Is it any time you go FI or is it a power level thing?

 

I would say yes, you do need to go a colder plug at any time you go blower/turbo/nitrous as i have always done. A colder plug removes heat faster than a warmer plug. I don't know about cams cuz i haven't gotten to do that yet. A heat range of 5 is good for a blower install on a street stang. I would assume if someone was only making 250whp they still have stock or equal to stock plugs and only some bolt ons. Maybe if you got to 300whp N/A you would think about the colder plugs cuz you either have cams or some nitrous and bolt ons, 400whp+ you would most likely have some kind of F/I and would need a colder plug. That is just my thoughts by no means am i am expert. So maybe someone else can answer this ? better.

 

alright, that pretty much falls in line with what i was thinking. Thanks for the thoughts.

 

NGK TR6's are a perfect blower/nitrous plug.

 

I've been running platinum plugs for over a year and I haven't had a problem. A cooler spark plug sparks at a lower temp. When you have a blower you need to run a higher octane fuel which burns slower because your compressing more air which leads to more heat. Just like diesels, all that psi makes so much heat it doesn't need plugs and diesel burns slow.
Thats my 2 cents.

 

Oh yea, If your running like 13 or 14.1 compression ratio then you probably would need a cooler spark plug too

 

when would you need to run two steps colder? trying to decide on what i need

 

BR7's...??? Only if your over 12lbs of boost is a good figure

 

not to jack the thread but is there a such thing as too cold of a plug? like if you're n/a and running a plug two steps colder than stock?

 

no but it wont do you any good.