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Old 09-30-2006, 06:03 PM   #1
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spark plugs?

with the following mods what spark plugs would you recommend and at what gap? i heard i'm suppose to gap them differently with the demon coil. thanks!

*ride: 2003 focus SVT ZX3, black exterior, black leather interior with red cloth inserts, HIDs.

*mods: superwhite foglights, alum shorty antenna, steeda intake, 70mm pro-m, 42lb/hr fuel injectors, 65mm throttle body, demon coil w/10mm livewires, 10w30 mobile 1 supersyn oil, chrome 17" SVT rims wrapped in goodyear eagle f1's, diablo predator tuned by tom, 2.5" stainless borla cat-back exhaust, fc offroad pipe, vf rear tranny mount, front fs stress bar, steeda short throw shifter.


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Old 09-30-2006, 06:27 PM   #2
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The gap you can get away with depends more on the wires and what's driving the coil than the coil. I know all the coil places say their coils make more voltage than everyone else's coils...but that's bull. It's like putting "louder" speakers in your car. :) The voltage they put out is more dependent on the cylinder pressure and gap than any special windings. Any modern OE coil will do 50Kv with the right condtions (huge gap and/or high cylinder pressure).

Just increase the gap until you get a misfire, then back it down. That increases the voltage on every coil made. Just keep in mind that as the plugs wear, the gap gets larger...so if you make it just under the misfire, then it'll be at the misfire again as they wear.

At a certain point, the spark will just say "f-it" and go out the wires, across the windings of the coil or out the insulation on the coil to ground. As the voltage increases, it's harder and harder to keep it going where you want it to ... and away from where you don't want it.

If it sounds like a hassle, just leave them at stock gap.

Last edited by turbo joe; 09-30-2006 at 06:34 PM.
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Old 10-01-2006, 09:45 AM   #3
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ok, i have the 10mm livewires.
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Old 10-03-2006, 01:39 AM   #4
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I did an experiment, but keep in mind my car was pretty much stock and i was looking for some free horsepower and i had some time on my hands at work. I was using the WDS at my dealership and hooked up the necessary equipement to monitor the ignitions peak kv and duration in milla seconds. I took note of the duration and peak kv of each cyclinder and removed the plugs and widened the gap until i started to see a fairly noticeable change in the duration. I believe it was around .065-.070" gap. Then i drove it around using the stock plugs and wires and noticed that the car bogged even more of the bottom but felt a little stronger at top end. So i returned them back to about stock which i think is .042" and that bog went away. But like i said my car was pretty much stock with the latest ford pcm calibration. Now that i have a AEM cold air intake that bog has gone away alot.
In conclusion if you have a lower resistant plug wire you should be able to widen the gap around where i was experimenting with. If your car feels more slugish off the bottom like mine did then you may have a too large of plug gap.

Sorry for writing so much but ive been working for 9 hours than was in school for 4 hours to get my smog license and its currently way past my bed time due to too much cofee to stay awake during class which is pretty much review for me.
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Old 10-03-2006, 02:35 PM   #5
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Re: spark plugs?

Quote:
Originally posted by edingeek
with the following mods what spark plugs would you recommend and at what gap? i heard i'm suppose to gap them differently with the demon coil. thanks!

*ride: 2003 focus SVT ZX3, black exterior, black leather interior with red cloth inserts, HIDs.

*mods: superwhite foglights, alum shorty antenna, steeda intake, 70mm pro-m, 42lb/hr fuel injectors, 65mm throttle body, demon coil w/10mm livewires, 10w30 mobile 1 supersyn oil, chrome 17" SVT rims wrapped in goodyear eagle f1's, diablo predator tuned by tom, 2.5" stainless borla cat-back exhaust, fc offroad pipe, vf rear tranny mount, front fs stress bar, steeda short throw shifter.
why in the hell did you put 42lb injectors on your NA motor with only a few "extra breathing mods"? Are you planning on SuperCharging or TurboCharging it soon or what?

Last edited by SVTFsOnIcBlUe; 10-04-2006 at 12:51 AM.
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Old 10-03-2006, 11:30 PM   #6
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Since you have red inserts, I think you can open the gap a little more...ya know, us black/ red guys have slightly more performance!

...I had my gap at .060 with the SD coil and live wires.
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Old 10-04-2006, 08:07 AM   #7
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.060 is the usual max gap people put their plugs at, with .055 being the norm. Any higher and you start noticing problems, like sonicsvtf noted with his .065-.070 gap. Honestly, the only real way to tell what's best is with a dyno and give the gap a .005 increase between each run. You should start noticing a drop-off at high RPMs when the gap gets too large.
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Old 10-04-2006, 02:40 PM   #8
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{Since you have red inserts, I think you can open the gap a little more}

HAHAHHAHAHA that made me laugh for about 10 mins.
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Old 10-04-2006, 06:40 PM   #9
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Well, it was listed as a 'thing' done to the car, so I couldnt resist...
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