Actually, spark plugs are pretty much like spark plug wires. No matter what you upgrade to (for a stock engine that is), it won't give you much improvement in terms of performance.
Unless, you have an S/C and you need the colder plugs.
I heard that multi prong spark plugs aren't recommended for old cars because they don't really improve anything, but allot of the new cars nowadays like VW and Audi's come with 3 spark-spark plugs!!?
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My sexy AE92 http://members.cardomain.com/ababan
What do you guys know about multifire plugs?
what stage of modding should i think of putting them in?
I think their main purpose is greater longevity, not better performance. The multiple spark paths won't disappear simultaneously through normal use, so you have until the time all spark paths are exhausted to replace your plugs. For consumers, it means they don't have to worry about their plugs for a very, very long time.
Has anyone tried the iridium spark plug and noticed any difference? Do you think there worth buying?
Unless your car has been tuned for optimal performance you won't notice a difference.
Also, the controversy of copper vs. platinum vs. irdium sparkplugs isn't that significant. If you don't have tuned engine then just get some fair priced plugs.
Irdium ==> tuned engines for max performance
Platinum ==> longitivity, durability
Copper ==> most affordable, but replace every 20000km
Irdium ==> tuned engines for max performance
Platinum ==> longitivity, durability
Copper ==> most affordable, but replace every 20000km
WRONG!
Iridium = ricey product meant to be sold at a high price to idiot buyers (notice, toyota manual says to use copper (sr5) or platinum (GT-S) I'd say they know more). They are made of a rare metal that is ultra hard, so if it seizes in the plug threads, try gettign it out. And they dont work at all better than copper/platinum, they just last longer.
Platinum = Longetivity true, but the gap cant be adjusted as easily as copper plugs, but better than iridium as you cant gap iridium plugs (metal is too hard and fragile).
Copper = Cheapest, yes, and recommended to be used in turbo engines, as the spark travel is most reliable in these.
WRONG!
Iridium = ricey product meant to be sold at a high price to idiot buyers (notice, toyota manual says to use copper (sr5) or platinum (GT-S) I'd say they know more). They are made of a rare metal that is ultra hard, so if it seizes in the plug threads, try gettign it out. And they dont work at all better than copper/platinum, they just last longer.
the new corollas uses iridium spark plugs? what's the deal now?
I'll just stick with the Denso's that came with the car and replace them every 15,000 mi. They are only like $1.25 ea. which is allot better than the $6 bosch quadruple platinum bla bla bla crap they keep trying to get me to buy. I also noticed my denso's are dual side electrode and the sticker on the side of the valve cover says not to use the hook type electrode plugs. But it's funny how the guy at the autoparts place kept wanting to sell me the expensive plugs. When I told him about the sticker on the side of my valve cover tha says only to use a certian type of spark plug he said his computer said these were the acceptable type of plug. I then said will his computer extend my manufact warantee? That when we went outside to look at the sticker and pull out a plug, and thats when I found out the car used denso (non platinum) plugs which turned out to be one of the cheaper plugs avail. The guy at the store never even seen a plug like that and since I never did either I couldn't laugh.
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"I have to much respect for the idea of god to make it responsible for such an absurd world."
From left to right they are colder AND last longer.
Denso Irridium plugs are stock on my '01 and all the newer 'yotas, sooo, I don't think they are "useless ricer crap" or whatever Flashm said. They are the newest and best technology. They last a hell of a lot longer, that is an economical reason to get them. Some claim they will last 100,000 miles.
-Chris
P.S. My advice is to get whatever plugs your car came with unless you are running an aftermarket S/C like Elegant said. PEACE
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