Brake Pressure Switch for launch control ???
 

I have a new stocker that has a brake pressure switch for launch control and I am trying to understand how it works and how to set it properly? I am just an old 2 step switch kind of guy (and am easily confused).

Any help is greatly appreciated!

Text or call six03-78five-seven866
email: deanribeiro@comcast.net

Re: Brake Pressure Switch for launch control ???
 

Look up Folk race cars. They have one worked really well. They are in Illinois last i heard.

Re: Brake Pressure Switch for launch control ???
 

here is one.Does it look close?

Paul H

Re: Brake Pressure Switch for launch control ???
 

Folk Race cars closed. The switch you want has an adjustable pressure Range 100 to 1000 PSI. 3 wires. Black wire is not used.
Recommend wiring power to it thru a 3rd gear micro switch.
Power is removed to the BPS when in 3rd gear ( if a 3sp Auto)
This will allow you to apply brakes at 1,000 and the 2 step will not be activated.
Set up a LED light in the circuit so you know when the 2 step is powered up with right brake PSI
Believe they are 200.00 or so.

Steve Teeter Stk/SS 620

Re: Brake Pressure Switch for launch control ???
 

The pressure switch is adjusted to close a set of electrical tips . When the brake pressure is reached voltage is pass to the 2 step device . Usually
There is toggle switch to select between 2 step and 3 step for the water burn out

Re: Brake Pressure Switch for launch control ???
 

PSW-190. Viton .

Re: Brake Pressure Switch for launch control ???
 

Has anyone done this with Precision Shifter forward pattern? Can someone send me a pic or point me to a good reliable microswitch and mount? Thanks!

https://precisionperformance.com/wp-...17/04/406b.jpg

Re: Brake Pressure Switch for launch control ???
 

Does the car have a 2 step or a 3 step? No matter the brake pressure switch should send power to the rev control when you reach the pressure setting of the switch. Power to the switch could possibly be controlled by a high gear switch on the shifter or in the transmission so the pressure switch loses power in high gear and cannot activate the 2 step if you brake driving the stripe. If the switch is adjustable you just need to set it for the brake pressure you stage with. I wired mine with a small LED so I know when power is going to the rev control as I don't have a brake pressure gauge.

Re: Brake Pressure Switch for launch control ???
 

I did that to my PP shifter Bobby, only activates in first gear. I mounted to the right side. I?ll take pics when I get home. Same brake switch too..

Re: Brake Pressure Switch for launch control ???
 

Thanks Barry! You can PM me or email me bobby.fazio@gmail.com.

Re: Brake Pressure Switch for launch control ???
 

There should be a micro switch that PPP can supply that mounts opposite side of the Netural safety switch. It's triggered by the same rod. No external bracket and switch required then . Very clean and they provide a screw on connector wiring harness same as the Safety switch hasness .

Re: Brake Pressure Switch for launch control ???
 

Just curious how much brake pressure do you use at the starting line? I have seen a lot of data and have never seen brake pressure over 4-500 psi (on 160 mph plus cars). I would think anymore than that would lock em up bad at the stripe.....

Re: Brake Pressure Switch for launch control ???
 

Set @ 800 and release @ 200 generally on our stuff.
120/125 MPH Stockers.

Re: Brake Pressure Switch for launch control ???
 

Pics and video sent Bobby..

Re: Brake Pressure Switch for launch control ???
 

Anyone hook up this setup using a Turbo Action Cheetah with a reverse pattern 3 speed trans ?

I'd like to try it and making a switch to only work in low gear looks like a challenge.....

Re: Brake Pressure Switch for launch control ???
 

I haven't done it with a reverse pattern but I think it could be done fairly easily by mounting a momentary, lever micro switch on a bracket attached at the trans pan rail or in tandem with the shift cable bracket. Switches like these are available in short or long arm for less than $20. Should be able to activate when the shift lever arm is in low gear only.

Re: Brake Pressure Switch for launch control ???
 

Easy to do. I use a neutral start switch I got from turbo action.

Re: Brake Pressure Switch for launch control ???
 

Thanks, that is a great solution. I didn't know if it would work

I'm an old pure foot breaker but always open to trying something different.

When I owned this car in 2006 I did install a 2 step button switch and low rpm adjustable chip but never used it.

It was not comfortable to me leaning hard on the brake pedal and using that hand operated button.

Using the brake pedal with a pressure switch sounds more appealing

I have taken the shifter apart at least 4 times to do various things.....one more time can't hurt....

Re: Brake Pressure Switch for launch control ???
 

The problem with that on a reverse pattern is the shifter or lever is moving toward the switch as you upshift. The switch would also be in the way going back to N-R-P

I've made switches like that on other cars but the shift pattern was forward.

I'm sure it can be done but it takes some thought and fabrication

The built in neutral start switch posted above is a good solution

Re: Brake Pressure Switch for launch control ???
 

If you're just bracket racing and not class racing I did it an easy way. I put a trans brake button on the steering wheel. If I put my thumb on the button it would energize the circuit for the brake pressure switch. After launch I just moved my thumb. On 3 speed GM transmission you can use a pressure switch on the transmission pressure port.

Re: Brake Pressure Switch for launch control ???
 

With the switches I posted a picture of, I was thinking of mounting it between the pan & shifter lever, letting the inside face of the arm touch the roller on the switch lever. In this arrangement, it would only contact in low gear & wouldn't affect the lever's range of motion either direction.

I just have a push button on the back of my Cheetah shifter & the shifter contacts it in low gear (forward pattern), activating the brake pressure switch.

Re: Brake Pressure Switch for launch control ???
 

Slightly off topic here, but is it legal to use a momentary switch that's not mounted directly to the brake pedal that you hit with your foot? Like a WOT switch on the back side of the pedal that makes contact when the pedal is depressed a certain amount? I could go through the rule book and check myself but I'm lazy and I don't want to. TIA

Re: Brake Pressure Switch for launch control ???
 

I believe something like that would be legal. That?s how a lot of clutch guys activate the 2 step, with a momentary switch, sometimes mounted to the pedal, other times activated by the Z bar, or back of the pedal. What I don?t think is legal, is having a button to activate your circuit for your 2 step. Not that tech is really a thing anymore, but NHRA didn?t like that in theory, you could also deactivate the 2 step with the same button, and in Stock you aren?t allowed to launch off of a switch or button activated by hand.
Now, I?m not sure if I?m just ignorant, oblivious, etc, but I don?t understand the issue of having a brake pressure switch active during the run. My 2 step is activated at 600psi. More than likely, if you?re using more than 5-600psi on a run, you are probably not going to be under power, and probably close to locking up the front brakes. To the best of my knowledge, if engine rpm is above the 2 step rpm, ignition will be cut completely.

Re: Brake Pressure Switch for launch control ???
 

Makes sense about the brake pressure switch being active down track and not triggering the 2 step because you're not applying enough pressure to trigger it....

The info I've gathered here has helped Thanks...

Re: Brake Pressure Switch for launch control ???
 

If you don't have some way to deactivate the brake pressure switch down track in theory it could activate the 2 step when you do any hard braking.( dumping, hard backing into, ect) Depending on when, where, and how you hit the brakes that activated the 2 step it could be said you were activating a down track stutter device. I would hate to have that discussion with NHRA Tech. Some sort of deactivation switch is the route that might be all around the best and safest.
.02 for free