05-10-2010
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#1
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Brian Spilner called...
Join Date: Jan 2009
Location: Cloud
Drives: RR EVO Viii 493AWHP Spilner Mobile(sold)
Posts: 451
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Spark Plug Gap?
What are people running for a gap on their spark plugs?
NGK R plugs, magnacore 8.5 wires, E85 and 26psi
OEM says 32, my car would studder and missfire
Was tuned on 25 gap, it had a few misfires at first then LOTS
brought it down to 20 (my lowest gap) and had random misfires...
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I Like Cheese
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05-10-2010
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#2
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Re: Spark Plug Gap?
If your still getting misfires at .020 then id check your wires, they could be arcing out.
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20g Mafia
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05-10-2010
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#3
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Re: Spark Plug Gap?
he has low compression in a cylinder...
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05-10-2010
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#4
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Re: Spark Plug Gap?
Wait is it misfiring under boost or all the time?
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20g Mafia
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05-10-2010
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#5
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Brian Spilner called...
Join Date: Jan 2009
Location: Cloud
Drives: RR EVO Viii 493AWHP Spilner Mobile(sold)
Posts: 451
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Re: Spark Plug Gap?
Randomly, but only under boost.
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I Like Cheese
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05-10-2010
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#6
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Re: Spark Plug Gap?
Id check for bad wires.
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20g Mafia
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05-10-2010
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#7
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is Nashty
Join Date: Oct 2007
Location: Stillwater
Drives: Cyborg from Japan
Posts: 2,080
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Re: Spark Plug Gap?
Yeah .020" is a very small gap. Most I would ever go down to is .024".
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-1990 Mitsubishi Cyborg 4WD-
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05-10-2010
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#8
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Brian Spilner called...
Join Date: Jan 2009
Location: Cloud
Drives: RR EVO Viii 493AWHP Spilner Mobile(sold)
Posts: 451
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Re: Spark Plug Gap?
should i bring it back up from 20 to 24? ill check all the wires over tomorrow.
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I Like Cheese
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05-10-2010
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#9
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is Nashty
Join Date: Oct 2007
Location: Stillwater
Drives: Cyborg from Japan
Posts: 2,080
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Re: Spark Plug Gap?
I would. Ideally you want to make the gap as big as possible without blowing out the spark. I would be testing other things to figure out why your misfiring. Time to swap out ignition parts.
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-1990 Mitsubishi Cyborg 4WD-
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05-10-2010
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#10
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Brian Spilner called...
Join Date: Jan 2009
Location: Cloud
Drives: RR EVO Viii 493AWHP Spilner Mobile(sold)
Posts: 451
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Re: Spark Plug Gap?
where would you start?
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I Like Cheese
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05-10-2010
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#11
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is Nashty
Join Date: Oct 2007
Location: Stillwater
Drives: Cyborg from Japan
Posts: 2,080
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Re: Spark Plug Gap?
NGK's at .028" is where I have mine at. 60-1 @ 25psi, E85. No issues at all.
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-1990 Mitsubishi Cyborg 4WD-
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05-10-2010
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#12
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flips McGee
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Re: Spark Plug Gap?
new spark plug wires and maybe try a different set of coils. My 2G would do this horribly on an 'ok' looking set of magnicores. I bought a set of the Taylor 10mm wires and the thing ran like a dream! Get a set, and set to about .024, that's about as low as you should go on pump gas car.
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Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
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Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
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Quote:
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Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
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05-10-2010
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#13
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Brian Spilner called...
Join Date: Jan 2009
Location: Cloud
Drives: RR EVO Viii 493AWHP Spilner Mobile(sold)
Posts: 451
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Re: Spark Plug Gap?
Instead of getting new wires and hoping nothing is wrong with my coilpacks could i just go with a COP system?
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I Like Cheese
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05-10-2010
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#14
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Spark Plug Gap?
At 32psi on E85, I had to have mine set to around .019 to avoid miss-firing. .018 is the lowest I've heard of anyone running, and is the lowest I'd ever go because that is getting really small.
I decided to get an Arc-2 unit so that I could open my gap back up, but I'm still having the same issue even after the Arc-2 install. My wires are Taylor 10mm's, I've tried BRP6's and BPR7's, I've got a 'different' (wouldn't call them new) set of coils. I'm still having to run around the same gap to avoid miss-firing at 32psi. At 25psi, I'm usually OK around a .024 gap, but I find myself having to change out plugs every few weeks which sucks.
I may get rid of my taylor wires and try something else, just not sure which yet. I might just go back to OEM NGK wires.
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05-10-2010
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#15
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Reynolds number user
Join Date: Oct 2003
Location: grove/tempe
Posts: 3,553
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Re: Spark Plug Gap?
Quote:
Originally Posted by Cammaxon
Instead of getting new wires and hoping nothing is wrong with my coilpacks could i just go with a COP system?
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If you do make sure to get a really good one, like a sparktec. 99% of the COP kits out there use chrysler 300m coils or other random shit that is more often than not inferior to the stock coils.
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07 Ducati Monster S4R
00 honda elite 50 (64 mph braH!)
05 malaguti F15
04 E55 AMG
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05-10-2010
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#16
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flips McGee
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Re: Spark Plug Gap?
For the money, I would skip the COP and just get a good working stock system first. If the COP messes up, how will you know? New wires are cheap and a used set of coils can be had for cheap as well. Try them first.
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
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Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
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Quote:
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Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
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05-10-2010
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#17
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Re: Spark Plug Gap?
Um, what kinda coils does sparktek use? I emailed them about it and they never told me what kind of coils they use.
Quote:
Originally Posted by Super Bleeder!!
If you do make sure to get a really good one, like a sparktec. 99% of the COP kits out there use chrysler 300m coils or other random shit that is more often than not inferior to the stock coils.
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20g Mafia
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05-10-2010
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#18
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Admin
Join Date: Oct 2003
Location: Sportsman's Paradise, LA.
Posts: 5,382
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Re: Spark Plug Gap?
I run mine around .026-.028 and it works fine for me. A lean mixture can add to the problem also.
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"You don't have a clue. You couldn't get a clue during the clue mating season in a field full of horny clues if you smeared your body with clue musk and did the clue mating dance."
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05-10-2010
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#19
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Reynolds number user
Join Date: Oct 2003
Location: grove/tempe
Posts: 3,553
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Re: Spark Plug Gap?
Quote:
Originally Posted by blackrosenova400
Um, what kinda coils does sparktek use? I emailed them about it and they never told me what kind of coils they use.
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Yea good luck with that. Maybe call AMS next and ask what wheels they use on the 850R turbo 
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07 Ducati Monster S4R
00 honda elite 50 (64 mph braH!)
05 malaguti F15
04 E55 AMG
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05-10-2010
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#20
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Re: Spark Plug Gap?
Yeah its probably because they use the 300m coils as well which deglorifies there whole company.
Quote:
Originally Posted by Super Bleeder!!
Yea good luck with that. Maybe call AMS next and ask what wheels they use on the 850R turbo |
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