1993lt1

Whats the best plugs and gap for boost.

Lsxford

iTrader: (6)

Well, it depends.
im sure this has been covered before, theres also recommendations on the sloppy mechanics wiki<---- it.
But i use NGK BR7s with out of the box gap (.028?) for lowish boost, like less than 15-16 on my setup. But theres other factors besides boost pressure that should factor in. For a mostly stock engine they will work good less than 18 psi IMO.

truckdoug

iTrader: (25)

i use tr6's for low boost (~12psi) on pump **** 91 and 70/30 water-meth. never had a problem .028 gap.

switched to br7ef right at the end of the season when I upped the boost to 14psi, never got traction for a full pass tho.

Game ova

I will probably get told I'm crazy for this, but I use TR6 with a .28 gap. I've had it as high as 22psi.

handyandy496

iTrader: (9)

All depends on the fuel.

squarles67

Above is from Sloppy Mechanics

1993lt1

Thanks that helps

gametech

iTrader: (1)

Chalk it up to the current craze of boosting high CR motors. I have to admit, though, I finally got peer pressured into using br7's.

forcd ind

iTrader: (7)

I use 7's, ads some insurance, and with a good tune they burn fine, never fouled one, always look good-I gap them 28, but mostly street car, so I prefer a little wider gap.

ddnspider

iTrader: (26)

I run nonprojected 7s. There is no downside only benefit to a slightly colder plug and as long as the tune is good you shouldn't foul them.

gametech

iTrader: (1)

It would be nice to know the "real deal" with sparkplugs now. Since the advent of FI, there are no more worries about fouling a cold plug, so how do you determine if a plug is too cold? Too hot is simple, but where do you draw the line?

truckdoug

iTrader: (25)

when it doesnt hold enough heat in it to self-clean