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Join Date: Mar 2006
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Re: Line lock and Two step in a clutch car
Per Section 10A Page 11
DELAY BOXES/DEVICES Two-step permitted. Two-step must be foot activated through brake
pedal, clutch pedal, or pressure switch. Hand release prohibited. See General Regulations 8:2, 8:8.
ELECTRICAL/CONTROL: 8
8:2 DELAY BOXES/DEVICES
Prohibited in Top Fuel, Funny Car, Pro Stock, Pro Stock Motorcycle,
Top Alcohol Dragster, Top Alcohol Funny Car, Comp, Super Stock,
and Stock; permitted in all other categories (E.T. rules may vary by
division; contact division office). A delay box or delay device is
defined as any device (electric, electronic, pneumatic, hydraulic,
mechanical, etc.) built for the express purpose of creating a delay
between the release of transbrake line-loc, or two-step button, or
release of foot or hand brake, or release of clutch pedal/lever, or
release of any other device and the resultant action of the vehicle,
or as otherwise determined by NHRA. In categories that prohibit delay devices: Changeable vehicle
components, legal unto themselves (solenoids, throttle-linkage
components, hoses, springs, etc.), even though the removal and
replacement of that component may affect the reaction time of the
vehicle in relation to the driver action, is not considered a delay
device. 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 switches, buttons, wiring, solenoids, etc. must be for normal
automotive use; i.e., not intended to create a delay (adjustable or
non-adjustable) between release of the button and the resultant
action of 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. Two-steps or other rev limiters that are
adjustable by thumbwheel, replaceable chips, and the like may not
be within the driver’s reach and will preferably be located outside
the driver compartment.
Any system that does not fit the above description is prohibited and
must be corrected before the vehicle will be passed through preevent
technical inspection. Further, discovery of a delay device,
adjustable or non-adjustable, at any time following pre-event technical inspection will be grounds for immediate disqualification
With this rule, the use of the two step became a challenge for stick racers. From a safety standpoint, when depressing the clutch pedal, you could activate the line lock, that would be ugly when shutting down and getting on the brakes, at the finish line! So the way around, is to have micro switches on the shifter, and the clutch pedal. The only time the line lock/two step are activated is when the shifter is in 1st gear, and the clutch pedal depressed. When performing a burnout a separate switch is used to enable the line lock, as typically a burnout in a stick car is performed in 3rd gear. I probably confussed the heck out of this issue!!
Sean
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Sean Marconette
84 Mustang
5060 SS/N
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