madkaw Posted July 6, 2013 Share Posted July 6, 2013 Well this'll be the next step and progression for my Z, so I thought I would start a thread talking about my MS 3X install. My intentions are to have MS 3X run my ignition on my triple Mikuni carbs for now. Eventually I will go fuel injected but now I'm working on putting a plenum together. I have been studying the mega manual on a daily basis trying to figure out how I'm going to do my initial wiring. I do have a few questions if anybody can answer them about the wiring. As far as the wiring for the fuse box on the main plug. The example schematic shows the coil on just one fuse; with a COP coils would you still have it on just one fuse? The schematic also shows splitting the injectors between two fuses -will that work for our engine? I plan on running wasted spark -coil on plug ignition, so I do I will wire the injectors like I do with sequential and use the software formatting to make it wasted spark? Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted July 6, 2013 Share Posted July 6, 2013 Are you running cop or wasted spark? What trigger wheel. Quote Link to comment Share on other sites More sharing options...
madkaw Posted July 6, 2013 Author Share Posted July 6, 2013 COP wasted spark-basically both. I am going to run LS1 smart coils, but run them in wasted spark format. I will be using a 36-1 wheel. I actually drilled my flywheel and will use a Hall gear tooth sensor. Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted July 6, 2013 Share Posted July 6, 2013 With the MS3X, why run wasted spark? I was thinking having a bung welded on the valve cover and run a hall sensor on the can gear. Not that it matters with the spark, but batch or wasted fire injection is, well, a waste of fuel. That's why OEMs have been getting better economy. Quote Link to comment Share on other sites More sharing options...
madkaw Posted July 7, 2013 Author Share Posted July 7, 2013 Batch fuel injection is a waste of fuel- okay:0 You might want to rethink that statement. Of course, sequential would be optimum , but batch works just fine. I will eventually set up a sensor for the cam, but it is on the bottom of the list right now. A wasted spark and batch injection will be light years ahead of my dizzy and carbs for now. Quote Link to comment Share on other sites More sharing options...
Metro Posted July 8, 2013 Share Posted July 8, 2013 For simplicity I would run one fuse for the coils and split it off into the six wires using a junction block or something. It's all up to you though, if you think you need 6 fuses and have the room for them, have at it. I'm not really familiar with MS3x, I'm not sure if you can just use the software to run wasted spark COP. Hopefully someone from DIYautotune will chime in. I have a feeling you will have to wire them like you would for MS1/2, pairing 1+6, 2+5, 3+4 to output 1, 2, 3. There's two fuses for the injectors because there's two injector drivers. To keep everything separate, I went with two fuses when I rewired my engine recently. I ran with a single fuse before that. Quote Link to comment Share on other sites More sharing options...
madkaw Posted July 8, 2013 Author Share Posted July 8, 2013 Thanks for the reply. The MS3x is capable of sequential spark and fuel, but for now it's all going to be batch- and that's where it gets a little foggy. I wasn't sure if I needed to spread the load of the circuits out to more than 1 fuse for the coils . This was also my question for the injector power circuits; was there a reason for showing the injectors split up into 2 fused circuits ( 4 cylinder example on megamanual ) I know the MS3x will run wasted spark, but do I wire the coils paired like you said or is the wasted fire all done with the software. Back to the megamanual Quote Link to comment Share on other sites More sharing options...
Sam280Z Posted July 8, 2013 Share Posted July 8, 2013 You just need 1 fused circuit that can be tapped from the fuel pump relay output. Wasted spark will be handled by the MS3 firmware since it will not know the cam position. Quote Link to comment Share on other sites More sharing options...
madkaw Posted July 8, 2013 Author Share Posted July 8, 2013 Thanks Sam, I was just getting ready to post that I found the answer. It says in the manual to wire wasted spark COP the same as just COP. Like you said, it's all done in the firmware. One circuit makes it easy for the coils. Are you running 2 fuses for the injectors? Quote Link to comment Share on other sites More sharing options...
Dan_Austin Posted July 8, 2013 Share Posted July 8, 2013 I ran one fuse for six low-z injectors and one fuse for the six GM truck coils. I believe I ended up with 1 7.5A fuse for the injectors and 10A for the coils, but I may have that backwards. I started with 7.5A for both and blew one during a hard pull through 2nd & 3rd. This is with full sequential ignition and injection. I chose to use one fuse for each due to a limited selection of compact ATC fuse boxes. Quote Link to comment Share on other sites More sharing options...
