2025 TECHNICAL BULLETINS
IMSA WEATHERTECH CHAMPIONSHIP
Technical Bulletin IWSC #25-01: 08/19/24 2025 Technical Regulations Release: GTD-PRO, GTD
Technical Bulletin IWSC #25-02: 10/25/24 2025 Technical Regulations Release
Technical Bulletin IWSC #25-03: 10/25/24 Spin Test Submission Update: GTP, GTD-PRO, GTD
Technical Bulletin IWSC #25-04: 10/25/24 Refuleing Data Update: GTP, LMP2, GTD-PRO, GTD
Technical Bulletin IWSC #25-06: 11/01/24 IMSA DBC Updates - GTP, GTD, GTD-PRO
Technical Bulletin IWSC #25-07: 11/01/24 IMSA GTP, GTD, GTD PRO Regulatory Control Diagram Update
Technical Bulletin IWSC #25-09: 11/08/24 IMSA Data Stick Collection - 2024 November Daytona Test
Technical Bulletin IWSC #25-10c1: 11/12/24 IMSA BoP: November Daytona Test Event Corrected
Technical Bulletin IWSC #25-12: 11/22/24 IMSA Rolex 24 Post Race Technical Inspection - GTP, GTD PRO
Technical Bulletin IWSC #25-13: 11/22/24 2025 Technical Regulations Update: GTD-PRO, GTD, LMP2
Technical Bulletin IWSC #25-14: 12/11/24 IMSA Data Stick Collection: ROAR and Rolex 24
Technical Bulletin IWSC #25-17: 1/7/25 IMSA DBC Updates - GTD, GTD-PRO
Technical Bulletin IWSC #25-18: 1/9/25 IMSA BoP: Daytona ROAR Before the 24
Technical Bulletin IWSC #25-19: 1/10/25 2025 Technical Regulations Update: LMP2
Technical Bulletin IWSC #25-22: 1/16/25 IMSA GTP, GTD-PRO, GTD Power Correction Factoror: ROAR Event
Technical Bulletin IWSC #25-23: 1/16/25 2025 Technical Regulations Update: GTD-PRO, GTD
Technical Bulletin IWSC #25-24: 1/21/25 2025 Technical Regulations Update: GTD-PRO, GTD
Technical Bulletin IWSC #25-25: 1/22/25 IMSA BoP: Rolex 24 At Daytona Event
Technical Bulletin IWSC #25-27: 2/6/25 IMSA Spin Test Data Submission Deadlines: Sebring Test
Technical Bulletin IWSC #25-28: 2/6/25 IMSA BoP: Sebring Test Event
Technical Bulletin IWSC #25-31: 2/26/25 IMSA GTP, GTD, and GTD PRO Regulatory Control Diagram Update
Technical Bulletin IWSC #25-33: 3/5/25 2025 Technical Regulations Update: GTD-PRO, GTD
Technical Bulletin IWSC #25-34: 3/5/25 IMSA Spin Test Data Submission Deadlines: 12 Hours of Sebring
Technical Bulletin IWSC #25-35: 3/6/25 Sebring 12H Race IMSA Data Sticks - GTP, GTD-PRO, GTD
Technical Bulletin IWSC #25-36: 3/6/25 IMSA BoP: 12 Hours of Sebring Event
Technical Bulletin IWSC #25-37: 3/6/25 IMSA GTP Regulations: LMH Regulatory Clarification
Technical Bulletin IWSC #25-38: 3/6/25 IMSA GTP, GTD, and GTD PRO Regulatroy Control Diagram Update
Technical Bulletin IWSC #25-41: 4/3/25 IMSA GTP, GTD and GTD PRO BSSM Update
Technical Bulletin IWSC #25-42: 4/3/25 IMSA BoP: Long Beach Event
Technical Bulletin IWSC #25-43: 4/10/25 IMSA GTP, GTD Power Correction Factor: Long Beach Event
Technical Bulletin IWSC #25-44: 4/16/25 IMSA DBC Updates - GTD, GTD-PRO
Technical Bulletin IWSC #25-45: 4/30/25 IMSA BoP: WeatherTech Raceway Laguna Seca Event
