Spark Plug Data Base

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

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  1. John

    John Full Fledged Member Platinum Member

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    Actually according to the gen2 shop manual:
    Spark plug tightening torque 10-14 N-m (102-142 kgf-cm, 89-123 in-lbf)
    Spark plug gap
    Standard:L 0.60-0.80 mm (0.024-0.031 in)
    New spark plug (reference): 0.60-0.70 mm (0.024-0.027 in)

    Have the specs changed over time? What is the source for your original walues?
     
  2. Awafrican

    Awafrican Silver Member

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    To my knowledge they have not changed, source of information is trial and error from tuners and the community this is the recommended gap that I believe all tuner will recommend, unless they're trying something unique on an individual basis.
     
    Awafrican, via a mobile device, Oct 28, 2016
    #22
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  3. VTMongoose

    VTMongoose John/MD1032 Greenie Member

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    The Gen1 and Gen2 plugs are different part numbers, but the same plug, other than the gap was tightened to 0.028 from 0.031 going to the Gen2's. Both are made by NGK.

    Edit: I don't think the spec itself changed. I should verify in a speed6 or Juan manual later.
     
    Last edited: Oct 28, 2016
  4. SavSpeedMS3

    SavSpeedMS3 JRico32 Greenie Member

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    Subscribed - just ordered NGK's from Edgeautosport - stock heat range
     
  5. GCPhotographers

    GCPhotographers Greenie Member

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    I didn't post in a while but these suck. Two month after install, I had to change them again...right around my zzb. I've been running ngk 1 step ever since. I am looking for 2 but we will see especially how hot it gets here....I think colder plugs with help with the assist of e85 and MAYBE meth

    Another note, rockauto is the cheapest overall outside amazon for the ngk 1 step
     
  6. schmidtyty

    schmidtyty Greenie N00B Member

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    i just got a 2012 speed 3 with 71k on it and i planning on driving it from Seattle to LA this summer when the only mod i have is an AEM intake that came on the car and an access port that i just got (debating on fuel pump internals) should i go with the Colder or the stock heat NGKs?
     
  7. GCPhotographers

    GCPhotographers Greenie Member

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    With what you have, stock is fine
     
  8. Awafrican

    Awafrican Silver Member

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    Stay stock heat range plugs, I use NGK these days also what my tuner (freektune) recommends. Also get the fuel pump internal upgrade that should be the first upgrade on this platform especially on the gen2 prior to starting any performance modifications. But I digress as this is a sparkplug thread.

    Sent from my SM-N910W8 using Tapatalk
     
    Awafrican, via a mobile device, Jun 16, 2018
    #28
  9. mangosmoothie

    mangosmoothie Platinum Member

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    Some people say the step colder NGK plugs, 6510's are being discontinued, some they're just backordered right now.

    has anyone ever used these NGK 90543 ILTR7E9 Laser Iridium Plug, or know any reason why we couldn't? https://www.ngk.com/product.aspx?zpid=40118



    They're step colder in the laser iridium series. (6510's are simply iridium) I can't find mention of them anywhere on the forums. The laser iridium series is what the OEM plug (SILTR6A7G 95369) and NGK ILTR6A-8G (3787) are part of. I have not seen a step colder laser iridium plug mentioned anywhere. I'm not here to debate which heat range plug to use, just if your tuner or yourself decides step colder, would these be an alternative to 6510's?

    I found them using the NGK advanced look up tool and entering the data found from the 3787 and 95369, just one heat range colder (higher heat range is a colder plug. so 7 is a colder plug than stock 6) https://www.ngk.com/search.aspx?ptn=Spark+Plug&data=13:14mm|16:Tapered|29:Yes|15:25mm+(1")|14:5/8"+(16mm)|19:Solid|180:ISO|21:Iridium|20:Fine+Wire|24:platinum|23:Standard|298:NGK|18:7&s=1#results

    What's also interesting the number of plugs if you enter the data directly from the 3787. 2 other plugs come up that I can find no mention of people using. https://www.ngk.com/search.aspx?ptn=Spark+Plug&data=13:14mm|16:Tapered|29:Yes|15:25mm+(1")|14:5/8"+(16mm)|19:Solid|180:ISO|17:.031"+(0.8mm)|21:Iridium|20:Fine+Wire|24:platinum|23:Standard|298:NGK|18:6&s=1#results

    Are there differences in these plugs I'm not seeing? Different part # for all 3, but same price. Are these additional options for stock heat range laser iridium plugs?
     
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  10. VTMongoose

    VTMongoose John/MD1032 Greenie Member

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    I've never found a laser iridium plug that said that it fit our cars. I'm not finding anything of the sort with this one, either. The problem with a lot of these random plugs is that even if they appear to fit and are the same size and thread pitch, sometimes they can be slightly shorter/longer, or have other dimensional differences. I think the only way to find out is to order one and see what you get.

    Personally I can say I never had any issues with running the OEM plugs at ~360-370 whp in my pu on 2:10 in-tank methanol or E33. They definitely ran hot based on where the annealing mark ended up after hard usage, but I still got 70k out of my first set and another 40-50k out of my second set with no issues and never had any tuning issues with them. I still recommend the OEM plugs for most people, especially in a daily driven application where unless you go WOT frequently, the colder plugs will carb up fast and cause misfires.
     
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