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Old Jul 27, 2008, 05:00 PM   #1
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question about my spark plug gap

so i just change my spark plugs, i was reading around .026-.028 for spark plug gap
when i took out my stock ones, they were about .022-.024.....so i just gapped it at .025 is this bad ??

i'm running sun hyperforce also if that matters, 91oct/25psi/353whp/276wtq

heres a pic of my stock ones 25k miles, can someone diagnose them?
Click the image to open in full size.
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Old Jul 27, 2008, 06:36 PM   #2
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ngk ones usually come already around .027-.028, so you don't have to change it, but the stock ones will come with a smaller gap to be safer so you don't misfire it, so if you changed it to .025, you should be fine as long as you're not misfiring or anything, and your stock ones look pretty beat up, good idea that you changed them
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Old Jul 27, 2008, 06:46 PM   #3
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i just changed mine and i gapped them to .022
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Old Jul 27, 2008, 07:10 PM   #4
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i just use ngk's and keep the stock gap that they set at .028ish. also 25psi seems high for 91oct. just my .02
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Old Jul 27, 2008, 07:46 PM   #5
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my engine won't blow right? if my gap measure lightly touched the electrode when i checked gap? >.<
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Old Jul 27, 2008, 08:40 PM   #6
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OEM NGK sparkplugs are gapped at around 0.022. i have changed at least 3 sets... I dont keep sparkplugs on the car more than 4000 miles...

The 1-step colder NGK racing ones that i was using before they were gapped at 0.024 and along with the Sun Hyperforce no misfires, only until recently where the gap had opened to a crazy 0.028 and the car was misfiring like crazy (thus and my poor track results until now...)

Couple of days ago changes my oil, filter and sparkplugs with a set of Denso IKH24s, 1-step colder than originals... They were gapped 0.022 or 0.023, i dont remember and the car runs like a champ again...

For EVO VIII people: Dont get confused... The IXs have completely different sparkplugs and sparkplug gapping...
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Old Jul 27, 2008, 08:50 PM   #7
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what about these, http://www.amazon.com/NGK-Laser-Irid...7216949&sr=8-1


they work for the evo ix, but they're not the oem ones since they charge so much, they were gapped less than .020
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Old Jul 27, 2008, 08:51 PM   #8
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i guess i'll regap them to .022
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Old Jul 27, 2008, 09:34 PM   #9
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I usually gap my ngk bpr8es to .026 - no problems
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Old Jul 28, 2008, 10:35 PM   #10
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i think evo8 and evo9 is different

i just regapped to .022 today, and it drives fine and better then my 25k old iridiums =D
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Old Jul 28, 2008, 11:31 PM   #11
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BPRES7 coppers for the win. Supper cheap, it is like 14 bucks every time I change the oil. As for Gap .025 and no misfire
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Old Jul 29, 2008, 12:19 AM   #12
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BPRES7 coppers for the win. Supper cheap, it is like 14 bucks every time I change the oil. As for Gap .025 and no misfire
He has a Evo 9.
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Old Aug 31, 2009, 10:38 PM   #13
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Quote:
Originally Posted by SpooksEvo View Post
BPRES7 coppers for the win. Supper cheap, it is like 14 bucks every time I change the oil. As for Gap .025 and no misfire
14 bucks? I think you got ripped off!! I pay $8 every time.
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Old Sep 1, 2009, 04:21 AM   #14
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copper ngk ftw =] buy a whole box, they arent expensive and its to easy to change
plus i believe they come pregapped
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Old Mar 21, 2010, 09:21 PM   #15
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I have an EVO 8 I use NGK BPR8ES. Gap at .020.
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Old Mar 21, 2010, 09:21 PM
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