Irridium plugs IT20
Irridium plugs IT20 I put in some Denso IT20 irridium's and went to the track last night. Went 12.6 N/A and 11.8's on the bottle (80-shot). Has anyone else had any experience with these? I was hoping for a little more noticeable difference - MAYBE a half-tenth with the new plugs, hard to say, last raced it about a month ago on TR6's - but I will say it seems to rev up smoother. The old plugs were gapped at .035, and I left the Denso's stock (0.042" or so) and didn't have any problem with misfires or anything. In fact, usually after 6 or 7 runs the car just won't go any faster, even if the bottle's pressured up, but last night my best run of the night was actually the last one. But like I said, it wasn't a night-and-day difference, just seemed to run better on the new plugs.
Launching!
Joined: Jan 2003
Posts: 269
Likes: 0
From: Northeast Baby!
Personally you probably get better results with cheapo NGK's and doing this age old trick
http://performanceunlimited.com/docu...degapping.html
Works great but the plugs don't last as long since you are now concentrating the spark on one side of the electrode.
http://performanceunlimited.com/docu...degapping.html
Works great but the plugs don't last as long since you are now concentrating the spark on one side of the electrode.
The plugs don't make a huge difference, but SOTP feel is there and it revs smoother. Quicker et? Barely, if at all. They seem to like the gas, though. Let's see, last visit to the track I went 12.55 n/a and 11.92 on the juice. Friday, with the new plugs, I went 12.6 n/a and 11.86 on the juice. I know the weather was different, and these plugs were fresh, the tr6's had 7K miles on them, but they do seem to work better. Whether they're worth the $ I'm not sure. I still have to pull one of them out to check if I blew that little electrode off. I know on the stock platinums, that little button on the ground strap didn't last long. Hopefully, these are made a little better.
You DONT want to use iridium plugs on the juice. Iridium plugs are HOT plugs and you want to run cold on the juice.
I would recommend if you want to keep your motor you go back to the TR6's
I would recommend if you want to keep your motor you go back to the TR6's
Iridiums are just fine on nitrous if you get the appropriate heat range. I don't understand how people are confusing iridiums with stock style platinums.
Last edited by Nic00Z28M6; Feb 14, 2005 at 05:09 PM.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo Yeah, irridiums come in heat ranges, just like the NGK's do. I got one step colder than stock. 
Why wouldn't that be OK with nitrous? I wasn't showing any KR more than I was NA, either, according to my scan tool. And the irridium alloy they use for the tip is like 5 times stronger than platinum and melts at alot higher temperature, alot more resistant to oxidation, that allows them to make the tip so thin. A thin electrode = more concentrated spark = requires less voltage = ignites in a leaner environment than a standard plug would, so you should be able to run a wider gap and still light the mix. Or at least that's what I read in Denso's SAE paper. Nothing to do with heat. I always thought the heat range had to do with the size of the center post insulator, which would determine how fast the heat would travel from the center to the cylinder head. A longer insulator would retain the heat more, I thought, and might even glow red with a power adder like nitrous, providing enough latent heat to ignite the next air/fuel charge before the plug even fired (preignition).
Why wouldn't that be OK with nitrous? I wasn't showing any KR more than I was NA, either, according to my scan tool. And the irridium alloy they use for the tip is like 5 times stronger than platinum and melts at alot higher temperature, alot more resistant to oxidation, that allows them to make the tip so thin. A thin electrode = more concentrated spark = requires less voltage = ignites in a leaner environment than a standard plug would, so you should be able to run a wider gap and still light the mix. Or at least that's what I read in Denso's SAE paper. Nothing to do with heat. I always thought the heat range had to do with the size of the center post insulator, which would determine how fast the heat would travel from the center to the cylinder head. A longer insulator would retain the heat more, I thought, and might even glow red with a power adder like nitrous, providing enough latent heat to ignite the next air/fuel charge before the plug even fired (preignition). 
TECH Apprentice
Joined: May 2002
Posts: 338
Likes: 0
From: one step ahead of you
according to most people i have been talking to. if you go to a tr6ix or a tr7ix you will be fine. as the iridium is quite harder than the platinum. what i have also been told is that the tr55's will tend to quit firing and or burn out sooner with fuel problems. the iridiums will not. they will continue to fire. this bit of info backs that up.
http://www.spark-plugs.co.uk/pages/t...park-plugs.htm
http://www.spark-plugs.co.uk/pages/t...park-plugs.htm
