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ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I'm planning out my wiring harness installation, and need some quick help regarding how the coil packs and injectors need to be wired up. The DTAFast S60 Wiring guide indicates that the injectors and coils should be connected to fused (and switched) 12V. My question is, how is this most commonly done? Let's assume I'm using a Ford EDIS coil pack (or something almost identical). What size fuse do I need, and do I just fuse the whole pack or each coil individually? Same thing on the injectors, do I have a single circuit for all 4 injectors and put them on one fuse, or fuse them individually?
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erstwhile owner of just about every 924 variant ever made

Rich H · Posted: Thu Aug 13, 2009 1:53 am Post subject:

Mine all ran through 2 fuses, one per bank of injectors and another for the single coil IIRC.

Fusing each individually would be the best but probably overkill. As for fuse size I think I used 3A in all cases.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Thanks Rich...so follow up, did you use inline fuses, or were they on a fuse panel?
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erstwhile owner of just about every 924 variant ever made

Rich H · Posted: Thu Aug 13, 2009 2:53 am Post subject:

I used a mini fuse board with 4 standard auto fuses, one for the coil, one for e the injectors and one for MS/Innovate WB
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

pocketscience · Posted: Thu Aug 13, 2009 7:47 am Post subject:

I'm soft so used the MegaSquirt Relay Board... easy peasy.

G.
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Hmmm...it doesn't look like the MS relay board has any fuses at all for the injectors or coils...
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erstwhile owner of just about every 924 variant ever made

pocketscience · Posted: Thu Aug 13, 2009 7:54 am Post subject:

It has a main fuse, a fuel pump, and then INJ1 and INJ2 fuses - 4 in total. Mini-ATO fuses.

G.
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

xpernet · Posted: Thu Aug 13, 2009 7:55 am Post subject:

I followed the diagram from MS's website. Should be similar for your setup as well... Fused the main wire that feeds everything... then fused each injector bank and only one fuse for main power for coil pack.

The MS board it self doesnt have any fuses at all... i think the relay board does which is a separate component.
_________________
1977 Porsche 924
Sunroof Delete
Megasquirt II EFI & EDIS
Carrera GTS / 944 Body

"If one does not fail at times, then one has not challenged himself." Ferdinand Porsche

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

_________________
erstwhile owner of just about every 924 variant ever made

xpernet · Posted: Thu Aug 13, 2009 7:59 am Post subject:

small black rectangles are ATS fuse blocks... damn i shud have bought the relay board lol.
_________________
1977 Porsche 924
Sunroof Delete
Megasquirt II EFI & EDIS
Carrera GTS / 944 Body

"If one does not fail at times, then one has not challenged himself." Ferdinand Porsche

pocketscience · Posted: Thu Aug 13, 2009 10:23 am Post subject:

_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

OK, cool, this helps. Hmm. I'll probably end up making my own fuse / relay panel for my EFI setup since I am very heavily leaning toward the ISIS system for everything else...
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erstwhile owner of just about every 924 variant ever made

Min · Posted: Fri Aug 14, 2009 5:56 am Post subject:

I fused the power lead on my EDIS coilpack, thats it. I did the typical two banks two fuses thing for my injectors, I just did inline fuses for everything, I tried to keep them all near each other so it was easy to check/change them.

http://www.megamanual.com/ms2/v3ext_wiring.gif

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Thanks Min...
_________________
erstwhile owner of just about every 924 variant ever made

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

OK, a couple of more follow up questions.

On the wiring diagram for my DTA S60, it doesn't depict the ignition module, only the coil pack. So, I'm confused, do I need the EDIS ignition module or just the coil pack?
The DTA S60 can run crank sensor with a Hall effect pickup as well as a VR type. Is there anything special I need to do with the trigger wheel to use a Hall effect pickup, or will it work with a plain old 36-1 EDIS trigger wheel? From what I've read, the Hall sensors have much better signal, which is why I'm considering it.
You guys that are running EDIS systems, have you done anything to upgrade the plug wires, or are you just running stock wires?

That's all for now...I'll probably have more soon

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erstwhile owner of just about every 924 variant ever made