to cap or not to cap an iriduim plug?

[Fenvy]

I bought 2 sets of NGK-BKR6EIX (ngk iridium) for my sr20det

I did a search and I get the following result:

1) they always pre-gapped2) they need to be gapped3) they sometimes needs to be gapped, depending on the level of tune4) they CAN'T be gapped or the tip will be damaged

this is quite confusing... so which one is it? really?

someone also said the iridium foul quickly, but 180fan said that they will last for a long time. I remember reading on ngk and they stated that colder plugs will foul quicker... so um what should I do?

[9240sx]

Are they pre gapped for the sr20det motor or the sr20de motor?Id check the gapp first.

[Luke]

Iridium has the potential to last much longer than others.When I got my Denso iridiums, I didn't have a gapper. I assumed that they were pre-gapped, based on the myth that these come pregapped and you shouldn't gap them. WRONG. I went months with my SR running sluggish at low rpm and having poor response.

I bought a spark plug gapper and found that they were gapped in this order. .21, .20, .28, .24If you're running 14 psi on an SR, a good gap would be .28.The higher the boost, the lower the gap should be(generally).

I regapped by moving the curved part at the end, not touching iridium part(for lack of better words). I'll tell you that my SR runs wayy better after I did this.

I hope this clears up some rumors that seem to go around places like this.

[180fan]

Yeah, I still stand by my statement that iridiums last a long time. Toyota uses the Denso Iridiums in my sisters 2k corolla. I asked when they should be replaced, and the dealership said 90k is the regular change interval for iridium plugs. This assuming you've bought the right heat range.

Personally, I've used IR plugs in all the cars I have to maintainence, and have never had a problem with them fouling. Buy them in the proper heat range, and they'll last a long long time.

In my SR, I bought the NGK BKR6EIX-11, used the gapper coin, since the one with the U shaped one might break off the tip. Now I use feeler gauges, they're a bit more accurate than the coin and get me within the "very close" range when I use em. Besides, I lost the coin somewhere in my buddy's garage and since I'm doing a build on another SR, the feeler gauges were close and handy. lol

[mynismo]

i've used both denso and ngk iridiums and after i bought them, i just threw them in. didn't mess with the gap at all. runs perfect... this is at 7-15psi.

[Fenvy]

ah!

180fan in another post you said NGK-BKR6EIX-11 is for ka and NGK-BKR6EIX is for sr..

which one is colder?

[180fan]

they're the same heat range. The -11 is the gapping. They make the 0.044" gap available here, but not the 0.036" (I think?) for the SR's. The NGK numbering system breaks down like this.

B - 14mmK - hex size 5/8 projected tipR - Resistor type6 - heatrange (lower numbers are hotter plugs)E - 19mm thread reachI - IridiumX - Booster Gap11 - 0.044" gap

I think the proper gapping for the plugs if I remember the platinums that came out of my SR's is a -9 (0.036"). If you get the -11's, you can put them to -9 spec as they're just within NGK's spec of "what you can gap without damaging the plug". Hope that helps

[Fenvy]

****ing beachhhhhhh I tried to gap it and it broke the ****ing tip