LSx coils

grifter679

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Dec 14, 2008
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looks pretty good, Im gonna try to figure out how to mount mine prob next week after I drop my engine back in, fortunately for me I have a FFIM, however I am running the older style LS1 coils with the plug end and coil end on the same side. There are two bosses on the driver side of the cylinder head near the fuel rail which i might use as my mounting location.
 

northwestsupra

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Sep 19, 2006
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Nosechunks;1579953 said:
Wow very nice information!!!

That wiring diagram is slightly confusing to me. Would this be correct:

A: Ignition on power.
B: Ignition signal (positive or negative?)
C: ?
D: Ground

Are those capacitors necessary? If so what is there function?

* A = Coil Primary Ground or aka body ground
* B = Ignition low noise ground from ECU (ground) or aka ecu ground
* C = Ignition digital signal from ECU (+5V)
* D = +12V Supply to Coil Primary
 

northwestsupra

New Member
Sep 19, 2006
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ok so i just made up some brakets for the LS2 coils :) super cheap to, and it was a test of my ghetto abilitys lol parts list

3ft 1/4" fine thread stud $4
8 1/4" nuts $4
2 7/11 Slurpee aluminum straws cut 1 1/2" inbetween coils, and 1" for the end pieces $2
L bracket "pack of 2 with screws" $4
total price = $14

put all that together and do a little eye balling this is what you get :p

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since i knew you all would be asking will the hood close yes it will, with a couple of washers at the hood mount to lift it off of the sexy coil harness i still am making lol

and just for a laugh, these will work just as good as these moroso part# 72395 ls2 brackets priced at $144.99
710-72395.jpg
 

IJ.

Grumpy Old Man
Mar 30, 2005
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northwestsupra;1605345 said:
Well give me a better place too mount them without a ffim or extra long plug wires
3 either side of the 3000 pipe would work, under the intake would be better/cooler.

NTRA08;1605349 said:
Oh i didn't know that.
Yep makes them very attractive for a standalone ECU as they're cheap and have good output.
 

IJ.

Grumpy Old Man
Mar 30, 2005
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Heat rises, it's a furnace up there idling in traffic :(

Under the intake and ues the Vacc Reservoir mounting pad face the Coil outputs up and use straight boots will make the wires short as possible.

I bought a roll of MSD 8.5mm wire and terminals/boots from Summit that were cheap and made my own wires for the LSx in the Mk3.

You can either use the cheap crimper that MSD supply with the wire or by a real set of Crimpers, big advantage is they use removable jaws so one set can do all of your crimping needs short of Milspec stuff.
 

northwestsupra

New Member
Sep 19, 2006
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So I take it that we avoid heat to keep resistance down to get stronger spark and more accurate spark.. correct.

---------- Post added at 07:36 PM ---------- Previous post was at 07:35 PM ----------

How about inbetween the intake and valve cover like above the fuel rail
 

IJ.

Grumpy Old Man
Mar 30, 2005
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Heat will eventually destroy the Coils, in the meantime they won't be "happy" so yeah reduced output..

I try to keep Injectors and Coils as far apart as I can if possible so wouldn't mount them up there.