Which spark plugs?
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Senior Member
Joined: Sep 2011
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Which spark plugs?
1998 4.6L with powerdyne supercharger 6 lbs boost.
Which plugs? I so alot of NGK TR6 but there are V, G, XI. Which one?
V-Power: BETTER, improved ignitability, fuel economy and emissions
G-Power: BETTER, improved ignitability, fuel economy and emissions, platinum alloy for durability
Iridium IX: BEST, superior ignitability, fuel economy and emissions
Which plugs? I so alot of NGK TR6 but there are V, G, XI. Which one?
V-Power: BETTER, improved ignitability, fuel economy and emissions
G-Power: BETTER, improved ignitability, fuel economy and emissions, platinum alloy for durability
Iridium IX: BEST, superior ignitability, fuel economy and emissions
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
I can't tell you what plug 'heat range' but you need to take a close look at what you have now for heat range vs your application and driving style.
....Look a the ground strap for signs of extreme heat. White color, signs of metal beading etc.
....If you see any of these signs the heat range is to hot for your application.
....Don't be concerned about fuel mileage as related to spark plug design/type because the blower "rules" the application.
....Being a centrifigal type blower, the boost comes in at somewhat higher RPM where the fuel curve needs to richen up quickly as opposed to a positive displacememnt type that comes into boost at much lower rpm where fuel needs to richen earlier.
....I would assume you are running the motor on a different PCM tune to accomodate the fuel supply, ignition timing curve and larger fuel injectors. I would also hope you have had the benifit of a dyno test and tune to get a proper PCM tune.
....With these changes, you have to settle on the plug by observation and test.
....No one can accurately reccomend a specific plug because of this.
Good luck.
....Look a the ground strap for signs of extreme heat. White color, signs of metal beading etc.
....If you see any of these signs the heat range is to hot for your application.
....Don't be concerned about fuel mileage as related to spark plug design/type because the blower "rules" the application.
....Being a centrifigal type blower, the boost comes in at somewhat higher RPM where the fuel curve needs to richen up quickly as opposed to a positive displacememnt type that comes into boost at much lower rpm where fuel needs to richen earlier.
....I would assume you are running the motor on a different PCM tune to accomodate the fuel supply, ignition timing curve and larger fuel injectors. I would also hope you have had the benifit of a dyno test and tune to get a proper PCM tune.
....With these changes, you have to settle on the plug by observation and test.
....No one can accurately reccomend a specific plug because of this.
Good luck.
