Heat range on ngk plugs?

[69ls1]

Is it recommended or sugguested to drop from the stock NGK CR9E to a CR8E plug when running 6-10 pounds of boost? What would be the best heat range to run?

 

[jjmetheny]

Run the stock plugs.

 

[kawiboy11]

I just run the dual plug, but I here stock works just as good!

 

[smitherscustoms]

Is it recommended or sugguested to drop from the stock NGK CR9E to a CR8E plug when running 6-10 pounds of boost? What would be the best heat range to run?

For starters,NGK plugs heat range numbering is backwards compared to other plug brands.Example:CR8E is 1 heat range HOTTER than a CR9E.We have produced big HP#'s with NGK CR9E standard hayabusa plugs Gapped at .018-.022 for turbo application.Genrally,you want to run a Colder plug in hi compression situations/Nos/or turbo,But the stock plug is fine for 6-10lbs boost.

 

[frisbee]

I'm pretty sure I put 10s in mine , one step cooler for NOS.