-=][ShAdoW][=-

Well, I finally got my MSD RPM window switch, now I have no clue on how to write it to my zex system. Someone can you help me w/ this?



Thanks guys. Sorry if i seem newbish =P

I did a search...found nothing =(

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axion68

did it come with a manual? if so, check and see if a ground turns the switch on or 12v does. It would probably be best to have the window switch turn a relay which will power the noids. I can probably draw up a wiring diagram for a simple relay install, however I'm not 100% sure how the whole barney box works.

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laughin2.2

Do you have an MSD ignition or an aftermarket external coil?
http://www.msdignition.com/pdf/pn8956.pdf
The diagrams are pretty straight forward. What specific questions do you have?

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SMSP
Hondata
194 whp/150 trq

-=][ShAdoW][=-

Stock ignition. I know how to power the 12v and ground, but where does the other wires go?

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laughin2.2

Connect the noid ground to the yellow wire.
The white wire needs to run to the negative coil wire. I bet there is a tach output wire coming from the ECU as well. Call up the MSD tech line and see what they have to say about the white wire on a honda.

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SMSP
Hondata
194 whp/150 trq

axion68

http://www.msdignition.com/pdf/pn8956.pdf

oohh wee, this looks fun. let me see if I can figure something out here....

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axion68

Ok, I would recommend calling an MSD tech before doing this, as I don't know if the stock ignition is non-inductive or not.

Looped Wires:
For a 4 cylinder applicationi you will want to cut both the red and blue wire.

Red Wire:
Connect the Red wire to a switched 12v source

Black Wire:
ground

White Wire:
Connect to the green wire going to the coil, this is the (-) coil wire.

Yellow:
When the switch is active, this wire will be grounded. However the RPM switch can only handle 1.5 amps so you will want to wire it into a relay. This is the wire I'm concerned with, so call MSD and ask a tech if you can hook up the yellow wire to the ground wire going to the coil on the stock ignition system. If you can't, you will need to connect this wire to the Tach Output Terminal on an aftermarket ignition.

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axion68

Now for the relay

These directions are for a 5 pin bosch relay (most auto stores carry them) and an arming switch that turns on and off +12v.

1. +12v from battery (switched)
2. Yellow wire from MSD window switch
3. +12v output to nitrous system
4. +12v from arming switch



Basically you are going to cut the wire that goes from the +12v arming switch to the barney box. Connect the wire that leads to the barney box to pin 3 and connect the wire that leads to the arming switch to pin 4. This will only work if your arming switch is turning on and off 12v, not a ground.

In a nutshell when you arm your nitrous system pin 4 on the relay gets power. Now when you hit the initial rpm you have the window switch set to turn on at, it will ground pin 2, and pin 3 on the relay will get power. Now in order to spray, you have to have your switch armed, be at WOT and be in the rpm range you have the window switch set at. If one of these is not met, then you will not be spraying.

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