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2021 TECHNICAL BULLETINS



IMSA WEATHERTECH SPORTSCAR CHAMPIONSHIP

Technical Bulletin IWSC #21-01: 11/20/20 IWSC 2021 Technical Regulations

Technical Bulletin IWSC #21-02: 11/20/20 IWSC LMP3 Daytona Technical Specifications

Technical Bulletin IWSC #21-03: 12/09/20 IWSC LMP3 Base Regulations, Camera and Radio Technical Regulations

Technical Bulletin IWSC #21-04: 12/21/20 Bosch Scrutineering System Manual Updates 

Technical Bulletin IWSC #21-05: 01/13/21 IWSC LMP3 Technical Regulations

Technical Bulletin IWSC #21-06: 01/14/21 Daytona ROAR BoP Tables

Technical Bulletin IWSC #21-06R: 01/24/21 Daytona ROAR BoP Tables 

Technical Bulletin IWSC #21-07: 01/21/21 IMSA ROAR Before the 24 GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-08: 01/21/21 IMSA ROAR Refueling Restrictor Declaration

Technical Bulletin IWSC #21-09: 01/25/21 IWSC LMP3 2021 Daytona Technical Specifications Update

Technical Bulletin IWSC #21-10: 01/27/21 Daytona Race BoP Tables

Technical Bulletin IWSC #21-11: 01/27/21 IMSA Rolex 24 at Daytona GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-12: 01/29/21 IWSC CAN Isolator Removal

Technical Bulletin IWSC #21-13: 03/10/21 Sebring BoP Tables

Technical Bulletin IWSC #21-14: 03/17/21 IMSA Mobil 1 Twelve Hours of Sebring GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-15: 04/23/21 IWSC Technical Regulations Updates

Technical Bulletin IWSC #21-16: 05/05/21 Mid-Ohio BoP Tables

Technical Bulletin IWSC #21-17: 05/14/21 Mid-Ohio GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-18: 05/26/21 IWSC LMP3 Technical Regulations Updates

Technical Bulletin IWSC #21-19: 06/02/21 Mandatory Tire Pressure Monitoring System Updates

Technical Bulletin IWSC #21-20: 06/10/21 IMSA Chevrolet Sports Car Classic GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-21: 06/18/21 Watkins Glen BoP Tables

Technical Bulletin IWSC #21-22: 06/25/21 IMSA Sahlen's Six Hours of the Glen GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-23: 06/27/21 IMSA WeatherTech 240 Technical/Safety Inspection

Technical Bulletin IWSC #21-24: 06/30/21 IMSA WeatherTech 240 BoP Tables

Technical Bulletin IWSC #21-25: 06/30/21 IMSA WeatherTech 240 at The Glen GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-26: 07/08/21 IMSA Northeast Grand Prix BoP Tables

Technical Bulletin IWSC #21-27: 07/15/21 IMSA Northeast Grand Prix GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-28: 07/29/21 IMSA SportsCar Weekend BoP Tables

Technical Bulletin IWSC #21-29: 08/06/21 IMSA SportsCar Weekend at Road America GTD Barometric Pressure Reference 

Technical Bulletin IWSC #21-30: 09/01/21 IMSA Hyundai Monterey SportsCar Championship BoP Tables 

Technical Bulletin IWSC #21-31: 09/10/21 IMSA Hyundai Monterey SportsCar Championship GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-32: 09/17/21 IMSA ACURA Grand Prix of Long Beach BoP Tables

Technical Bulletin IWSC #21-33: 09/23/21 IMSA ACURA Grand Prix of Long Beach GTD Barometric Pressure Reference

Technical Bulletin IWSC #21-34: 09/30/21 IMSA Michelin GT Challenge at VIR BoP Tables

Technical Bulletin IWSC #21-35: 10/07/21 Michelin GT Challenge at VIR GTD Barometric Pressure Reference

IMSA MICHELIN PILOT CHALLENGE

Technical Bulletin IMPC #21-01: 11/20/20 IMPC 2021 Technical Regulations

Technical Bulletin IMPC #21-02: 01/19/21 Daytona ROAR GS BoP Tables Revised 

Technical Bulletin IMPC #21-03: 01/18/21 Daytona ROAR TCR BoP Tables

Technical Bulletin IMPC #21-04: 01/21/21 IMSA ROAR Before the 24 GS Barometric Pressure Reference 

Technical Bulletin IMPC #21-05: 01/26/21 Daytona Race BoP Tables

Technical Bulletin IMPC #21-05R: 01/27/21 Daytona Race TCR Revised BoP Table

Technical Bulletin IMPC #21-05R2: 01/28/21 Daytona Race TCR Revised BoP Table

Technical Bulletin IMPC #21-06: 01/26/21 IMSA Daytona Race GS Barometric Pressure Reference

Technical Bulletin IMPC #21-07: 03/10/21 Sebring Race BoP Tables

Technical Bulletin IMPC #21-08: 03/10/21 Technical Regulation Update 

Technical Bulletin IMPC #21-09: 03/16/21 2021 Sebring - Refueling Restrictor Declaration

Technical Bulletin IMPC #21-10: 03/17/21 IMSA Alan Jay Automotive Network 120 Event GS Barometric Pressure Reference

Technical Bulletin IMPC #21-11: 04/23/21 IMPC Technical Regulations Updates 

Technical Bulletin IMPC #21-12: 05/05/21 Mid-Ohio BoP Tables

Technical Bulletin IMPC #21-13: 05/13/21 IMSA Mid-Ohio 120 Event GS Barometric Pressure Reference

Technical Bulletin IMPC #21-14: 06/14/21 Watkins Glen BoP Tables 

Technical Bulletin IMPC #21-15: 06/24/21 IMSA Tioga Downs Casino Resort 240 at the Glen Event GS Barometric Pressure Reference

Technical Bulletin IMPC #21-16: 06/30/21 IMSA Sahlen's 120 at The Glen BoP Tables  

Technical Bulletin IMPC #21-17R: 07/02/21 IMSA Sahlen's 120 at The Glen GS Event Barometric Pressure Reference

Technical Bulletin IMPC #21-18: 07/08/21 IMSA Lime Rock Park 120 BoP Tables

Technical Bulletin IMPC #21-19: 07/15/21 IMSA Lime Rock Park 120 Event GS Barometric Pressure Reference

Technical Bulletin IMPC #21-20: 07/29/21 IMSA Road America 120 BoP Tables

Technical Bulletin IMPC #21-21: 08/05/21 IMSA Road America Event GS Barometric Pressure Reference

Technical Bulletin IMPC #21-22: 09/01/21 IMSA WeatherTech Raceway Laguna Seca 120 BoP Tables

Technical Bulletin IMPC #21-23: 09/09/21 IMSA WeatherTech Raceway Laguna Seca 120 Event GS Barometric Pressure Reference 

Technical Bulletin IMPC #21-24: 09/30/21 IMSA Virginia is for Racing Lovers Grand Prix BoP Tables 

Technical Bulletin IMPC #21-25: 10/08/21 IMSA VIR Event GS Barometric Pressure Reference


IMSA PROTOTYPE CHALLENGE