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Spark plugs #227892 Jul 20, 8:55am Jul 20, 8:55am
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mv6845 OP
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Spark plugs
When do you replace your spark plugs? 30k, 60k.

Re: Spark plugs [Re: mv6845] #227893 Jul 20, 9:38am Jul 20, 9:38am
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Re: Spark plugs [Re: ppeddy] #227894 Jul 20, 11:11am Jul 20, 11:11am
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I concur.


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Re: Spark plugs [Re: l2pdrums] #227895 Jul 20, 4:42pm Jul 20, 4:42pm
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when do "I"? Clean them every 3000 or before every race if I'm racing during that season. Replace every 9000. But that's just me. grin


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Re: Spark plugs [Re: QTRMLR_1] #227896 Jul 20, 7:42pm Jul 20, 7:42pm
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Originally Posted by QTRMLR_1
when do "I"? Clean them every 3000 or before every race if I'm racing during that season. Replace every 9000. But that's just me. grin


They are Iridium aren't they? Those suckers are good for a minimim 60,000 miles. The only time you would fowl them is if you are chipped & running rich.

Re: Spark plugs [Re: Haulin_A_Doo] #227897 Jul 21, 1:14am Jul 21, 1:14am
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That was for what I would do with the stock ones. yeah I know, but I'm obsessive about Performance so I pull them often and make sure they are clean. Just in case anyone is curious about the Denso Iridiums, I felt about a 5 hp increase after popping them in (don't ask if I dynoed). The cost is $13.99 per plug.


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Re: Spark plugs [Re: QTRMLR_1] #227898 Jul 21, 5:59am Jul 21, 5:59am
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Is it ok to run Bosch Plat 4 plugs?

Re: Spark plugs [Re: mach_y] #227899 Jul 21, 6:34am Jul 21, 6:34am
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sure, but Densos are better for N/A IMO.


I get my kicks on EC.
Re: Spark plugs [Re: QTRMLR_1] #227900 Jul 21, 6:35am Jul 21, 6:35am
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Re: Spark plugs [Re: mach_y] #227901 Jul 21, 7:56pm Jul 21, 7:56pm
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Originally Posted by mach_y
Is it ok to run Bosch Plat 4 plugs?


Check the left side of the cylinder head there is a warning label specifically requesting Iridium plugs only...at least there is on my motor...you can run the Bosch but there maybe a Performance issue/durability issue.


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Re: Spark plugs [Re: GreyGhost2k2] #227902 Jul 22, 1:28am Jul 22, 1:28am
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...since platinum is a colder plug than iridium I would say a Performance issue for N/A cars. But if that person insists on running low octane gas like 89, the colder platinum plugs could actually be a blessing, being less likely to cause detonation, which is always bad.


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Re: Spark plugs [Re: GreyGhost2k2] #227903 Jul 22, 1:32am Jul 22, 1:32am
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Originally Posted by GreyGhost2k2
Originally Posted by mach_y
Is it ok to run Bosch Plat 4 plugs?


Check the left side of the cylinder head there is a warning label specifically requesting Iridium plugs only...at least there is on my motor...you can run the Bosch but there maybe a Performance issue/durability issue.


And I should state to err on the side of caution, that if one puts nitrous or a Turbo on your car, it would be best to ignore this warning and go with colder plugs by several heat ranges to be less likely to provoke detonation.


I get my kicks on EC.
Re: Spark plugs [Re: QTRMLR_1] #227904 Jul 22, 6:18am Jul 22, 6:18am
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I put the plat plugs in a stock 2000 GT, and there are no plans to do any engine mods to it. Should I pull these back out and put in iridiums?

Re: Spark plugs [Re: QTRMLR_1] #227905 Jul 22, 11:43am Jul 22, 11:43am
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Originally Posted by QTRMLR_1
Originally Posted by GreyGhost2k2
Originally Posted by mach_y
Is it ok to run Bosch Plat 4 plugs?


Check the left side of the cylinder head there is a warning label specifically requesting Iridium plugs only...at least there is on my motor...you can run the Bosch but there maybe a Performance issue/durability issue.


And I should state to err on the side of caution, that if one puts nitrous or a Turbo on your car, it would be best to ignore this warning and go with colder plugs by several heat ranges to be less likely to provoke detonation.


So we (GT owners) do not need Iriudium Plugs...I am kinda confused so try and bare with me...

If I run regular octane (cheapo stuff) then a Platinum Plug is fine (since it is "colder" meaning it can endure lower temperatures)
but if..
I run an Iridium plug ("hotter" meaning it can enure high temperatures) it is over kill for stock unless I have NO2 / a Turbo / or both, where engine temps are hotter and the higher temp would be a "normal" operation for these mods.

Is this what you are saying...or am I reversing something... (Platinum < Iriudium) for temp rating...I hope this makes sense...anyway I am out of the office in a bit but I'll be back around later tonight.

Oh one more thought, since the GT is a high reving engine for its power band then wouldnt' the Iridiums be better for longer life and less chance of detonation.

Sorry bout the length...I am doing some Calculus III while thinking here rofl


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Re: Spark plugs [Re: GreyGhost2k2] #227906 Jul 22, 11:48am Jul 22, 11:48am
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Originally Posted by GreyGhost2k2
Originally Posted by QTRMLR_1
Originally Posted by GreyGhost2k2
Originally Posted by mach_y
Is it ok to run Bosch Plat 4 plugs?


