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Iridium plugs?

Discussion in 'Performance and Tuning' started by nobackhair, Nov 18, 2011.

  1. Nov 18, 2011 at 8:27 PM
    #1
    nobackhair

    nobackhair [OP] Well-Known Member

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    Tried them on my bike. Noticed a dif.
     
  2. Nov 18, 2011 at 8:38 PM
    #2
    Texoma

    Texoma Well-Known Member

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    That sums it up. I got iridium plugs too. All they do is last longer than copper or platnum.
     
  3. Nov 18, 2011 at 8:56 PM
    #3
    dayNnite4

    dayNnite4 We can't stop here, this is bat country.

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    damnit it whippersnapper, why r u so witty?? i def lol-ed haha
     
  4. Nov 18, 2011 at 10:17 PM
    #4
    nobackhair

    nobackhair [OP] Well-Known Member

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    Good guess. Nope. Had a smoother transition into higher R's. Mileage improved too. Dyno showed an 8HP increase in a 650 twin.
     
  5. Nov 18, 2011 at 10:18 PM
    #5
    nobackhair

    nobackhair [OP] Well-Known Member

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    We're all idiots I guess. Just not complete ones.
     
  6. Nov 22, 2011 at 3:26 PM
    #6
    Trifenix

    Trifenix Well-Known Member

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    i wasted money on iridiums, true story :)
     
  7. Nov 22, 2011 at 3:31 PM
    #7
    scocar

    scocar Scouting the perimeter for weakness

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    Back to square one after the 2001. So...
    So you did a baseline study of used non-iridiums compared to new non-iridiums, and then you also studied the new non-iridiums compared to new iridiums, and you got this documented improvement over new non-iridiums?
     
  8. Nov 23, 2011 at 9:09 AM
    #8
    nobackhair

    nobackhair [OP] Well-Known Member

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    Are you that interested in my bike or just funning over my mundane inquiry?
     
  9. Nov 23, 2011 at 10:14 AM
    #9
    scocar

    scocar Scouting the perimeter for weakness

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    I am not really interested in your bike per se, but I am interested in any substantive data (not just "opinion") about actual plug performance, because there is a lot of misinformation, marketing hype, and misundertanding out there. I found an interesting research article from Denso about their development of platinum and then iridium plugs, and I have not read the whole thing yet (pretty dense, and I am too busy with other business at the moment), but the gist of it is that basically iridium prolongs life, and in very high-performance applications, can increase combustion efficiency, but we are talking very small amounts that are not apparent in anything that is street legal.
     
  10. Nov 23, 2011 at 5:38 PM
    #10
    nobackhair

    nobackhair [OP] Well-Known Member

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    I think evrything your sayong hear makes a lot of sense. As far as the bike goes I ran a normal plug 8 months before I thought it should be replaced. I've had the iridiums in for 2 yrs. before and 2 yrs. after the othersand they are still performing like new. If you remember, Let me know if you think there is anything conclusive when you get a chance to finish reading that article.
    Busy is good.
     
  11. Nov 23, 2011 at 6:09 PM
    #11
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Comparing a bike performance gain to a trucks is an apples to oranges comparo. Bikes try to get the most hp out of the smallest displacement. most bikes DO run iridium plugs, or the like, from the factory. The ignition system is designed for it. Trucks are a different animal. You will not get any gains from switching plugs, other than replacing worn plugs with new. In many cases, iridium plugs, or platinum, unobtianium, turquoise, etc., can cause en CEL, and the engine to not run very good.
     
  12. Nov 23, 2011 at 7:09 PM
    #12
    extremachn1

    extremachn1 I am an asshole, deal with it!

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    I switched to Iridium plugs... But I had to when I went with the S/C. I agree with what chris and the the OP said about bikes. You will see a small improvement in a sport bike with iridium plugs but unless your running high RPM/boosted applications on our truck it makes no sense.
     
  13. May 18, 2012 at 6:02 PM
    #13
    Rail

    Rail Well-Known Member

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    Hey, My '06 Tacoma has 80,000 on it so I figured I better change the plugs. I checked the gaps and they were all burnt down to .55. I installed NGK LFR6AIX-11/6619 and left them set on .43. I thought the truck ran good before but now she really goes. I also noticed lots better MPG. I know it's because of the old plugs that I am noticing the difference but I'm just saying, i dont find anything wrong with the Iridiums and I didnt want to change again for a long time so they are working for me "today". I did bust my little knuckle installing them.... :)
     
  14. May 18, 2012 at 6:10 PM
    #14
    ColtsTRD

    ColtsTRD .....

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    OEM Plugs FTW!!!
     
  15. May 18, 2012 at 6:21 PM
    #15
    Texoma

    Texoma Well-Known Member

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    Just checked my iridium plugs at 40k mi and they still have a .043 gap with no wear.

    Iridium plugs FTW
     
  16. May 18, 2012 at 6:30 PM
    #16
    amain

    amain Well-Known Member

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    My stock plugs now call for Iridium plugs. Just install the supercharger and that will be the standard.
     
  17. May 18, 2012 at 6:31 PM
    #17
    Rail

    Rail Well-Known Member

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    Good, I hope mine hold up for a 100,000. :)
     
  18. May 18, 2012 at 6:33 PM
    #18
    amain

    amain Well-Known Member

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    I dont think I will let mine go that long.
     
  19. May 19, 2012 at 7:32 PM
    #19
    JustMe

    JustMe Active Member

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    Yep, the 4L in the Tacoma is the last truck engine to use copper plugs. All the V8's and 2010 4L ( 4runner, FJ) use OEM Iridium for long life (100K life).
     
  20. May 27, 2012 at 1:38 PM
    #20
    koco

    koco Well-Known Member

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    Iridium or platinum on plugs won't increase performance, but will increase the service life of the plug.
     
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