Like stated in the title, I'm having trouble finding a part number for a copper plug I can use in the 957 Cayenne TT. Does anyone know of a v-power plug that can be used in the 4.8? Thanks for the help!

 

Sourced one. LFR7A for a copper NGK plug. LFR7AIX for an iridium version. 7 is one step colder than stock. R7437-8 is an iridium racing plug that is 2 steps colder. R7437-9 Is 3 steps colder. Hope this helps anyone whos hunting for a colder copper or iridium plug from NGK

 

Copper requires more frequent replacement. Iridium or even plain Silver is the best...

 

Copper is the most conductive and the most resistant to spark blow out. I dont mind more frequent changes as I just do it with my oil change. Saying iridium or platinum is best really only relates to what your usage is. Plus they're dirt cheap!

 

Smart man, and correct.

 

The dirt cheap I'll agree with. Superior - not so much. Conductivity at 40KV over a metal path that short isn't a big issue, The spark has to go through the gap - the energy has nowhere else to go. And how is it most resistant to spark blow out?

Cheap I'll give you. The other stuff - please point to the data supporting those claims. I'd like to learn..

BTW - question - why are you looking for a colder range plug? Are you seeing signs of detonation? Plug meltdown?

 

My car is sitting about 100hp over stock so i wanted to go a heat range colder. Plus I drive it pretty hard. And I stand corrected about the plug after doing more research. It's always nice to have intelligent conversations! I ended up going with an NGK iridium plug with a gap of .029"

 

Well the iridium aren't going to make any more power they will just make the same power longer.