OK, so why are long life IX better than the OE Denso?

Mine aren't due so no.

 

So that we are clear on this topic, I'm not saying NgK's are better or worse than Denso's, I'm just saying they are just as good even though the Denso's have a .4mm center electrode as compared to the NGK's .7mm. I know that Mafioso is going to do a dyno test and hopefully with his results we can get a definitive answer

 

It was never said to replace them at 30000 miles. I was just saying they should be checked around 30000 miles. The long life NGK's are the Premium Iridiums. NGK wont even list any mileage intervals to check their plugs on there website. I was basing the 30000 off of the denso performance ones intervals just saying I would check them around 30000 just to be safe. I'm trying to find a post I found when researching of a guy who had a set in a Toyota. He had the IX Iridium and after 35000 miles they were shot. If I find it I'll post a link to the post with pics.

 

I think the only difference when you compare the OE Densos and the Long life Premium Iridiums the only difference is a few bucks for 8.

I believe when I researching also I saw that the long lifes and the performance plugs had different size electrodes. So the Denso performance were smaller then the Denso long lifes. Same with the NGKs if you are basing anything on electrode size.

 

Will the dyno be new NGKs against new Densos? Both the long life (premium etc) iridium?

Er, I'm struggling to see the purpose. What is it?

 

Hi Vance, I think I know which post you are referring to regarding the NGK test. By the way that test was done in 07' using the old NGK's iridium plugs not the long life ones which are more expensive due to that reason;so that test would be inconclusive now Yes the NGK's were shot around 30k something miles, I remember seeing the two graphs back then in comparison. That dyno test with the Toyota Supra was done between NGK irdiums not the latest ones vs. the Denso Iridiums.

Till now I haven't seen any test done btw the two latest NGK and Denso iridiums. I hope Mafioso can clear up the whole hoopla btw the two

To JagVa don't worry once the test results are out everything will make sense

 

I'm only vaguely interested TBH.

 

....so if when the time comes what plugs might you choose? NGK or Denso? if I may kindly ask lord JagV8

 

It wasnt a test of anything. It was a guys personal experience with running the IX Iridium performance plugs in a Toyota Tundra. He checked them at 35000 miles and posted up a complaint on a messege board with pics cause he felt they should of lasted longer but they were not the long lifes. They looked pretty bad. That is also why I said I would check them at 30000.

I just picked up the OE Denso long lifes. Stock has lasted this long might as well just refresh them. I am curious how the colder heat range plugs will do with some more power though.

 

Lord, haha I wish!!

I'll almost for sure just put in the OE plugs. If it gets to 200K miles probably do the same again. I should be so lucky.

 

The pdf containing the 1 heat range colder per X horsepower was a NGK document. It also contains recommendations for towing, extended highway driving and boost pressure. Saw it about an hour ago.

NGK is now recommending 1 heat range colder as opposed to what is found in the original vehicle care manual.

The difference electrode diameter difference in the OEM longlife version and the consumer/performance versions of otherwise similar platinum/iriidium plugs can be explained by differing goals. The OEM wants to assure the first buyer that his upkeep costs will be low. This is similar to the sealed for life transmissions. We all know how well that serves the second owner. If service is included in the purchase, it is even more important to be able to say that the plugs will last 120K.

On the other hand, the consumer/performance versions are all about a noticeable improvement on replacement. The smaller diameter electrode fires better for longer but has a shorter life.

So the tradeoff is better spark and shorter life, versus useable spark and longer life.

One anecdotal, but quite clever test involved timing how long an engine cranked before starting with various plugs. No plug took longer than a full second to fire. But, the Denso did the best.

If you think about it, that means at least 1 cylinder got a hot enough spark to fire fastest when on the Denso.

So, three things would come to mind.

1. coils work less when the plug fires easily because they stop outputing energy as soon as the arc is established.

2. the plugs are easy to change compared to other engines that have the plugs buried

3. the platinum/iridium tip configuration is the same, unlike conventional coppers.

With those three things in mind, it would seem that a good plan would be to use the aftermarket platinums, but change at say, 24K to ensure that the plugs are always in the "good" part of their performance curve.

Like oil, YMMV.

 

heat range tests will be coming up soon. MUAHAHAHA!

Once the AFX is installed I'll be trying a couple ranges colder and couple hotter

 

Awwwwwwwwwwwwww yeah!!!!!!!! Finally we can close the chapter on which plug performs better; Denso iridiums vs. NGK iridiums

 

LOL, I am interested at 2 threads

1- Which is the best oil for my car
2- Which spark plug is a better choice

 

Since when do mods pour petrol on the flames????

 

I see no flames (?)

Oil, air filter and spark plug threads are probably the bane of a mod's existence. It seems that the less actual evidence there is that one product is better than another, the more people want to believe that there is. This turns into a rapidly deteriorating desk-pounding less filling/tastes great debate until there's tears or somebody pokes an eye out. Then the mod has to step in and play a big bad old meany and lock the thread.

This one is quite civil I thought. Don't prove me wrong guys!

 

Fingers crossed, then. Er, we're not doing oil here, right?

And just a very specific application of plugs? Not life or anything, but how they work on dyno runs or.... well, what ARE the test parameters?