Hi, I am going to be getting a supercharger soon, either a powerdyne or procharger and I would like to know which spark plug is the best to use with a supercharged 5.4? Thanks.

 

You will doubtless get many replies on this one, but I am switching to Denso Iridium it20 for my Powerdyne / 4.6 set up. This is one step cooler - I was running 1t16 n/a. These plugs have an incredibly small and fragile center electrode, and Denso would prefer that they be used straight out of the box and not be gapped....not cheap either.
The critical number involved here is the gap. Everyone here seems to agree on .035, however, I recently read one place that .030 was the magic number.
I had to have confirmation on that as the sticker under the hood says .054, and it seemed like it would be way too close, but boost will blow out the spark if the gap is too wide.
Keep reading posts and use the search function, there is a lot of info here.
LOL

 

I thought you are susposed to use a copper plug? I've done some research and it seems a lot of people use the ngk TR-6? Is this a good plug to use?

 

You get what you pay for. NGK is good but cheap and must be changed more often. I bit the bullet and put denso. They are $$ but last much longer.

 

Thanks for the chart, just what I was looking for.

 

i'm running the bosche 4's and haven't had any problems so far. been on there 8000 miles

 

I'm using the TR6s on my 10 psi Vortech setup.
-Rob

 

I also had to go to TR6’s, just put them in yesterday and had to back the gap back to .028.

I don’t know why mine is different but I suspect the Compression Ratio is higher then a stock engine. I am going to do some cylinder pressure readings to see if they are higher then stock. I am running a 10 lb pulley.
I have been constantly nagged by a WOT miss. The better I got the supercharger to run the more it seemed to miss at WOT.
NGK TR6 gapped at 028 fixed it and my idle is still good.
I would try the TR5’s first or the Iridium’s. I don’t think too many have the problem I did.

 

I just installed the it20's at .035 yesterday along with injectors, and new tune.
They seem very good so far, but I probably have 1/2 of the boost WLF has. LOL

 

ONELOWF,
From that I gather you got everything from Mike and it's installed. I am curious how you like your new found power.
Post your impressions here somewhere.
My truck is flying and I have only been hitting 9 lbs or so. I can now free up my mind to work on that spring loaded tensioner...

 

A lower cost alternative to the Denso is the NGK Iridium plugs TR5ix, TR6ix, TR7ix, TR8ix.

 

i noticed a lot of ppl use the denso plugs for their sooper charged applications. has anyone here used the Brisk plugs like the ones Mark offers from LFP?