I have narrowed it down to either motorcraft sp417 or sp509. What would you guys recommend for a 5.4 that will make 8psi of boost? I like motorcraft products and want to keep something that doesnt need changing every 30k miles because that is just dumb. So I'm keeping with a proven plug that will last up to 100k miles. I'm at stock boost now, but it will not be over 8psi in its life. Thanks in advance.

 

What year?

 

If yer boosted, yer fooling yerself by thinking you should run any plug to 100K.

Because there is NO such thing as a 100K plug outside of a Marketing Department (gap growth for one reason).

Changing them frequently to ensure the plugs (at least) are not gonna be the cause of any misfires ( nuisance fer N/A, Death fer boosted), is just a part of owning a boosted truck.

A maintenance regime that would be adequate for a N/A truck is not gonna cut it fer a boosted truck if you want it to live a long and healthy life.

MGD

 

autolite. hto



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Need to know the year............................

HT0's only fit 04 to mid 08 5.4's.

SP509's only fit mid 08+ 5.4's.

SP417's won't fit any 5.4's.

 

It is a 2008 with brown COPs. Lots of new trucks will go to 100k miles on their first set of plugs, even a factory s/c one can with stock boost and not been abused. It's not a myth put out by ford. I am speaking directly from experience. I have always maintained. All my cars by what the factory schedule was and have never had a single one break down, 10 different makes and models up to this day.

 

factory schedule on spark plugs was changed from 100k to 60k

boosted applications put more stress on sparkplugs also...especially if detonation is occuring

 

Brown cop 08 - the only plug that's been mentioned that will FIT is the SP-509, which is OEM, stock NA heat range.

Ford Racing has cold plugs for your engine, but they are copper, not platinum.

 

I suspect it's not gonna be worth continuing this discussion with you, as I sense you've already got yer back up because someone actually *gasp* disagreed with you. So - how receptive are you going to be to information that challenges what you think you know? My guess? Not very, if at all.

But - I'm stubborn, so i'll kick this particular can just once. Ya never know ..... So - here goes:

Fact is, Factory maint schedules are based on TCO - and are stacked in their benefit, NOT yours.

Show me the Factory main schedule for your Factory boosted truck - post a link, a pdf, whatever.

What you can get away with for quite some time on a normally aspirated vehicle can kill a boosted one in short order, or at least be very problematic at best, and incur suboptimal performance.

A couple obvious differences:

- Frequent oil changes - to combat fuel dilution from boost. ~3K-5K is reasonable - oil analysis is very prudent thing to do, too.

- Frequent fuel filter changes - to ensure purity anduninterrupted fuel supply from a possible clogged injector, or loss of fuel pressure - every 10K or less - ASAP if you even think you got a tank of bad fuel

- Frequent plug changes to ensure lowest possible firing energy to reliably ignite the mixture - gap growth, nice unworn sharp edges, fouling, etc, Every 30K is reasonable. For a 1-piece plug, it's cake and the plugs are cheap.

- Frequent front O2 changes - absolutely crucial to accurate A/F control. 30-50K is reasonable - they are NOT that expensive. Motorcraft preferred as they appear to light off and respond better than other brands. http://vmptuning.com/forum/showthread.php?t=825

- frequent cooling system maint to ensure consistent temp control - higher temps lead to detonation and pulled spark timing

- etc, etc. In summary - running boost, yer truck needs far more TLC. Unless you simply do not give a flying phook about it.

Heck - even something as basic as rear diff oil in any Ford LS is misrepresented - it needs to be changes every 30k/3 years if you want to minimize corrosion due to the FM wickin' moisture into the lube.

I will Never abuse my vehicles by following the ridiculous factory schedules - they are largely hogwash. 'Lifetime' my ayss...

Yer truck - yer money. You've a lot to learn. I'm done.

MGD

 

NO plug will go 100k in a boosted application.. it you even try say good bye to your pistons..

 

I have NGK plugs in my 2008 Procharger f150 with brown COPS. One stage cooler gapped at 35 I think. NAPA has all the specs or google NgK website. They seem great so far.

 

I ended up ordering the ford racing zero degree plugs that are 2 heat ranges colder. From what I've searched I believe they are made by NGK. I've seen some site saying they were iridium and some saying they were copper so I guess I'll let you all know what exactly they are and how they perform once I put them in

 

The M-12405-3V0 is for the old style heads, and are 2 piece.

The new heads take M124053V12MM.

 

My Ford Racing Zero Degree plugs came in today, part number M-12405-3V12MM . To clarify some things for future questions about these plugs and re-affirming what I have read while searching on the Google machine:
They are made by NGK, they are Iridium IXs, not copper.
One piece design for the revised heads. (12mm, not the high thread design of older 5.4 motors.)
The part number for them is ZNAR7AIX, stock number 7554.

Hope this can help out future user as it was kind of a pain in the *** researching them due to lots of false information on them and finding some sites supporting this information and others saying completely different things. I suspect a reason for the conflicting info is maybe due to the old vs new head designs.