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

 

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

 

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

 

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

 

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

 

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.

 

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

 

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.
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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

 

Thanks for the info bud!

Thats why im here to learn

 

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.