Technical Bulletin IWSC #25-46c1: 5/1/25 IMSA Spin Test Data Submission Deadlines: WRLS
Technical Bulletin IWSC #25-47c1: 5/28/25 LMP2 Cosworth Bulletins- Corrected
Technical Bulletin IWSC #25-50: 5/22/25 IMSA BoP: Detroit Event
Technical Bulletin IWSC #25-51: 5/29/25 IMSA GTP, GTD-PRO Power Correction Factor: Detroit Event
Technical Bulletin IWSC #25-52: 6/11/25 IMSA BoP: Watkins Glen 6 Hour Event
Technical Bulletin IWSC #25-53: 6/11/25 IMSA DBC Updates - GTP, GTD, GTD-PRO
Technical Bulletin IWSC #25-56: 6/17/25 Watkins Glen Race IMSA Data Sticks - GTP, GTD-PRO, GTD
Technical Bulletin IWSC #25-58: 6/25/25 2025 Technical Regulations Update: LMP2
Technical Bulletin IWSC #25-59: 6/26/25 LMP2 Cosworth ECU Code Update
Technical Bulletin IWSC #25-62: 7/3/25 IMSA BOP: Canadian Tire Motorsport Park Event
Technical Bulletin IWSC #25-63: 7/10/25 IMSA GTD PRO, GTD Power Correction Factor: CTMP Event
Technical Bulletin IWSC #25-64: 7/22/25 IMSA GTP, GTD, and GTD PRO Regulatory Control Diagram Update
Technical Bulletin IWSC #25-66: 7/24/25 IMSA BoP: Road America Event
Technical Bulletin IWSC #25-70: 8/14/25 IMSA BoP: VIRginia International Raceway Event
Technical Bulletin IWSC #25-72: 8/21/25 IMSA GTD PRO, GTD Power Correction Factor: VIR Event
Technical Bulletin IWSC #25-73: 9/10/25 Indianapolis Race IMSA Data Sticks - GTP, GTD-PRO, GTD
Technical Bulletin IWSC #25-74: 9/10/25 IMSA Spin Test Data Submission Deadlines: Indianapolis Event
Technical Bulletin IWSC #25-75: 9/15/25 IMSA BoP: Indianapolis Event
Technical Bulletin IWSC #25-76: 9/15/25 GTP Sentronics System Test: Indianapolis Event
Technical Bulletin IWSC #25-80: 10/1/25 IMSA BoP: Petit Le Mans Event
IMSA MICHELIN PILOT CHALLENGE
Technical Bulletin IMPC #25-01: 10/24/24 2025 Technical Regulations Release
Technical Bulletin IMPC #25-02: 11/22/24 IMSA Technical Regulations Update - GS & TCR
Technical Bulletin IMPC #25-03: 01/08/25 GS & TCR Data Submission Procedure: ROAR Event
Technical Bulletin IMPC #25-04: 1/9/25 IMSA BoP: Daytona ROAR Event
Technical Bulletin IMPC #25-05: 1/16/25 2025 GS Barometric Pressure Reference: ROAR Event
Technical Bulletin IMPC #25-06: 1/21/25 IMSA BoP: Daytona Race Event
Technical Bulletin IMPC #25-07: 1/22/25 2025 GS Barometric Pressure Reference: Daytona Race Event
Technical Bulletin IMPC #25-08: 2/20/25 IMSA BoP: Sebring GS Race Event
Technical Bulletin IMPC #25-09: 3/6/25 IMSA BoP Sebring TCR Race Event
Technical Bulletin IMPC #25-11c1: 5/8/25 IMSA BoP: WeatherTech Raceway Laguna Seca Event Corrected
Technical Bulletin IMPC #25-12: 5/8/25 2025 GS Barometric Pressure Reference: Laguna Seca Race Event
Technical Bulletin IMPC #25-13r1: 5/29/25 IMSA BoP: Mid-Ohio Event revised
Technical Bulletin IMPC #25-14: 6/5/25 2025 GS Barometric Pressure Reference: Mid-Ohio Race Event
Technical Bulletin IMPC #25-15: 6/12/25 IMSA BoP: Watkins Glen Event
