Brake Pressure Switch for launch control ???

[Rich Biebel]

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.....

[Mike Merk]

Originally Posted by Rich Biebel

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.....

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.

[Rich Biebel]

Originally Posted by Mike Merk

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.

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

[Eman]

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.

[Mike Merk]

Originally Posted by Rich Biebel

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

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.

[JP1738]

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

[Doug Hoven]

Originally Posted by JP1738

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

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.

[Rich Biebel]

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...

[GallopinGhost]

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

Originally Posted by Rich Biebel

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.....

[Rich Biebel]

Originally Posted by GallopinGhost

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

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....