shadowlife25

i recently picked up the ignition system from a '79 Rx-7 and I noticed that it already
has the parts needed for the DLIDFIS setup that Dave20b designed minus the j109 ignitors(which I have)
My questions are as follows :
1. How would I wire it up
2. what are the differences in the stock wiring colors from the different years, and where do they go, respectively.
3. Should i gut the housing on the '79 setup or leave the circuit board in it as it was setup for a leading trailing split already?
4. Can I just tie the ends of the + & - leads together for DLIDFIS form the stock '79 setup?
5. Will it work on my '85 gsl-se as-is if I just tap into the correct wires?

Any help on this would be great as I currently cant find any literature on the '79 ignition wiring and don't know how/if it would work on my RE-EGI system.

Thanks,
Mario

Siraniko

iTrader: (13)

79 is points ignition. Use 81 + so you dont need to hazzle adjusting the points.

Jeff20B

iTrader: (13)

Don't even look at your '79. Concentrate on the GSL-SE. Probe the wires and find out which ones are 'hot' when on and running. I don't have access to a 1st gen so I can't tell you what wires do what, or their colors etc.

I assume from your questions that you haven't read this yet. It's a little out of date and there is no need for shielded wires, but it's still full of useful info.

Metallic_rock

use a 2nd gen coil... it's easier. *ducks flames from Jeff20B*

been using it for a long time... the fact that they still use that system on the 2nd gen, 3rd gen tells me that it's better.


That's my opinion.

Jeff20B

iTrader: (13)

I'm getting tired of people removing the awesome ignitor from the base of 2nd gen coil assemblies. It's mountains better than a J-109. What somebody needs to do is figure out a way to use a J-109 to trigger a 2nd gen leading ignitor. The J-109 has all the dwell timings etc to correctly control the 2nd gen ignitor. It just needs a 5V square wave trigger signal which the J-109 could be coaxed into providing. A resistor, transistor and probably a couple other components are necessary. I'd take on such a project if I wasn't so busy.

Metallic_rock

I know what you're saying, Jeff, but the reason I set it up like that was so it would be a direct drop in. You mod the 2nd gen setup and you can easily go back to stock if you don't like it.

In the DLIDFIS, you have to cut the wires to the ignitor, rendering the dizzy useless if you want to go back to stock.

That was my main reason: Ease of install and reversal.

Jeff20B

iTrader: (13)

Uh, no. I've never EVER cut any wires inside the dizzy. I feel sorry for the folks that do since, as you say, it can never go back to stock (without some creative soldering). Every DLIDFIS install I've ever done is fully reversable. Having said that, yes, yours is a direct drop in that's pretty easy and reversable too. There just needs to be a simple circuit that could be constructed (or purchased if someone isn't savy with a soldering iron) that consists of a couple resistors, a transistor and maybe a diode that will allow easy use of the J-109 connected to the 2nd gen ignitor and also be reversable. Someone just needs to take the time to do it.

I plan on building another MegaSquirt for my carbed supercharged 13B project simply for the boost retard feature and run it in ignition-only mode, and because full 2nd gen ignition control is close to a reality, but in the mean time, I may just take on this J-109 trigger project to take advantage of the powerful 2nd gen stuff. I'm sure the original DLIDFIS will be pretty good since even a stock cap and rotor setup has shown to be fine when boosted, but I'm the ignition guy. I'm compelled to work on this stuff afterall. Ah crap, looks like I'll have to add yet another project to my list.

shadowlife25

[QUOTE]

Jeff, I did read your write up on DLIDFIS and I think it's great! i happened to be in the wrecking yard a few days ago and came across a '79 that was mostly untouched so I took the
wiring harness and the ignition setup and i wanted to know how to mod this to DLIDFIS as the ignitors are already mounted to a box(heat sink) and it comes with a separate harness and some nifty molex plugs that make everything quite neat and stock-looking. I was just interested in knowing if anyone has used this idea/method before and if so how to go about doing it with the stock wires.
I guess i'll just rewire it all and keep the cool little box and wire harness
Thank you for the replys,
Mario

Jeff20B

iTrader: (13)

This RX-7 you keep refering to as a '79 is actually an '80. It's got J-105 ignitors on the box which turns the trailing one off every now and then to keep a constant supply of unburned hydrocarbons feeding the thermal reactor. My advise, again, is to stop paying attention to it and consentrate on the GSL-SE stuff.

If you're into tinkering, you could try popping of the reluctor from the GSL-SE dizzy and swapping it onto the '80 dizzy, then it would allow easy wiring to some J-109 ignitors (loose the control box, but hang on to the J-105s). You'll see why I you should swap reluctors when you compare them. One has a slow rise time a fast drop off. The other is sort of reversed. You want to the J-109 ignitors to be triggered by the slow rise, fast drop reluctor. I assume the VR sensors (magnetic pickups) of both dizzies have similar resistance and inductance, but I haven't ever bothered to mess with the '80 style, nor have I ever measured the '81-'85 type. If you want to break new ground here, you're more than welcome.