Spark Plugs - Colder Plugs - Heat Ranges
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Spark Plugs - Colder Plugs - Heat Ranges
List of spark plugs available in multiple heat ranges for the VQ35:
Brand-------------------Stock #-----------Heat Range
NGK Iridium
LFR5AIX-11---------- 4469------------- Stock heat range
LFR6AIX-11---------- 6619-------------1 step colder
LFR7AIX--------------2309-------------2 steps colder
NGK V-power (standard plug)
LFR5A-11------------- 6376-------------Stock heat range
LFR6A-11------------- 3672-------------1 step colder
Denso Iridium
IKH16------------------------------------Stock heat range
IKH20------------------------------------1 step colder
IKH22------------------5345-------------2 steps colder
IKH24------------------5346-------------3 steps colder
IKH27------------------------------------4 steps colder
I searched the threads, but could not find one location of reference for spark plugs. These are just the ones that I did research on. However, if you know of more plugs, please let us all know!
Brand-------------------Stock #-----------Heat Range
NGK Iridium
LFR5AIX-11---------- 4469------------- Stock heat range
LFR6AIX-11---------- 6619-------------1 step colder
LFR7AIX--------------2309-------------2 steps colder
NGK V-power (standard plug)
LFR5A-11------------- 6376-------------Stock heat range
LFR6A-11------------- 3672-------------1 step colder
Denso Iridium
IKH16------------------------------------Stock heat range
IKH20------------------------------------1 step colder
IKH22------------------5345-------------2 steps colder
IKH24------------------5346-------------3 steps colder
IKH27------------------------------------4 steps colder
I searched the threads, but could not find one location of reference for spark plugs. These are just the ones that I did research on. However, if you know of more plugs, please let us all know!
Last edited by done12many2; 01-09-2006 at 12:59 PM.
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what can you tell me about the pros and cons of going to a 1 step colder plug as opposed to the stock heat range?
I want to get the NGK Iridium plugs but I have no idea which level in the heat range that I should get. Can anyone help me?
gracias
I want to get the NGK Iridium plugs but I have no idea which level in the heat range that I should get. Can anyone help me?
gracias
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Originally Posted by zzz350
what can you tell me about the pros and cons of going to a 1 step colder plug as opposed to the stock heat range?
I want to get the NGK Iridium plugs but I have no idea which level in the heat range that I should get. Can anyone help me?
gracias
I want to get the NGK Iridium plugs but I have no idea which level in the heat range that I should get. Can anyone help me?
gracias
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Originally Posted by Z1 Performance
technically an IKH20 is 2 steps colder than stock...though I don't think they make an IKH18
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Originally Posted by done12many2
If you are lightly modded or stock you don't need to worry about colder plugs. Just get LFR5AIX-11---------- 4469------------- Stock heat range if you want the NGK Iridiums.
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Originally Posted by zzz350
thanks for the quick response, I'm off to ebay. Sparkplugsource has these plugs (6) for $38, yes they are new NGK, awesome.
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I am lost.. I some some n/a mods , I had seen 1 degree cooler really helped hp from another member , I cant remember what mods or or was FI. What would help me with my mods and can I get these at auto parts? I was about to go get some Iridium plugs like my father put in his Jag, but now I am confused someone please help? I want to get them today and change tonight. I want a long lasting plug that will help my performance any ideas.
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just use the stock heat range...there is absolutely zero need for colder plugs with typical bolt ons
the colder plug is not what is helping the guys...the fact that their old plugs need replacement is where they are seeing any "gains"
the colder plug is not what is helping the guys...the fact that their old plugs need replacement is where they are seeing any "gains"