The following changes are for 05/11/2026:  See the latest amendments document for complete details.

Transmission pressure manipulation, such as bypassing or dumping of line or converter feed pressure, permitted only on turbocharged entries. All pressure manipulation devices must be external. Internal pressure manipulation devices prohibited. All pressure manipulation (electronic or hydraulic) must end upon the release of the transbrake or any other device used when launching the vehicle. If pressure manipulation devices is electrical it must be wired directly to the transbrake and cannot be connected to the ECU.

Pressure regulating devices are permitted but must be at a fixed pressure from engine start up to engine shut off. Converter pressure and line pressure must be recorded with a 500 psi sensor each pass and visible in the data logger.

Transmission accumulator permitted, maximum capacity of 1 quart. Accumulator must be self-contained and may not have any external connections or controllers. See NHRA Accepted Products on NHRA Racer for transbrake button wiring diagrams. See General Regulations 2:12, 2:13, 2:14.