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Old 02-22-2004, 12:17 AM   #1
Hit Man X
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Default Iridium or Double Pt plugs?

I'm going with a set of NGKs here and need some feedback on them. Iridiums are a bit cheaper than the Double Pt's but which would you go with?

I am going to go one heat range cooler too.

Thanks for any info/tips...
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Old 02-22-2004, 10:14 AM   #2
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Do not use platinum plugs in turbo motors.

Also, there is no advantage to changing the heat range, in your case. You would only do that if you were changing the boostlevel significantly, like over 22 or 23psi, and even then, it still wouldn't make a difference. With colder plugs, you'll actually have worse performance because you'll be fouling the plugs pretty often.

For the iridiums, some guys swear by them. In reality, they make no difference at all. Its a bit of voodoo really.

I would just save the money and buy regular NGKs. Spend your money on something you'll be able to notice the difference on.

Kyle
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Old 02-22-2004, 04:19 PM   #3
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Mkay, looks like I'll stay with the standard heat range then. Thanks!
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Old 02-22-2004, 04:45 PM   #4
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There have been SEVERAL, LOTS, MANY threads on sparkplugs in tha last month. A search will yeild hours of reading on sparkplugs, most of which will refute what Kyle has to say.
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Old 02-22-2004, 05:43 PM   #5
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Just the opposite, in fact. I've done a search my self and there's basically nothing, except for a few threads where you seem to have an opinion.

http://forums.nasioc.com/forums/show...hreadid=505746

http://forums.nasioc.com/forums/show...hreadid=500495

If you go to the NGK website, they are actually quite clear about it. You don't even need to consider changing your heat range untill you are running at least 75-100 hp more than stock and even then, you might still be okay just shortening the gap to acommodate the denser air/fuel mixture.

In a street car, running colder plugs is not going to make a bit of difference other than they will foul sooner and having fouled plugs ends up making you worse off than if you used the hotter plugs. IF your car is tuned that close to the ragged edge for that extra little bit of mAd PoW3r, then you are going to blow up your motor from a multitude of different reasons other than the spark plugs.

K.
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Old 02-22-2004, 06:52 PM   #6
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Quote:
Originally posted by Uncle Scotty
There have been SEVERAL, LOTS, MANY threads on sparkplugs in tha last month. A search will yeild hours of reading on sparkplugs, most of which will refute what Kyle has to say.


Yes, I did not ask what plugs are for me... I simply asked what'd be a better quality plug the Pt or Iridium. The Pt is no bueno, so I'll be getting stock heat ranged Iridiums. We got off topic on heat ranges which isn't bad but not my question in the least bit.

I've had good luck in domestic V8 motors with copper plugs as they are a bit cheaper than Iridiums... I think I can get myself to drop $7/plug x 4 for $28 than $7/plug x 8 for $56!
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Old 02-22-2004, 06:58 PM   #7
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Yes I do, and for reasons that have been aired many times.
I have read MANY things, not just NGK's site and have learned quite a bit as an aircraft mechanic as well.

Even as rich as our cars run, I have rarely heard of fouling unless other issues are involved.
A colder plug transfers more heat to the head from the combustion chamber and increased boost makes more heat and depending on what turbo is being used this, can be considerable at only a few psi over stock.

So.....All else considered, any boost increase over stock, and the use of a colder plug may keep the plug from hot spotting and causing problems.

I use IK22 Denso's
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Old 02-22-2004, 11:27 PM   #8
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Quote:
Originally posted by Hit Man X
Yes, I did not ask what plugs are for me... I simply asked what'd be a better quality plug the Pt or Iridium. The Pt is no bueno, so I'll be getting stock heat ranged Iridiums. We got off topic on heat ranges which isn't bad but not my question in the least bit.

I've had good luck in domestic V8 motors with copper plugs as they are a bit cheaper than Iridiums... I think I can get myself to drop $7/plug x 4 for $28 than $7/plug x 8 for $56!
Sorry. To answer your question- iridium over platinum. Stay away from platinum. Iridium is probably of little value over copper. You can try colder plugs if you like. If you're cranking your boost way up, it will eventually be a good idea.

If your using the plain 'ole 2-dollar coppers then you can try out the colder plugs and not feel bad about it.

K.
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Old 02-22-2004, 11:36 PM   #9
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Quote:
Originally posted by kyledooley
Sorry. To answer your question- iridium over platinum. Stay away from platinum. Iridium is probably of little value over copper. You can try colder plugs if you like. If you're cranking your boost way up, it will eventually be a good idea.

If your using the plain 'ole 2-dollar coppers then you can try out the colder plugs and not feel bad about it.

K.

Cranking boost to what? I'm at ~ a TXS Stage 2 + Uppipe, so is that considered cranking?
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Old 02-23-2004, 01:40 AM   #10
kyledooley
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Like I was mentioning above, 75-100hp plus before you even consider it. If you go by the turbo xs dyno plots on their site, you're only talking 50hp gain at the very most, so you aren't really even close.

I would be gapping your plugs down though to the lower end of the recommended gap. This just ensures you have good spark across the gap. If your gap is too large, it makes it harder for the spark to cross the gap through the more dense air/fuel mixture.

K.
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Old 02-23-2004, 01:53 AM   #11
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Actually, boost causes spark 'blow out' and gapping a bit closer helps prevent this.
The ignition system on the WRX is very good...it is one of the things that almost never has problems, other than blown coilpacks
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