NGK Irridium Plugs

[special--k]

just baught these. Then i was reading a post on here where someone said they are no good?
but did not give any reasons why. Should i return these, before i install them?
Info would be great.

http://www.store.partsdinosaur.com/media/Iridium2NGK.jpg

[i like speed]

They smoothed out starting, idle and take off for me.

[KrayzieFox]

I used them before in my P5 and they were great at first. Easier cold starts and a little smoother idle but fouled up and caused insane hesitating and bucking after only about 1,000 miles. I haven't recommended them to anyone since.. especially considering they're ~$7 a plug.

When I replaced them with the ZFR6F-11 V-Power platinums, all has been fine since.

[sean22306]

v-power's are copper not platinum :P

[KrayzieFox]

Whoops, good catch.. I meant copper. Regardless, the V-powers work like a charm in ours cars and they're a lot cheaper.

[KZL_99ES]

i've never had any problem with them, i think that they help out a lot too!

[hominemodi]

what i heard is NGKs are not gapped (or not gapped right), and you can't gap iridium 'coz it's ultra thin and brittle as hell. Denso ones are gapped; unless you can confirm the gap is legit i would return and get the Densos.

[special--k]

That... doesnt even make sense. You realize that the spark plug is inside the cylinder when the boom happens right... so there is no way that a little pressure from gapping it is going to break it.

[speedracer]

I just changed from the NGK Iridium's to the NGK V powers.
I didn't see much difference except in the extra $$$ in my wallet.
I did opt for the colder plugs though since I'm running 9 psi. SO I don't
know if that would make a diff. either.

[hominemodi]

That... doesnt even make sense. You realize that the spark plug is inside the cylinder when the boom happens right... so there is no way that a little pressure from gapping it is going to break it.

well actually it says can't gap them with the traditional gapping tool. but anyway, the point was that denso are gapped correctly for sure

[SpeedAdiction20]

damn, posted before me, lol I am responding to speedracer's post ^^ those are what I have, they work great, no problems so far, just make sure you gap them because when I got them they were crazy wide

[speedracer]

damn, posted before me, lol I am responding to speedracer's post ^^ those are what I have, they work great, no problems so far, just make sure you gap them because when I got them they were crazy wide
yup their set @ .044, mine were actually like .030 when I got um. wayyy to close.

[i like speed]

I've had mine for several thousand miles and still work fine. Before these I had the v-power and got the iridium trying to fix a problem, which ended up being the #2 wire, but I haven't had any problems yet.

I was told by a tuner dude (mostly hondas) that the copper give more power but the iridium will make it run smoother. Idk if it's true or not but he's been right before.

Also you're supposed to use the gap tool that has the loops of wire instead of the disk thingy. The disk thingy will mess up the tip cuz it's so fine. But this only applies when your prying them to make the gap bigger so just make sure to get them right without making it too small.

[SleepyMSP]

I have these now, ever since I've had them the idle has been a little off and now I seem to have some hesitation going on...I've been meaning to swap them out for a set of 1 step colder plugs....

[JDM Sam]

Most you guys that are hesitating with colder plugs are fouling out. move back up to heat range 6 and you will be fine or just drive it harder to clean off the tip of the plug. The gaps is supposed to be between .032 and .028.

[orng1]

I run perfectly with the coppers set a 28, the 44 gap might be for an N/A car or something. Oh yeah a Honda runs well with a big gap.

[kanuter valve]

stock heat range:
IZFR6F11 rated at 100,000 miles. extended tip. .044
ZFR6FIX-11 rated at 50,000 miles. extended tip. .044

one colder:
IFR7G-11KS 100,000 miles. not extended tip. .044
BKR7EIX 50,000 miles. not extended tip. .032

I got this info from an NGK rep after I wasn't able to find a step colder laser iridium for the MSP. They are rated 100k because of platinum tipped ground electrodes. The IX do not have platinum but may provide slightly higher performance. The stock platinum PZFR6F11 is rated at 90k, is extended tip, and comes pregapped at .044. As stated above, set to .028-.032.

[JDM Sam]

ix has no platinum b/c it uses iridium.

[br289165]

My iridiums have about 5k miles on em now. They're fine, but didn't notice a difference from the v powers.

just baught these. Then i was reading a post on here where someone said they are no good?
but did not give any reasons why. Should i return these, before i install them?
Info would be great.

http://www.store.partsdinosaur.com/media/Iridium2NGK.jpg

[sean22306]

I have these now, ever since I've had them the idle has been a little off and now I seem to have some hesitation going on...I've been meaning to swap them out for a set of 1 step colder plugs....

