2026 TECHNICAL BULLETINS
IMSA WEATHERTECH CHAMPIONSHIP
Technical Bulletin IWSC #26-01: 10/29/25 2026 Technical Regulations Release: GTD-PRO, GTD
Technical Bulletin IWSC #26-02: 10/29/25 2026 LMP2 Technical Regulations Release
Technical Bulletin IWSC #26-03: 10/29/25 IMSA DBC Updates - GTP, GTD, GTD-PRO
Technical Bulletin IWSC #26-04: 10/31/25 BSSM Update - GTP, GTD PRO, GTD
Technical Bulletin IWSC #26-06: 11/5/25 IMSA Stick Data Collection - 2026 November Daytona Test
Technical Bulletin IWSC #26-07: 11/5/25 Refueling Data Update: GTP, LMP2, GTD-PRO, GTD
Technical Bulletin IWSC #26-08: 11/7/25 IMSA BoP: Daytona Test Event
Technical Bulletin IWSC #26-11: 12/12/25 Spin Test Submission Update: GTP, GTD PRO, & GTD
Technical Bulletin IWSC #26-12: 1/8/26 IMSA BoP: Daytona ROAR and Rolex 24 Events
Technical Bulletin IWSC #26-13: 1/8/26 IMSA GTP Regulations: LMH Regulatory Clarification
Technical Bulletin IWSC #26-14: 1/8/26 IMSA GTP Regulation Clarification
Technical Bulletin IWSC #26-15: 1/8/26 IMSA Data Stick Collection: ROAR and Rolex 24
Technical Bulletin IWSC #26-16: 1/8/26 IMSA Spin Test Data Submission Deadlines: ROAR Before the 24
Technical Bulletin IWSC #26-17: 1/12/26 IMSA GTP Homologation Prior to 2026
Technical Bulletin IWSC #26-18: 1/12/26 IMSA LMDh Technical Regulation 3.11.2
Technical Bulletin IWSC #26-19: 1/15/26 IMSA GTP, GTD PRO, GTD Power Correction Factor: ROAR Event
Technical Bulletin IWSC #26-22: 1/23/26 LMP2 Leader Light - Rolex 24
Technical Bulletin IWSC #26-23: 2/17/26 IMSA DBC Updates - GTP, GTD, GTD-PRO
Technical Bulletin IWSC #26-25: 3/2/26 IMSA GTP, GTD, and GTD PRO Regulatory Control Diagram Update
Technical Bulletin IWSC #26-26: 3/12/26 Sebring 12H Race IMSA Data Sticks - GTP, GTD-PRO, GTD
Technical Bulletin IWSC #26-27: 3/12/26 IMSA LMDh Technical Regulation 3.11.12
Technical Bulletin IWSC #26-28: 3/13/26 IMSA BoP: Sebring 12 Hour Event
Technical Bulletin IWSC #26-30: 4/8/26 IMSA BoP: Long Beach Event
Technical Bulletin IWSC #26-31: 4/16/26 IMSA GTP, GTD Power Correction Factor: Long Beach Event
Technical Bulletin IWSC #26-32: 4/23/26 IMSA DBC Updates - GTP, GTD, GTD-PRO
Technical Bulletin IWSC #26-33: 4/23/26 IMSA GTP, GTD, and GTD PRO Regulatory Control Diagram Update
Technical Bulletin IWSC #26-34: 4/23/26 IMSA BoP: Laguna Seca Event
Technical Bulletin IWSC #26-37c1: 5/22/26 IMSA BoP Corrected: Detroit Event
Technical Bulletin IWSC #26-38: 5/28/26 IMSA GTP, GTD PRO Power Correction Factor: Detroit Event
Technical Bulletin IWSC #26-39: 6/16/26 2026 Technical Regulations Update: LMP2, GTD-PRO, GTD
Technical Bulletin IWSC #26-40: 6/17/26 IMSA BoP: Watkins Glen
Technical Bulletin IWSC #26-42: 6/17/26 Mandatory ADR Firmware Update: GTP, LMP2, GTD-PRO, GTD
Technical Bulletin IWSC #26-44: 6/18/26 Watkins Glen Race IMSA Data Sticks: GTP, GTD-PRO, GTD
Technical Bulletin IWSC #26-46: 7/1/26 IMSA Spin Test Data Submission Deadlines: CTMP Event
Technical Bulletin IWSC #26-47: 7/2/26 IMSA BoP: CTMP Event
Technical Bulletin IWSC #26-48: 7/8/26 IMSA GTD PRO, GTD Power Correction Factor: CTMP Event
IMSA MICHELIN PILOT CHALLENGE
Technical Bulletin IMPC #26-01: 12/17/25 2026 Technical Regulations Release
Technical Bulletin IMPC #26-02: 1/8/26 GS and TCR Data Submission Procedure: ROAR Event
Technical Bulletin IMPC #26-03: 1/8/26 IMSA BoP: Daytona ROAR and Race Events
Technical Bulletin IMPC #26-04: 1/19/26 IMSA BoP: Daytona Race Event
Technical Bulletin IMPC #26-05: 2/19/26 IMSA BoP: Sebring GS Race Event
Technical Bulletin IMPC #26-06: 3/4/26 IMSA Technical Regulations Update: GS and TCR
Technical Bulletin IMPC #26-07: 3/11/26 IMSA BoP: Sebring Race Event
Technical Bulletin IMPC #26-08: 4/20/26 IMSA BoP: Laguna Seca GS Race Event
Technical Bulletin IMPC #26-09: 4/21/26 IMSA BoP: Laguna Seca TCR Race Event
Technical Bulletin IMPC #26-10: 5/26/26 IMSA BoP: Mid Ohio Race Event
Technical Bulletin IMPC #26-12: 6/16/26 IMSA Technical Regulations Update: GS and TCR
Technical Bulletin IMPC #26-13: 6/17/26 IMSA BoP: Watkins Glen Race Event
Technical Bulletin IMPC #26-15: 7/2/26 GS and TCR Data Stick & Submission Requirements: CTMP Event
Technical Bulletin IMPC #26-16: 7/2/26 IMSA BoP: CTMP Race Event
IMSA VP RACING SPORTSCAR CHALLENGE
Technical Bulletin VPRC #26-01: 10/31/25 BSSM Update - GTDX
Technical Bulletin VPRC #26-02: 12/17/25 2026 Technical Regulations Release
Technical Bulletin VPRC #26-03: 2/11/26 Technical Regulations Update: P3
Technical Bulletin VPRC #26-04: 2/13/26 Technical Regulations Update: P3
Technical Bulletin VPRC #26-05: 5/29/26 GSX Data Stick & Submission Requirements: Mid-Ohio Event
Technical Bulletin VPRC #26-06: 6/16/26 IMSA Technical Regulations Update: GSX
Technical Bulletin VPRC #26-07: 7/2/26 GSX Data Stick & Submission Requirements: CTMP Event
PORSCHE CARRERA CUP
Technical Bulletin PCCNA #26-01: 2/6/26 2026 Technical Regulations Release
Technical Bulletin PCCNA #26-02: 3/6/26 2026 Minimum Weights