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NHRA releases revisions to wiring of electronics
12/13/2002
In an effort to better clarify the wiring of delay boxes, data recorders, tachometers, and other related devices, NHRA has developed the following rule revisions to the 2003 NHRA Rulebook, specific to the Super classes.
On page 49 of the 2003 NHRA Rulebook, four delay devices from three manufacturers are listed as being accepted. Some of these also contain data recorders, automatic shifters (based on time and/or rpm), throttle stop controllers, tachometers, and other output terminals that may be used for various other functions.
To further clarify the proper usage, the following has been added to the delay box/device section of the 2003 NHRA Rulebook:
"No wiring shall be connected directly, or indirectly, between any part of the ignition system and the delay box/device. The rpm-based automatic shifters that are incorporated into some delay boxes/devices may not be used for any purpose. The built-in tachometer that is incorporated into some delay boxes/devices may not be used for any purpose.
"Also, no wiring shall be connected directly, or indirectly, between any part of the ignition system and the delay box/device other than the two-step/launch control wire that splices into the transbrake or line-loc control wire."
With the addition of this wording, the need of limiting the use of microprocessor units to four per manufacturer has been eliminated from the Rulebook. At the same time, beginning Jan. 1, 2003, all new delay box/devices manufactured after this date must be NHRA-accepted prior to usage.
On page 47, in the Transmission, Automatic section, it permits the transmission to be shifted with a preset timed or a preset rpm-activated (but not both) electrical, mechanical, pneumatic, or hydraulic device or by standard OEM operation only. Shift timer control may display timer settings only, analog or digital permitted. To clarify this section, the rpm-based automatic shifters may not have a time delay incorporated into the device. RPM-based automatic shifters may not be connected (directly or indirectly) to the delay box/device. Time-based automatic shifters may not be connected (directly or indirectly) to the ignition system.
The last area of importance is the data recorder section on page 216 of the General Regulations on the activation of the data recorder. A separate switch that requires a separate action (with respect to all other devices) must activate the data recorder by the driver or crew person. The switch may neither be connected to nor be incorporated into any other device or component.
Danny Gracia, National Tech Director, the addition and elimination of wording to the effected sections was done, "in effect to divorce the delay box/device, ignition system, and data recorder from each other. These changes only allow the delay device to be attached to the transbrake, shift timer, and/or throttle timer. It then eliminates the wires that have connected the delay device to the ignition system, the tachometer, the data recorder, or rpm-activated automatic shifters, which will make this area easier to police in the future."
Return to 2002 Sportsman News Archive