Best Spark Plug for good price $$$
Apr 16, 2003, 06:19 AM
#16
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Originally posted by Guack007
What specifically do you "DSM Guys" have against the boshe 4+ platinum and denso iridium plugs. Please dont post "they suck" I'm trying to learn something new here.
What specifically do you "DSM Guys" have against the boshe 4+ platinum and denso iridium plugs. Please dont post "they suck" I'm trying to learn something new here.
Iridium ones are fine, so I don't know the reason why they aren't recommended. I do know that they are expensive though.
Apr 16, 2003, 06:23 AM
#17
Platinum isn't as good a conductor of electricity as copper is. Platinum plugs simply don't fire worth a damn in a high pressure engine like ours.
Platinum is added to the ends of the electrodes simply for longevity. But they actually perform worse than a normal copper plug.
Platinum is added to the ends of the electrodes simply for longevity. But they actually perform worse than a normal copper plug.
Apr 16, 2003, 10:30 AM
#18
The stock plugs for the Evo are NGK IGR7A-G. According to the Evo repair manual, at least. 
They are iridium plugs with a platinum ground electrode.
This doesn't mean that a copper plug won't work just as well. But a copper plug definitely won't last as long. I change my plugs at least twice a year.
They are iridium plugs with a platinum ground electrode.
This doesn't mean that a copper plug won't work just as well. But a copper plug definitely won't last as long. I change my plugs at least twice a year.
Apr 16, 2003, 10:31 AM
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Originally posted by ShapeGSX
The stock plugs for the Evo are NGK IGR7A-G. According to the Evo repair manual, at least.
They are iridium plugs with a platinum ground electrode.
This doesn't mean that a copper plug won't work just as well. But a copper plug definitely won't last as long. I change my plugs at least twice a year.
The stock plugs for the Evo are NGK IGR7A-G. According to the Evo repair manual, at least.
They are iridium plugs with a platinum ground electrode.
This doesn't mean that a copper plug won't work just as well. But a copper plug definitely won't last as long. I change my plugs at least twice a year.
Where have you seen the EVO repair manual?
Apr 16, 2003, 10:46 AM
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Originally posted by Guack007
What specifically do you "DSM Guys" have against the boshe 4+ platinum and denso iridium plugs. Please dont post "they suck" I'm trying to learn something new here.
What specifically do you "DSM Guys" have against the boshe 4+ platinum and denso iridium plugs. Please dont post "they suck" I'm trying to learn something new here.
Apr 16, 2003, 11:03 AM
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Originally posted by Infinity
Platinums suck...hehe, no. Platinums run hot, really hot and you don't want that hotness in a forced induction car that's already running hot. Platnium doesn't conduct electrcity that well either, Iridiums run basically like platniums, waste of money, they run hot and they don't do a good job at sparking.
Platinums suck...hehe, no. Platinums run hot, really hot and you don't want that hotness in a forced induction car that's already running hot. Platnium doesn't conduct electrcity that well either, Iridiums run basically like platniums, waste of money, they run hot and they don't do a good job at sparking.
Where is your (dis)information coming from?
Last edited by seattle944t; Apr 16, 2003 at 11:05 AM.
Jul 8, 2003, 05:08 AM
#23
Replacing the plugs with Copper NGKs costs $10. It takes 10 minutes. So why not try them out?
If you have already worn out the Iridiums, then I'd definitely get the coppers. Who wants to spend that much money on spark plugs every 3 months?
If you have already worn out the Iridiums, then I'd definitely get the coppers. Who wants to spend that much money on spark plugs every 3 months?
Jul 8, 2003, 05:08 AM
#24
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Originally posted by CornerHard
Copper NGKs are cheap and all you need .028-.030in spark plug gap on DSMs (though I'm guessing the Evo starts at .028 
).
Copper NGKs are cheap and all you need
.028-.030in spark plug gap on DSMs (though I'm guessing the Evo starts at .028 ).
-Shahul
Jul 8, 2003, 04:30 PM
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don't want to add fuel to fire.. but hope the former/current DSM owners DON'T compare their engines to the evo's .. they are DIFFERENT even though they share the same code.. Standard VII/VIII comes with iridiums, the twin coil wasted sparks generate ALOT less energy than you would believe (if you don't believe me, gap your plugs at 0.9mm vs the recommended 0.8mm or less)..
You really can use the cheaper plugs .. you lose power plenty fast too.. then again .. if you look at the service manual .. the stock plugs last longer than the standard copper plugs in the normal cars .. comparative
Anyway .. there's another type of plug which you can consider .. its the wire style plugs .. ralliart/hks/denso all makes it .. and they are expensive .. but there's a US made plugs which I think it's called turboplugs and these go for $40 a set ..
