Tr6 is fine for low power with low compression...hell while trouble shooting i ran tr6 in my 427 for 7 psi and low rpms just cause parts srores dont stock br7s

.028 should be used for around 18psi (give or take)
.024 for above that

But each setup is different...example 7 psi my 427 is rwhp range of 900 at 7500

Just keep eye on logs...if map reading looks like a sae blade you have blow out

 

i guess what do you consider low power? im doing an lsa swap on my 08 silverado and im looking to make about 12-14 lbs of boost. Im not sure what that would relate to hp wise. but i would told to run a br7 plug in one instance and told a br6 would work in another. which way do you guys think i should go?

 

With a heat pump for a power adder id use br7ef

 

thanks

 

Hey George, what plug wire do you use?

 

I have wires for a lt1 on my truck since my coils are relocated

 

George any thoughts on 12-15psi E85 setups possibly liking a 6 heat range plug more than a 7 compared to pump gas/meth setups? I'm sure everyone is sick of the "what plug" questions but I was just curious if hotter plugs and e85 are related.

 

Probably wont like it honestly unless compression was so low

A psi number doesnt always mean the same as next guy..15psi from my twins is 1300 rwhp range
15 psi from a on3 70 is 600 range

Tr6 at 15 probably wont take much timing without putting heat mark to far down strap but only 1 way to find out