Q1) okie so i was reading about the window switch. you guys said i have to buy a window switch and send it to MSD and have them program it. so if i wanna set my WOT from 3,600rpm - 6,200rpm (200rpm interval) for the nitrous to engage, so i simply just buy those little plugs and plug it into the RPM module selector?

Q2) or do you guys actually use different window switch?

Q3) how does the window switch (RPM module) connect into the nitrous system? basically in general, how do you install the wiring system from the window switch to the nitrous kit?

 

OK. Let's see if I can help

1) Most everybody does use MSD. But what you have shown in the pics are all just rpm modules. The big one is just a selctable rpm module so you don't have to worry about having a kajillion different pills. Cool but probably expensive and maybe not necessary for the casual user. You would buy the little rpm pills (like in the second picture) and plug those into an RPM Window Switch (which has a setting for activation usually 3000 rpm and a setting for deactivation usually 6200 rpm) or just an RPM Switch (which keeps you activated as long as you are above the set rpm usually 3000). The reason everyone uses a window instead of just a plain switch is so that they don't have to worry about nitrous running into the engine after red-line. You set the rpm so the system deactivates before red-line.

2) I use an RPM Window Switch MSD PN 8956. http://www.msdignition.com/pdf/pn8956.pdf But the reason everyone says you need to send this off to MSD is because we have distributorless cars. MSD has thought of this and instead of sending off the window switch just use a Dis-tach driver PN 8913 http://www.msdignition.com/pdf/8913_tachdriver.pdf

3) Basically your signal from WOT goes through the window switch. The window switch will provide a ground signal to your Nitrous relays starting at low rpm until you get above high rpm. So in this instance you arm the nitrous. Then if you floor it (Wide Open Throttle) and your fuel pressure safety switch is getting good pressure, the signal gets passed onto your RPM Window Switch. Your window switch waits until its within the operating RPMs (3000-6200 rpms) and then provides a ground signal to your relays (the relays are already powered from the arming switch, they just need to ground out to complete the circuit). When the relays complete the circuit they open up and the juices flow.

Hope you're confused

 

BTW you can go to MSD and under downloads they have all the wiring info for this stuff.

And about powering the nitrous relay: you'll need a relay from MSD that boosts the Current/Amps of the window switch. The signal the window switch sends to the nitrous relay is too weak to trigger it.

 

Does anyone have the window switch from NOS? I have heard that it is better to limit the high end of the switch at 5800rpm so you won't bounce off the rev limiter....Any one else?

 

I'm not using a relay for my MSD window switch (as well as for my VI) and it works fine...

 

How is the signal coming from your coil? Is it before the signal splits to the separate coils or just off of one coil?

 

Lower is always safer...but I also think that the 02/03 Maximas have ignition cut-offs and not fuel cut-offs, so going past red-line won't keep everything burning.

 

I have the NOS window switch and it works the same. I have the pills at 3000-6000. I have it set at 6000 in the event of a failure of my window switch.