July 03, 2020, 12:32:29 PM

Author Topic: New recommended spark plug  (Read 271 times)

Offline bamsho

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New recommended spark plug
« on: March 29, 2020, 06:01:20 PM »
Well since FMC discontinued the SP542 plugs,  I thought the SP578 was the correct one, since the number supercedes the SP542.  Come to find out that I should running M-12405-35T.  Which is basically the plugs for the FORD GT with the EcoBoost motor.  From what I was told that the 542s where fouling out. 

I'll see how the 578s working for now, then switch over.  The 578s are colder than the 534s I was running.

Oh here are the 534s I pulled out, I put new plugs in when I switched tuners.  I had some gap growth of .007.  Plugs where gapped at .026.  I had the same growth when running Livernois tunes. 

First pic is cylinders 1, 2, 3. Second is cylinders 4, 5, 6.

Yes I was told I didn't drive my car very angrily.  Haha
2013 white Gen 5.  Gearhead Intercooler, Turbosmart wastegate actuators, Alky Controls meth kit, Livernois catted downpipes,  Livernois Corsa cat back black etched tips.  2016 True Street Champion.

Offline StealBlueSHO

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2016 Taurus SHO Performance Pack, Gearhead Custom Tunes, Gearhead Gen3 Turbos, Gearhead Intercooler, Gearhead 170 Tstat, EPP Dual Feed Intake, EPP Hot Pipes, EPP Ceramic Coated Catted Downpipes, Corsa Exhaust, XDI-35 Fuel Pump, DW In-Tank Fuel Pump, Fuel-It Bluetooth Ethanol Analyzer, HR Lowering Springs, AD Lower Trans Mounts, 3Bar MAP, SP-542 Plugs, Custom SHO Puddle Lights, Custom Gearhead emblem overlays. Best time currently is 11.922 @ 115mph full weight, stock wheels, stock tires... just like it came off the show room floor.


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