Can someone help me find in the Nhra and Ihra rule books if a timed based output is legal in No box, pro, modified? Thanks

quote:

Originally posted by regal:
Can someone help me find in the Nhra and Ihra rule books if a timed based output is legal in No box, pro, modified? Thanks

IGNITION
Timed ignition-interruption devices (stutter boxes) prohibited.
Starting-line and/or “high-side” rev limiters permitted. Twosteps, rev limiters, or any other rpm-limiting devices, legal unto
themselves but altered or installed so as to function as a downtrack rpm controller, prohibited.

Thanks

NHRA 8:2 DELAY BOXES/DEVICES Additional requirements for handicap start categories that prohibit delay devices:
Wiring may consist of a single (i.e.,
“one” or “1”) continuous wire from a power source to a switch
(or button), and a single continuous wire from the switch to the
transbrake or line-loc solenoid. One splice (no quick-disconnect)
is permitted from the two-step to the solenoid (i.e., between the
switch and the solenoid). All line-loc/transbrake wiring before
and after the switch must be separate from any other wiring and
fully visible. Computer wiring, sensors, relays, and the like may
not be wired to the solenoid wiring.

Time based output such as shifting on time?

So with above wording of the rules having a grid controller is a loophole in the rules to legally have a timer based output in a no box car?

Chris, you are correct.

Using a Grid 7730 with your present analog ignition is absolutely the best Legal way to use timers in N/Ihra No-box. Grid 7730 can even be made to Legally work in FB with timers as well.

Grid 7760 with 7740 can legally offer even more timers.

Depends on where you race and how many rds you win, most tracks are thanks for the $$ you passed tech, but win too many rds and.....

2020 NHRA Rulebook, Support Group 9:1 Computer (Paragraph 3)

Per class requirements, timed or rpm-activated shifters and the like permitted, but all automated functions must be preset before the run. Timer may display only timer amount dialed in; analog or digital display permitted. Devices may be removed at any time at discretion of NHRA Technical Department.