Ok, just for some background info, i'm running a Hitman+ wet kit (150 jets). I have a FPSS, a WOT switch and a window switch. I run a MSD digital 6+ ingition, 6* retard with the n20 armed.

Now onto the question. When i launch NA, i use the 2 step rev limiter built into the digital 6. I have it set at 4500 rpm. I hold the button down, floor it dump the clutch and let go of button. Launches great, and its pretty consistant. But i wanna launch off the 2 step with nitrous. If i do it as is, the nitrous would be engaged and spraying while still at the tree with the 2 step activated, which i don't want to happen. I want the n20 to hit as soon as my foot comes off the clutch. I've decided the best way to do this is with a switch on the clutch.

Now to do this, i'd be putting a normally closed push button spring loaded type switch on the firewall, and mounting it so that the clutch pedal just hits it when it's down. I don't usually touch the clutch during shifts, so after the launch it won't be doing anything, i've got the window switch to handle disarming for shifts.

Does this idea seem like it would work? i cant see how it wouldn't. My biggest question would be were to get the switch. I looked at work (western auto... basically an Advanced/autozone deal) but couldn't find anything switches that were normally closed, and only opened with the button depressed.

Any help would be appreciated

Eric

 

i would do it the oppisate way. like the cruise switch has it.



the switch is pushed in when the clutch is all the way up..... but as soon as you clutch, it'll cut off...


also, that method would let the clutch fully engage before the spray hit... probly make the clutch last longer.


theres a flat pad on the pedal arm ment to hit switches anyway, so it should be easy to hookup.

 

why dont you wire the activation through the two step switch so when you let go of it it arms the NOS too.
that seems easier than rigging a seperate switch.

 

i cant think of anyway to do that. The switch for the 2 step is a normally open push button switch. 12volts only runs through it when the button is depressed. This activates the 2 step circuit.

If i could find a double pole single throw switch(or is that the other way around...don't remember), that closes one circuit and opens another when the button is depressed, then that would work perfect

Unfortunatly i have no idea where to find such a switch. If anyone could lead to a place that sells them, i'd greatly appreciate it.

Eric

 

im sure radio smack would have that

 

good thinkin, i'll have to check that out tomorrow.

Eric

 

no prob, if they dont have what you want you might just get a NC pushbutton and put it alongside the other one so you can release them at the same time.

 

uhh, or you could keep the switch you have and use a relay.

 

how would you use an open circuit to close a relay
the double switch is an easy fix

 

when the switch closes, it pops the relay over and disconnects whatever..



a relay can be used to make a logical NOT as well as a AND and OR.

 

relay logic must be before my time

 

Relays Will Do What he is wanting to do.

You can make a positive wire put out a negitave Out Put With Relays Just need to Do a little Research.

Learn Relays because

1. it keeps you from having long Thick Guage Wire Runs.
2. It Makes Toggle switch just a switch of finish a connection and the power runs through the relay.(no more Burned up Switches.)
3. Cleaner Apperance
4. Better SAFTEY (no Wire Fires.)

For those who want to research more info on realys go to http://www.the12volt.com
They also have great Forums and there is one whole forum just for Relays.

 

thank you so much for that link...

looks like all i need is a SPDT 30 amp relay to do the job.

Just to make sure i'm clear, i'd have the common 12 volt hot at all times, one side of the coil is grounded, the other goes to switched 12v. The center post is normally closed so it will go to the nitrous circuit, the the outer post goes to the 2 step since its normally open. Sound good?

Only other thing i'm not entirely clear on is where to insert it in the nitrous system. I'm thinking on the ground side after the solenoids. This will make it so the ground path for the soleniods will open when i push the switch, thereby opening the circuit, and disengaging the nitrous?

Correct?
Eric

 

I think That is correct. I will Research later.Please Refer to you connections buy the corosponding Numbers on this diagram


and Register on the12Volt.com and go to the relay forums and ask their, Someone there will be able to answer Quicker. For it has been about 6 years since I was a Electronics installer and Cant Quite Remember. I think You Might Need To use 2 Relays. Don't quote me on that though.

 

ok, 30 is hot at all times, 87A goes to the nitrous, 87 goes to the 2 step. 86 goes to switched 12volts, 85 is ground.

Can't see why i would need two relays for this, one should do perfectly.

Eric

 

OK Here Is How To Do It

The Image is With a Master Disconnect Off. Sorta like a Arming SWitch that Cuts All Power.


This Image Is With the Master Disconnect On and the switch Is in the Open.


This Image Is with the master Disconnect on and The switch is in the Closed.


You know sometimes I amaze My Self :hail:

Hope This Helps.

 

pics arent showing up for me

Eric

 

When you get it running like that, let us know how well the car hooks.

Most of my friends don't spray out of the hole, they'll start to spray at the 60' mark.

 

My Pic hosting site is temporialy down i will upload to my site tomorror afternoon. They show exactly how to do what You want zupmanZ28.

 

off a timer or progressive controler or what?

 

yep they work now.

It should hook up pretty good. The car pretty much dead hooks on a 4k clutch drop NA, and thats with 18 psi in the ET drags. I Plan to drop it down to 10psi or so and launch at 4500.

Should be one hell of a ride

Eric

 

Usually with a hand controlled button, since most fast cars run an Auto with a Stall.
I was telling a friend with a manual to rig up a delay timer set for about 1.6 seconds since that is what he averages on the 60' time.

 

3 words, Got 12 Bolt?

 

umm, even with a auto you can run a progressive or timed controller.

the way i would do it is for the timer to start the instant you release the transbrake or line lock. (or if you dont have thoes, then WOT. i doubt they bring up the converter with WOT if they dont have a transbrake.....)

 

Usually with a trans brake, you will use a 2 stage limiter, that way you can be at 4K while sitting on the line.
Have the pedal to the floor, rpms at 4K, release trans brake rpms shoot up and off you go.
If you ever seen the Pain Video, it has an in car camera so you can ride in a nice 9sec f-body. As soon as he launches, all you see is the sky.

 

so you just have the system so that until the trans break is released AND the gas is on the floor, the timer doesnt start for the nitrous.

so he launches off the bottle, gets out the 1.7 seconds or whatever, then the nitrous hits.

 

9" with a locker

Eric

 

That works much better.

 

Thats 4 words

 

five if you read it as nine inch

 

It looks like you're going another route, but if you still wanted clutch switchs I would just look in a junkyard for a manual with cruise. At least in my car, there is one button that is pushed when the clutch is all the way down (so you have to mash the clutch to start the car) and another that is held in while the clutch is fully released (to kill the cruise control if you mash the clutch). You could probably just grab the buttons and brackets from one of these cars if you wanted to hook up some wiring to your clutch.

 

yeah thats what i was thinking about working with before the relay idea came about. But i've already got all the parts i need to make the relay work, and it should make for some superconsistant badass launches too

Eric