C5natie

iTrader: (1)

Been trying find the best plug for my cam only LS3. It has a moddified z06 intake, lt headers and a tsp 231/236 cam. 470rwhp/460ftlbs. I was thinking NGK tr6's gapped at .0035?

Mez

iTrader: (1)

You realize TR6 are not Iridium so you will have to change them out frequently. You should look at either the AC Delco or Autolite Iriridium plugs spec for the LS7. iridium plugs cost more but the last a lot longer.

litle88

iTrader: (20)

What heads are you using with a modified Z06 intake?

If your compression is the same you can just replace your stock plugs if the miles are still low enough, if they aren't just replace them.

C5natie

iTrader: (1)

Hey guys, its a c6z cold air intake, LS3 intake manifold. Stock LS3 heads, stock comprsssion.

For performance I only ever use copper plugs. There is no better conductor then coppper in plugs tho they may not last as long.

Mez

iTrader: (1)

Yes, copper is a great conductor but does it really make a better spark plug? I mean, the coils make 40,000 volts which then goes though a spark wire that is not copper before it reaches the plug. I believe the resistance is more critical then conductivity because the amperage is low so the actual current flow is low. If the current flow was high, then copper becomes more important.

C5natie

iTrader: (1)

I can tell you that the definition of a better electrical conductor is its resistance, or lack thereof, to electrical current. Until they make gold spark plugs, copper will be the best choice. Its is softer tho and therefor doesnt last as long as iridium or platinum plugs.

litle88

iTrader: (20)

Tr6's might just be one step colder for your stock compression. Iirc

But the iridiums are better IMHO. I switched from the tr6's to iridiums in my application.

But since you already know the answer then why are you asking?

99Bluz28

iTrader: (35)

If you still at stock compression then a NGK regular TR5, or a Iridium TR5IX.

C5natie

iTrader: (1)

Im asking because there different copper plugs and heat ranges. I know copper are the better choice purely based on performance. What copper plug and heat range is what Im wondering.

C5natie

iTrader: (1)

I might check out the ngk iridiums but I wont fork out $13 a plug for iridium ac delcos for no performance gain.

Mista Blazer

iTrader: (4)

at 100,000 miles to plug changes, i prefer it.

if you could show me a HP/Time gain from copper - iridium ill accept defeat. I know copper conducts better but doesnt all spark plugs conduct since they are all made to ignite the fuel??

mrvedit

Actually Silver has the lowest resistance of any metal, then copper, then gold, then aluminum.
However like C5natie, I am more interested in people's experience with different heat ranges.

C5natie

iTrader: (1)

Im not saying a hp gain. Im saying $2 vs $13 for the same performance. It takes me 15min to change all my plugs and I would never leave any plug in my car for 100k mi regardless what its made of. So, changing copper plugs every 50k mi doesnt bother me. And a better conductor will give you the best possible spark.

C5natie

iTrader: (1)

Just do a google search guys. Copper is the best performing plug because its the best conducting metal of all spark plugs available. Iridium and platinum plugs also retain more heat. Platinum is also more brittle and usual the gap is not adjustable. The ONLY plus side for iridium is longevity. For optimum spark, especially high compression, nitrous and fuel injected motors, copper is the way to go. The main thing is to find the correct gap and heat range.

http://www.carsdirect.com/car-repair...op-performance

LSxPwrDZ

iTrader: (4)

Or you could go between the classes and use a NGK G-power plug.

NGK 7092 - G-power Gasket Seat #6
NGK 5141 - G-power Taper Seat #6

They run around $1 more than a standard V-power NGK but will last longer.

Don't listen to people trying to get you to put stock heat range plugs back in the car. What most don't realize is they put a #5 plug in there to aid in passing emissions. The colder plug, #6 or #7 projected tip, will resist detonation or spark knock much more. Do realize that a little JDM B18C ITR engine that is 11:1 compression from the factory in Japan came with NGK #7 plugs from the factory! Just a little food for thought. Once I buy a car unless it is 9:1 and NA I'd never run a #5 plug.

C5natie

iTrader: (1)

^^
Thnx LSx, ill look those up. Thats one thing I was worried about with the stock plugs, that they might be too hot for when Im at a hpde beating on the car seeing higher temps and higher sustained revs. Stock pistons aint the strongest and I wanna avoid any detonation.

Mista Blazer

iTrader: (4)

I was not aware you were running a bottle, stock compression you should be fine on the plugs but if it doesnt take you long to swap the plugs then its all up to you brotha, i understand copper is best for conduction, hence why we still use it in everyday electrical lol i dont run my LS hard so i dont mind the 13 a plug for NGK Iridiums that last me a few years. the car never sees over 135 so i understand where your coming from tho. now as far as a bottle i really dont know what they do to the plugs. but i swear by NGK and AC Delco.

good luck mate! might just have to fart around with some plugs for a while

C5natie

iTrader: (1)

Thnx.
I meant most guys with nitrous motors run copper plugs. Im not on the bottle, yet. I know when I do run some laughing gas I'll need an even colder plug. Compression might be stock but with more power you get more heat. I run my car hard and do road course events so I gotta put that into consideration.

99Bluz28

iTrader: (35)

Well, if you want a cooler plug the NGK TR6, or TR6IX

Gunslinger09

I would say NGK plugs, but TR55s.