Sam280Z Posted July 8, 2013 Share Posted July 8, 2013 (edited) Thanks Sam, I was just getting ready to post that I found the answer. It says in the manual to wire wasted spark COP the same as just COP. Like you said, it's all done in the firmware. One circuit makes it easy for the coils. Are you running 2 fuses for the injectors? Yes, but I am running 12 high-Z injectors. You should be able to get away with 1 fused power supply. Edited July 8, 2013 by Sam280Z Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted September 19, 2013 Share Posted September 19, 2013 I ran a fuse for the ignition (single coil) and a fuse for each injector bank (batch firing 6 lowZ 440cc Supra injectors). Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted September 20, 2013 Share Posted September 20, 2013 I run one 10 amp fuse for ignition, six coils. One 10 amp fuse for injectors, six low impedance. And one 10 amp for all the stuff that requires 12 v for sensors, like MAF, boost solenoid, CAS, and EGO. That's how Nissan does it from the factory. Quote Link to comment Share on other sites More sharing options...
madkaw Posted September 20, 2013 Author Share Posted September 20, 2013 Well I haven't done much lately except for fixing squeaky urethane bushings. I did manage to finish up a prototype(sounds official) for my D585 bracket. This is pretty much a finished product, but might need some tweaking once I install spark wires. It was tougher than I thought trying to find room for all this; plus the fact that Delco couldn't have made these coils anymore unsymetrical in shape. I didn't want to reroute my heater hose and it will run under the bracket. The bracket attaches with the 2 bolts for the heater hose. I plan on using studs for mounting and it will be easier to utilize the block for grounding spots ,since there are so few. I bought a complete set of coils and diced and spliced the harness to make a six banger set-up.The connectors just clear all obstacles. The spark wires might be custom or stock. The stock wires might work by just looping the extra length of wire-if you can picture that. MS power; I have kept an old 82zxt harness that was in amazing condition and I have been canning parts from it. I have pictured what i think is the main starting circuit relays or the main relays off of the zxt. The fuse terminal block with the two leads I will use in line from the battery to the main relay. I'm betting it's a 60 amp for the zxt. The two relays mounted together should be perfect for the main and the fuel relay. The battery power will come from a 10 guage wire from the + battery. I will use another ganged fuse block like the one pictured on the inner fender which will be powered off the main relay. That will be dedicated for the MS. The ganged fuse block that is already installed will be just for accessories since it is powered straight off the alternator. Question regarding ignition input. I stare at the schematic that was supplied by DIY and I am having trouble interpreting how the ignition should tie in. They show power parallel to the battery +. Are they just implying that you need a hot wire from your ignition for the relay? I might be over thinking this. Quote Link to comment Share on other sites More sharing options...
madkaw Posted September 20, 2013 Author Share Posted September 20, 2013 I guess it would have helped to included installed pic Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted September 20, 2013 Share Posted September 20, 2013 That's a really nice ignition setup. The ignition switch output needs to power the main relay to switch on power to the MS as well as the fuel pump, ignition coils and injectors. Quote Link to comment Share on other sites More sharing options...
Chris83zxt Posted September 20, 2013 Share Posted September 20, 2013 Any interest in making more of the d585 mounts? That's what I'll be using when I do my MS3x switcharoo here in a month or two. Quote Link to comment Share on other sites More sharing options...
madkaw Posted September 20, 2013 Author Share Posted September 20, 2013 I have enough to make at least 3 or 4 more, but it's nothing special at all. Just 1.5" square aluminum notched with a hole saw to allow the round coil to sit flat. The bitch has been getting them situated that I can run the spark wires. This might not be my last version before it's all over. I need to get some stock wires from the JY and see how it goes. It would be nice to just order off the shelf than to make custom sets. Quote Link to comment Share on other sites More sharing options...
Chris83zxt Posted September 20, 2013 Share Posted September 20, 2013 (edited) My plan thus far has been to use some heavy gauge sheet metal to do my bracket, but I'd happily buy something pre-fabbed if the price was right. Edited September 20, 2013 by Chris83zxt Quote Link to comment Share on other sites More sharing options...
madkaw Posted September 22, 2013 Author Share Posted September 22, 2013 Let me finalize my design complete with wires before I try and sell anything. What you see here is my 3rd version already. Next will be deciding how and where I am going to run my harness(s) thru the firewall. What have some of you guys done? Quote Link to comment Share on other sites More sharing options...
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