 123ignition to signal ecu?, or do I need a cranck trigger? |
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| barkamatic |
 Oct 16 2025, 03:36 PM
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Newbie  Group: Members Posts: 49 Joined: 6-March 23 From: Colorado Member No.: 27,211 Region Association: Rocky Mountains  |
Purchased a 123 ignition for a D-Jet but due to the difficulty of finding D-Jet parts I have decided to go with an aftermarket system. Probably a silly question, but could I use the FI firing triggers from the distributor for a crank position signal? Thanks in advance.
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| emerygt350 |
Oct 18 2025, 09:42 AM
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Advanced Member Group: Members Posts: 3,317 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
My mustangs tbi could care less about position of anything but the throttle (and a bunch of temp and pressure sensors). The computer does play with timing but really only to set the idle. And it knows that through the ignition module on the dizzy.
I bet you could get away with it since firing the cylinder is going to be determined by the distributor. If you keep it bank fire, timing the injection pulse need not be perfect and if that is the only thing the system is using the crank sensor for ... |
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| Superhawk996 |
Oct 18 2025, 10:11 AM
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914 Guru Group: Members Posts: 7,471 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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QUOTE(emerygt350 @ Oct 18 2025, 11:42 AM)  My mustangs tbi could care less about position of anything but the throttle (and a bunch of temp and pressure sensors). The computer does play with timing but really only to set the idle. And it knows that through the ignition module on the dizzy. I bet you could get away with it since firing the cylinder is going to be determined by the distributor. If you keep it bank fire, timing the injection pulse need not be perfect and if that is the only thing the system is using the crank sensor for ... Emory raises a valid point as long as you’re not trying to do sequential and the 123 is handling spark. The biggest issue is the propensity of these dizzy drives to get installed out of time. But assuming you can pull any of this off, I’ll assume you’re capable of installing the dizzy drive correctly. Most ECUs are expecting a Hall effect input for the crank signal. The D-jet and 123 is just providing a switched output like the trigger contacts but maybe you “invent” a MOSFET / “one shot” driver to convert to a Hall effect square wave voltage output? (IMG:style_emoticons/default/idea.gif) As mentioned earlier not impossible but it’s not straightforward either |
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Posts in this topic
barkamatic 123ignition to signal ecu? Oct 16 2025, 03:36 PM
dtmehall dude;
you have left the reservation!
keep yo... Oct 16 2025, 08:17 PM JeffBowlsby Gotta ask, what djet parts are you missing? Your ... Oct 16 2025, 08:27 PM
barkamatic the car is a '73 2.0. Stock. I received the ca... Oct 17 2025, 02:02 PM barkamatic By the way, I have read pretty much everything you... Oct 17 2025, 02:05 PM chmillman
Bought a D-Jet system off the internet but it was... Oct 17 2025, 03:45 PM barkamatic
Bought a D-Jet system off the internet but it wa... Oct 17 2025, 06:22 PM emerygt350 I think it would be great to document how you do i... Oct 17 2025, 07:05 PM barkamatic
I think it would be great to document how you do ... Oct 17 2025, 08:05 PM emerygt350
I think it would be great to document how you do... Oct 17 2025, 08:10 PM dtmehall the trigger points on the old D* systems were neve... Oct 17 2025, 08:48 PM Superhawk996
Probably a silly question, but could I use the F... Oct 17 2025, 08:51 PM barkamatic
Probably a silly question, but could I use the ... Oct 17 2025, 09:26 PM Superhawk996 Bottom line: D-jet injectors are bank fired and sh... Oct 17 2025, 09:47 PM barkamatic
Bottom line: D-jet injectors are bank fired and s... Oct 17 2025, 10:23 PM JeffBowlsby I have no predisposition about custom aftermarket ... Oct 18 2025, 01:39 AM chmillman I agree 100% with @jeffbowlsby about the downsid... Oct 18 2025, 03:49 AM barkamatic
I agree 100% with [b]@[url=http://www.914world.c... Oct 18 2025, 10:00 AM JeffBowlsby
With all due respect, evidently our reasons for o... Oct 18 2025, 10:26 AM barkamatic
My mustangs tbi could care less about position o... Oct 18 2025, 11:23 AM |
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