hey,

guys i really need some help. i installed a zex wet kit. i want to run a window switch, i bought a summit racing switch which is a pain to get to work with the zex kit. i will work on that later as a back up for my next plan. i have a utec and found by reading other forums that you can use the aux output as a tps/window switch, i called and confirmed this with turboxs but they were not able to help me wire it to a 4 point relay to the zex kit. i plan on getting it tuned on thursday so i need to know this asap. i have a standard automotive 4 point relay with pin 30,87,86,85. also the utec runs a ground trigger not a 12v trigger so that may make it a little more tricky to do. please help me get this done if you can, thanks

 

I tried and spoke extensively with TurboXS while I was setting it up. It was a huge PITA and I wound up burning up the extra controller. You also need the previous version of the software (not the most recent release, but 2.6d I think).

I wound up buying a NOS window/rpm switch and saved myself further headaches. TurboXS no longer supports the Utec, so if you can arrange to use something else I'd do it.

 

why would the older software work better than the 2.8? i called them and they said it will work but its only capable of working as a ground trigger, i talked with a buddy on here about how to wire the relay to work with it and i will post a picture of the diagram i plan on wiring, i will also test it with a light before i rely on it

 

here is a crude diagram that i came up with, i think this will work as the utec offers a ground with the auxillary switch. i already bought the relay because i would have had to use it for the summit racing window switch i have as well, i just like the idea of being able to activate nitrous using the utec at certain parameters like coolant temp, tps, and other things, if anyone else has done this setup please let me know if i have a good grasp of what needs to be done and if this diagram is correct, thanks

 

i think you want the switch to be connected to IGN, not BATT. the BATT connection to the relay should have a fuse in it too

 

if it were me, especially since you are tuning this week, just hook the system up to a simple switch to get you through the tuning phase. then after you are done tuning and have more time, then figure out how to get the window and throttle position safteys all set up, imo

 

yeah your right about all that, i just wanted to emphasize whats what and where what goes, i have it wired to the ignition, and there is a fuse inline, kinda hard to get detailed in windows paint, lol. i was more focusing on the relay wiring than the rest, but other than those issues. will this work you think?

 

its tough to say, but my gut says no. i had a utec, but i didnt have a zex kit and i used a separate window switch. wont the utec account for both the window (rpm) signal AND the throttle position signal? if that is the case, no need to wire the tps to the relay, imo. im just trying to think through this. the whole point of a relay is to have 2 separate circuits. one low power for the switch, and one higher powered one to activate the system with a fuse.

 

my guess is that you first need to make sure you configure the zex brain to accept a ground (not a positive 12v) as the signal it needs to activate the system. then, for the relay, one circuit would be IGN to arming switch to relay to GND. then the other circuit would be the wire from the utec to the relay to the zex brain. so when you arm the switch, it completes the first circuit, which would then activiate the second circuit. but the circuit would not get a ground from the utec unless the throttle position and window prerequisites were achieved. that is my guess at it

 

yes i would still have to have the tps wired to the relay, the reason for this is because, the tps signal is what triggers the zex box, there is no actual wot switch with this kit, it activates at 4.5v from the tps on the throttle body, the utec only works as a ground trigger for the spare solenoid. it does engage the window based on rpm sig. and throttle position, but if i set the spare aux output to only work off of rpm sig. then it will just be a window switch. the way i have it setup, when the utec closes the ground on the relay, the relay will then close the tps circuit that will activate the zex kit. this is the way it has to be wired with a regular window switch unless i pay another 175 for the zex window switch, because of the tps signal activation the zex works with. it is complicated setup thats why i wanted some opinions. im sure i am not the only one that has installed a zex kit with a window switch other than the zex brand and had to use a relay to make it work.

 

so you cant configure the utec to only send a GND when both rpm and throttle position parameters are satisfied? fwiw, i hate zex, its overcomplicated and just something else to break

 

ok, so for me to understand what you are saying...

circuit one is IGN to arming switch to relay to UTEC GND, which would then activate the second circuit, which is...

TPS signal to relay to ZEX brain?

if that is the case, it should work. you would need all three (armed, window, and tps) to be satisfied for spray to work. try it with a light

 

this is how the relay works i think if what i have read is correct, the positive is connected on one side, the ground is connected on the other, either the positive or negative pole has to be a switchable source, the utec is a switchable negative source. when the ground is established via the utec it completes the circuit between 85 and 86 poles, when that happens it triggers a connection between 87 and 30, that closes that circuit which in this case is the tps wire, think of it as a manual switch, one end of the tps is wired to the switch and the other end to the other pole. when you flip it manually it completes the connection and allows the current or information to travel pass it. atleast thats what i am gathering at this point and i hope it works. i will try it asap and let you guys know for any that is interested in using this method. if someone that is 100% percent sure if i am right or wrong please chime in, thanks

 

only way to be 100% is to try it, just worried that the relay will activate the other circuit as soon as you arm the switch, but give it a shot, hopefully im wrong

 

looking at your beautiful paintbrush diagram again, and actually understanding that the zex brain needs a 12v signal, what you have should work. report back please, cause now im just curious

 

zex is actually super simply to install, there are only 3 wires to connect it to get it going, i am making it complicated only because i want the extra piece of mind with a window of spray so i dont spray too low in the rpm or at redline like if i miss a gear and blow my motor, they even make a window switch that is way easier than what i am trying to do but its 175 bucks, i have the option using my utec. i would have used the summit racing window switch with the relay but after i hooked it all up it wouldnt read my rpm signal from the #1 coil pack, i couldnt figure out the pulse signal the switch needed. so i figure why not just use the built in utec feature that will be just as accurate. i highly recomment the zex kit for 350z, its a bit pricey but has everything you need to get up and going. just buy a window switch and nitrous gauge!

 

you arent making it complicated, you are doing it right. zex made it complicated for you to do it right. trust me, there are better nit kits out there. either way, let me know how this all shakes out

 

word, will do, i plan on wiring the relay tonight, and checking it tomorrow after work, i have to have if finished by thursday cause i plan on getting it tuned then!

 

test it with a light before you put it all back together, just do minimum to get it hooked up to see if it works first