Denso iridium plug

Does anyone has experience about the Denso iridium spark plug? I am interested to get a set, but I find that the factory and NGK call for .044 pluy gap, and Denso called for .032. Anyone here ever try?

I dont know anything about the plugs you mentioned, but Im keen to know more about Platinum spark Plugs. A friend put them in his Subaru Legacy Twin Turbo. He said that they made heaps of difference. Can spark plugs make that much difference?(for his sake I hope they do because they cost HEAPS!) .:shocked:

I would say gap them to factory specs and see how they run, I don't have much experience with plugs either, but I know they will make a difference if you'd never had a tune-up before say after 40,000 or so miles depending on the your driving conditions and types of fuel you use. :)

The platinum plugs give a better spark and has a better longer life. The centre wire is Platinum tipped allowing for this.
There is a new platinum plug called "SplitFire" which has a "V" in it which allows the flame to spread down and around in the cylinder when firing which gives a better combustion, where as normal plugs flame out to the side as it is blocked by the end of the plug.

Choosing the right plug can make a big difference. The wrong type can do damage to the engine,or make it run like shit.
A "to hot" plug can cause piston/ring damage as it burns to hard, where a "cold" plug wont burn enough,causing it to start fouling the plug with unburnt gasses etc.

Hope this helps you out.

Cheers
:D

Oh they are selling "Missfire" in New Zealand too? Men don't even waste your money and buy them. I used them before, and I returned them for my money back. They are expensive but make no difference. Then I used Bosch platinum, which is also known not a very good plug, but at least it run better than Missfire plug.

I look up the Denso site and they said the spark of the Iridium plug is so powerful which some of their plug are not using factory spec gap. Which make sense for me since it has the smallest tip and spark should got "squeeze out" stronger.

I think it worth a try, and the price is about the same as NGK platinum. And it should last longer.

Thanks for the answer on the "misfires"....lol
I was thinking of getting some this week, but it looks like i will stick to my NGK Plugs.
Intresting about your answer as i have yet to know anyone that had used them.
Thanks again

Juz bought some
DENSO Platinum Plugs
need to know if i have to Gap them?
and how much to gap them?

Well, the G20 Manual states to gap the NGK BKR6E Coppers at .031 - .035 and it's known that the NGK PFR6B-11 are gapped at .044, I would say that the Denso Platinums (or did you get Iridiums, anyhow) will probably be gapped differently as well.

If Denso states gap them at .032 for Iridium, at .0?? for Platinum, then gap them at what Denso suggests. They would have probably did some type of R&D to come up with the proper specs just like NGK did. They are a very reputable company so, I would go with their recommendations.

That's only my opinion. Other's might think differently.

Originally posted by primera man
...it looks like i will stick to my NGK Plugs.

Good idea.

Our stock plugs and wires are the best you can use for our cars (unless you get into the bigtime HP area where you might like different wires).

There's been a lot of aftermarket plugs and wires tested and they all yield negative effects, with the exception of Nology wires (in some cases).


Unless you have a crazy turbo setup, stick with the stock stuff!

so what to gap the spark plugs at?

Originally posted by GtRider
so what to gap the spark plugs at?

Not sure. I think someone posted the gapping specs for our stock plugs (NGK's).

You can try that, but I wouldnt know. Doesnt Denso make application specific plugs? Do they say they are for an SR20DE? If so it should tell you what to gap them at.

Originally posted by GtRider
so what to gap the spark plugs at?

Well, I searched the Denso site and they do not list applications for or gaps for the Platinum plugs. Only found gap for Iridium which I posted above.

Just some thoughts:
1. Where did you buy the Platinums?
2. How did you know they were the right plug for your application (SR20DE)?
3. Why don't you just call the place you bottom them and ask them what Denso recommends for the SR20DE.
4. Make sure you have the right plug.

That would be my position since no one seems to have much knowledge on the Denso Platinums. Or bring them back and get yourself some NGK's (PFRB6-11 or BKR6E).

Just bought a set yesterday. I've noticed a little faster acceleration on the freeway compared to the Bosch 4+4. I thought they were already pre gaped. Thats what they told me at auto zone

hey 99SilverG20t
which plugs are you refering too?
i have a set of the denso double platinum spark plugs.
and on the box it says to gap to meet engine specifications.

DEFINATELY put the gap at .35thou or 115mm bigger . I have spent many afternoons fiddling with the gap. Going any smaller causes rough idle and loss of hp. The NGK plugs are by far the best and I would reccomend going to a colder plug. I run the 7b-11 with no troubles. But also on 98octane fuel, 19degrees advance and 8.8mm spiral wound leads. The leads and plugs have made a big difference and so has the timing, probably about 10 hp altogether. You poor people in the States running on 91 (at best) gas may struggle with this though.:D

Originally posted by NA Racer
You poor people in the States running on 91 (at best) gas may struggle with this though.:D

Hey, it's not that bad here. Atleast, not in all of the states. We get 94 octane here in Ohio and the local Sunoco station offers racing fuel (If n ot mistaken, its K2 racing fuel at 114 octane I think) as well. At a premium that is. The racing fuel generally runs twice as much as the 94 octane and probably isn't worth it in a normally aspirated engine.

94 isn't so bad then. We can get 115 race fuel to but costs about 20c more a litre.