spark plugs

red99pony · 07-27-2011, 09:51 PM

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

DolSVT00 · 07-27-2011, 10:11 PM

tr6 .035

03SVTCOBRA · 07-27-2011, 10:20 PM

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.

slowgreen99 · 07-27-2011, 10:29 PM

gap em at .025, and shoot that thing.

DolSVT00 · 07-28-2011, 10:06 AM

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.

Carlrx7 · 07-28-2011, 12:16 PM

Quote:

Originally Posted by DolSVT00

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

red99pony · 07-28-2011, 04:51 PM

Quote:

Originally Posted by DolSVT00

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.

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

jc

07-27-2011, 09:51 PM	#1
red99pony Senior Member Join Date: Jul 2009 Location: goose creek sc Posts: 818	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 __________________ 02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost

07-27-2011, 10:11 PM	#2
DolSVT00 Moderator Join Date: Jan 2007 Location: Goose Creek Posts: 3,913	tr6 .035 __________________

07-27-2011, 10:29 PM	#4
slowgreen99 Senior Member Join Date: Jan 2008 Location: Summerville Posts: 7,740	gap em at .025, and shoot that thing. __________________ M.R.E. Bad Bob Motorsports

07-28-2011, 10:06 AM	#5
DolSVT00 Moderator Join Date: Jan 2007 Location: Goose Creek Posts: 3,913	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. __________________

07-27-2011, 10:20 PM	#3
03SVTCOBRA Senior Member Join Date: Jul 2011 Posts: 2,041	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.