) will be issued.

  • The first black flag will be a drive-through warning letting you know you have exceeded the time. The second black flag will be a two- (2) minute hold. The third black flag will be a five- (5) minute hold. The fourth black flag will result in a disqualification for that race, and the vehicle will be removed from competition for the rest of the day.