outlaw38

I keep reading about gapping the plugs different for a supercharger setup. What plugs should I run and at what gap ? Truck is a 11 5.3 with a mangnusen s/c. It has 7500 miles on it. Thanks

02'Z71ONDUBZ'

iTrader: (8)

NGK TR6 is a popular boost plug, gap it anywhere from .030 to .035. Mine are at .035

AKlowriderZ71

iTrader: (22)

Which Magnuson do you have, and what boost levels are you at?

1SlowHoe

iTrader: (28)

This for up to 10psi. More boost requires a slightly colder plug. A NGK BR7E or something like that. I don't have the box handy

outlaw38

I don't know. I bought a complete bolt on kit. The truck has a stock engine so I would say around 8 psi.

AKlowriderZ71

iTrader: (22)

Post up a pic of your supercharger, I'm gonna guess that it's a MP112. Stock engine with 8 psi, I'd say a TR6 gapped at .035" should work just fine for you.

TIM Z

iTrader: (12)

Hmmm. Discuss please, I run 12+ psi with Tr6's @ .035.

1SlowHoe

iTrader: (28)

I'm sure that's fine. I read some giant thread on Tech before I bought plugs for my build. The guys running around 15psi+ were saying it was safer to run the BR7E plug vs the TR6. I was being conservative and saying over 10psi you might look into something besides the TR6.
Spark plug & gap for fi ???? - LS1TECH
what the best spark plug ? 18 psi - LS1TECH

The answers are all over the map in most cases. I just went conservative and bought the BR7E. I don't think you give up much (if any) power it's just safer. I think I gapped mine at .030. I'll confirm all this info once I get it on the dyno in Dec/Jan

TIM Z

iTrader: (12)

Thanks for the info bud!

Thats why im here to learn

terravast4

iTrader: (25)

I switched to the tr7 also and I am at 11 psi...idle smoothed out a little and i do not feel I lost anything by doing this swap.