Guys I`ve a couple of questions concerning wire type. I`m building a plug and play adapter for my MS and want to use sheilded wire where I should. Problem is that I can`t seen to find anything that tells me which circuits need this type of wire.
Do I use it for CAS NE+ and NE- wires?
Do I use it for trailing coil IGT-T wire?
Do I use it for leading coil IGT-L wire?
Do I use it for trailing coil IGs-T wire?

I also want to clarify that for these IGT-T, IGL-L, IGs-T connections will be made at the leds negatives then run wire over to the DB37 connector and attach to unused pins then wire those pins to ECU plug terminals 1U, 1V and 1X is this correct?

Lastly, Pin 28 on the DB37 connector appears to provide 12 volts to the Megasquirt. In looking at the diagram I see that the injectors receive constant 12vdc when key is on. Does this mean that MegaSquirt controls the injectors with the negative circuit. Is this correct?

Thanks in advance !

 

Usually the only shielded wires are the 4 CAS wires and the stock NB O2 sensor wire. Ground at one end only to prevent ground loops.

We need to know what series car (s3,s4,...) and engine (na or turbo).

Yes, the MS controls the injectors on the ground side.

 

Okay, I`m lost. I thought there were only two CAS wires I am supposed to use, NE+ and NE- (I have already removed two opposing teeth from the CAS) If I`m supposed to be using four , what are the other two I need.



Sorry about that, I have an S4 NA `86 GXL .




Thanks, thats what it looks like in the diagram. Negative switching is something I`m not used to. I`m a (twenty five year) Heating and Cooling service tech. Just gotta learn to "think" backwards!

 

if you cut 2 teeth out, you only need Ne+ and Ne-

 

Where should the sheilding for the shielded ignition wire be grounded to. Is it okay to use one of the DB37 ground pins. (pins 8, 9, 10, 11 or 19) Or would it be better to ground the sheilded wire straight to the body of the car.

 

ground to the MS.