is that a "single wire"? i bought one from a guy that used it in a 78 pickup. was thinking of puttin it in my dart. he said i just hook one wire from the igntion power supply to the terminal on the distributor with no external coil or other requirements...haven't been brave enough to try it yet though....
I put HEI on my 1983 Slant 6 Mirada I just sold I can send you a diagram for the wiring PM me.
Ran the first tank of gas through the Dart after the distributor/coil upgrade.
My 4 tank average before the upgrade was 11.4.
My first tank after the upgrades was 13.3.
Besides the new distributor and coil, I also increased the base timing from 10 degrees to 15 degrees advance. Not sure if timing alone could account for 2 mpg. Spark plug gap remained at .035 for most of this tank.
Just before filling up, I regapped the plugs from .035" to .050". I will post again on the next fillup.
The two tanks average together at 13.2 which is a 1.8 mpg improvement with the new distributor.
I haven't been driving my 65 Dart 273 regularly yet, but hope to do better. Is that mixed city/hwy miles? If so, not terrible, especially if short trips with a cold engine. You might try running leaner. The big spark may make that possible. Not real easy with a carb, unless yours has metering rods (Carter or Edelbrock I think). I have Holley TBI in my BB, so as easy as turning a knob, though I have O2 feedback anyway.
You should start a new thread for this question. I don't quite follow your wiring description. If you can draw a schematic and scan it, that would help. I haven't installed mine yet, but I think there should be only 1 wire going from the HEI module to coil-. coil+ should be wired to IGN (12 V w/ key on). The HEI module also needs IGN (red wire?). I forgot if it has a ground wire or relies on the mounting to get its ground.I got one a couple months ago and just now decided to put it in. No luck. I read that it sometimes omes with a bad module so I put a new one in. Still no luck. Still wondering if I have the wiring right. The dizzy wires go straight to the coil and then the coil is grounded and I have it hot wired to the batt just till I make sure everything works. (I have a batt cut off so don't yall think it hot all the time) 12.8 volts at coil and the same at the lack and red on module. So any thoughts? Oh and i have the blaster 2 coil. Btw. This is the first time I really asked anything on here. I've reading for years and have built my duster all alone(except for everyone's help here) and I thank this site and the people here.
I haven't tried in the car yet.
Might get time over the weekend to try it out.
I just finished my second tank of gas with the new distributor, this time with the plugs gapped at .050". The gas mileage worked out to 12.9 mpg. I doubt the bigger gap hurt the mileage so I'm guessing it's just margin of error. The two tanks average together at 13.2 which is a 1.8 mpg improvement with the new distributor.
Finally finished my third tank of gas. This time only 12.5 mpg which brings my 3 tank average with the new distributor to 12.9. Still better than the old distributor, but not as much as I thought.
The best tank was the first tank before I increased the spark plug gap. Is it possible the bigger gap hurt the mileage?