No worries man I am not taking offense I am just genuinely curious because I just haven't seen that before with the newer PCMs.

 

I currently run Tr6 plugs in my lq9 with 8lbs of turbo boost. I am due to change them soon. What is better for my truck?

 

Zeake, at 8psi with an LQ9 you're on the edge of benefiting from a colder plug, but at that point a 6 should still be fine. If you run more than 8psi once in a while, you may want to consider a 7. If you only have 91 octane available instead of 93/94 like some states you may also want to consider a 7.

NicD, thanks for understanding my point. I am a tuner for a living and also have a background in this, but some may just assume I'm attacking their knowledge on the subject rather than just pointing out things I've ran into.

DRx, A 9 is a very cold plug for only 20psi, but certainly should be cold enough. With 20psi and a 427 built like yours you should be well over 1000rwhp if everything is doing it's job correctly. At 20psi you should see enough cylinder pressure to use at least an 8 heat range. The down side to getting into the 8's and 9's is low speed drivability will suffer a touch. I'm curious if you've dyno'd the setup at different boost levels. With the setup you have I'd be interested in seeing where the boost gain to power gain falls.

2ktransam, with your setup a 7 heat range would offer a bit of a saftey factor if the meth kit falls short at any given time.

AKlowrider, yes only ETC equipped vehicles have shown to have problems.

 

Thanks for the info.
Whats the part number for the 7s?

 

....So what range would one shoot for with a 410 and 15lbs of boost with 93 gas and no meth?...

 

https://ls1tech.com/forums/forced-in...ug-18-psi.html

I would pay attention to the fast guys lol.

 

I was told that 9's should be changed after each trip to the track or monthly if daily driven.

 

wanted to bump this to see how these colder plugs run a etc vehicles. i need to replace my tr6's out , plan to turn up the boost a bit. not sure if i should run a 7 or 8 heat range . also considering the tr7ix for longevity 10k miles or so.

427 lsx (trickflows - so i need gasket plugs not tapered thread) 9.1 cr @ 18-20 psi

 

I run BR7EF plugs in my truck, B8EFS in my GTO, and AR494 in my Camaro. In the past two weeks I have tested non-resistor plugs in a 2010 Camaro and an 07 Z06 just to see if we could replicate any of the reported weirdness by running those types of plugs with the newer PCMs and no problems to report.

 

Here is a side by side of the NGK 9 beside the TR6