Spark plugs and Boost 101

[CHEVROLADE]

Lets talk ,What sparks are u running /engine size and Boost?

I'm currently running Ngk TR5 on 6.0/12-14#

But was told they are still too hot, like stock heat range? Confused there I know there's a boost /Ngk chart somewhere but not gonna bother to find it, plus real world experience is better.

I ordered a set of TR7 so going to try them out.

[03regcab sierra]

NGK br7ef gapped at .032" 4.8 will see a ton if boost might have to gap the plugs tighter but I'll first see how much boost till spark blows out

[phantom405]

Lets talk ,What sparks are u running /engine size and Boost?

I'm currently running Ngk TR5 on 6.0/12-14#

But was told they are still too hot, like stock heat range? Confused there I know there's a boost /Ngk chart somewhere but not gonna bother to find it, plus real world experience is better.

I ordered a set of TR7 so going to try them out.

That plug is HOT!

I run a br8ef (NGK1049) or even a -9. Definitely get a non-projected tip plug in there. Atleast a -7(br7ef). That's still a fairly hot plug though.

[TurboMic]

ya, u need to step back a bit. at a minimum go to a tr6, but a 7 heat range would be safer. you want to go with the coldest plug possible, that still runs well. if plug is too cold it will not idle or run low speeds well. I run mine colder than I should, but its a safety thing.

[phantom405]

ya, u need to step back a bit. at a minimum go to a tr6, but a 7 heat range would be safer. you want to go with the coldest plug possible, that still runs well. if plug is too cold it will not idle or run low speeds well. I run mine colder than I should, but its a safety thing.

Agreed.

BUT, the beauty of fuel injection is you can tune for the crappy idling of the colder plugs.

[TURBO10]

I run 7's in my Wifes car Boost only 10psi.. Butt in my SS I run 5820 -10's Due to the fact that im spraying 2 kits and 10 psi . I also close the gap to 25.. Better safe than sorry..This is food for thought for you guy's spooling with Nitrous...

[George C]

Br7ef is were you wanna be at for your current power level

[farmtruc]

I still run tr6 plugs at .026".
Never any detonation. Never a burned tip. Etc.
22psi plus.

All I'm saying is. Do what ur engine wants.

[CHEVROLADE]

Thanks peeps... I went ahead and swapped in the 3346 ngks... The old ones looked ok.

[George C]

I still run tr6 plugs at .026".
Never any detonation. Never a burned tip. Etc.
22psi plus.

All I'm saying is. Do what ur engine wants.

thats very interesting about you running that hot of a plug. you happen to have any pics of your plugs with the threads cut off