Spark Plug Data Base

Discussion in 'Mazdaspeed 3/6 Engine' started by Awafrican, Mar 18, 2016.

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  1. Awafrican

    Awafrican Silver Member

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    This is a database for spark plugs which have a heat range of stock / 1 / 2 stages colder than stock. If I'm missing anything let me know and I'll update

    MSO Spark Plug Database

    Gap size: 0.026" - 0.032"| Preferred gap is between 0.026" - 0.028"
    for you those who gap in mm: 0.66mm - 0.71mm

    Type and Specs on DISI 2.3L Spark Plugs: 14mm; 5/8 hex; 25mm reach; projected tip; resistor plug

    Heat Range Conversion Chart
    HKS 25 30 35 40 45 50 52.5 55
    DENSO 16 20 22 24 27 31 32 34
    NGK 5 6 7 8 9 10 10.5 11
    Spark Plug Manf & Part Numbers

    Denso Iridium
    • itv-20: Stock heat range
    • itv-22: 1 stage colder heat range
    • itv-24: 2 stage colder heat range
    • itv-27: 3.5 stage colder heat range
    NGK IX Iridium

    • NGK LTR7IX-11 (6510): 1 Stage Colder Heat Range
    • NGK LTR6IX-11 (6509): Stock Heat Range
    • NGK ILTR6A-8G (3787): Stock Heat Range
    HKS
    • 50003-M35LF 'Mazda MZR Engine': Mazda 3, Mazda 6, MX-5 '06 7 $22.97ea. - 1 Stage Colder Heat Range
    • 50003-M40LF 'Mazda MZR Engine': Mazda 3, Mazda 6, MX-5 '06 8 $22.97ea. - 2 Stage Colder Heat Range
    Torque Master Spark Plugs
    • SVTP8BR: Stock Heat Range
    • SVTP7YR: 1 Stage Colder Heat Range
    Autolite Iridium
    • Autolite Iridiums XP5364: Stock Heatrange
    • Autolite Iridiums XP5263:1 Step Colder
    Copper Plugs

    NGK Copper Plugs
    • LZTR4A-11 (5306)
    • LZTR5A-13 (4306)
    • BKR7E
     
    Last edited: Apr 12, 2016
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  2. GCPhotographers

    GCPhotographers Greenie Member

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    Trying out the Autolite Iridiums XP5263:1 Step Colder
    Wish me luck.
     
  3. Awafrican

    Awafrican Silver Member

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    Good luck, I personally am swapping from denso to NGK
     
    Awafrican, via a mobile device, Apr 6, 2016
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  4. monkey.bones.007

    monkey.bones.007 Chuckin' sausage like a hooker rubs dick Greenie Member

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    I will be doing the same on my next plug change. In 2k miles.

    tapatalk, it sucks
     
    monkey.bones.007, via a mobile device, Apr 6, 2016
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  5. LOLWRX

    LOLWRX Greenie Member

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    Just threw in a new set of NGK plugs for the summer. Gapped them to right around .025
     
    LOLWRX, via an iPhone, Apr 6, 2016
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  6. Awafrican

    Awafrican Silver Member

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    I'll be gapping mine at 0.28" as per my tuner ( Justin @ freektune )
     
    Awafrican, via a mobile device, Apr 6, 2016
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  7. phate

    phate Motorhead

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    Added stock heat range Iridium IX. Copy/paste into your copy/paste ;)
     
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  8. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    Anyone in here experience a lot greater plug life with the copper rod coilpack mod? I've heard it also eliminate all spark blowout at high IDCs too.
     
  9. John

    John Full Fledged Member Platinum Member

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    I gap in mm; suggest to add specs to OP

    Sent from my XT1095 using Tapatalk
     
    John, via a mobile device, Apr 9, 2016
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  10. Awafrican

    Awafrican Silver Member

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    Guys in the USA and gaps in mm? The fuck is wrong with you? Hell I'm in Canada where we use real numbers and I gap in inch. Jokes aside I'm finishing up some shift work and when I can get to the comp tomorrow I'll update OP with mm and other edit suggestions
     
    Awafrican, via a mobile device, Apr 9, 2016
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  11. Darthxar

    Darthxar Gold Member

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    I bought a ton of those on Amazon during a sale for about 5 bucks each. I've been changing them every 15k miles cuz I'm at pretty high boost and drive hard, but they have been fine so far.

    Sent from my XT1575 using Tapatalk
     
    Darthxar, via a mobile device, Apr 9, 2016
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  12. Orangatang

    Orangatang Greenie Member

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    Is there still a fight going on between denso and ngk step colder and which one is better.
     
  13. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    My tuner told me he'd never do Densos again because apparently he's seen bits fall off into the cylinders (not sure what--ground electrode, ceramic, etc.). He told me step-colder NGKs for me, so that's what I've run.
     
  14. Orangatang

    Orangatang Greenie Member

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    Thanks. I am going to get the ngk and give them a try. Need to replace plugs soon anyways.
     
  15. John

    John Full Fledged Member Platinum Member

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    Hahaha. The car is in metric, the spec was developed in metric, I have metric feelers, why not? Plus this is Detroit. The American auto industry has been on metric for decades now, except the occasional old carryover parts. Therefore I've been metric in my day job for decades too. It just seems normal to me to work in metric. Besides, fractions? Pshaw, ain't nobody got time fo dat.
     
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  16. Awafrican

    Awafrican Silver Member

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    OP Updated

    do we know for sure that both 6509 and 3787 (NGK stock range) fit?
     
  17. phate

    phate Motorhead

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    6509 (LTR6IX-11) is just 1 step warmer (stock heat range) than 6510 (LTR7IX-11). Otherwise they're identical. They both have a 1.1mm gap (.043") out of the box and need the gap tightened.

    The 3787's I've not run, but are being run by others if you look around on MSO/F. They have the more ideal 0.8mm gap (.031"), but should still be checked.
     
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  18. John

    John Full Fledged Member Platinum Member

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  19. Gizmo

    Gizmo Good news, everyone! Platinum Member

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    Picked up and installed a set of Autolite Iridiums XP5364 no issues with installing them, but all of them had to be re-gaped to .027 as they where all .040 out of the box
     
  20. VTMongoose

    VTMongoose John/MD1032 Platinum Member

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    Add the Gen2 OE plugs to the list - NGK laser iridium - SILTR6A7G. Pre-gapped at 0.028" (my newest set measured around 0.026-0.027). I use these instead of the IX's because of the doubled (60k mile) service life. I've never had issues with the gap widening over time with these either.
     
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