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Ignition suggestions..

Old 02-24-06, 12:20 AM
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Question Ignition suggestions..

I've pulled all my emissions and swapped over to a 45 DCOE. I was wondering what people have done for ignition on the 86's and up since they have the cas instead of a distributor. I am wondering what people have done to retain direct fire after gutting the harness and ecu out of the car. Looking for a solution that will outperform the cas/ecu ignition.
This is the last thing i need to get it running. Any help appreciated in advance.
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Old 02-24-06, 02:41 AM
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The easiest option is to use a 1st gen distributor. It can be from a 12A car or a 13B one (GSL-SE). From that point, you have several options:

- use the 1st gen ignitor to fire the 2nd gen leading. This will give direct fire on the leading. The trailing will still have to go though the distributor. You could use one of the 2nd gen trailing coils for trailing or get a normal coil for that (1st gen stock coil, MSD Blaster 2, and so on).

- Get an MSD box to fire the 2nd gen leading. Have the trailing same as above or get a 2nd MSD box to fire a trailing coil as well (not really worth it IMO). May be good option if you get 2 MSD 6AL boxes to have a rev limiter.

- I have developed a circuit to interface the 1st gen distributor/ignitor with the 2nd gen coil pack. What the circuit does is convert the signal from the 1st gen igniton to an ECU like output. That output will then trigger the 2nd gen leading coil pack. This is a simple way of using the 2nd gen leading without an ECU. The 2nd gen ignitor is much better than the 1st gen one so that is the purpose of using such an interface. It doesn't do trailing, so that will have to be handled similar to above. This is the thread about it (very long):
https://www.rx7club.com/1st-generation-specific-1979-1985-18/transistor-trick-2gcdfis-411312/

There are a few other options as well for the 1st gen style igniton. Most are pretty easy to do to and are pretty inexpensive. Usually none of these options will have direct fire on the trailing. It is hard to do without some way of knowing engine position and such. Trailing is not important so it doesn't matter if it has direct fire or not.

Hope this helps.

Kent
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Old 02-25-06, 01:28 AM
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So how about a GSL-SE dizzy (same advance curve?) a Jacobs FC1000, a 15v charging system ... a C4 coil for leading and gutted trailing? leave the plugs or get pipe plugs?
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Old 02-25-06, 08:58 AM
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A GSL-SE dizzy is fine. The advance curve is a little bit different than the 12A one, but not by much. What kind of trigger does the FC1000 use? Does it connect to a VR sensor or does it need a digital type pulse like from an ECU? The other stuff seems good. The 2nd gen coils do work pretty well. I don't know what would be a better option. Plugs are up to you. Typically us 1st gen guys will run 2nd gen leading plugs when we put direct fire ignition on the leading. We usually use 1st gen plugs on the trailing. I think they probably work a bit better for the through cap type ignition.

Here are the advance curves for the 12A and 13B dizzy. The 13B has more advance overall. I believe the figure is wrong on the RPM. They show engine RPM as 1/2 dizzy RPM. Really it is the other way around. Max mechanical advance occurs at about 4000 rpm (engine).

Attached Thumbnails Ignition suggestions..-advance.jpg  
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Old 02-25-06, 12:59 PM
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Just like hooking up a MSD6, magnetic pickup or trigger.

I'm trying to make sure I cover the advance part here, dont want to be handicaped by a retarded ignition unless that has its benifits.
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