2 step pressure switch question
 

For a pressure switch for the two step activation...do you prefer an adjustable or a fixed pressure switch? Any operational difference between a 1/8 or 1/4 NPT?

Thanks! -Al

Re: 2 step pressure switch question
 

I don't know what kind of car, but I have had no problem using the original brake light switch.

Re: 2 step pressure switch question
 

I installed an adjustable one. I wired in a LED light that's activated when the 2 step is power up. You as well will need to wire in a way to power off the pressure switch circuit after launching the car. A micro switch off the shifter in high gear or a on/off switch, (or both) will work.

Steve STK. 6380

Re: 2 step pressure switch question
 

I used a standard non adjustable switch from local auto parts, I know Jegs sells a similar one. Mine is 1/8" pipe and threads right into my line lock solenoid, it has multiple ports. I also have a small LED on the dash to indicate the 2 step is activated. I use a transbrake button style switch on my steering wheel to activate the circuit. When I stage my thumb is on the button and when I step on the brake the LED comes on and the 2 step is activated. Release the brake pedal and the 2 step is off. I take my thumb off of the steering wheel button after launch and I can scrub the brake at throttle and not stutter.

Re: 2 step pressure switch question
 

Once you have your 2 step activated wouldn’t your car take off if you released the button on the steering wheel? Don’t think buttons on the steering wheels that can be used to control the launch are legal.

Re: 2 step pressure switch question
 

I should have said I bracket race only in no-box, not a class racer. If you're going to run a brake pressure 2 step and drive the stripe at all with the brake pedal you will need a shutoff switch. I use the pushbutton as it's simpler for me to turn it on and shut it off. I had a toggle switch and in the 1/8th mi. I would forget to shut it off down track so if I scrubbed the brake it would stutter.
To answer your question if I released the button on the wheel the 2 step would release and I would be full throttle on the foot brake so yes it would try to launch as I couldn't hold it on the line at full throttle. I don't have to remove my finger to launch, it controls the power to the brake pressure switch which in turn controls the 2 step.
I use it to level the playing field for me as I'm foot braking in no-box.

Re: 2 step pressure switch question
 

Al,
I use a non adjustable 250 psi. pressure switch. I like the lower pressure because I don’t have to push so hard on the pedal to activate. I find that more consistent. I have a micro switch on the first gear detent so it only works in first gear. I also have an on off switch I activate after the burnout that turns on the 2 step and datalogger.

Re: 2 step pressure switch question
 

Mine is adjustable. To keep the car staged with all six barrels open it takes a lot of line pressure. I have never had the two step activate during brakeing.

Re: 2 step pressure switch question
 

Rulebook clearly states "a hand release is prohibited".

I recommend the low gear micro-switch.

Re: 2 step pressure switch question
 

Larry, where did you get your adjustable pressure switch?

Re: 2 step pressure switch question
 

When I went to Super Stock, with a trans brake, mine is enabled with my Trans Brake button. Brakes at the finish line has no effect.

When I was foot braking, I had a spring loaded-to-off toggle switch on my shifter, that was "On" only when the lever was in low gear. I used brake light switch on the pedal, up under the dash on these F body cars, to energize the 2 step. Very trouble free deal.

Re: 2 step pressure switch question
 

When I had a two step in Stock, we used a MSD Window Switch for activation and at the end, there was no function. You only have to put the brakes on once at the top end and have the two step come on to figure something out.

Re: 2 step pressure switch question
 

Harrington button in place of brake light switch. Adjust it far enough that you have to be on the brakes really hard to trigger it

Re: 2 step pressure switch question
 

The factory brake light switch on F body GM cars like mine are also adjustable, a tad over an inch of adjustability.

Re: 2 step pressure switch question
 

Whitman controls makes good adjustable
switches!

Re: 2 step pressure switch question
 

Would anyone be willing to tell me exactly which in line brake switch they use? There are so many options I am completely confused. I need to get one ordered ASAP. PM me if you don't want the world to know.

Re: 2 step pressure switch question
 

Robbie, check your PM's. -Al

Re: 2 step pressure switch question
 

Thank you for all your help Alan, Got my switch ordered.

Re: 2 step pressure switch question
 

I have a few questions, do you feel the two step helps 1- your ETs 2- your relaction times 3- your launch or just its less trouble maintaining a certain launch rpm? Is it more critical with a short stroke engine than a bigger one.
Mike

Re: 2 step pressure switch question
 

2 and 3 for me. Only used on the stock stroke 355SBC I run so I can't comment on other engines. I feel it makes RT's better and more consistent because of set RPM and one less thing to think about.




https://www.jegs.com/i/JEGS/555/63070/10002/-1
This basically the switch I use, mine is a Borg Warner from local parts store.

Re: 2 step pressure switch question
 

Re: 2 step pressure switch question
 

A lot of guys are using a double adjustable pressure switch. They're easily identifiable just buy looking at them. It allows you to set the two step pressure to come on, then using a lower pressure for the release. You can actually slightly adjust a "time-delay" to help with your reaction times, A little testing, and you'll really like it …..

Re: 2 step pressure switch question
 

Ok who makes this?

Re: 2 step pressure switch question
 

This is just like the folk race cars “the answer” only cheaper.