I've noticed a very slight misfire under light acceleration lately and it feels like my car ('94 SC400) just may need a tune-up. It's been 44K miles since my last tune-up and I'm running the Denso iridiums. Could I be reaching the end of their service life? I thought I might try the NGK's this time. Anyone else been running the Densos for awhile like me?
copper for best performance; otherwise either ngk or denso will be absolutely fine.
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95 Jeep Cherokee BDS/hybrid 5" lift, 32x11.5 BFG mt's, welded rear diff, long arms, etc. trail beater.
This is a fantastic question, 2 of the top JDM brands for plugs. Since the first time i ever tuned up my puch daytona moped when i was 14 back in the early 80's i've always bought NGK when it was time to change plugs. Im damm sure Denso is just as good but im a brand loyalty kinda guy.
NGK FTW
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Click on the respective plug to get more details.
You will note that the plug quality appears to go from worst (at the top) to the best (at the bottom).
Click on the respective plug to get more details.
You will note that the plug quality appears to go from worst (at the top) to the best (at the bottom).
Thats my $.02
i agree. any iridium in a standard engine should go 100k esp from denso or ngk.
however i wouldn't say that quality goes from worst to best in that chart.
quality is different from longevity. the standard copper plugs actually give the best gas mileage and hp of any of those plugs, for reasons i don't want to get into unless someone wants to know, and they're the cheapest. i use ngk copper $2 plugs in my 400hp wrx and 300hp talons. they just don't last as long as platinums or iridiums so that's why they're not recommended. mfr's can claim longer tune up intervals that way.
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99 Dodge Ram cummins turbo diesel, 5 speed, 344 HP, 808lb.ft. 18/21mpg, less than $1000 invested in mods, shooting for 1000 lb. ft. on stock turbo.
Kawasaki Ninja ZX-12R 1200cc's, 190 hp of pure evil on 2 wheels.
95 Jeep Cherokee BDS/hybrid 5" lift, 32x11.5 BFG mt's, welded rear diff, long arms, etc. trail beater.
i agree. any iridium in a standard engine should go 100k esp from denso or ngk.
however i wouldn't say that quality goes from worst to best in that chart.
quality is different from longevity. the standard copper plugs actually give the best gas mileage and hp of any of those plugs, for reasons i don't want to get into unless someone wants to know, and they're the cheapest. i use ngk copper $2 plugs in my 400hp wrx and 300hp talons. they just don't last as long as platinums or iridiums so that's why they're not recommended. mfr's can claim longer tune up intervals that way.
I actually have gone with Bosche Iridium (Plat-Iridium Fusion) -- I will post any noticeable differences to the current plugs in the next few days when they are actually in use
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