Ok I am working on a small project for a friend. I am trying to convert his shift light to a Nitrous window switch. Using the diagram below what do yall think?

Any other suggestions?

Thanks

 

How much would your friend be willing to pay for an MSD window switch?

 

I believe the purpose of a window switch is to turn on at a certain rpm and turn off at another set rpm. The shift light will work for turning on, but if he ever hits fuel cut he will have problems.
-hype

 

I agree... although I know people have run for a while without, just carefule not to hit the limiter.

I think a real window switch will serve better, my buddy has one he isn't using 'cause he went to a turbo. I'll ask him how much he wants for it when I see him. Just give me an idea what your friend would pay.

 

He has one on order but we want to go to the track SAT

xhypex- your right the main purpose is on at a certain point off at a certain point.. to not go BOOM is the main idea

Guess I should has made it clearer what I want to do. I want the be able to turn the Nitrous solenoid OFF with the shift light.

He does not want to buy a switch, he has one coming..just wants to run his NOS at the track with out worring about the big bang theory

 

I don't believe you can accomplish what you want with the shift light. The shift light would work great for turning things on, but turning the solenoid off is another story. If you wire the 12V to the solenoid and to the relay in parallel, when the shift light activates, the solenoid will still be getting 12V. The only way to stop the 12V signal going to the solenoid would be to ground the signal (short circuit), but you would get sparks and lots of heat.

I would say wait for the rpm switch. You'll spend a decent amount of time and energy wiring this up for one night at the track only to take it off soon after.
-hype

 

Yeah that is kind of what I thought. The diagram was the best I could come up with. If I had to turn something ON it would be simple, but turning something OFF with a GND is very difficult.. I found this out last night after about an hour

Thanks for you help. I needed someone else to look at it.. I am not convinced that it can't be done.. I just can't see it.

Maybe a bacardi and coke will help.

thanks again

 

cut the power wire going to the solenoid
one side of the wire goes into pin 30 of the relay (SPDT), the other side goes into pin 87A of the relay
+12 to pin 85
ground output from shift light to pin 86

30 connects to 87A when it doesn't have + and -, then when you give it the ground signal, 30 will be connected to 87 which is open so you'll have no signal going to the solenoid on the + wire

 

Man you really make me feel like I am lost whe it comes to wires..lol
and it's my job

I thought 30 & 87 do NOT have continuity when the relay is OFF?

I should have just PM'd you..lol

 

Nice job Craig I'm still relatively new to 5 pin relays, but that will definitely do the trick. That's great information for future projects.
-hype

 

Since we both just learned from Craig maybe we can help someone else
Here's a relay
http://www.partsexpress.com/pe/pshow...Number=330-073
Here's the instructions
http://www.partsexpress.com/resources/relays.html


85 and 86 are the triggering 12V and ground (which can be reversed). Whenever a 12V (85) and ground (86) are provided, the potential difference makes the relay click and puts it in the energized state.

30 is your input voltage in this situation which feeds 87a (the nitrous solenoid) when the relay is at rest, and feeds 87 (which is empty) when the relay is energized.

When I installed my VI I used a Nissan 4pin relay, so I haven't had much experience with 5 pin relays. Now I know what that extra pin is for
-hype

 

I used a 4 pin relay as well I thought that is what craig was refering to ..

Thanks for helping get my head outta my butt

Owe you two.. craig just start a tab..it'll be simpler that way..lol


Now is there a possible problem having that voltage sitting there in the relay? Or since it will be short periods of time.. it is ok?

 

single pole, DOUBLE throw is the way to go

pin 85 and 86 are the coil, pin 30 is normally connected to 87A, when the coil is energized, pin 30 connects to 87 and 87A is not connected to any thing

problem with what voltage? if you're talking about pin 85 +12 V source, just wire that to IGN power or something like that; the relay wont draw any current (well, very little) from it until you connect the ground and then it will go through the coil

 

I think he's asking about what happens to the 12V that goes to 87 after the relay is energized. It's an empty connection, but will the relay heat up?
-hype

 

oh, that's fine, it's just a closed switch with no load so it wont cause any problems

if you are worried about it, wire the side of the cut wire going to the battery to pin 87A and the side going to the solenoid to pin 30

you could also do it that way if you need to switch the wire into the solenoid from + to ground by then wiring pin 87 to ground but I dont think you'd necessarily need that for this application

 

SPDT....again I did not read/see that.. I need to pay more attention to details

yeah..exactly what hype mentioned..just worried about frying the relay with the voltage sitting there..but I think your correct

But since you and hype helped me with all the info I just wanted to make sure I did not ruin much good information with a bad decision

thanks again guys

 

No a side note craig..you gonna be able to make it this saturday?? my house BBQ and track day at silverdollar

 

Ok Bags and Craig, here is where we are at.

The 86 is constant power 12 volts, and the 85 is constant ground -. What do the other relay points plug into? Meaning what do the 30, 87, and 87a plug into on my nitrous setup?

Thanks......You two are a huge help.

 

I'm not sure how exactly your setup is now, but I'm assuming you have a + and - (ground) to the solenoid bags mentioned

cut the + wire so now you have 2 ends from that
one end of it goes to pin 30
one end of it goes to pin 87A
IGN 12V to pin 85
ground output from shift light to pin 86

when car is on, pin 85 will have voltage but 86 will have no signal so pins 30 and 87A are connected
when the shift light comes on and gives the ground ouput, the relay will "turn on" which means it connects pin 30 to pin 87 (and not 87A) so this will stop power from going to your solenoid

hope this makes sense, if not, email me craigbrace@hotmail since I dont read 4th gen forums very often

and unfortunately I wont be able to make it to the track and meet this weekend. I'm back at school and playing on the GT club soccer team and we have 2 games at Clemson on Sunday

 

Ok, well I hope you do well this sunday

Maybe we can have a meet when you have a game..we can support ya

thanks for clearing it it again.. between that and what you wrote previously and the directions hype has maybe we can get erik's nitrous running.

have a good game and fun this sunday

 

Ok, well I hope you do well this sunday

Maybe we can have a meet when you have a game..we can support ya

thanks for clearing it ip again.. between that and what you wrote previously and the directions hype has maybe we can get erik's nitrous running.

have a good game and fun this sunday

 

Ok, awesome Craig, you are the pimp. Now, I can also plug the + of the shiftlight into the 87 pin so when the shift light ground is turned on, it switches over to pin 87 and turns on the actual lights to the shiftlight.

 

just read this... so I guess there is my answer.

But your shift lights should be on anyway right?

Or do you not have them hooked up?

 

how did it work out ?

 

erik has yet tel let me know. He is in school while I ***** the org...

You'll see the video from when we go to the track tomorrow.. BTW 100 mile trip one way..this should be fun