National Auto Sport Association
  The 25 Hours of Thunderhill Endurance Race  

The Post Event Page
with write-ups and photos

RESULTS: 12 Hour | 25 Hour


The United States Air Force proudly presents the 2003 25 Hours of Thunderhill. Come join top drivers from around the country and the US Air Force in this all-out assault on Thunderhill Raceway Park in Willows, CA.

This will be the sixth year NASA has organized this unique race and believes it will be one of the best years ever. Last year's starting grid saw some nearly 50 cars take the green and expect to bring more competition this year. This prestigious west coast event brings teams from all over the country to compete. Each year the entries are comprised of top teams with drivers such as Davy Jones, Ken Dobson, Roger Foo, Barry Hartzel and Randy Pobst!

Four drivers minimum are required, but there is no maximum. The entry fee covers the cost of the first four drivers and each additional driver is $150.

Are you ready to push yourself to the edge and find out how good you really are? If so, this is your chance to pit yourself against some of the top talent in the country and see if you have what it takes to sit on the podium of this prestigious event. Space is limited, so enter soon!


Toyo offers $6000 in cash prizes to competitors running Toyo Tires

Need a motohome for this event?
Cruise America, the leader in the RV rental industry, is supporting NASA racers across the United States with a great discount program as a benefit of your NASA membership. NASA racers can enjoy a discount off their RV rentals at any of the 147 Cruise America locations nationwide.

NASA 25 Hour Enduro Special from SAMPSON Racing Communications
Only $799 (Save $230 off retail)

300 Degrees, your solution for cryogenic materials treatment, will award $200 for highest placing 12 hour car and $300 for highest placing 25 hour car using 300Degrees services.

To receive and display T&S data you will need a computer, the RMonitor program and a MaxStream 9XStream-PKG-9 radio modem. The radio modem may be ordered from MaxStream directly at 866-765-9885. The price is regularly $250.00, mention your NASA membership and you will receive a discount price of $225 plus shipping.

Clif Bar Inc. provides energy for the 25 Hours at Thunderhill Presented by NASA

Team 19 offers competitors a 25% discount to Racer Net pricing on all Impact Racing Products is your best source for all types of graphics, lettering, custom apparel and promotional products. Between now and the day of the race, we are having a private sale just for you. Members who mention this ad shall receive 25% off on all reflective numbers ordered.

Speedtoys will give out brake pads to eligible first and second place finishers in each of the six classes

Monster Energy(TM) will provide sustained energy for the 25 Hours of Thunderhill Endurance Race Presented by N.A.S.A.

Wheels America will offer a coupon for 4 wheel repairs for the winners
in each class of the 25 hour

25 Hour News Items

JUST ANNOUNCED: The drivers of each 1st place team in the 25-hour Severe Endurance Race will receive one of these Commemorative 25 Hour watches.

This race will be run according to NASA's CCR, Endurance Series Rules, and 25 Hour Enduro Supplement



Listed below are some typical classifications. For further information contact Ali Arsham at 510-222-2601

Note: ALL non-openwheeled cars will fit into a class. There are changes from last year.

  • ES (Unlimited): Anything goes with fenders. Usual cars include World Challenge GT,
    Grand Am Cup Grand Sport, ALMS cars, NASCAR type stock cars.
  • E-0:Honda Challenge 1, small engine stock turbo cars (RX7 single Turbo, 944 turbo, etc), 911 (non turbo and less powerful versions), BMW M3, Mustang Cobra (all meeting IT type prep rules).
    SCCA: World Challenge Touring, some T-2 and T-1 cars
    Grand Am class: GSII
  • E-1: USTCC, CMC, H2 & H3, PS-1, (Integra R, 13B RX7, 240Z, Mustang 5.0, 325i, 944).
    SCCA classes: ITS, most T-2 cars
    Grand AM class: STI.
  • E-2: SM, H4, Pro-7, PCTCC, PS-2 (Integra LS, Civic SOHC, 12A RX7, Miata).
    SCCA classes: SSB, ITA.
    Grand Am class: STII.
  • E-3: GTI, H5, PS-3 (VW 8V, 2002, 510).
    SCCA classes: SSC, ITB, ITC.
    INEX Legends (w/ spec tire and stock fuel cell).
  • E-SR: Sports Racers


About NASA
The National Auto Sport Association sanctions High Performance Driving Events at racing facilities across the country. Whether you would like to learn how to control your car at high speeds, or you are an experienced driver looking for more track time, NASA has an event for you. Click for more information: High Performance Driving Event and About NASA