NGK Iridiums for H22? which heat range?

[Losiracer2]

I want to get new plugs for my H22, something like the Iridiums, since they offer a better burn for the fuel/spark. I live in AZ though, so what heat range should I get? one step colder? so the 6s? or should I go two steps colder? 7s? I was thinking about the NGK ZFR6FIX-11s for now but has anyone had success w/ the other heat ranges?

Or what about the new Denso TT (twin tip) design plug? anyone hear good on those yet?

[illestatus]

i didnt know that they made dif types of iridium spartk plugs, i have ngk iridium thats all i know

[Losiracer2]

i didnt know that they made dif types of iridium spartk plugs, i have ngk iridium thats all i know

well for the regular NGKs they do, for diff. climates and stuff. Since I live in AZ and it gonna get hot really soon, I just want to make sure I'm prepared and stuff.

[owequitit]

I would just either go with the stock range or 1 step colder. I have run both and haven't had much issue with either one. You might notice a slight bit less pinging with 1 step colder, although honestly, I haven't found Phoenix get hot enough to make much of a difference.

[Phempa]

I would just either go with the stock range or 1 step colder. I have run both and haven't had much issue with either one. You might notice a slight bit less pinging with 1 step colder, although honestly, I haven't found Phoenix get hot enough to make much of a difference.

haha, spoken like a true Arizonan.

The hottest temps I've ever experienced were in Phoenix. :P


anywho... does the temperature of the plugs really have anything to do with outside air temperature? I though you just went colder if you were running nitrous or boost (higher combustion temps + lower plug temps = leveling out overall operating temps?)

edit: I'm probably way off on this... I'm no pro mechanic.

[Losiracer2]

yeah pep boys has em for 6.99 a piece so i guess i'll get them from there since they had the best deal in town.

[owequitit]

haha, spoken like a true Arizonan.

The hottest temps I've ever experienced were in Phoenix. :P


anywho... does the temperature of the plugs really have anything to do with outside air temperature? I though you just went colder if you were running nitrous or boost (higher combustion temps + lower plug temps = leveling out overall operating temps?)

edit: I'm probably way off on this... I'm no pro mechanic.

I am from Lake Havasu where 130 is routine. Phoenix doesn't even phase me. We go to Phoenix to cool off.

As for the heat range, it can help when intake air temps are high, as the spark is cooler and thus there is a greater margin between detonation and not detonating, when your IAT's are way up there, which essentially reduces your knock threshold.

The knock sensor should take some care of this, and I have always encountered a small amount of pinging around here in the summer time since they made the switch from 93 to 92 and then 91 octane premium. The H seemed to do a little better with 1 step colder plugs in it in the summer time though, and when I would go back to the regular heat range, the pinging would increase again. This is also a commonly practiced procedure at dealers. I will have to look in helm's but I am pretty sure that is one reason it specifies multiple plug heat ranges.

Apparently, the platinum tipped NGK-R plugs also operate a little more optimally than the regular NGK plugs.