1LE SS

Quick question regarding spark plugs.
I recently did a cam/headers/hi flow/tune upgrade. Got decent numbers (485 RWHP, 446 Tq) and car feels great.
A couple weeks after the dyno tune (stock plugs), I had several people ask if I went with a cooler plug with the explanation that it might be happier. So I went out and bought some NGK Iridium Plugs TR6IX and installed them.
This is going to sound stupid but I kinda feel like its not as good as the stock ones. Not sure if I'm just getting used to the increased power from the upgrades or its not enjoying the new ones.
Is it possible that I went backwards by using these ??

I know, just put the stock ones back in !! Before I do that I was just wondering if anyone has had the same experience.

Thanks

HCI2000SS

iTrader: (2)

Nope. The TR6 is a solid choice

1LE SS

OK thanks, I guess I'll leave them in there for now.

1LE SS

So I've gone back and forth a couple times now between the stock and cooler plugs.
My "unscientific" results are that it definitely pulls harder in the 3-6000 rpm range with the stock plugs but has a slightly crisper throttle response below 3000 rpms and a better idle with the cooler TR6IX.
Does this make any sense or am I going a little bit crazier ??

2xLS1

iTrader: (25)

Here is some good reading for anyone that thinks they understand what having the correct heat range plug is effecting.

https://www.ngksparkplugs.com/about-...rk-plug-basics

Fullpower

If your compression ratio is unchanged from stock, and if you are NOT using nitrous or manifold pressure then stock HEAT range plugs should be about right.