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7 spark plugs just a bandaid?

Posted by bcjjones, Sep 20, 2013

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  1. bcjjones

    bcjjones Proven Member

    510
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    Joined Nov 3, 2011
    Austin, Texas
    My current set up is a 1991 gvr4 with a bastard 20g internally gated, fic 950s, 1g vrsf intercooler kit, fp2 cams and a walbro 255. Running 20 psi on 93 octane, with afrs about 10.5 to 11 by redline.

    Im having a problem with spark blow out. I bought some brand new 6's and gapped them at .025. It helped but still blows out at full throttle, it won't at part throttle though. So i regapped them down to .020 and I still have blow out.

    Should I now try switching to some 7's or is that just a bandaid to a weak ignition problem?
     
  2. YanDsm

    YanDsm Proven Member

    152
    3
    Joined Jun 2, 2010
    Thetford Mines, QC, Canada
    I run a similar setup and I had bad misfire last month at 15+psi so I changed my good but not new spark plug wires for new NGK 7mm wires and now no more misfires. I run BR7ES gapped at .028. For your setup you should run 7es plugs but forget the BPR and run the BR they are better if you really get spark blowout.
     

    577  0

    1993 Eagle Talon TSi AWD
    · 1G DSM
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  3. Greedy Pimp

    Greedy Pimp Proven Member

    253
    3
    Joined Mar 27, 2009
    Newark, California
    If your running bpr6es try some br7es which are motorcycle plugs and dont protrude as much as normal plugs. Gap them at .020 and see if that works. If not gap them down more and more like .018,.016,.014, u shouldn't half to go that low.
     

    751  4

    1992 Mitsubishi Eclipse GSX
    11.690 @ 121.650 · 1G DSM
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  4. Tyeler18

    Tyeler18 Proven Member

    2,318
    79
    Joined Dec 16, 2008
    Casa Grande, Arizona
    Yea the non project (BR6ES) plugs have helped quite a few (myself included) with blow out. With your gap being that tight, I'd look into a set of BR7ES plugs and be done with it.
     

    Drag Race Build 948  1

    1991 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

    Road Race Build 900  0

    1990 Eagle Talon TSi AWD
    manual · 1G DSM

    Autocross Build 1K  0

    1998 Mitsubishi Eclipse GSX
    manual · 2G DSM

    Road Race Build 1K  0

    1991 Mitsubishi Galant VR-4
    manual · Galant VR-4
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  5. bastarddsm

    bastarddsm Proven Member

    5,290
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    Mendota, Illinois
    Wow, don't listen to any of these guys. So much wrong info. A stock ignition setup should support what your trying to do. You need to make sure your wires are good and the coils are clean and the plugs are new and at about .025" gap. Lean it out a bit too. No reason to go past 12 on gas

    Changing heat range will have no effect on blow-out.

    Going to a non projected plug should help blow out, but it also has the effect of retarding the timing a few degress

    Going to non projected plugs and cooler plugs have more of an effect on fighting detonaton.

    For reference, I run BR8ES at 0.024 and 35psi with stock wires and no box.
     

    Showcar Build 6K  1

    1991 Eagle Talon N/T
    9.805 @ 144.00 · 1G DSM
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  6. YanDsm

    YanDsm Proven Member

    152
    3
    Joined Jun 2, 2010
    Thetford Mines, QC, Canada
    BastardDsm, you're right about plugs heat range has nothing to do with spark blowout. I was just suggesting to go with BR plugs for the blowout and for that setup I think that the 7's plugs are a better choice.
     

    577  0

    1993 Eagle Talon TSi AWD
    · 1G DSM
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  7. Archer Fabrications

    Archer Fabrications Proven Member

    9,964
    966
    Joined May 9, 2011
    Scottsdale, Arizona
    I run br7es gapped to 0.020 I'll be getting te iridiums since evos run them. Probably get 8's nom purtruding
     

    1K  17

    2006 Evo 9 MR
    awd · manual · Lancer Evolution
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  8. My1GLaser

    My1GLaser Proven Member

    1,565
    27
    Joined Dec 4, 2006
    Bartow, Florida
    Stock coils? Are they grounded well? I actually added an extra ground wire from mine to the chassis since they are relocated.

    It could be plug wires. I had the same issue last year and had to replace mine. They were only 5 year old NGK wires with about 20k miles on them and they "looked" fine.

    Go to advanceautoparts.com put the NGK wires in your shopping cart and put in the promo code ES123 and pick them up at a local store for about $35 :thumb:
     

    2K  0

    1992 Mitsubishi Eclipse GSX
    11.420 @ 121.980 · 1G DSM
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  9. EVO9_Inside

    EVO9_Inside Proven Member

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    Joined Aug 6, 2011
    akron, Ohio
    agreed, your just trying to cover up a problem, buy new wires and set your gap back to factory and see where it leads you.
     
  10. rnitto

    rnitto Proven Member

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    Morristown, New Jersey
    +1 Check wiring & grounds for the coils & wires.
     
  11. Dude McGee

    Dude McGee Proven Member

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    Joined Aug 4, 2013
    Joliet, Illinois
    20g.....20 psi.......93 octane.......WOT AFRs recommendation 12 or higher?
     

    497  0

    1993 Eagle Talon TSi AWD
    · 1G DSM
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  12. DRTredHEAD

    DRTredHEAD Proven Member

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    Joined Oct 19, 2009
    Bedford, Texas
    12 or lower. WOT 93 oct you want to shoot for 11.3-11.7 max 12+ is way too lean for pump. E85 eh ok but 93 11.3
     
  13. Dude McGee

    Dude McGee Proven Member

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    Joined Aug 4, 2013
    Joliet, Illinois
    Yeah I know, but OP said 11 afr, and I saw "lean it out, no reason to go past 12 on gas," so I assumed it meant 12 or higher, and I couldnt help but think WTF?
     

    497  0

    1993 Eagle Talon TSi AWD
    · 1G DSM
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  14. bastarddsm

    bastarddsm Proven Member

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    Joined Aug 26, 2003
    Mendota, Illinois
    Yeah, I'd be shooting for around 12 to 1. Fatter just costs power.
     

    Showcar Build 6K  1

    1991 Eagle Talon N/T
    9.805 @ 144.00 · 1G DSM
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