Technical Bulletin IMPC #25-17: 7/3/25 IMSA BoP: Canadian Tire Motorsport Park Event
Technical Bulletin IMPC #25-18: 7/9/25 Technical Regulations Update: GS
Technical Bulletin IMPC #25-19: 7/10/25 2025 GS Barometric Pressure Reference: CTMP Event
Technical Bulletin IMPC #25-20: 7/24/25 IMSA BoP: Road America Event
Technical Bulletin IMPC #25-22: 8/12/25 Data Submission Schedule - VIR Event
Technical Bulletin IMPC #25-23: IMSA BoP: VIR Event
Technical Bulletin IMPC #25-24: 8/21/25 2025 GS Barometric Pressure Reference: VIR Event
Technical Bulletin IMPC #25-25: 9/10/25 IMSA BoP: Indianapolis Event
Technical Bulletin IMPC #25-26: 9/18/25 2025 GS Barometric Pressure Reference: Indianapolis Event
Technical Bulletin IMPC #25-27r1: 10/6/25 IMSA BoP: Road Atlanta Event Revised
IMSA VP RACING SPORTSCAR CHALLENGE
Technical Bulletin VPRC #25-01: 2025 Technical Regulations Release
Technical Bulletin VPRC #25-02: 11/01/24 IMSA Bosch Scrutineering System Manual (BSSM) - GTDX
Technical Bulletin VPRC #25-03: 11/22/24 Technical Regulations Update: P3, GTDX, GSX
Technical Bulletin VPRC #25-04: 1/7/25 IMSA Bosch Scrutineering System Manual (BSSM) - GTDX
Technical Bulletin VPRC #25-05: 1/7/25 IMSA DBC: GTDX
Technical Bulletin VPRC #25-06: IMSA BoP: GTDX: Daytona ROAR Before the 24
Technical Bulletin VPRC #25-07: Barometric Pressure Reference; GTDX, GSX: ROAR Event
Technical Bulletin VPRC #25-08: 2/20/25 IMSA GTDX Baseline Specifications: 2025 Season
Technical Bulletin VPRC #25-09: 2/20/25 IMSA GTDX Success Ballast: CoTA Event
Technical Bulletin VPRC #25-10: 2/27/25 Barometric Pressure Reference - GTDX, GSX: CoTA Event
Technical Bulletin VPRC #25-11: 3/5/25 IMSA Bosch Scrutineering System Manual (BSSM) - GTDX
Technical Bulletin VPRC #25-12: 4/3/25 IMSA GTDX BSSM Update
Technical Bulletin VPRC #25-13: 5/27/28 IMSA GTDX Success Ballast: Mid-Ohio Event
Technical Bulletin VPRC #25-14: 6/5/25 Barometric Pressure Reference: GTDX, GSX: Mid-Ohio Event
Technical Bulletin VPRC #25-15: 7/3/25 GTDX Success Ballast: Canadian Tire Motorsport Park Event
Technical Bulletin VPRC #25-16: 7/9/25 Technical Regulations Update: GSX
Technical Bulletin VPRC #25-17: 7/10/25 Barometric Pressure Reference - GTDX, GSX: CTMP Event
Technical Bulletin VPRC #25-18: 8/7/25 IMSA Bosch Scutineering System Manual (BSSM) - GTDX
Technical Bulletin VPRC #25-19: 8/14/25 IMSA GTDX Success Ballast: VIR Event
Technical Bulletin VPRC #25-20: 08/21/25 IMSA GTD and GSX Barometric Reference VIR
Technical Bulletin VPRC #25-21: 10/1/25 IMSA GTDX Baseline Specifications: 2025 Season - Updated
Technical Bulletin VPRC #25-22: 10/1/25 IMSA GTDX Success Ballast: Road Atlanta Event
PORSCHE CARRERA CUP
Technical Bulletin PCCNA #25-01: 2/27/25 2025 Technical Regulations Release
Technical Bulletin PCCNA #25-02: 3/11/25 2025 Minimum Weights