Wiring without relay?

[BobDoLe]

Here's where I am now with my new Harris Speed Works dry kit...

I had installed the whole system by the book. At first, there was one minor problem; my relay was damaged. The plastic casing around the guts of the relay was cracked and fell apart so I carefully put it back together thinking it would be okay (mistake).

The micro WOT switch was mounted under the gas pedal with a zip tie in a manner I borrowed from this forum (thank you for the idea).

So I got the bottle filled (REMEMBER TO USE TEFLON TAPE OR PASTE WHEN YOU HOOK UP YoUR CONNECTIONS!!!!!!) and had it mounted between the back seats of my 2001 convertible. From there I could easily access the bottle valve. The thing is mounted to the carpet and seems very secure even during violent cornering.

When I finally got the chance to test the thing, I must have mashed my foot to the floor too hard as I jammed the switched into the ON position (no more clickety-click sound/feel). Luckily, the relay failed on me and the juice cut off before I had a chance to back off the accelerator. :banana: .

It was late at night and my bottle was only at 800 psi (remember this is a dry kit), but the kick in acceleration, however short lived, was very enjoyable.



This brings me back to the drawing board.

I picked up a custom arming switch plate from HSW and I have no micro WOT or working relay harness. I know it is potentially dangerous to use nitrous without the WOT switch, but can't a person just train themselves to deactivate the armed system before letting off the gas?

I am thinking of wiring the system without the relay. I found an example of how this is done on the nitrousdirect website...


What I would do is to have the solenoid connected to ground in the engine bay, then have a power wire running through the arming switch plate and then into the engine bay to the solenoid. When the arming switch plate completes the current, the solenoid releases the nitrous.

The way I plan on setting up the switch plate is to have it so a switch has to be flipped before the push-button will be allowed to complete the current to the solenoid.

I think this will give me more direct control over the system. I can install another switch that will have to be activated for redundancy as I would not want anyone else to be playing with my nitrous setup.

Of course I still have to find out if the switch plate is going to be able to handle the juice required to work the solenoid...
How does this sound?

[Shodown]

Re: Wiring without relay?

I wouldnt suggest running without a WOT switch, you are asking for unecessary trouble. Be patient and get a new switch, they are only a few dollars.

As for the relay, you can get them from HSW or any local speed shop that carries nitrous accessories. They are typically like $10 for the relay and harness.

[usd2sing]

Re: Wiring without relay?

take out your under pedal wot switch, go to radio shack with it in your hand for comparison. replacement is $4.

had to do this on 3 diff cars....thier cheap and replacable.
good luck

[lilchubby]

Re: Wiring without relay?

i have it ran just like u are talking about. soleniold grounded. power from battery to toggle switch....from toggle switch to push button...from push button back to soleniod. it works great. i have had no problem with over revving. i have a hand held trans brake push button that i hold in my hand along with the shifter. i love the set up and see no problem with u doing it. if u were to do it i would try it the first coouple of times spraying only from like 3000 to like 4500 to stay safe. then once u get the fell of it spray it all the way up around 5k. hope this helps and if u have any questions just ask, i will try and help any way i can.

[BobDoLe]

Re: Wiring without relay?

HSW is nice enough to send me a new relay. I'll be using it when it comes in the mail because I don't want any electrical problems (burning up switches that can't handle the solenoid draw).

As far as triggering the system, I am giving up on the WOT micro switch for now, but I will visit RadioShack to see what they have.

Here's my concern... my car is an A4. If i start spraying in first gear at about 3,000RPM, what happens when the automatic transmission shifts? Sometimes it feels like the car goes into the red when the auto shifts during WOT acceleration. Where is the rev limiter?

My plan is to arm the system and keep my finger near the button. When the car is rolling under WOT and then reaches 3,000RPM, I press the button and hold until I want to take my foot off the gas (or until I hit the governer - sorry arnold). I think my biggest problem could possibly be hitting the speed limiter rather than the rev limiter.

Please advise!!! Thanks again!

[Shodown]

Re: Wiring without relay?

The rev limiter is factory set at 6200, but that can be moved with HP tuners.

Some say its bad to spray thru the shifts, some say it wont hurt anything. If you are interested I have an NOS window switch for sale that is set to spray between 3000 and 6000 RPMs. Thats the fail safe way to go.

Glad to hear that HSW hooked you up with a new relay too!!

[BobDoLe]

Re: Wiring without relay?

Ok, so I setup my wiring without using the relay. It looks like the switches can handle 20amps and the solenoid has a fuse at the battery for 30, so I see no reason to use a relay except for when I would be using the micro switch. I think I'll end up going for a tps switch very shortly though. I can see that there could be a danger of holding the button down when I let off the throttle if I was distracted just right (like in some sort of emergency).

Showdown, is there a reason why you don't like the window switch?

[Shodown]

Re: Wiring without relay?

Showdown, is there a reason why you don't like the window switch?

I'm lazy and didnt want to install it. :o