boosting and sparkplugs?

[bias]

At what point should you go colder with sparkplugs? is 14psi considered moderate boost? I'm running iridium 6 now @ 14psi. I just installed wideband and it looks like I'm leaning out at full throttle. I have 450cc injectors but running a tune for 460cc could that cause me to lean out or could it be the plugs? Eprom is for z32maf and fuel pump, s14 t28bb, front mount, and intake.

[themadscientist]

leaning out is a lack of fuel. Your spark plugs have nothing to do with it. They can be a source of detonation and or preigniton if they are too hot but that is not contributory to your mix. It is contributory to something like this.

That's my old piston from my bike.

[bias]

Thats crazy! Ok what are symptoms of preignition and detination? What does it feel like? When I hit max boost the car seems to cut out? Fuel cut should be removed on my eprom so I'm lost. Could the coil packs be too weak?