What affects knock? (what makes a car knock)

[Goat Blower]

You need colder plugs with E85.

[turbotalon1g]

There is hardly any timing in it, its pulled pretty bad.

Really? colder plugs? i thought BPR7ES would be fine cause E85 burns colder i thought a warmer plug would suffice, but i guess i will try 8s.

Thanks guys.