Iridium or Platinum...?

*edited*

Your not gonna see huge performance gains from going to Iridium. But you most likely will see a gain in electrical/ignition system component lifespan and some better fuel efficiency.

Iridium, per NGK, is mostly a more efficient and lower resistance plug. It requires less voltage to spark, yada yada yada... and in short just means a cleaner, easier, more fuel efficient spark.

For Nos, Forced Induction, wild tweaked drag cars, etc... they have multi surface plugs and colder plugs for most of their product lines. But you dont need and prob dont want those. Just go for either the Delco Rapidfire, NGK Plat, or Zex plugs. I'm about to give the Delco Rapidfires a try. We'll see how I'm feeling this week and or weekend. I have therapy on Thursday, so I should be feeling up to it on Saturday, plus I'll have help on doing it should, or when, I need some.

Good luck, I'll let you know how things turn out with the delco rapidfires. I've used them on several of my track toys and my old 91' Taurus SHO which was mildly modified. Loved the Delco's on that car, very nice plug IMO.

*EDIT/UPDATE*
go check these things out @ http://www.iridiumpower.com/default.asp

After reading this, and Zex, and Delco's site I honestly think these Denso Iridiums are the way to go. The Part#/Model# for Legends is IK20, at least it was for the 94' Legend. Anyway, it makes a lot of sense the more I read it. Like I said earlier, it uses less voltage and sparks easier/more efficiently, etc.. so it does seem to be reasonable that they would "increase performance and fuel economy" and all, I'm gonna give my local distributor/speed shop a ring Wed and see what I can find out, esp $$$ wise.

There is some joker on ebay selling these for about every vehicle, but his auctions are kinda hokey to me. I'll shoot him an email anyway to see if the Legend comes with the IK20's or what. His auction says its $70 + $8 for s&h. I'll ask him about doing a group buy option if its for the correct plug for us 2ndG's I'll let ya know the response.

If you find a local dealer/speed shop with them for less than this, leme know!

The price of $70/set isnt all that bad when you consider how much the NGK's from Acura cost

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95Legend6Spd said:

Honestly guys, not to slam the Denso's (... run them in the Supra, two heat ranges colder...), but you're not going to see dick for performance gains on the Legend by using those... with high Compression/High boost engines, yeah, it does make a BIG difference, but with a stock car, under 10:1 CR, it's not going to do anything but cause you to eat cheaper for a week...

Click to expand...

Now, I totaly understand what your saying, and I'm not trying to step on toes...

While you may not gain HP or Torque, when there is less resistance, things happen easier. Take this plug for example, in theory it could save on gas b/c of its design and lower resistance, it could do a number of things. But without installing them and giving it a shot, nobody will ever know.

I've decided not to bother with it though. I have Delco Rapidfires in my 94' GS now and I like them just fine. I re-gapped them to 0.044 from the stock 0.040 I think and they are doing a much better job than the NGK Platinums that came out of it.

Do they 'feel' like it gives more power? It sure does in nearly all the RPM range. Does that mean it actually does? Nope. I'm not gonna go throw my car on the dyno to test plugs myself. If I like how the car drives, I leave it at that.

As a backup, I have a set of Denso Plat's gapped and ready to install, just in case something happens. I've used the Rapidfires in many other cars and have always had a great time with them. In all honesty, I think they are a better plug than many others out there. Granted thats really depending on your application. But for all the cars I've ever owned, it has to be a dependable, reliable, hard working machine that wont let me down when I need it most.

I haven't dynoed my car or anything. But after puting Denso Iridium plugs i did know a difference in the reaction time in my car. Before the plugs (with just my intake in), when i slammed on the gas the car would start out kinda sluggish, it would take about a full second or so between the time i slammed on the gas and the time the car started moving. With the plugs in, the cars reaction time is much quicker, the throttle feels more resposive, especially in the lower gears. Its not a HUGE difference in performance, but it is a noticiable one. Now i know, that all the tech talk says that there shouldn't be a difference, but i'm just speaking from personal experience that there is. My friend who has a 00 Accord noticed the same improvement in performace after he put in his Denso Iridiums. I know the Denso's are more expensive than other spark plugs, but nither my friend or i regret our purchase, we both are really happy with the Denso Iridiums.
BTW, I previously had NGK Platinums in my car.