SP542 Thread

[xrocket21]

I see this thread came back after 2 months of no activity. Did any of the early skeptics finally install them? If so, please provide your thoughts.

I am getting ready to do an MPT 93 PRX with FR IC and 170 t-stat install on my 2018. I ordered the SP-542s based on this thread, even though I have had zero issues with my factory setup after 2K miles.

I put them in and so no change in fuel economy, no change in idle, no change in power, the visceral driving experience is not significantly enhanced. There is not a tighter connection between me, the truck, and the highway.

 

[rtmozingo]

I put them in and so no change in fuel economy, no change in idle, no change in power, the visceral driving experience is not significantly enhanced. There is not a tighter connection between me, the truck, and the highway.

Hmm, starting to wonder if it was just bad gapping (or just plugs) from factory then. Not sure I want to bother replacing mine. Some have done back-to-back testing of new 550s vs 542s and noted a difference, but I think most (if not all) are running tunes.

 

[TXRaptor]

I put them in and so no change in fuel economy, no change in idle, no change in power, the visceral driving experience is not significantly enhanced. There is not a tighter connection between me, the truck, and the highway.

This is the type of feedback I was looking for... You hit all of the previous "positive" comments in one quick reply.

Are you running a tune? If so, which one?

Your comments make me wonder why others have experienced much more positive results. Since I already ordered mine, I am going to install them at the same time I have the rest of the work done, as I have not heard any reason not to use them. (i.e. With all of the changes I am doing, I will not be able to judge the difference...)

 

[xrocket21]

My stock plugs care out at 22k miles, nice coffee brown, gaps were like 35

new plugs are 32 pretty cosistently, I gapped all to 25.

I run the 5 Star 93 Performance tune.

 

[mad man]

Now the dealership has more ammunition to DENY a warranty issue.

 

[Gsteve]

Now the dealership has more ammunition to DENY a warranty issue.

Is it painful being that stupid?

 

[COMBS19]

I put a set in mine at 5,500 miles and have around 6,500 miles. The biggest thing I notice is it got ride of the stubble I would get every so often. It might of helped on the low end power but hard to tell. Also I have the MPT 91 PRX tune. They came gapped at 28 and left them like that.

 

[mad man]

:

Is it painful being that stupid?[/QUOTE
Not only are you changing the heat range of your plugs, plus changing your ECM , and for some their TCM modes
Your sync 3 communicates to ford quite often . I’ve decided to stay stock and train my ECM & TCM by my driving style . It works, it just takes longer. I will drive the hell out of it for 6 years or 100,000 miles with a bumper to bumper warranty . Each to their own

 

[xrocket21]

:

Is it painful being that stupid?[/QUOTE
Not only are you changing the heat range of your plugs, plus changing your ECM , and for some their TCM modes
Your sync 3 communicates to ford quite often . I’ve decided to stay stock and train my ECM & TCM by my driving style . It works, it just takes longer. I will drive the hell out of it for 6 years or 100,000 miles with a bumper to bumper warranty . Each to their own

you seem smug as ****

 

[Gsteve]

:

Is it painful being that stupid?[/QUOTE
Not only are you changing the heat range of your plugs, plus changing your ECM , and for some their TCM modes
Your sync 3 communicates to ford quite often . I’ve decided to stay stock and train my ECM & TCM by my driving style . It works, it just takes longer. I will drive the hell out of it for 6 years or 100,000 miles with a bumper to bumper warranty . Each to their own

wow.....