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The International Motor Sports Association (IMSA) provides comprehensive schedules, rules, technical guidelines, and manuals for professional sports car racing circuits.

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IMSA manuals

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2025 Lone Star Le Mans Provisional Schedule & Regulations - IMSA Mustang Challenge

Guide

Official provisional schedule and supplementary regulations for the 2025 Lone Star Le Mans event featuring the IMSA Mustang Challenge and WEC at the Circuit of the Americas, Austin, Texas.

Motul Petit Le Mans 2025 Provisional Schedule and Regulations

Event Guide

Official provisional schedule and supplementary regulations for the 2025 Motul Petit Le Mans event at Michelin Raceway Road Atlanta, featuring IMSA WeatherTech SportsCar Championship, Michelin Pilot Challenge, Porsche Carrera Cup,…

Lone Star Le Mans 2025: Official Schedule & Supplementary Regulations - Circuit of The Americas

Event Schedule and Regulations

Official schedule and supplementary regulations for the Lone Star Le Mans event featuring the Mustang Challenge and WEC at the Circuit of The Americas, September 5-7, 2025. Includes event logistics,…

IMSA Technical Bulletin #25-65: Spin Test Data Submission Deadlines for Motul SportsCar Grand Prix

technical bulletin

Official IMSA technical bulletin detailing spin test data submission requirements, deadlines, and procedures for participants in the Motul SportsCar Grand Prix, including GTD and GTP classes.

IMSA Technical Bulletin #25-67: BSSM Updates for GTP, GTD, GTD-PRO

Technical Bulletin

Official technical bulletin from IMSA detailing updates to the Bosch Scrutineering System Manual (BSSM) for GTP, GTD, and GTD-PRO classes, including changes to torque sensor requirements and transponder information.

IMSA Technical Bulletin #25-64: GTP, GTD, GTD PRO Regulatory Control Diagram Update

Technical Specification

Official IMSA technical bulletin #25-64 dated July 22, 2025, announcing an update to the GTP, GTD, and GTD PRO Regulatory Control Diagrams. Details on Release 2436 and access via NASCAR…

IMSA / CTMP Photo Meeting 2025: A Comprehensive Guide

guide

Detailed information for photographers attending the IMSA / CTMP Photo Meeting at Canadian Tire Motorsport Park from July 11-13, 2025. Includes registration details, photo vest distribution, access information, and specific…

2025 IMSA Motul SportsCar Grand Prix at Road America Official Schedule

schedule

Official schedule and supplementary regulations for the 2025 IMSA Motul SportsCar Grand Prix at Road America, featuring IMSA WeatherTech SportsCar Championship, Michelin Pilot Challenge, Lamborghini Super Trofeo, and Porsche Carrera…

Motul SportsCar Grand Prix at Road America 2025 Provisional Schedule and Supplementary Regulations

Schedule/Supplementary Regulations

The official provisional schedule and supplementary regulations for the Motul SportsCar Grand Prix at Road America, featuring IMSA WeatherTech SportsCar Championship, IMSA Michelin Pilot Challenge, Lamborghini Super Trofeo, and Porsche…

2025 Motul SportsCar Grand Prix at Road America Official Schedule and Supplementary Regulations

Schedule and Regulations

Official schedule and supplementary regulations for the 2025 Motul SportsCar Grand Prix at Road America, featuring IMSA WeatherTech SportsCar Championship, Michelin Pilot Challenge, Lamborghini Super Trofeo, Porsche Carrera Cup North…

IMSA Road America Photo Meeting Guide

guide

A comprehensive guide for photographers attending the IMSA Road America Photo Meeting, covering event details, registration, safety protocols, and photo-video rules.

Sahlen's Six Hours of the Glen 2025 Provisional Schedule and Supplementary Regulations

Schedule/Regulations

The official provisional schedule and supplementary regulations for Sahlen's Six Hours of the Glen at Watkins Glen International, June 19-22, 2025, featuring IMSA WeatherTech SportsCar Championship, IMSA Michelin Pilot Challenge,…