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Old 01-25-2008, 09:11 PM   #61
svtfocusmansvt
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If you have the stock wires and coil pack stay @ stock gap. For nitrous you must run copper (but only lasts nearly 5k or so on fuel injected / electronic ignition type vehicles) AZFS22C is whats needed (get from Ford) but if what everyone is saying it true on the price go with C-F-M, in theory for every 50 HP run 1 heat range COLDER. Those plugs are copper plugs and are actually for the ZX3 2.0 @ 1 heat range difference. If you have a Turbo then things change.
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Old 01-25-2008, 09:17 PM   #62
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what about the ITV22 denso Iridiums and close the gap to .044????
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Old 01-25-2008, 09:27 PM   #63
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Stock Focus = IVT20
SVT Focus = IVT24
I have no idea what the IVT22 is for or what heat range its at, if its the same size plug, I would assume its not the correct heat range for the fact the higher the number the lower the heat, but thats just assuming the 24 is the colder and the 20 is 1 hotter. For nitrous you need to run copper to get the most from it, iridium may be too hot also for the nitrous. Bottom line is AZFS22C and no problems will happen, I have 44k on mine and runs as good as new, I've had my fair share of plugs but compression and all is GREAT.
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Old 01-25-2008, 09:46 PM   #64
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There is no "step" when rating spark plugs; it's just a term thought up by what seems to be the majority of people who don't know what the actual heat ranges of the plugs are.

If you want, you can equate the Denso numbers as "steps." ITV20 is stock, 22 is 1 step colder, 24 is two steps colder, etc. Just keep in mind, there is no definition of a "step."

Furthermore, the Screamin Demon ignition coil puts out nearly identical voltage as the stock ignition coil, and I've proven that the LiveWires are horribly inefficient compared to a good wire like Taylors. To expand on this, no stock replacement ignition coil "needs" a specific plug gap. As long as you can get a consistent spark, you can gap the plugs as far apart as possible. On a stock SVTf, this is typically between .060" and .065". On a boosted motor, it is significantly lower: more like .040". You will also need a colder heat range plug. In order to increase the gap for better combustion while boosting, you need to upgrade the entire ignition system.
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Old 01-25-2008, 09:54 PM   #65
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I disagree have you actually tested the secondary voltage with a DVOM? As far as steps goes you are correct every company is different, but the SVT is only 1 heat range difference than the standard. Also the hotter the coil the more thats allowed to gap which increases the combustion of the plug, so yes you could stay @ the stock gap but can increase with a higher number to a point of loss. On boosted I could see that cause the lower compression and retarted timing. A screamin demon is an upgraded ignition, every system can only get the 12v reference its the output that changes. That doesnt answer my question to can it be gapped and what preferred. Heat range is too hot = holes in pistons. And the heat range change per 50 is also a major deal.
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Old 01-26-2008, 07:27 AM   #66
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Iridium plugs shouldnt be regapped... they are fragile and tend to both flake and break.... Personally I think they are way over rated.

The only time you should regap plugs is when you start getting spark blowout... usually caused by alot of boost or a large shot of nitrous. The bigger the gap the more power you will make so you should run as large a gap as possible (without getting blowout)

The majority of boosted Foci run the AZFS22C plugs and they work great up to 720whp (that we know of) and we dont worry about heat ranges or upgrading the coil.... usually we just do plugs and wires and run the stock coil (which does a great job)
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Old 01-26-2008, 10:53 AM   #67
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A Screamin Demon is not an upgraded ignition; it's a piece of garbage. An MSD DIS-2 is an upgraded ignition.
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Old 01-26-2008, 11:16 AM   #68
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I own a 2004 zx3 and I just changed the spark plugs and I am thinking of chainging the spark plugs wires as well. what do you think about the ebay spark plugs? are they any good? are they to cheap to be true?.

http://cgi.ebay.com/ebaymotors/FORD-...spagenameZWDVW
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Old 01-26-2008, 11:22 AM   #69
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Taylor Thundervolts are my recommendation. jegs.com or summitracing.com
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Old 01-27-2008, 07:58 PM   #70
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MSD Wires are really good and if the coil starts going bad i would prolly get the ACCEL 4-Tower coil, but thats only if i had to change the stock one, cause i tried the MSD and there was no difference on the car other than the fact it wouldnt stay plugged in and i would be cruisin down the road and the car would skip a beat and shut off from not having any fire
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