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Old 07-28-2018, 05:32 PM   #15
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I tend to agree that the two wires go to one injector only. If it was one wire per injector then it would only be good for throttle body injection and not multi port injection.

What I believe happens is the system counts the number of pulses and uses that to help determine fuel usage. Kinda of a crude way to to it but it should be in the ball park.

Do you have any instructions on what settings and/or parameters that you have to enter when you set things up? I.e. number of injectors, etc.

Brad
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Old 07-28-2018, 07:19 PM   #16
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Brad,
I have no info, but, my guess is:
1/ The EFI unit is set up to replicate the input from the flow meter that you normally get in the kits.
2/ The Head unit has the logic capability to be adjusted/calibrated for fuel discrepancies.
3/ So, my assumption is that the the EFI module converts the Injector pulses, and pulse widths, into a simple analog signal, that roughly replicated the fuel flow sensor, and the Head unit is calibrated by the user to smooth and refine the differences.
4/ The Head unit wiring incorporates a simple battery backup that retains the calibration in case of power loss.
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Old 07-29-2018, 05:30 AM   #17
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Converting the injector signal to replicate the flow meter does make sense and would explain why you don't need any changes in the head unit.

The one thing I didn't like about the flow unit was the ports were 5/16" when 3/8" was really needed. This EFI unit eliminates that issue completely.
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Old 07-29-2018, 01:17 PM   #18
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Scanned a copy of the ZT4 Instalation Manual...

Took it apart and tried to get the scanner to do it so it would print as a 2 sided doc... not sure if I was successful, but its all there!

See Attached.
Attached Files
File Type: pdf Zemco ZT4 Install.pdf (3.73 MB, 11 views)
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Old 07-29-2018, 01:24 PM   #19
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And the Zemco ZT4 Operation Manual.

See attached.
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File Type: pdf Zemco ZT4 Operation Manual.pdf (1.74 MB, 10 views)
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Old 08-04-2018, 03:54 PM   #20
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Wow, its been strange... the Zemco godfather must be smiling at me!

Picked up a used ZT4 a while back for $20, and it was just the head unit and fuel flow sensor... Figured it might work for an idea I had to watch the fuel consumption of the onboard genset... or dissection or something...

Anyway, with Magnet18 working on duplicating the EFI Module, I figured I would mail it to him to mess with, test or something... but there was no wiring harness or speed sensor, etc. He said cool, he could figure it out.

Then another popped up... used but looked complete.
Made the guy a cheap offer which he accepted.
Click image for larger version

Name:	IMG_6199.jpg
Views:	17
Size:	357.0 KB
ID:	318879

That is heading your way next week Magnet18.

The surprise was hiding in the box...
An opened, but seemingly unused "P/N 4792 Fuel Return Kit".
Probably means nothing to 99.999% of people... but to me, having seen it mentioned in the install manual, I always wondered what it was, how it worked, and if I needed it...

Drum roll.....

Click image for larger version

Name:	IMG_6200.jpg
Views:	16
Size:	252.8 KB
ID:	318878
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Old 08-04-2018, 04:02 PM   #21
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Attached is a scan of the Manual...
#4792 Fuel Return Kit Manual 1.pdf

#4792 Fuel Return Kit Manual 2.pdf
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Old 08-17-2018, 12:20 PM   #22
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The computers showed up today!
I'll get right on it, slotted it in the to do list somewhere below fixing my shower, somewhere above trimming the floor... About on par with getting the engine back in my truck...
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