Two Step Brake Pedal Solutions?

[Cdncarnut]

I run a turbo 350 and made up a bracket to mount a micro switch on my shifter, which is only closed when the shifter is in first gear.

It is wired in series with the push button switch, installed on my brake pedal.

The two step is activated only when the push button switch and the micro switch are closed.

Works like a charm.

[Robert Simpson]

Thomas can you post or send me a picture of how you mounted your switch on the shifter?

Thanks

Robert

[FireSale]

Just to clarify things, the rule book states that starting line stuff like line lock and trans brake must have only one switch in the circuit. A rough quote goes like this:

"One wire from a power source to a switch and on to the activated solenoid,"

power->trigger switch->solenoid. (They seem to forget the ground wire).

I have what I call "circuit power" switches for both my line lock and trans brake on the dash in aircraft covers so I can bat at them and kill the power to those devices at any time. I would just hate to bump my TB button during a run.

I consider these additional switches safety devices.

Dale

[Cdncarnut]

From the 2016 Rule Book, in the in Section 10 Stock Cars

IGNITION, Automatic
Two-step permitted. Two-step must be foot-activated through
brake pedal, clutch pedal, or pressure switch. Hand release
prohibited. All wiring associated with the ignition system must be
fully visible, labeled, and traceable. See General Regulations 8:3.

And, from the General Regulations

.
8:3 IGNITION
Each car in competition must have a positive-action on/off switch,
capable of de-energizing the entire ignition system, in good
working order, located within easy reach of the driver.
“Momentary contact” switch prohibited. Magneto “kill button”-type
switches are prohibited.
All ignition systems and/or components wiring harnesses and
attachments must utilize those supplied by the ignition system
manufacturer. The wiring harness must be used in an unaltered
manner consistent with the manufacturer’s installation and
instruction books. All wiring associated with the ignition system
must be fully visible, labeled, and traceable.
All removable or pin-type timing devices are prohibited. 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.
The use of any programmable multi-point rev limiter and/or a
rate-of-acceleration rpm limiter, either by themselves (e.g., MSD
7561 , MSD 7761 ) or integrated into the ignition system (e.g.,
MSD 7531 ), is prohibited in NHRA competition.

From all I read there, you are good to go with the micro switch on the shifter.

[Cdncarnut]

Originally Posted by Robert Simpson

Thomas can you post or send me a picture of how you mounted your switch on the shifter?

Thanks

Robert

Robert,
You have a PM.

[FireSale]

Originally Posted by Cdncarnut

From the 2016 Rule Book, in the in Section 10 Stock Cars

IGNITION, Automatic
Two-step permitted. Two-step must be foot-activated through
brake pedal, clutch pedal, or pressure switch. Hand release
prohibited. All wiring associated with the ignition system must be
fully visible, labeled, and traceable. See General Regulations 8:3.

And, from the General Regulations

.
8:3 IGNITION
Each car in competition must have a positive-action on/off switch,
capable of de-energizing the entire ignition system, in good
working order, located within easy reach of the driver.
“Momentary contact” switch prohibited. Magneto “kill button”-type
switches are prohibited.
All ignition systems and/or components wiring harnesses and
attachments must utilize those supplied by the ignition system
manufacturer. The wiring harness must be used in an unaltered
manner consistent with the manufacturer’s installation and
instruction books. All wiring associated with the ignition system
must be fully visible, labeled, and traceable.
All removable or pin-type timing devices are prohibited. 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.
The use of any programmable multi-point rev limiter and/or a
rate-of-acceleration rpm limiter, either by themselves (e.g., MSD
7561 , MSD 7761 ) or integrated into the ignition system (e.g.,
MSD 7531 ), is prohibited in NHRA competition.

From all I read there, you are good to go with the micro switch on the shifter.

Electrical stuff is scattered throughout the book. This is what I found in General: 20.
ELECTRICAL/CONTROL: 8
8:2 DELAY BOXES/DEVICES

note: This is several paragraphs down)

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."

Not really sure this would apply to a two-step in a stick car because you are regulating the engine rpm, not the brake or trans circuit.

Dale

[Cdncarnut]

Dale,

The first line of this section, in General Regulations, makes this a non-issue for a Stock Eliminator car or any of the other classes listed.

8:2 DELAY BOXES/DEVICES
Prohibited in Top Fuel, Funny Car, Pro Stock, Pro Stock
Motorcycle, Top Alcohol Dragster, Top Alcohol Funny Car, Pro Mod,
Comp, Super Stock, and Stock;

I have a well known Super Stock racer, who helped me get my set up for last season, as I too was stumped as to what to as far as disabling the launch control at the top end.
He was impressed with what I finally came up with and it works like a charm.

[Robert Simpson]

Originally Posted by Cdncarnut

Robert,
You have a PM.

Got it thank you Thomas.

[ron mattson]

Whitman controls adjustable pressure switch!

[Maxie fury 64]

When you guys add a pressure guage to the system say inside the car for staging purposes. Is it necessary to add a bleeder at the guage? Or will just bleeding the brakes take care of this added brake line? Getting ready to add a guage and pressure switch for my two step and am curious. Thx fellas