September 19th, 2025
The NHRA Tech Department has made clarifications to the Electrical Components section of the 2025 NHRA Rulebook for Section 18: Funny Car and Section 19: Top Fuel. The wording below is the updated section and with the clarifications added. These clarifications are effective immediately.
The 2025 NHRA Rulebook and 2025 Rulebook Amendments will be updated to reflect these clarifications.
2025 NHRA Rulebook, Sections 18 & 19, ELECTRICAL: 8, Electrical Components
ELECTRICAL COMPONENTS
Electrical and electronic components are restricted to ignition systems, data recorders, electrical gauges or indicators, automated fire extinguisher, fuel control system, clutch control system, and engine-shutoff/safety system components only.
The use of electrical/electronic timers to control pneumatic fuel-system valves, and/or electric fuel control solenoid valves, and/or clutch control valves are permitted. Functions of fuel timers, clutch timers, and ignition system must be initiated by wide-open throttle switch only.
A computer-controlled Clutch and fuel controller is acceptable, Electrimotion Top Fuel Command Module 3.0 or 5.0 permitted. Teams must utilize the latest software and firmware provided by Electrimotion.
Teams may also utilize a standalone self-contained controller made by Electrimotion to control clutch and fuel systems. Those self-contained controllers must only control clutch or fuel pressure over a predetermined time.
Output functions of the Electrimotion Command Module clutch control systems may only utilize clutch pressure as a feedback source. Air control systems (for BDK or All Valve) may only utilize their respective fuel or system pressure as a feedback source.
The only accepted control strategy for clutch or fuel systems is pressure (y-axis) over time (x-axis). Clutch pressure can also be controlled by a Hi/Lo clutch pressure strategy only through the accepted Command Module systems.
Safety systems may utilize inputs to monitor engine health (i.e. boost pressure, crankcase pressure, engine speed, etc.) or vehicle speed (i.e. wheel trigger) to trigger the output functions of the Electrimotion Shutoff Device.
All other inputs may be used for data logging purposes only (check NHRA accepted input list) and may not be used for feedback control.
