1 step colder plugs?
#1
1 step colder plugs?
i just started getting a really bad misfire at wot so i was going to change out the plugs, should i go with a step colder spark plug? what plugs are you 450whp-500whp guys using?
i was going to buy the denso iriduim - IKH24 for evo9
John
i was going to buy the denso iriduim - IKH24 for evo9
John
#3
Evolved Member
iTrader: (72)
Stay away from the Densos. My locals have nothing but trouble with them. If you have an IX, stick with OEM. For VIIIs, I prefer coppers which should be replaced often. 1 step colder isn't a bad idea, but the stock heat range can support that horsepower with no issues,.
#6
Evolved Member
iTrader: (72)
Like I said above, many of my friends who bought them for their cars had nothing but issues. Two of the cars misfired on idle. A few others misfires in the 5k range, almost as if the plugs went bad. We immediately threw on new oem plugs, and the cars ran perfectly again. A few of my friends are making 500whp on stock plugs. I will stand by OEM for the IX.
Last edited by chu; Jun 16, 2011 at 09:00 AM.
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#8
Evolved Member
iTrader: (25)
I think plugs are a very misinformed technical part which many don't know alot about.
many people are in the 500+hp range on stock plugs... Often times you can visually inspect plugs and try to find the heat ring, discolorment around the prongs to see if you need to go colder from stock as the ring moves closer and closer to the tips.
Misfires can happen from many reasons and can be compensated by changing plugs, but if your below the 500hp range on stock plugs and have issues, odds are IMO you may have another issue. (tired coil, bad ground, something like that)
many people are in the 500+hp range on stock plugs... Often times you can visually inspect plugs and try to find the heat ring, discolorment around the prongs to see if you need to go colder from stock as the ring moves closer and closer to the tips.
Misfires can happen from many reasons and can be compensated by changing plugs, but if your below the 500hp range on stock plugs and have issues, odds are IMO you may have another issue. (tired coil, bad ground, something like that)
Last edited by GTijoejoe; Jun 16, 2011 at 10:29 AM. Reason: misread a post
#9
Evolved Member
iTrader: (72)
I think plugs are a very misinformed technical part which many don't know alot about.
many people are in the 500+hp range on stock plugs... Often times you can visually inspect plugs and try to find the heat ring, discolorment around the prongs to see if you need to go colder from stock as the ring moves closer and closer to the tips.
Misfires can happen from many reasons and can be compensated by changing plugs, but if your below the 500hp range on stock plugs and have issues, odds are IMO you may have another issue. (tired coil, bad ground, something like that)
many people are in the 500+hp range on stock plugs... Often times you can visually inspect plugs and try to find the heat ring, discolorment around the prongs to see if you need to go colder from stock as the ring moves closer and closer to the tips.
Misfires can happen from many reasons and can be compensated by changing plugs, but if your below the 500hp range on stock plugs and have issues, odds are IMO you may have another issue. (tired coil, bad ground, something like that)
#11
Evolved Member
why wouldnt u use densos? it could be there tune wasnt good and those plugs u put in didnt improve, i know from swapping my ngk bpr8es, for denso iw24 plugs...for the most part my car drives better even not being retuned after a copper to iridium one step colder swap...the idea of changing your copper plugs almost as much as an oil change isnt worth the 10, after 4 oil changes ur at the same price as a set of iridiums which u can go 30k plus on them...mine came pregapped at .024...no problems there pushin 26 psi peak on 91 octane.
#13
Evolved Member
iTrader: (72)
why wouldnt u use densos? it could be there tune wasnt good and those plugs u put in didnt improve, i know from swapping my ngk bpr8es, for denso iw24 plugs...for the most part my car drives better even not being retuned after a copper to iridium one step colder swap...the idea of changing your copper plugs almost as much as an oil change isnt worth the 10, after 4 oil changes ur at the same price as a set of iridiums which u can go 30k plus on them...mine came pregapped at .024...no problems there pushin 26 psi peak on 91 octane.
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