Toyota / Save Mart 350

In-Season Challenge Debut • Heim Momentum • v2.0 Update
Sonoma Raceway
Sunday, June 28, 2026
PURSE: $11,233,037
TV: TNT / HBO Max
STAGES: 25 / 55 / 110

Tech Section: The 1.99-Mile Curvature Notebook

Chassis Compliance over Curbing: Drivers must aggressively hop concrete curbs in the "esses" (Turns 7 and 8). Why? To build an elite single-lap line by straightening the corner. So What? Teams are using low-speed damper blow-off valves to ensure the 3,300lb Next-Gen car returns its tire contact patch to the track instantly, preventing underbody aero disruption.

Downhill Compression & Stagger: Turn 2 drops over 160 feet. Why? Hilly terrain creates a "deficit" in balance. So What? The front suspension is fully loaded under maximum compression while turning, meaning any setup error leads to a massive front-end push into the complex.

Goodyear Racing Eagle (D-5242): A 2,279 mm circumference tire. Why? Proven on road courses like COTA and Watkins Glen. So What? Minimal inflation (LF 22 / RR 17 psi) is critical to survive the thermal loads of the California sun.

Drivers & Teams Intelligence

Corey Heim (#67 23XI): The San Diego winner. Why? His clinical management of low-grip braking zones has the entire Toyota alliance copying his sim loops. So What? While a ringer last week, his momentum makes him a Tier-1 threat on permanent circuits.

Christopher Bell (#20 JGR): Fractured left wrist. Why? Impact from previous race. So What? The curbing vibrations at Sonoma will place massive stress on his injury. Standby driver Brent Crews is on high alert to take over execution duties at the first caution.

Ross Chastain (#1 Trackhouse): Running a special pink watermelon scheme. So What? Beyond the branding, he is a former winner here and targets the $1 million In-Season Challenge prize.