You really can use the cheaper plugs .. you lose power plenty fast too.. then again .. if you look at the service manual .. the stock plugs last longer than the standard copper plugs in the normal cars .. comparative
Anyway .. there's another type of plug which you can consider .. its the wire style plugs .. ralliart/hks/denso all makes it .. and they are expensive .. but there's a US made plugs which I think it's called turboplugs and these go for $40 a set ..
Jul 8, 2003, 05:00 PM
#28
Originally posted by gunzo
don't want to add fuel to fire.. but hope the former/current DSM owners DON'T compare their engines to the evo's .. they are DIFFERENT even though they share the same code.. Standard VII/VIII comes with iridiums, the twin coil wasted sparks generate ALOT less energy than you would believe (if you don't believe me, gap your plugs at 0.9mm vs the recommended 0.8mm or less)..
don't want to add fuel to fire.. but hope the former/current DSM owners DON'T compare their engines to the evo's .. they are DIFFERENT even though they share the same code.. Standard VII/VIII comes with iridiums, the twin coil wasted sparks generate ALOT less energy than you would believe (if you don't believe me, gap your plugs at 0.9mm vs the recommended 0.8mm or less)..
The twin wasted spark ignition on a DSM works just fine at 27psi of boost, generating over 500hp with copper spark plugs at 0.028" gap.
So the Evo's coils suck, but the DSM coils rule? I find that hard to belive since the Evo just about has a coil on plug setup.
Jul 8, 2003, 06:39 PM
#29
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the heat range of the plug determines how "hot" or "cold" they run (which refers to how quickly they extract heat from the combustion chamber.
Iridium plugs work well as they are good conductor of electricity, yet are very hard, so they ofer a good service life even at high bosot levels. We use them for the WRX's alot, as the copper ones in 1 step "colder" are nearly impossible to find..I can look up the Denso Iridiums for the Evo tomorrow and post here if you guys want. A big benfit many cite with the iridiums is they can be gapped wider 9more efficient spark) yet still fire at a solid level.
Any coil on plug setup is good.....they are about the highest capacity ignition units you can get, and should be able to fire well to at least 8500 rpm or so (estimation only..someone like Shiv would know better though).
At the end of the day, if you ask 10 people this question, you'll get 20 answers, so do the research, learn teh facts, speak to people who run various combos, and then buy accodrdingly.
happy boosting
Iridium plugs work well as they are good conductor of electricity, yet are very hard, so they ofer a good service life even at high bosot levels. We use them for the WRX's alot, as the copper ones in 1 step "colder" are nearly impossible to find..I can look up the Denso Iridiums for the Evo tomorrow and post here if you guys want. A big benfit many cite with the iridiums is they can be gapped wider 9more efficient spark) yet still fire at a solid level.
Any coil on plug setup is good.....they are about the highest capacity ignition units you can get, and should be able to fire well to at least 8500 rpm or so (estimation only..someone like Shiv would know better though).
At the end of the day, if you ask 10 people this question, you'll get 20 answers, so do the research, learn teh facts, speak to people who run various combos, and then buy accodrdingly.
happy boosting
Jul 9, 2003, 07:26 AM
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Originally posted by Z1 Performance
the heat range of the plug determines how "hot" or "cold" they run (which refers to how quickly they extract heat from the combustion chamber.
Iridium plugs work well as they are good conductor of electricity, yet are very hard, so they ofer a good service life even at high bosot levels. We use them for the WRX's alot, as the copper ones in 1 step "colder" are nearly impossible to find..I can look up the Denso Iridiums for the Evo tomorrow and post here if you guys want. A big benfit many cite with the iridiums is they can be gapped wider 9more efficient spark) yet still fire at a solid level.
Any coil on plug setup is good.....they are about the highest capacity ignition units you can get, and should be able to fire well to at least 8500 rpm or so (estimation only..someone like Shiv would know better though).
At the end of the day, if you ask 10 people this question, you'll get 20 answers, so do the research, learn teh facts, speak to people who run various combos, and then buy accodrdingly.
happy boosting
the heat range of the plug determines how "hot" or "cold" they run (which refers to how quickly they extract heat from the combustion chamber.
Iridium plugs work well as they are good conductor of electricity, yet are very hard, so they ofer a good service life even at high bosot levels. We use them for the WRX's alot, as the copper ones in 1 step "colder" are nearly impossible to find..I can look up the Denso Iridiums for the Evo tomorrow and post here if you guys want. A big benfit many cite with the iridiums is they can be gapped wider 9more efficient spark) yet still fire at a solid level.
Any coil on plug setup is good.....they are about the highest capacity ignition units you can get, and should be able to fire well to at least 8500 rpm or so (estimation only..someone like Shiv would know better though).
At the end of the day, if you ask 10 people this question, you'll get 20 answers, so do the research, learn teh facts, speak to people who run various combos, and then buy accodrdingly.
happy boosting
NGK coppers with a heat range lower, Vishnu sell them on there site.
Eric