I am going to be running a direct port 250 shot on my motor. It's 11:1 comp ratio. I will also be using 110 octane fuel. Can I still use the TR6? If not what NGK plug is a step colder than the TR6? What are you big HP nitrous guys running?

 

TR6's are the way to go.

 

Not sure what kind of HP your pushing on motor but a 250 shot is a healthy dose eaither way. You may be approaching the limits of safety with TR6. Some NGK BP7EFS may be in order. PN 3526 <img border="0" alt="[burn out]" title="" src="graemlins/gr_burnout.gif" />

 

I run a 200 shot on 11 to 1 compression and use a NGK part# R5724-8 / stock #7317 racing plug. It does not have a projected tip and is 2 steps colder than a TR6... WOT Timing should be 24 degrees max.