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Old 03-09-2006, 11:19 AM   #1
bcblues
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Default Correct Spark Plug for AI/WI?

Is it better to go with a cooler plug when running WI/AI? Or best to go with the stock heat range?
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Old 03-09-2006, 11:21 AM   #2
scooby24
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I went one step colder on mine and didn't have any issues. WI is pulling more heat out by itself so theoretically you should be able to go UP a heat range...but there's no need to.

Honestly I'd stick with stock heat range.
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Old 03-09-2006, 11:28 AM   #3
bcblues
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That may be best for me. I live in the frigid tundra of America's Outback, where you can see your breath most of the year No, seriously, here in North Dakota, it gets WICKED cold in the winter (at times 30 degrees below zero - F), but it also gets WICKED hot in the summer (100+). With the WI/AI, I would think that you are already pulling out a bunch of heat, and that stock heat range would probably work best, at least with my stock turbo setup).
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Old 03-09-2006, 12:19 PM   #4
Ultimate Collision Center
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Stock or one step colder, usually stock will be fine
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Old 03-09-2006, 12:36 PM   #5
japslapr
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What do you guys gap your plugs at? I dropped mine down to 35
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Old 03-11-2006, 01:58 PM   #6
Blennophobic
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Quote:
Originally Posted by japslapr
What do you guys gap your plugs at? I dropped mine down to 35
Down to 35? Or did you mean down to 0.025"?

Stock plug gap is 0.028-0.030" which is where mine is still.
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Old 03-14-2006, 06:09 PM   #7
japslapr
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damn... plugs on my Grand Prix were at .055. Dropped them down .035 for the spray.
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Old 05-30-2006, 10:56 AM   #8
offset
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Bumping a slightly old thread. Does anyone else have any opinions on this? If I have roughly a stage 2 setup on an STi and I go to a 50/50 mix, is there benefit to one step colder plugs?

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Old 05-30-2006, 11:56 PM   #9
banzai
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in my expirence, i have had to gap mine down a hair, next time they come out, i will gap to .023 ish, and these are one step colder iridiums.

the denser the charge in the cylinder (the more boost, fuel, and alky) there is you either need to retard timing, or shorten the plug gap, otherwise the spark will not be able to jump the gap and you will 'blow out the spark.'

saying that you're blowing out the spark is not correct, as the spark does not even jump, the mixture is too dense and thus offers too much electrical resistance for the spark to jump the gap, to correct this yiou either need to narrow the gap or run a higher energy ignition (more voltage) since it's not cost effective to get a higher energy to our ignition systems, the answer is to run a narrower gap.
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Old 08-17-2007, 01:23 AM   #10
djerickd
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bump!!
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Old 08-19-2007, 10:25 PM   #11
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it really depends on a lot of variables, most people get away with just one step colder but others have to also gap them down a bit...
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