Let the changes begin
Once chart is done I will make a pdf and start a email list.

 

Thanks TB!

According to that chart, my 13 lbs on a 4 lb pulley puts me over the edge for TR6's.

 

TR6 plugs seem to work for some and not for others. I know my truck does'nt really like them and I only run 2-3# over stock. Some run as much as 20# of boost with them.

 

Notice where it says 12 at the top... It says +4 beneath it so you are good.

 

I like the chart and it's a useful reference.

I have a few questions.

According to NGK, the TR5/IX is the stock replacement for a n/a 2v 4.6L/5.4L. Why would would it be adviseable to step up to a hotter plug when the TR6/IX is the stock replacement for AGSF-12FM1? This is straight form NGK. The TR55 is the same as a TR5, but the gap setting is much larger from NGK. Excessive gapping would be required in order for it to reach the proper gap clearance, so it should be ruled out.

In reference to Motorcraft- AWSF-22C/32C are both, again called for in n/a 2v 4.6L/5.4L. To replace the stock plug with either is stepping up to a hotter plug.

When I researched Denso, no mention was made to run an IT-16 in a Lightning, but rather n/a 4.6/5.4L.

I'm not trying to negate the chart, but I would like some clarification.

 

Not a problem, I am looking for feedback. The chart is just a collections of info from different Lightning boards. It does need further modifications.

And here's your contribution

 

Another good plug(s) is the NGK TR7ix and TR8ix. They're fairly new.

www.sparkplugs.com is a great reference.

 

I added the p/n for each plug to make it easier for people to find the correct plug at there local parts store. I don't no all the plug part numbers thou. Need help finding the rest and the correct heat range for the NGK TR7IX and TR8IX plugs.

 

So, just to make sure, I am running a 6# lower on a stock Heaton....I should be running the BR7's? Not wanting to challenge, but I have been told that the TR6's would be sufficient.

 

Chart looks great only thing is there are numerous built trucks including me running tr6's with boost towards 20

 

There are plenty of 600+ rwhp trucks running TR6 plugs with no problems. I've had BR7, IT-20, and TR6 plugs installed over the years and the biggest difference in them is the price. I have TR6's in now, with a Whipple turning 16 lbs. max boost on a stock block at 500+ rwhp, with no problems... So far at least.

 

I run Denso IT 22's gapped at .032 w/ 4#er and ported eaton.

 

How about two charts. A manufacturers chart and a user chart. The user chart can include the various plugs people have safely used.

 

That's a good idea. But with all the different mod configurations the chart would be pretty big.

 

The user chart would be user/truck specific. What works for one truck won't work for another, as you can see some trucks don't even like the NGK TR6's but run great on the more expensive Denso plugs.