I'm putting my D16Y8 (built) on 16PSI on a T25 for around 300WHP. I'm wondering if NGK Iridium 6 Heat step will be enough to not cause detonation.

 

I personally think the Iridiums are a waste of money on most cars that do not need them (ECU not compatible with non-resistor plugs). Also, I would go a step colder and get a set of 7s.

 

what ones that come in a Z fit in a civic?

because none of these models come in a 7.
V-Power ZFR5F-11 # 2262 .044
G-Power ZFR5FGP 7098 .044
Laser Platinum PZFR5F-11 * 4363 .044
Iridium IX ZFR5FIX-11 2477 .044

 

I have NGK ZFR7F-11 in my car and plenty spare so they exsist. and work very well for me.

 

wtf i went to the NGK catalog in the store and i couldnt find any of those in a step 7.

 

At the autoparts store you need to ask for the stock number not the par number
Stock# Part#
5913 ZFR7F
6855 ZFR7F-11 (-11 is just a preset gap, you have to change it anyways)
or
4644 BKR7E

all are copper plugs, cheaper and techically a better conductor. i dont even think they make iridium zfr7f plugs

 

they dont. not that fit our car at least. There are supposedly some laser iridiums that will fit. But they are like $15 a plug. Idk about these cheap copper plugs. But im gonna run them and see how it turns out.

 

they are lower cost not cheap in quality. change them a bit more often and you will be fine. $10 every 5-10k miles wont break the bank

 

The regular NGK V-power copper plugs work absolutely amazing. I've been using them for years in tons of imports and different engine setups. You may think just because they're cheap that the quality is not there but look at the ****ing brand name on the box. NGK does not make **** products.

 

x2!

Ngk 4554

 

non-resistor plugs are not recommended for use with Honda ECUs. and 8's are too cold for his application.

 

i never said they were ****. But they are probably not as good as their more expensive plugs.

 

No, I'm serious, use them. I guarantee you most of the guys running forced induction are using them. Anytime I tried to use the more expensive plugs I had worse results than using the V-power copper plugs that cost me 1.50.

 

ok well i got a set of them already. Ill see how it goes. Although I feel a bit better since I was @ a local performance parts store today and they had a whole case of V-Power plugs there in different heats. And then they had some V-Power Racing plugs (which i've never seen before).

 

The use of Iridium in the plugs is not for increasing power. They last a lot longer because the Iridium electrodes don't erode as fast as they do on the copper plugs. That is why they are used in modern cars. The manufacturers have to guarantee that emissions will remain low for many miles. Copper plugs last about 15k miles. The replacement interval of Iridium plugs on newer Honda's is usually 105k miles. History has shown that the average person can't be trusted to maintain their car and in the past the majority of cars that failed smog tests failed simply because they weren't maintained properly (usually due to worn out spark plugs). Platinum and Iridium plugs actually require more voltage to fire and in some cases if these plugs are installed where coppers were originally specified the car will run poorly. I saw this countless times in the early 90's when Bosch originally came out with platinum replacement plugs.

 

Like I said, just because they're cheap doesn't mean they're not good plugs, it just means that it doesn't cost a ton to manufacture them. The nice thing is that they cheap enough that you can replace a few sets of them before you'd touch a set of iridiums. Also, the whack thing about iridiums is that you can't gap them IIRC. The electrode on them is like a pin head, and anytime I've seen someone try to gap them they break. The V-powers can be gapped to whatever you want without worry of breaking one of the electrodes, which is very useful for turbo applications where changing the gap can make a big difference. On my 90 Probe GT turbo I ran the stock gap on the plugs when I first changed them. After doing some reading I went back through and gapped them at .039" instead of .045" and it seemed to rev smoother. Go with the V-powers and I'm sure you'll be happy with the results.

 

which ones did you go with?

 

i got the regular V-Power ones in a step 7