Nitrous fuel pump wiring...

GrandSportC3 · Posted: Tue Nov 13, 2007 8:55 am Post subject: Nitrous fuel pump wiring...

I'm running a 2nd fuel pump for my nitrous fuel system. I haven't hooked it up yet as I'm not sure how I should hook it up.. I don't want the nitrous pump to be running when I'm making a naturally aspirated pass. I was thinking that I'll just activate it when the nitrous system is armed. However, I have 2 ways to activate the nitrous. One would be to have it permanently on for the entire run and temporary through a button. However, if I activate the nitrous through the button, it might be too late to kick in the nitrous fuel pump at the push of the button and that might cause a temporary lean condidtion.. Now I though of just having an extra switch that would turn on or off the nitrous pump but then I'll risk forgetting to turn it on when turning on.. What would be the best solution?

William Jones · Posted: Tue Nov 13, 2007 9:37 am Post subject:

Hook it up to your main activation switch. That way it will be on and pressurized before you activate the nitrous with your wide open throttle switch and button. That way you can turn your nitrous system on after the burnout box. When I come out of the burn out box I turn on the nos main power switch that sends power to the pump and to your button then to your WOT switch then to the selonoids. When you activate the button and you are at full throttle the Nitrous will come on. Works great for me that way

Later Bam

GrandSportC3 · Posted: Tue Nov 13, 2007 9:55 am Post subject:

William Jones · Posted: Tue Nov 13, 2007 10:29 am Post subject:

Wire the button in after the switch. That way you turn on the switch and the button cuts power to the wot switch until the button is activated. This way your pump will be on before you activate the Nitrous with the button. I would suggest you move your line lock to a different switch since it doesn't need to be activated in a hurry. I have my nitrous set up to run three ways one so that when I am on the transbrake and stage limiter the nos is not on when you release the Tbrake the stage limiter goes off and the NOS comes on and the other way is when I turn on another switch and it arms the shifter button so I can spray it if I spin when I am bracket racing and the 3rd way is to just turn on the main switch footbrake it and when you floor it the nitrous comes on. I have my car set up all three of these ways and they all are run threw the WOT switch. This doesn't limit me on what I can do with the NOS and the Nitrous fuel pump is only on when the main power for the system is on.

Later Bam

GrandSportC3 · Posted: Tue Nov 13, 2007 12:13 pm Post subject:

10sec.et · Posted: Tue Nov 13, 2007 1:03 pm Post subject:

why not use the horn button?

GrandSportC3 · Posted: Tue Nov 13, 2007 1:07 pm Post subject:

William Jones · Posted: Tue Nov 13, 2007 1:33 pm Post subject:

My linelock button is on the steering wheel spoke so I can hold it while holding the steering wheel and have my other hand on the shifter. It scares me to think that you could forget to start the pump and the nitous still come on do you have a fuel pressure switch wired up to shut the Nos off if the fuel pressure drops? If so that will keep the Nitrous from activating without the fuel pump on.

Later Bam

GrandSportC3 · Posted: Tue Nov 13, 2007 3:01 pm Post subject:

William Jones · Posted: Tue Nov 13, 2007 3:59 pm Post subject:

No I have one of those flexible cable made by Hurst I believe it is zip tied to the column with some slack left in it so you can turn the wheel completly. I think it cost $20 from jegs or summit. works good. My steering wheel has flat steel spokes I drilled a hole in it and mounted it there. But the also make mounts the go around the wheel its self and will hold a switch.

You can see my button in the interior pics posted in the garage and get an idea of what I am talking about.

Later Bam

wagon train · Posted: Tue Nov 13, 2007 7:51 pm Post subject:

GrandSportC3 · Posted: Tue Nov 13, 2007 8:13 pm Post subject:

Big Dave · Posted: Wed Nov 14, 2007 9:36 pm Post subject:

I would run both pumps all the time just use a recalculating circuit for the NOS as well as the main pump so that all of the fuel is sitting pressurized and ready to go the second the gas solenoid opens (just like the nitrous is after a purge with an open bottle).

Big Dave

GrandSportC3 · Posted: Wed Nov 14, 2007 11:22 pm Post subject: