SP578 plugs? - Page 2

SP578 plugs?

This is a discussion on SP578 plugs? within the F150 Ecoboost Performance forums, part of the F150 Ecoboost Garage category; Pulled the plugs today, 29,275 miles. Factory plugs were the SP550. All the gaps were between .028-.030. Plugs looked good for another 30k but since ...

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  1. #11
    Ecoboost Jr Member Thestreaker's Avatar

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    Pulled the plugs today, 29,275 miles. Factory plugs were the SP550. All the gaps were between .028-.030. Plugs looked good for another 30k but since I was already in there I changed them out anyway. New sp550s were gapped at .028. Still not sure why the ford system shows the 580 unless its the same as the 550, but from what I've read the 580 is same as 534 just new part number.

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  2. #12
    Ecoboost Veteran djfllmn's Avatar

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    Quote Originally Posted by Elmore328 View Post
    How about we get our resident Ford Parts guru involved and see if he can shed some light into this.

    Hey @djfllmn, can you give some valid information on stock motorcraft spark plugs for the 2.7 and the 3.5 and include ANY crosses, substitutes, or superseded part numbers? Inquiring minds want to know.
    2.7 -SP-542. they do not change

    3.5 1st gen -SP-534 changes to SP-580
    Elmore328 and Mikedick77 like this.
    2018 2.7 Supercab XLT sport Lightning blue
    1968 Thunderbird
    Past: 16 F150 5.0 , 14 F150 5.0, 07 F150 5.4, 03 Ranger 4.0
    Master Certified Ford parts and warranty administrator

  3. #13
    Ecoboost Veteran Scott91370's Avatar

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    Quote Originally Posted by djfllmn View Post
    3.5 1st gen -SP-534 changes to SP-580
    Is there any actual difference in the plug, that you know of?
    I guess eventually the 534 & 550 will just be out of stock?
    2015 Ingot Silver - 3.5 Ecoboost FX4

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    Ecoboost Sr Member Brignac's Avatar

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    Not meaning to hijack the thread but Is it still recommended to run the sp542s in a tuned and moded (my sig) 3.5L since they are 1 step colder plugs?
    2013 Screw cab F-150 FX4 Ecoboost Sterling Grey. UPR CC with CSS, SCT BDX tuner with MPT & BCB adaptive tunes, FullRace CAC kit, TS bov, FullRace catted DPs, Banks CAI, Bilstein 5100 all around leveled on 275/60/20 Falken Wildpeak AT3w tires on stock fx4 wheels.

  6. #15
    Ecoboost Jr Member Thestreaker's Avatar

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    Quote Originally Posted by Brignac View Post
    Not meaning to hijack the thread but Is it still recommended to run the sp542s in a tuned and moded (my sig) 3.5L since they are 1 step colder plugs?
    So I'm not a expert by any means but from my research and talking to MPT( never able to get in touch with 5star) they say just run stock heat range unless you're heavily modded such as turbos.

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  7. #16
    Gold Supporting Member Blown F-150's Avatar
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    Quote Originally Posted by Brignac View Post
    Not meaning to hijack the thread but Is it still recommended to run the sp542s in a tuned and moded (my sig) 3.5L since they are 1 step colder plugs?
    It really depends on the tune. It is honestly best to talk with your tuner and get their input. BCB and Gearhead pretty much always recommend the SP542's.

  8. #17
    Ecoboost Pro Mikedick77's Avatar

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    Good info here. I know my truck ran kinda shoddy with the SP-534's in it. I swapped over to Autolite Iridium XP's and it runs much better now. I'll have to give the 580's a shot. I assume some sort of revision.
    2013 Eco XTR 4x4 Super Crew 5.5 bed 3:31 Rear
    Stock, Weep hole, 160 degree T-Stat, Autolite Iridium XP5863 gapped properly, Castrol Magnatec 5w-30, and 93 octane
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  9. #18
    Ecoboost Pro Lizardking419's Avatar

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    Quote Originally Posted by Blown F-150 View Post
    It really depends on the tune. It is honestly best to talk with your tuner and get their input. BCB and Gearhead pretty much always recommend the SP542's.
    For the 1st Gen boost?

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  10. #19
    Gold Supporting Member DBCooper's Avatar
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    Quote Originally Posted by Brignac View Post
    Not meaning to hijack the thread but Is it still recommended to run the sp542s in a tuned and moded (my sig) 3.5L since they are 1 step colder plugs?
    Both of my tuners recommend the SP-542s gapped at 026-.028.
    Last edited by DBCooper; 04-20-2019 at 07:14 PM.
    ~Jim~
    2012 Lariat Screw; 3.5L; 4x4; 3.55 E-Locker; Lux/Tow Package;
    SCT X4; Tuning by MPT , BCB; 170* Rat Stat; Motorcraft SP-542s; Injen CAI; Roush Boost Gauge; Full Race TB Spacer; CAC Weep Hole; UPR Mega Can w/CSS Pro Valves; UPR Billet Breather; 3" Custom Magnaflow
    Exhaust; 3" Resonator Delete;Turbosmart BOVs; Bilstein 5100s; Leveled; 20% Window Tint; Full Interior LEDs; PIAA Heads/Fogs; Forscan; BFG 275/70/18 KO2s

  11. #20
    Ecoboost Jr Member Thestreaker's Avatar

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    Quote Originally Posted by DBCooper View Post
    Both of my tuners recommend the SP-542s gapped at 026-.028.
    What engine and 1st or 2nd gen?

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