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-   -   2 step off brake pressure switch ? (https://classracer.com/classforum/showthread.php?t=72240)

Dave Turner 02-16-2019 11:29 AM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by black88coupe (Post 582658)
Im referring to the hydraulic pressure in the brake line taking longer to release the switch when you take your foot off the pedal. How would that action be equal too or faster than using say a transbrake switch on your shifter? The action from using a transbrake switch seems like it would be much quicker. Is there something im missing here? Thanks
The shifter mounted switch won’t pass tech in Stock.

black88coupe 02-16-2019 11:30 AM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by Dave Turner (Post 582662)
The shifter mounted switch won’t pass tech in Stock.
Gotcha! Thanks

Tom Goldman 02-16-2019 11:35 AM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by Coleydog (Post 582644)
Just thinkng out loud, why would activating a two-step at the finish line be a problem? You have already let off the gas and most race converters stall at 4500 and above so if the 2-step activates at say 3500, wouldn't the engine just freewheel?
Besides on another note, if your shifter allows going to reverse by accident at the finish line, you need a better shifter. My hand is on the handle ready to neutral before the line, then I brake.
Mike
It isn't normal slowing that's an issue. ...It's a problem because if you stab the brakes at the stripe to tighten it up or give it back , the 2 step instantly pulling the engine to 3 or 4000 rpm is akin to using a Jake brake on a diesel truck .
Especially on a car with steep rear gears .

Dave Muller 02-16-2019 01:59 PM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by GTX JOHN (Post 582597)
Our switches are set pretty high and not very much chance
that we will hit the two step when braking unless we go totally
crazy on the brakes.
That's what I did too, I don't think I've come close to activating at the top end yet. But I do have a switch already installed, and putting it inline with power to the pressure switch is a good idea. I might try that some time. I put that switch in before I encountered the "unbroken wire" rule and never hooked it up.

Mark Yacavone 02-16-2019 02:23 PM
Re: 2 step off brake pressure switch ?
 
I'm sure I've posted this before.
Release was in the brake pedal.The system only worked with the shifter in low gear .
Not possible to leave off the micro switch in low.
I suppose someone could try to pull a fast one and leave in 2nd with an auto upshift deal.
Still would be kind of awkward to use the switch (and the pedal button) on the line.
I never had a problem..No. 1 Q, record holder, etc.

https://i.postimg.cc/85jdX0xC/100-2227xzx.jpg

https://i.postimg.cc/yYPJ9Trp/100-2226.jpg

Mark Yacavone 02-16-2019 02:25 PM
Re: 2 step off brake pressure switch ?
 
You don't want the limiter coming on at the finish line..even accidentally .
You can get the boot for that.

Coleydog 02-16-2019 03:56 PM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by Tom Goldman (Post 582664)
It isn't normal slowing that's an issue. ...It's a problem because if you stab the brakes at the stripe to tighten it up or give it back , the 2 step instantly pulling the engine to 3 or 4000 rpm is akin to using a Jake brake on a diesel truck .
Especially on a car with steep rear gears .
I had a very loose converter that allowed the engine to flutter at 7000 on the rev limiter, (drive shaft was 5600) it just drops ignition on various cylinders, not closing off the exhaust like a jack brake. I'll try it out this spring to see what happens, intriguing. some type of cut out switch would be the best.

Eman 02-18-2019 12:52 AM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by black88coupe (Post 582658)
Im referring to the hydraulic pressure in the brake line taking longer to release the switch when you take your foot off the pedal. How would that action be equal too or faster than using say a transbrake switch on your shifter? The action from using a transbrake switch seems like it would be much quicker. Is there something im missing here? Thanks
Probably is, but if you're not allowed a transbrake this is a way to leave at the same RPM every time footbraking.
I tend to scrub the brakes before the stripe to tighten it up, doing this with my foot on the throttle. If I didn't have a way to shut the 2 step off it would stutter at the top end. I have a switch that controls the power to the brake pressure switch and a small LED on the dash to show when the brake pressure activates the 2 step so I know I'm on the brake hard enough at the starting line.
I've thought about using a high gear pressure switch on the trans that would open the power circuit in high gear.

black88coupe 02-18-2019 07:54 AM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by Eman (Post 582808)
Probably is, but if you're not allowed a transbrake this is a way to leave at the same RPM every time footbraking.
I tend to scrub the brakes before the stripe to tighten it up, doing this with my foot on the throttle. If I didn't have a way to shut the 2 step off it would stutter at the top end. I have a switch that controls the power to the brake pressure switch and a small LED on the dash to show when the brake pressure activates the 2 step so I know I'm on the brake hard enough at the starting line.
I've thought about using a high gear pressure switch on the trans that would open the power circuit in high gear.
Sounds pretty ingenious.

Dave Muller 02-18-2019 11:03 AM
Re: 2 step off brake pressure switch ?
 
Quote:
Originally Posted by Eman (Post 582808)
Probably is, but if you're not allowed a transbrake this is a way to leave at the same RPM every time footbraking.
I tend to scrub the brakes before the stripe to tighten it up, doing this with my foot on the throttle. If I didn't have a way to shut the 2 step off it would stutter at the top end. I have a switch that controls the power to the brake pressure switch and a small LED on the dash to show when the brake pressure activates the 2 step so I know I'm on the brake hard enough at the starting line.
I've thought about using a high gear pressure switch on the trans that would open the power circuit in high gear.
And there I thought I was the only one to use an LED like that!


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