Well, thought i would post up my nitrous activation setup. I have it hooked up with a button (no full throttle activation). I used my horn as the actual button to spray the nitrous...but I hooked it up so it would function as the horn as well. This way you have the best of both worlds. When the main nitrous activation switch is off, the horn will function like normal. When the switch is on, the horn buttons become the trigger for the solenoid(s). You could use a separate toggle switch to switch back and forth from horn to nitrous trigger if you wanted to, but i chose to hook up 2 relays, to eliminate the extra toggle switch.

The first relay: used to interrupt the horn wire and the second relay is used to trigger the solenoid(s). I have a wiring diagram below how you can hook this up, but i'll explain it as well. the horn wire from your steering wheel button to the horn is a negative pulse (ground) when hit. You use a 12v wire coming from the main activation switch to power the first relay (i used #86 terminal for the switched 12v wire and used #85 for ground). When you activate the main switch, the connection from relay#30 terminal (steering wheel button) is interrupted from the #87 terminal (wire to horn) and #30 is then connected to #87 which is the negative (ground) trigger for the second relay. So when you hit the horn, now the negative pulse will go to the #87 terminal.

The second relay: Terminals #86 and #30 are hooked up to 12v constant. I hooked the negative (ground) pulse wire coming from the first relay #87 terminal to the second relay terminal #85 (so this negative pulse wire will trigger the second relay only when the horn button is pressed.) Then i ran a wire from the #87 terminal to the nitrous solenoid. i used 12v + to trigger the solenoid and grounded the other side. you could do the opposite and hook up one side of the solenoid to 12v constant and then have the #30 terminal on the second relay hooked up to ground instead but this is how i hooked it up.

Well hope someone could find this useful. I love showing people how it works in my car. A lot of people are surprised at how it works. Well anyway if you have any questions let me know.

Ryan

 

That's the beauty of relays...good job!

 

Don't you need the horn when your using the nitrous lol


So you have to hold down the button while spraying, then when you let off the nitrous is off.

I want to wire mine up so i can press it, release right away and have the nitrous stay on then have the WOT switch shut is down when i let off at the 1320 mark. I can't seem to figure out how it can be done with a momentary switch. Maybe it can't, but i figure anything is possible.

 

They sell latching and timed relays...you could activate one of them with the horn, and have it in series with the WOT switch. Most stereo/alarm install shops have them...they're typically used for amp racks and motorization projects.

 

I never even thought of that. Thanks

 

I've been sketching a few ideas and I also think you could do it with a few relays. You might be able to do the latching by connecting 86 to 12v, 87 to ground, 30 and 85 together AND to the horn (assuming it's a ground trigger). This way, when the horn is activated (it'll beep of course), the relay latches and keeps itself on. Another relay could interrupt the 12v line on 86 when you release the WOT switch...that would disable the first relay and end the cycle. Then you'd have to incorporate the horn/nitrous function with yet a 3rd relay so the horn doesn't drive you crazy! I think it's doable...but of course it'd require a bit of testing and YMMV! Also, the more complex you make it, the harder it is to troubleshoot and the more likely it is to fail. I prefer to keep nitrous systems simple myself...far less to go wrong!

 

You should leave the horn activated...it would be kinda funny to see someone go down the track honking their horn.

 

Yea, very true the more complex the more to go wrong.

One thing that simplifies it is I have an aftermarket steering wheel and the nitrous button is seperate from horn button. The thing is though I'm not sure how I would turn the relay off. A latch relay stays in the same position unless you run current through the other way or press the reset button. At least that's the way i understand it. I could be way off.

So what would be the best way to reset the relay??

 

Like this...

 

I guess i just can't visualize it. I suck at seeing relays. I have no idea the terminal numbers--they draw the pic on top just for me I'm going to try to draw something out. Maybe post it up and you guys can correct where i go wrong.

 

Momentary to Constant near the top. Is this what you mean (2nd one).

http://www.the12volt.com/relays/page5.asp#oifo

 

This would be really hard to do with an M6 right...and i dont know about you guys but mine horn is hard to activate when i push it....maybe different for you guys....i just put mine right on the thumb side of my t-handle

 

Exactly! That's an awesome site. I wish I'd of thought to do a search before I spent 30 minutes playing with different ideas...LOL! Good find, that'll come in handy I'm sure!

 

Good job man. I always wanted to use the steering wheel buttons for this purpose, but yet to have purchased n2o.

 

Yea, i've been to that site a few times, helps a lot on some fancy wiring.