WHAT ARE THE BEST PERFORMANCE SPARK PLUGS??????

[garrik23]

I HAVE AN 04 COUPE GREDDY EXHAUST, JWT POP CHARGER, PLENUM SPACER, AND GREDDY HEADERS, THE CAR IS BEAUTIFUL I LOVE IT BUT IT FEELS LIKE ITS NOT GIVING ALL ITS GOT, I HAVE 35K ON THE DASH SO I ASSUME IT MIGHT BE THE SPARK PLUGS, IF ANYONE KNOWS FROM PAST EXPERIENCE WHAT PLUGS I SHOULD GET PLEASE GIVE ME A POST. PERFORMANCE ORIENTED PLUGS. THANKS A LOT

[infinitgkid]

well for personal preference, i'd go with NGK... but thats just me...

[CYO44Baseball32]

WELL MAYBE ITS YOUR ECU, TRY DISCONNECTING THE BATTERY AND PRESSING THE BRAKE TO RESET IT, THEN SEE HOW IT FEELS BEFORE YOU TRY TO REPLACE THE PLUGS

NEXT TIME PLEASE CHECK THE CAPS LOCK, THANKS

[BrandAidDesignG35]

NGK R iridium plugs are recommended I just put mine in last weekend, and installed the engine damper, huge difference now, exhaust is louder, and you feel the engine, really, it shakes the car to the point where it's really sporty now, major increase in sensitivity in the lower RPMs, but it unleashes past 4k.

Oh, and set your gap to .43

[C-Kwik]

NGK R iridium plugs are recommended I just put mine in last weekend, and installed the engine damper, huge difference now, exhaust is louder, and you feel the engine, really, it shakes the car to the point where it's really sporty now, major increase in sensitivity in the lower RPMs, but it unleashes past 4k.

Oh, and set your gap to .43

Iridium plugs, in that of themselves, offer little to no benefit in performance over platinum. The iridium portions of the plug will be stronger and longer lasting, and boasts a small reduction in electrical resistance. Appreciable gains in perofmance can really only be seen when the properties of iridium are taken advantage of properly. That is, it's longer wear characteristics lends itself to using smaller electrode sizes, which reduce quenching of heat back onto the electrodes. NGK's IX series iridium plugs use about the same size center electrode as their platinums. The IX series also uses an iridium center electrode with a standard type of ground electrode. The OE calls for a double platinum plug because the distributorless ignition in the G35 (and most new cars) generate a spark in both directions, which doubles the number of sparks that occurs and since one spark is generated at the ground, it will wear the ground faster than if the ground only acted as a ground all the time. As a result, I would not recommend the IX iridiums on the G. I would use them on a car that uses a distributor though.

The only iridium plug available in the US (to my knowledge) is the denso SK series platinum plugs. These have a center iridium electrode and a platinum ground. No performance benefits would be expected, but the plug should lasty longer than the OE double platinum. The Denso IK series ias an unltra fine wire iridium center electrode with a standard ground material. This type of plug might actually have a slight increase in performance, but wear will be accelerated for the same reasons as the NGK IX iridiums.

NGK makes a center iridium with platinum ground plug, but as far as I can tell, it is not available in the US through their regular distribution channels. Hopefully that will change soon.

[BrandAidDesignG35]

well said C-Kwik,

I just went to Infiniti dealer parts counter, asked for the g35 plugs, 118 bucks later, I felt I had the right ones... When I asked for G35 parts at local autostore, they offered bosch platinums, I wasn't buying them, I only heard NGK works... We should have a poll to see what everyone's running, and for comparison's sake, we could figure out what works best... on several aspects of performance, MPG, and longevity.

Cheers - Grant

[C-Kwik]

For the record, I'm running the Denso Iridium IK Iridiums in the Titan. No percievable change in performance. Gas mileage is about the same too. Longevity results would have to wait until these things wear out. If they wear as slowly as implied by the properties of iridium over platinum, it'll probably outlast the time I keep this truck. Then again, who knows...