1/25/14 1:26 p.m.

hey, Im mitch from the bay area

I am working on getting EDIS setup with megaquirt on a 3.3L subaru EG33 for a porsche 914 project

the wires going from the EDIS 6 module into megasquirt and from the EDIS module into the VR sensor are shielded with a spool of what looks like aluminum wire inside the groups of wires.

the wires on the EDIS module to the Coilpack don't seem to be shielded but seem to be made of a special material.

if anyone with EDIS experience can give me a general list of which wires need to be shielded and what I can use to shield them that would be awesome. I am looking at this 3M EMI tape as an easy option. also have read about just wrapping the wires in alum foil before taping them up but that seems possible sketchy.

any help is much appreciated


p.s. its a little late in the game for this but how much should i worry about wire length and gauge in the harness i am building? I have read that length of wire effects resistance and that some people pre-measure and calculate the length of any wires they use based on the resistance and current and whatever they intend to run through the wires.


bentwrench Reader
1/25/14 6:45 p.m.

Why are you using an EDIS? MS1?

I built my MS2 with 3 ignition drivers and use a 6 pak wasted spark coil.

You can even do COP sequential ignition if you give up Baro correction. (MS2)

MS3 will do sequential everything

mwood95 New Reader
1/26/14 7:15 p.m.

have MS2, using edis because of the cheapness and availability of parts. I was thinking I would switch to Lsx coils and ms3 in the future but thats for later. I already have everything for the EDIS so Im not really looking to change the setup for now.

any info the shielding question?


turboswede UltimaDork
1/27/14 10:12 a.m.

This has the information you're looking for:

That said, I'd ditch the EDIS module and just use the crank pickup and coil pack directly with the MS2, it is the preferred solution these days as it requires less wiring and provides more finite control over the ignition system.

Detailed here:

I would also strongly suggest using the MSExtra code as it extends the functionality of your MS2 quite a bit.

mwood95 New Reader
1/29/14 4:22 p.m.

I dont know how I missed that you could use MS2extra to control an EDIS coil but that looks like it will save a whole bunch of wiring and work. thanks for the tip.

if anyone is curious, I have found that you 100% need to use shielded wire on VR sensors. you can buy it at they also sell pvc insulated wire loom which looks like a good bet for module to coil wiring. Its pretty cheap so even though I don't need it Im going to buy some anyway for the durability. I dont see why you couldnt get away with regular wire.

turboswede UltimaDork
1/30/14 10:55 a.m.

Yes, the first time I wired my VR, I used thin headphone cable that was shielded. It wasn't shielded enough though, so I replaced it with slightly heavier double shielded wire from the local Radio Shack and my problems went away. The entire spool was fairly cheap and I didn't have to wait for it to come in :)

Once I update my MS1 to MS2, I'll drop the EDIS box and directly control the coil, but the control box has worked fairly well so far.

Derick Freese
Derick Freese UltraDork
2/20/14 1:40 a.m.

Cars are noisy environments, so you need good shielding on that cable. I prefer to use a heat resistant shielded cable, and keep the length as short as possible to cut down on any chance of that cable becoming an antenna.

T.J. PowerDork
2/21/14 11:06 a.m.

I used shielded wire that was sold as security system wire at Lowes or Radio Shack. I didn't realize MS2 could do without the EDIS box either, but I did the install a few years back.

EastCoastMojo Mod Squad
3/11/14 6:24 a.m.

Zombie thread, canoe deleted.

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