Going back to its roots, NASA NorCal presents the 12 Hours of Thunderhill. Twelve straight hours of racing guarantees you will get plenty of windshield time.

• Assigned Paddock and Pit spaces, plenty of time to set up.
• Practice and qualifying on Friday, September 18.
• Racing on Saturday, September 19 from 7:30 AM to 7:30 PM.

Low Entry Fee

ANY number of drivers and crew is all covered by one low entry fee! $2195 pays for everything required.

The Team Racing Endurance Challenge is designed to make endurance racing fun, safe, and accessible — without compromising competition integrity. With flexible tire regulations, straightforward licensing, and minimal barriers for entry, TREC offers a gateway into motorsports for drivers seeking their first taste of endurance racing or seasoned racers looking for more track time. 

• Five time-bracketed classes. This means fair, fun racing, with no impound.
• No NASA license required.
• Daylight only. This means no expensive lighting required.
• Strict NO CONTACT rules enforced.
• Five-minute timed fuel stops (except unlimited class). Greatly reduces costs.
• Standard fueling jugs (except Unlimited class) Keeps costs down.
• Low entry fee. ANY number of drivers and crew is all covered by one low entry fee! $2195 pays for everything required. 
• Live stream TV show covering the race.
• Prizes and awards for top finishers as well as special achievements such as oldest car, hard luck, best effort, etc.

CLASSES: 

Five classes based on your declared lap times:

TREC U Lap times of no faster than 1:45

TREC 3 Lap times of no faster than 1:54

TREC 4 Lap times of no faster than 2:00

TREC 5 Lap times of no faster than 2:05

TREC 6 Lap times of no faster than 2:10

TIRES:

Tires are open. Use any tires including slicks. Only two tires per stop may be changed, except for Unlimited class.

LINK TO RULES: https://nasanorcal.com/wp-content/uploads/2026/04/12-hour-rules-short.pdf

MAKING THE GRID TV SHOW: 

Making the Grid TV show is a behind the scenes show on the new automotive TV channel, PowerTube TV, available on various streaming services such as Roku, Amazon Fire TV, Apple TV, Android TV, etc. They will be focusing on several teams during the race and showing what it takes for a team to participate and finish the race.

For more details, visit https://members.drivenasa.com/events/5334