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Today I swapped out my plugs and figured I'd try a range colder..NGK BKR7E's....AFR's quickly drop to low 11's when going WOT then jump up and hold a rock steady 12.5-12.8. To say the car pulls harder is an understatement, its a totally different animal. What really has me intrigued is that when I ran a 13.7 quarter it was with a 10.2 AFR and the car felt the way it always did.
It never even occurred to me to try a colder plug, up until today the best plugs I used were OEM's, it ran better with them than any plug I tried before it so they're all I've run for the last couple years. And they never really looked burnt/fouled when changing. After today.......I'll never buy them again.
