Attention all Sonoma Shifter Limited drivers

Attention all Sonoma Shifter Limited drivers:

After speaking with a few team owners and drivers, the Challenge of the Americas would like to extend an offer to your class members.
As there is no Rok Sonoma event for the month of April, we are offering a unique weekend package for the Shifter Limited class, which consists of:
  • No Friday practice, as we know that consistent with your class name, your time is limited as well.  
  • Only one set of race tires for the weekend, as we will run a special format of 3 short heat races, a pre-final and one final over the course of the weekend.  
  • Saturday morning will consist of 2 practice sessions and one qualifying session.   Saturday afternoon will consist of heat one and two.
  • Sunday will have another warmup and your final heat.  Sunday afternoon will consist of your pre-final and final.  
  • This should add up to close to 60 laps of racing for the weekend!
With no Friday practice and only one set of tires, your weekend entry with fuel/oil is only $900.  
In order for this to make sense for everyone, we need at least 10 entries by Friday March 22nd  in order to have enough time to have a set of awards built.  
Please go to the registration page and download the Sonoma Shifter Limited specific entry form. Simply fill in your personal information and your payment information and email it to by 3/22 at midnight. We will not process your credit card until we reach 10 entries.
Entry forms without payment information will not count as an entry.  Remember we need 10 entries for this to make sense for everyone. When we hit 10, we will process the cards.  
In addition, Ron White Racing has pledged $500 to the winner of the class!!!!!!
It’s up to you to make this happen! Come have some fun at THE CHALLENGE of the AMERICAS.

Sonoma Registration & Information

Sonoma Registration is now open.
After two exciting race weekends in Arizona we are saying goodbye to the Sonoran Desert and hello to California and Sonoma wine country. Registration is open for the closing rounds of the 2024 Challenge of the Americas season at Sonoma Raceway. R5/R6 will take place April 12-14 on the National CW circuit, as we get set to crown the 2024 champions. Enter here –

Pre Entry Deadline:
In order to fit everyone into a very small paddock & the need to have accurate fuel and tire projections for the final weekend, pre-entry will close at midnight 3/31

Event Info:

Westbound State Route 37 Full Highway Closures at State Route 29 Continue reading

Challenge of the Americas Sets Prize Package for 2024

Challenge of the Americas Sets Prize Package for 2024 with P1 Engines and Italian Motors Providing Additional Cash

The 17th season for Challenge of the Americas is a new era for the west coast winter series. Welcoming the Vega Tire as the official brand for the Challenge, the categories have also opened up to allow both ROK and IAME engine brands, in addition to the KZ platform for shifter competition. The prize package has also been altered for the 2024 season, welcoming a cash prize of $3,000 in total for each of the six categories competing this year – 60cc Cadet, 100cc Junior, 100cc Senior, 100cc Masters, Shifter Senior, and Shifter Masters.

Dating back to the start of The Challenge, tickets to each program’s ‘big event’ were awarded to the champions. Now that the series has become independent, The Challenge has moved to a cash purse for the 2024 championship prize package.

Challenge of the Americas will award cash prizes to the top-three finishers in the championship standings for all classes. The breakdown is as follows: 1st – $1,500 / 2nd – $1,000 / 3rd – $500.

Adding to the prize package for the championship podium is longtime series supporter P1 Engines. Jesus Vasquez and P1 have pledged an additional $1,500 to the championship podium for any class that averages 30 or more entries for the six rounds of The Challenge. That equates to the following breakdown: 1st – $2,000 / 2nd – $1,500 / 3rd – $1,000.

In 2023, both Senior 100cc and Junior 100cc averaged over 30 entries for the series. As of the final ‘Happy Hour’ pre-registration period on January 23, each class has reached the 30-mark for the upcoming opening weekend with at-track entries expected in all classes.

In addition, Italian Motors has stepped up with an additional $500 to the Shifter Senior and Shifter Masters championship prize package, provided that championship was earned with a TM KZ or X125 KZ (same as the homologated Modena KK3).

Challenge of the Americas kicks off the 2024 program at the Musselman Honda Circuit in Tucson on February 2-4. To learn more about The Challenge, head to

As Pre Entry Deadline Looms P1 Engines Adds to 2024 Prize Packages

PRE ENTRY DEADLINE IS MIDNIGHT TONIGHT – As entries roll in for our opening event at the Musselman Honda Circuit in two weeks we are still refining the complete 2024 prize package. All awards will be announced in the coming days, but Jesus Vasquez of P1 Engines Inc. just made things more interesting for the larger classes by adding an additional $1500 to the podium haul of any class that averages 30 or more entries for the 6 race series.

There is no catch like having to run a P1 motor, P1 sticker or even saying hi, just generous support of the series. 100cc Junior and 100cc Senior both surpassed that threshold in 2023, and they are on the verge of eclipsing it with one day left to pre enter.

Get your entries in today before the midnight deadline to make sure you have a chance to earn your championship and win a piece of this great prize.

Thank you again to Jesus Vasquez and P1 Engines for his continued support and trust in the Challenge.

Enter now:

Challenge of the Americas Drops OK-N Class in 2024

Challenge of the Americas has confirmed the OK-N category has been dropped from the program due to lack of ‘competitor commitment’.

The class averaged 9 entries over the three events in 2023, and as of today only had 2 pre-entries.

The Challenge kicks off on February 2-4 at the Musselman Honda Circuit, nearing the 80-entry mark for the remaining 6 classes. Three more days remaining for pre-registration.