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Thread: Resistor spark plugs or not?

  1. #1
    Join Date
    Jul 2015
    Location
    Decorah, Iowa
    Posts
    34

    Default Resistor spark plugs or not?

    Does the EFI system care if I run non-resistor race plugs? If I ever get this pile to run right, I want to add nitrous. This necessitates race plugs, and the only ones I can find in my heat range are non-resistor.

  2. #2
    Join Date
    Nov 2013
    Location
    Chicago IL
    Posts
    1,952

    Default

    The EFI system does not care. However, sometimes the coils do. LSx coils don't like a non-resistor plug. However, NGK does sell a Resistor Boot to use with non-resistor plugs. The IGN1A coils do not care.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  3. #3
    Join Date
    Dec 2009
    Location
    Connecticut
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    26,766

    Default

    You should use resistor type spark plugs with an EFI system, to suppress electrical noise/interference.
    (Unless it's a race only application and the non-resistor plug is the only heat range & dimensions available.)
    Also, certain spark plug wires (such as FireCore50), transmit far less electrical interference than other
    brands (low resistance and impregnated with ferrite molecular compound used to absorb RFI/EMI).
    http://www.yellowbullet.com/forum/sh....php?t=1325290 (Additional Information - Doug F., Chief EFI Engineer @ Holley)
    NGK also offers spark plug resistor caps to use with non-resistor type spark plugs:
    http://www.ngksparkplugs.co.za/produ...resistor-caps/ (NGK Spark Plug Resistor Caps)
    http://www.ngkpartfinder.co.uk/files...lug_Covers.pdf (NGK Spark Plug Resistor Caps)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  4. #4
    Join Date
    Jul 2015
    Location
    Decorah, Iowa
    Posts
    34

    Default

    I run a small block Ford with Holley Smart Coils & FireCore50 wires.

  5. #5
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,766

    Default

    That's a good combination. You should be fine with non-resistor type spark plugs.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  6. #6
    Join Date
    Jan 2016
    Location
    Wisconsin
    Posts
    54

    Default

    The link to Doug F's old post didn't recommend the need for a resistor plug. With the traditional distributor on a Sniper & HyperSpark system, is there a big need for one? I'm having a hard enough time finding a plug short enough to not hit the headers on a SBC.

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