I have the screemin demon coil packs on my car, and all i really noticed was a smoother idle.

 

I use the NGK Iridium plugs. I have the Hellion single turbo kit, which is very similar to a centrifugal supercharger like the Paxton. Mine are gapped at .035 and I use the MSD coils. The MSD coils work great, but they're nothing special. They use the same design as the OEM coils. The ones I've been looking at to replace mine are the Sniper Weapon X coils. The whole inside of it is a wound copper coil and it actually clamps onto the end of the plug, so they transmit a lot more electricity to the plug, and they don't have to bolt into the intake manifold. Sniper says they've seen gains from 10-80hp and up to three more mpg's. I'll believe that when I see it, but if that's the truth, then I would say they're worth the $450.00 price tag.

 

What do you think about this? Im going to put in my new 255LPH fuel pump, along with the weapon x coils and the NGK TR6IX iridium plugs. the gap they come with. Im jus hoping my car will be ok and not run lean.. Im going to put on an air/fuel ratio gauge as well..

 

I think you're a lot better off going with the V-power platinum spark plugs. I remember cliffy explaining that iridium spark plugs are NOT ideal for our motors. This prompted me to research this before I bought spark plugs for my supercharger setup.

The difference between a platinum spark plug and iridium spark plug is two things: the alloy used to make the electrode and the diameter of the center electrode. In platinum spark plugs the diameter of the center electrode is on average 1.0-1.1mm. Iridium plugs run from .4mm - .7mm. So you're asking whats the effect? The smaller the center electrode the less voltage required to fire the spark plug because the smaller electrode emits a more centralized, stronger spark. Iridium electrodes also having a melting temp of 700 C higher than platnium alloy electrodes. This technology is required in situations where extreme cylinder pressures/heat make it much harder to fire the spark plug(therefore more voltage is required to fire that spark plug under boost). So when you switch to iridium in this situation from platinum you can run much more spark on the same amount of voltage. Therefore iridium is only actually needed when you have a power train/ignition system that is being overwhelmed by cylinder pressure and cannot fire the spark plug enough to sustain smooth operation. A side note is that Iridium alloy electrodes have not only a melting point of 700 C higher than platinum alloy electrodes, tests prove that they are "four to five" times more resistant to wear. These advantages are only needed in extreme situations as stated above.

Fortunately for us that threshold is farrrrr higher than 99% of the people on this forum will ever see. Were talking 30+ PSI FI systems needed to create the cylinder pressure/heat environment to actually require iridium alloy spark plugs. Up until that point Platinum alloy electrodes(NGK V Power) are perfectly fine. Ontop of all of us when our cars were engineered(mid to late 90s) they were not engineered at all with Iridium spark plugs in mind.

To top it all off I am running NGK TR6 V-POWER gapped at .032-.034 on my KB 2.1L setup @ 9 PSI with absolutely no issues. V-Powers are just fine for you and Iridiums are not worth paying extra cash for.

 

I went ahead and got the NGK TR6's V-power.. Didn't get the coils. Also autozone has a special on castrol oil w/ filter.. regular is 17.99 for both, and synthetic is 27.99 for both. Spent 50 bucks on spark plugs and oil & filter. 89 dollar High Flow 255 fuel pump.. So I feel I came off pretty good.

 

use the motorcraft platinum plugs, that what we use with the s/c roush, saleen, svt, and shelbys, the NGK do fine in imports but they carbon like hell in tuned 4.6l and 5.4l. case in point i had a 2003 svt F150 in the shop the other day running the tr6 v-powers, truck ran like absolute ****, pulled the plugs they were burnt to hell. put the motorcraft platinums in truck ran fine. the 4.6 and 5.4 just dont like those plugs, save yourself the hassle use the motorcraft and roll on they make more than enough spark.

 

So let me get this straight. You came to the conclusion that TR6 V-Power are hellbent on carbon buildup because some random ******* pulled a vehicle that you dont know where its been, who tuned it, what they were gapped at, what parts have been put on it or whats been done with it at all and you concluded its the NGKs?

I think they're fine. Case in point I have a 2003 mustang GT with NGK TR6 V-Powers, car runs like an absolute dream, see no reason to pull plugs. UseewutIdidthere?