tktommy

I'm thinking of replacing my stock spark plugs with new iridium spark plugs. I've seen that many of you use Denso Iridium spark plugs, what has been your experience? What type of plug did you get i.e. 16, 18 or 20? Did you notice any difference in throttle response and gas mileage? Any information would be helpful. Thanks.

bioyuki

I believe its the IK-20.

blazerbob1

Denso IK-20's! My brain feels like crisper throttle response and my gas mileage has avg. 24+ since new with best 28+ on a trip that saw a few over 100mph runs! Plugs are pricey though, would do other mods first like CAI! Good luck with your mods.

JZ

IK20's and I don't believe they really do a damn thing that's noticeable. There is no way they increase gas mileage anything noticeable.

vuduvida

FYI... The new NGK Iridium IXs are nearly half the price of the Densos. According to a person on the TL board, a NGK BKR5EIX-11 is an equivalent to a Denso IK-16 and a NGK BKR6EIX-11 is the same as a Denso IK-20.

http://www.ngksparkplugs.com/product.../iridiumix.asp

tktommy

I've thought about CAI mod for my Type S, but I'm concerned about water ingestion. What has been others experience been with CAI?

JSuppi

If you are seriously concerened (sp??) about water injestion in your CAI get a bypass valve.

Heck even if you aren't concerned about water injestion I would still get a bypass valve (a little precaution goes along way).

Again the surest water to prevent water injestion is to not drive through water higher than the bottom of your rims, if you do even without a CAI (and the stock intake) you're going to risk water injestion.

spiroh

Mods/CHod FAQ this!!! The Denso part # is very important.

[VTEC]TL

I'm running the NGK Iridium IX plugs equivalent to the Denso IK20's. I have experienced much better throttle response than my Zex plugs and slightly stronger acceleration. IMO, they are worth the $38 bux I spent on the set of 6(Much better than $84 for 6 Densos).

tktommy

Where did you get the NGK's for $38.00 and what is the part number? Thanks

Infamuz

I have the Iridium IK20 and tell you the truth I love them! I notice a increase in my gas milage.

[VTEC]TL

I got the NGK Iridiums from www.sparkplugs.com

the part number is BKR6eix-11 for the Denso IK20 equivalents.

BNut

Could somebody do a head to head dyno comparison of the Bosch Plat 4+ (or whatever they are called) the Stock NGK Plat Plugs, Denso Iridium's, and the NGK Iridiums. Oh yea, and maybe just throw in a cheap set of NGK copper plugs just to see how copper performs.

Inquiring minds would like to know.

Mike

good idea. archived!

convitcon

can any one show me how to change them ?? please ....

fantom

Guys I just got set of 6 stock spark plugs from the dealer 124 dlls . Is there anything better than stock plugs for real? Thanks!

Chaptorial

Well there's nothing really wrong with the OEM ones. In fact unless you upgrade to forced induction you won't really need to upgrade your plugs.

However that $124 seems really high for a set of six.

You could have bought a set (6) of Denso Iridium Spark Plugs for like $90. This would be the next logical step up from the stock NGK's but again they're not really necessary.

Even the stock ones you got from the dealership (NGK G-Power Platinum. Part # ZFR5FGP) can be bought online for $2.69 a piece.

Click Here

I'd try and take them back ASAP if they weren't already installed.

Dealers will always rape you on parts.

I'm not an expert on spark plugs though, so someone else may have a better suggestion.

fantom

Thank you !

Chaptorial

And just to clarify the stock CL plugs are NGK Double Platinum Part# PZFR5F-11

They'll run ya about $12 apiece online.

racersky

hmmm for some reason the plugs are 41 dollars and not 38.

ThomWV

This discussion has me a bit confused. It seems to me that if a spark plug is firing, and the engine is not missing at all, then it really doesn't make a hoot in hell what the center electrode is made of. And this occurs to me too, if the engine is not missing then how can one spark plug give any greater acceleration, fuel economy, or anything else than another one?

By the way, I have a trip I make once every couple of months that is just over 300 miles that is a mix of rural roads and interstate highways. Every time I take the trip I use it to check my fuel economy. Generally I drive on the Cruise Control as much as I reasonably can and I generally set my speed at about 5mph above the posted speed limit. In the five trips I have taken since last July my milage has varied between 30.1 and 30.7 mpg. My car has a bunch of miles on it too, I changed the oil and filter last night, it was at 233,464 miles. So with that kind of milage on mine I'm sort of surprised to see so many of you all getting less milage out of your cars, which I presume have somewhat lower milage than mine.