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Iridium Spark Plug heat range?

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Old 12-15-2009, 06:54 AM
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Iridium Spark Plug heat range?

I want to get some iridiums for my engine since I'm due to change them. I watched bythabay video on changing the plugs and he suggested getting one step colder plugs. Can some one explain the benefit?

2003 coupe n/a intake and catback exhaust
Old 12-15-2009, 09:37 PM
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Don't know if this helps much, but this is what the manual says:

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Old 12-15-2009, 09:58 PM
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cold plugs it is
Old 12-15-2009, 10:05 PM
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Mine is due for a plug change too and I was considering the cold ones as well since I do a 70+ mile commute every day.
Old 12-15-2009, 10:13 PM
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so i googled the cold heat range for us and i read alot stating that it's not a good choice for us unless we are modded. So, f--k it i'm going to use the regular. lol. although i do appreciate all the help. here's a link to them on ebay for $41
Old 12-17-2009, 10:37 PM
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im running ngk iridiums at stock temp, you should be fine unless you have a fair amount of modding done. this was what my stock plugs looked like at about 52k

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i think the the burning on the insulator was from the advance im running. the iridiums have cured my misfires and the engine revs much smoother now

Last edited by arsine; 12-17-2009 at 10:49 PM.
Old 12-18-2009, 05:53 AM
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Thanks for posting up that information. It helps alot cause I have a very slight misfire.
Old 12-19-2009, 12:13 PM
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Who is running one-step colder heat range plugs around here? I was under the impression its mostly just the FI guys.

Any NA guys running these?
Old 12-19-2009, 01:10 PM
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Unless you're running nitrous, FI, or other mods that greatly increase the compression of the engine, you don't need colder temp plugs.

The only reason to use colder plugs is that they lower thermal impedance and will run a bit cooler. In an engine that is running excessively hot, this will prevent "hot spots" from forming on the sharp points of the spark plug which can ignite fuel and create detonation (knocking)

If your engine is close to stock (with just the typical NA bolt on mods), you don't need them.
Old 12-21-2009, 01:30 AM
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what mods would make it necessary for going to 1-step colder aside from FI?

I've got about every mod possible for NA without going into the motor (heads/rods/cams/etc)

What about Las Vegas/Phoenix and hot climates?
Old 12-21-2009, 10:33 AM
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pull your plugs and take a look at them. burnt insulators are a sign that you need to upgrade your plugs
Old 12-22-2009, 09:46 AM
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You dont need to do thos unless your FI. Its only to prevent detonation.
Old 12-22-2009, 10:19 AM
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Quote:
Originally Posted by 350 Rookie View Post
You dont need to do thos unless your FI. Its only to prevent detonation.
Well, its not only for FI. If you NA mods which really increase the compression or power of the engine, you will benefit just the same. However, unless your NA mods are adding more than 100hp power, you probably don't need them.
Old 12-22-2009, 12:04 PM
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i'm wondering if in Phoenix, with the mods that I have, if they would have been beneficial...
Old 12-22-2009, 12:08 PM
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Run the car hard in the heat while doing a cipher/autoenguinty etc data log on your ign. If there det, you should be seeing irregularities in the timing curves?

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350z, colder, cooler, driver, engine, g35, heat, heatrange, iridium, na, ngk, plug, plugs, range, spark, upgrade, whats
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