spark plugs
 

i am looking to change the plugs in my roots supercharged 2v 4.6. i run about 14# of boost. what plugs/gap are you lightning and cobra guys running? i am thinking of using ngk tr6 but not sure.

thanks

tr6 .035

ide run them alittle smaller than .035, tr6 at about .032 worked really well on mine at that boost level. Try .035 and see if you get spark blowout, can always go smaller or bigger to find what works with your setup.

gap em at .025, and shoot that thing.

Just remember, the TR6's will burp a lil at idle because their a cold plug. 14 psi is really not enough to justify going any smaller on a 2v unless you shoot it or get spark blow (that happens when you shoot it with boost too) you want to have the gap as wide as possible but tight enough not to get spark blow. The larger the gap, the better it will run at idle and low rpm's.

good info!
my car ran tr5ix stock @ 400hwp
then tr6's gapped @ .030 up to 600whp
now im running BR7EF @ .030 over 7xx whp

my idle definitely has a slight miss, but not bad enough to trigger any CEL.

-Carl

thanks for the info, my cams will prevent a smooth idle so i doubt i will notice any burping. i may shoot it later but before i did that i would run more boost so i think these plugs and gap will hold me for a while. i appreciate everyones input :bigthumb:

jc