Check the left side of the cylinder head there is a warning label specifically requesting Iridium plugs only...at least there is on my motor...you can run the Bosch but there maybe a Performance issue/durability issue.


And I should state to err on the side of caution, that if one puts nitrous or a Turbo on your car, it would be best to ignore this warning and go with colder plugs by several heat ranges to be less likely to provoke detonation.


So we (GT owners) do not need Iriudium Plugs...I am kinda confused so try and bare with me...

If I run regular octane (cheapo stuff) then a Platinum Plug is fine (since it is "colder" meaning it can endure lower temperatures)
but if..
I run an Iridium plug ("hotter" meaning it can enure high temperatures) it is over kill for stock unless I have NO2 / a Turbo / or both, where engine temps are hotter and the higher temp would be a "normal" operation for these mods.

Is this what you are saying...or am I reversing something... (Platinum < Iriudium) for temp rating...I hope this makes sense...anyway I am out of the office in a bit but I'll be back around later tonight.

Oh one more thought, since the GT is a high reving engine for its power band then wouldnt' the Iridiums be better for longer life and less chance of detonation.

Sorry bout the length...I am doing some Calculus III while thinking here rofl



calculus III ?!?!? what fun ! rofl


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Re: Spark plugs [Re: CaLiGTS] #227907 Jul 22, 2:11pm Jul 22, 2:11pm
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Re: Spark plugs [Re: Steven] #227908 Jul 22, 2:57pm Jul 22, 2:57pm
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^^sorry I don't have time to explain now...gotta run some errands and will back later tonight if you're up hehe.


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Re: Spark plugs [Re: CaLiGTS] #227909 Jul 22, 8:21pm Jul 22, 8:21pm
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Originally Posted by CaLiGTS
Originally Posted by GreyGhost2k2
Originally Posted by QTRMLR_1
Originally Posted by GreyGhost2k2
[quote=mach_y]Is it ok to run Bosch Plat 4 plugs?


Check the left side of the cylinder head there is a warning label specifically requesting Iridium plugs only...at least there is on my motor...you can run the Bosch but there maybe...


So we (GT owners) do not need Iriudium Plugs...I am kinda confused so try and bare with me...



calculus III ?!?!? what fun ! rofl


i meant cal II , but even still shitty...cal III is next semester frown


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Re: Spark plugs [Re: Steven] #227910 Jul 22, 8:28pm Jul 22, 8:28pm
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Originally Posted by Steven



Thanks thumbsup

...aside from some terminology mix ups I basically got it. I am sticking with the Denso Iridiums


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Re: Spark plugs [Re: GreyGhost2k2] #227911 Jul 23, 2:46am Jul 23, 2:46am
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Originally Posted by GreyGhost2k2
Originally Posted by Steven



Thanks thumbsup

...aside from some terminology mix ups I basically got it. I am sticking with the Denso Iridiums


yeah I checked out that site (with a good name for business!) and like the price on the Denso Iridiums: $11.99 but that's probably without shipping right? Autozone charged me $13.99/plug but I just had to pay tax.


I get my kicks on EC.
Re: Spark plugs [Re: mach_y] #227912 Jul 23, 2:57am Jul 23, 2:57am
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Originally Posted by mach_y
I put the plat plugs in a stock 2000 GT, and there are no plans to do any engine mods to it. Should I pull these back out and put in iridiums?


You should get better Performance with the iridiums, especially denso iridiums, over the platinum. Does anyone know the specs on the stock iridiums, like diameter of center electrode, etc? I pulled those out a long time ago when I didn't know any better and went with platinum. It would be funny if the stock iridiums were actually made by denso, but I'm not sure if Toyota would go that lavish stock.


I get my kicks on EC.
Re: Spark plugs [Re: QTRMLR_1] #227913 Jul 23, 11:20am Jul 23, 11:20am
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Originally Posted by QTRMLR_1
Originally Posted by mach_y
I put the plat plugs in a stock 2000 GT, and there are no plans to do any engine mods to it. Should I pull these back out and put in iridiums?


You should get better Performance with the iridiums, especially denso iridiums, over the platinum. Does anyone know the specs on the stock iridiums, like diameter of center electrode, etc? I pulled those out a long time ago when I didn't know any better and went with platinum. It would be funny if the stock iridiums were actually made by denso, but I'm not sure if Toyota would go that lavish stock.


Denso Iridium plug 3324 SK16R11 0.044 $9.35 <---These came stock in my car...I wish I had seen sparkplugs.com earlier this site has a decent prices...my local A/Z didn't even have this plug listed in thier computer.


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Re: Spark plugs [Re: GreyGhost2k2] #227914 Jul 23, 12:24pm Jul 23, 12:24pm
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What's interesting is those numbers don't match the part numbers on sparkplugs.com for the premium class (and more expensive) denso iridiums. Perhaps they changed in 4 years and improved them? Or just simply changed the numbering?


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Re: Spark plugs [Re: QTRMLR_1] #227915 Jul 23, 12:28pm Jul 23, 12:28pm
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There are two grades of denso iridium available on sparkplugs.com: super and premium with premium being better. I'd guess Toyota put the super or something close to that at the time in the stock car.


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