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 ...
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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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.
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
NO OIL LEAKS!!
Purrs like a kitten! It's called maintenence. This shouldn't surprise people.
Last edited by DBCooper; 04-20-2019 at 07:14 PM.
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 AT KO2s