Copper vs iridium plugs for modified car?

[TurboTapin]

On 10/14/2024 at 7:17 AM, luke gtr said:

Pro tip:

If your car doesn't run, you don't need to change the spark plugs.

I'm at 8 years and counting.

That's generally how I handle it. I was surprised in NGK's response though. They stated on the low end, people replace them every pass and on the higher end, once a season. I'm confident I can keep them much longer than that as it's not a dedicated race car. 

[luke gtr]

On 17/10/2024 at 12:39 AM, TurboTapin said:

That's generally how I handle it. I was surprised in NGK's response though. They stated on the low end, people replace them every pass and on the higher end, once a season. I'm confident I can keep them much longer than that as it's not a dedicated race car. 

I understand why.

They're fairly cheap in race part terms.

And you don't want ignition breakdown.

But, fire occasional track days, just pull them and inspect every service.  Clean, adjust and replace when worn/required. 

[burn4005]

yep just a JIC vs ISO insulator height.

old coils are for JIC, new coils are for ISO