I've been running NGK ZFR7F's without any problems. Part number is NGK-5913. Normally run ~$3 a plug and come already gapped at .030

[kanuter valve]

ix has no platinum b/c it uses iridium.

both the ix and laser use iridium only on the center electrode. the lasers have platinum tipped ground electrodes and the ix do not.

[Cue]

If it helps, or gives you something to gauge it by, I just installed the Denso ITV-24s (2 step).

Since I'm running SB, my tunes are always pushed to the limit (without Knock obviously...). After installing the Denso's, immediately I was able to advance timing by 1.5 (SB units from 4200rpm to 5300rpm) as well as move from 10.8afr (5500rpm) to 11.6afr. Quite the difference.

In terms of spark plugs, I always here about it smoothing out the ride, and mileage etc. Hopefully this info can help in other ways....

[special--k]

lol... never though that Spark Plugs would be so complicated. Why cant there just be one answer.

"These spark plugs are the best....( )"

[SpeedAdiction20]

nothing can be that easy.. especially in cars.. not to mention MSPs lol, just go by the general guidlines, like more boost go 1step colder and just give things a shot (it's like the way some stock blocks can handle more than 10psi and not blow then some others blow on stock boost.. it's crazy), I personally like the V-power, they work very well, nice and cheap and I wouldn't have a problem replacing them every other oil change, so say 6k miles anyways.. they are cheap enough to do that, or if you don't want to.. there isn't a problem with that either, but that's just me

[HondaEat-R]

Most you guys that are hesitating with colder plugs are fouling out. move back up to heat range 6 and you will be fine or just drive it harder to clean off the tip of the plug. The gaps is supposed to be between .032 and .028.

What he said. Also, why not runner copper w/ extended tips ? Platinum and Iridium just last longer, and they actually conduct worse than copper. zfr7f (upped boost) or zfr6f are so freak'n cheap, change them when you do oil changes.

[SpeedAdiction20]

^^ ya that's exactly what i plan to do, $4 or so every 3-6k miles is nada lol.. especially if your adding mods (I'm towards the end of my modding list for a little while, but even so)

oh I just thought of a question that I was wondering about.. my brother just got a msp with a blown engine and he is replacing the engine soon, so new spark plugs are in order, he has a T4 turbo but I (and my dad) are going to be setting the boost low like 6-7psi, or however low we can if it can't be set that low, so my question is.. should we get the V-power 1step colder like I have, or just go with the stock heat range.. the car might be between 7-8psi or so but is heavy modded with everything short of forged pistons and rods (everything else is forged with about $15+ worth of mods w/o labor cost included)... so which should it be?.. I again have no problem replacing the plugs every 3k miles or so if I would have to do that with 1step colder plugs..

[HondaEat-R]

If it's a t3/t4e hybrid, at 6psi it will move more air than the gt25rs at 6 psi. I would think running colder plugs would be good. Then again, it sounds like you're right on the edge of which plugs to use. Ask JDMSam, he seems to have a good handle on this.

[SpeedAdiction20]

ya, the guy that we got it from, well not really the guy, but the mechanic that had bought the car and worked on it for a little while kept saying that it was a k4 turbo, but that didn't make any sense so I am assuming it is a t4, I have my stock turbo set to stock..(but will be moving it to around 7.5 as a low and 9-10, depending on how it spikes on the EBC) so I just figured the T4 setup at around 7-8 psi (the wga is different so it might be 8already but I won't know till the car is up and running) so I figured colder couldn't hurt, I ran colder on stock boost for a day or 2 before I uped the boost and it ran fine..
-JDMSam, anything to add?

[JDM Sam]

Read this http://ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nml
and this
http://ngksparkplugs.com/docs/tech/Precious_Metal%20_PlugsPowerSport.pdf

[SpeedAdiction20]

oh ya, I've read those before at least the top one, but it's been a little while and I didn't really know what they were talking about back then... so at least for my car, the spark plug looks like that pic in the middle of the graph on page 3, blackish around the outer ring (base of tip i guess you could say) and grayish/chard around the tip area.. so that's good, I just wasn't sure about the larger turbo and if there were differences in heat vs psi range, and therefore shift the appropriate psi which you would use colder plugs, I think I am right on the boarder, so I'll give it a shot and check how they look after a little while..

[JDM Sam]

most people can run the 1 range colder, but will have to drive it hard to get it into the operating temperature range.

[JDM Sam]

Run heat range 6 (zfr6f) for a few hundred miles and then pull them out and check the threads and insulator on the plug. You can tell if you need to run colder or not just by checking the plug. If you don't know how to read take a macro pic and post it up and I'll tell you.