LS1M

iTrader: (3)

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.

AgentOrange

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.

half-n-half

iTrader: (7)

wow does that actually work just like they say on the site?
seems like a solid idea, but is it real?

Thanks
Louie

LS1M

iTrader: (3)

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.

93LS1RX7

iTrader: (8)

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

NicD

iTrader: (7)

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.

93LS1RX7

iTrader: (8)

When I tried to buy iridiums I asked for the same heat range as the TR6 and they said they dont make them that cold. I am by no means a plug expert.

NicD

iTrader: (7)

They have both 6 and 7 versions of the iridiums.

NGK TR6IX plugs - 3689
NGK TR7IX plugs - 3690

LS1M

iTrader: (3)

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).

Mach1killerls1

iTrader: (3)

but aren't tr55's good on juice i have them and was told they would be fine for anything 100 or under?????

Y2K2LS1

http://www.ngk.com/results_cross.asp?pid=tr6ix&x=0&y=0

93LS1RX7

iTrader: (8)

If they have heat ranges then you would be fine I guess

Kakarot2569

I would really see no problem with Iridiums as long as their heat range was in the right range.

one92rs

iTrader: (1)

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