Thread: The Best Spark Plug Out There

Did you feel a difference?

looks like pretty good plugs

they're still in their boxes.. and right now I am about 600 miles away from my car for the next two weeks.

They do look great, I haven't felt a difference yet, but I installed the more restrictive quiet muffler at the same time... sooooo Will see how these do on gas mileage, then I will stick in my old plugs and see if I feel any power loss



Oh that sucks, let us know when you do get a chance though

Interesting also how they have effectively "Side Gapped" them with that design.
Hmmm.

Those are the plugs I recommend above all others. Good choice.
I've gone through two sets of those exact plugs and I love them. A guy at Advance Auto recommended them to me-its the only plug he runs in his twin turbo Supra.
I'm running a 10:1 motor w/ a JWT Popcharger only (I started with the suspension & slowly making my way to the motor).
Of all the NGKs I've tried, the Iridiums are the only ones that really make my motor sing when I get into it.
Don't have any dyno #s to back it up, it just seems to GO in quite a rowdy unbridled fashion with the Iridiums.
Its not totally a "seat of the pants" thing, there's also this SOUND, a hungry wailing sound. A beautiful spooky wail.
I also get three-four more mpg than with the coppers or platinums (my least favorite).
Strangely, the idle is a little rougher with these plugs than any of the others...interested to see what you think.
Rob

I don't see how drilling a hole could improve the overall burn that much. I think it's a gimick, personally. You really should dyno the car for true results, though.

Something kinda threw me off reading that article that Mr. Sonic himself, wrote. The grammar is sketchy, and it seems like English is not his native tongue.

Anyhow, call me crazy, but I like the standard coppers just fine. I didn't like the price/performance value on iridium plugs. I've tried both NGK and Denso Iridiums, and didn't like either. Going back to coppers in the 7 heat range works just fine.

As far as gapping down for boost, the only other way to keep from having to gap down, would be amplifying the spark, which means a digital box setup. Even though our ignitions are more than fine, technically they aren't, because we have to re-gap under boost to prevent blow outs. You shouldn't have to re-gap a plug, as it's gapped specifically by the auto vendor for best burn characteristics.

Anyhow, I'll stick with my coppers. When the car doesn't wanna keep them lit anymore, I'll move to an external firing source.

unless you're boosting or running high timing, you can still stick with a hotter plug like a 5 or 6. Because my VQ35 uses a unique plug, it takes me longer to locate the proper plug. The local places only carry the 5 heat range, so that's what I get. A hotter plug will help with combustion, but for boosted guys, it can also lead to detonation.

Hmm so I think the car did get louder... but I now also have a quieter muffler so its really hard to say haha.

As for power I felt a power loss with putting a new more restrictive muffler on, but I think the car is coming back to life (ecu picking up the new better plugs)

I will test with my Bosch +2 plugs and compare. My NGK BKR6E-11's are shot and give me a bad gas mileage as compared to the Bosch ones....



It does sound a bit fishy, but I've heard of people having luck with it, so I figured I would give it a try... it did come out to be a pretty penny but thats because I went with Iridiums



Interesting, thanks for the info

I was afraid of the 5 plugs because of the highway mileage that I do, but the guy mentioned that his plugs do run colder, so will see.

well, the whole point of hot plugs/cold plugs is because of how they act in certain cars.

Stock/hot plugs (h.r.:5) are good in the sense that they are self-cleaning. Just like putting your oven on clean mode, all the build-up is cleaned off when it gets extremely hot. Additionally, cars run better with better performance when the cylinder walls are hot. You want cold/dense air to come up in through the intake, but once the fuel gets mixed in, you want the fuel to evaporate as fast/completely as possible.

Forget the incoming air for the moment, once you're inside the cylinder, there's a heat range for all the surfaces inside, hot enough to evaporate all the fuel, but not too hot where you're going to get pre-ignition.

If you run the car hot all day long (e.g. lapping) or you boost, or you run extreme compression, those will get your cylinders much hotter than normal, then the plugs get red hot and therefore 'hot' plugs become more like glow plugs.

Honestly, though, mot many people on here need to go above a 6 h.r. I'm sure some of the boosting guys can use 7 h.r. if they're running a decent amount of boost. 8s are a little crazy, I mean, you better be boosting 20+lbs and/or hot-lapping. If you're running 8s, you're damn right you're going to be changing them out every oil change because you're a) going to have carbon built up on them or b) you're friggin' hot lapping and it's wise to change your spark plugs THAT often.

Anyway, that's just my opinion, that should all be fact unless I messed something up, you should run as hot as possible without f'ing anything up. And yes, you'll prolly get better gas mileage with 5s.