NGK TR-6 Plugs

[Dragcity]

For N/A Marauders, what are we gapping the NGK-TR-6 Plugs to?

I searched, and the question remains...

Am I to suspect 52 to 56 ?????

[RF Overlord]

Yes.

The only time you want to change the gap is with forced induction.

Not sure if this also applies to nitrous.

[mtenderenda]

Look it up in the owners manual. It's in there.

[Black Dynamite]

Its also on the sticker on the bottom side of the hood.

[Pat]

Hold on a minute,

The NGK TR-6 are iridium plugs and are pre-gapped. It's really IR-6, somewhere along the line people changed it to "T".

Correct me If I'm wrong, but I just bought a set.

You can tell if they are iridium because the center electrode is very thin. They don't look like a regular plug and the center electrode should not be touched by a tool or the spark will dissipate.

FWIW.

[Krytin]

TR-6's are copper core electrodes.

[Paul]

NGK makes both copper core TR6 and Iridium IR6. TR6 would be gapped same as specs in owner's manual. I've never had the iridium's, so I don't that answer.

[burt ragio]

What plug last longer the copper or iridum ? Which plug offers better performance ?

[RF Overlord]

Correct me If I'm wrong, but I just bought a set.Sorry, Pat, but as Paul said, they make both.


the center electrode should not be touched by a tool or the spark will dissipate.What?! Never heard that before.

Iridium plugs should not be gapped using ordinarly gapping tools only because the iridium portion of the centre electrode is very brittle and can be easily damaged. There are special tools available for this.

[RF Overlord]

What plug last longer the copper or iridum ? Which plug offers better performance ?Iridium plugs will last longer, but the tiny improvement in performance is generally not considered to be worth the increased cost (between $8-$10 each).

[ctrlraven]

I have the NGK TR6IX plugs. The price has jumped a good bit since I bought mine a while ago. In conjunction with the GMcopc I noticed smoother idle, faster revs and little bit better gas mileage.

TR6IX is one stage colder plugs. TR55IX are the equivalent to stock plugs I believe.

[JACook]

I have the NGK TR6IX plugs. The price has jumped a good bit since I bought mine a while ago. In conjunction with the GMcopc I noticed smoother idle, faster revs and little bit better gas mileage.

Unless you started by putting in a fresh set of standard spark plugs as a baseline, your
results are not so much proof that iridiums and GMS COP connectors work better than
factory, as it is proof that new plugs work better than worn out ones...

My MM just clicked over 70K miles this past week. It'll be getting a fresh set of NGK
TR6s soon, and I expect I'll see the same improvements.

[burt ragio]

Why are some of you going one step colder from stock NGK TR55IX to TR6IX plugs ?
If one went one step colder would you have to use a lower temp themostate ?

[ctrlraven]

I don't know if you have to have a lower temp t-stat but I went with one anyways.

[burt ragio]

I don't know if you have to have a lower temp t-stat but I went with one anyways.

But why are some members going with colder plugs ?

[Blackmobile]

But why are some members going with colder plugs ?

It's needed when SCed, and they still work well NAed.

[Paul]

tis my understanding the colder plugs help prevent detonation when you have advanced the timing more for performance.

[fastblackmerc]

Colder plugs & T-Stat = cooler running engine.

Cooler running engine can accept more timing.

More timing = More horsepower.

[gmtech]

no probs here on my TR-6's.. 10k miles on them, pulled them recently and they look new:D

[Blackmobile]

For N/A Marauders, what are we gapping the NGK-TR-6 Plugs to?

I searched, and the question remains...

Am I to suspect 52 to 56 ?????

I see nobody answered the question, so here's a shot for SCed 4.6 engines

NGK TR6 (Copper)- gap .028" -.030" for SC application
&
NGK TR6IX (Iridium) - .030" -.032" for SC application.

They are gapped to .035" from the manufacturer and that's good for NA applications.

[SID210SA]

ok...so should you install the 180 Tstat with the TR6 plugs...and what is our oem Tstat run?

[Zack]

Oh lord.
.035" gap is what you run with a blower and 10psi.

NA gap is .052" or something real close to that.

[Zack]

As for the thermostat, Ive run all different temps over the years and here is what I concluded:
The engine runs best between 188 and 195 degrees.
If you want to dial in a specific operating temp, your cooling fan 'on temp' needs to be adjusted in the tune.

[Blackmobile]

Oh lord.
.035" gap is what you run with a blower and 10psi.

NA gap is .052" or something real close to that.

I bumped mine down to .032 which is relative to .035 for SC

But I can't see opening the gap from .035 to .052 just for NA applications.


As for the thermostat, Ive run all different temps over the years and here is what I concluded:
The engine runs best between 188 and 195 degrees.
If you want to dial in a specific operating temp, your cooling fan 'on temp' needs to be adjusted in the tune.

This is totally correct, and I've only seen Hypertech do this to perfection on a LS1 setup, with the retuning the cooling fans and all.

[ctrlraven]

Oh lord.
.035" gap is what you run with a blower and 10psi.

NA gap is .052" or something real close to that.

Maybe that is the little secret to my setup? lol Being NA and running them. I plan on getting the TR55IX (stock NA gap) ones and see if there is any difference with normal driving and at the track.


As for the thermostat, Ive run all different temps over the years and here is what I concluded:
The engine runs best between 188 and 195 degrees.
If you want to dial in a specific operating temp, your cooling fan 'on temp' needs to be adjusted in the tune.
When my car seems to be running strong the ScanGauge usually reads 188-190 degrees.

[Paul T. Casey]

Your sticker under the hood will say .052 to .056. Sometimes, especially with the colder plug, you can see a small (1 to 2 rwhp) by leaning toward the high end of the gap. In a n/a car. Recheck the numbers. I think the 6 seris is stock, and the 55's are the step colder, but I could be wrong.

[Blackmobile]

Your sticker under the hood will say .052 to .056. Sometimes, especially with the colder plug, you can see a small (1 to 2 rwhp) by leaning toward the high end of the gap. In a n/a car. Recheck the numbers. I think the 6 seris is stock, and the 55's are the step colder, but I could be wrong.

the 55's are the stock plug, and the TR6 is the colder plug!

[Paul T. Casey]

the 55's are the stock plug, and the TR6 is the colder plug!

Thanks, didn't want to open my maintainence file.