what is KNock retard fuel?

[blackgp2006]

iam getting KRF about 1.5-2.5 on my hemi 6.1
iam running to rich or to lean?
at about 4-6k the lowend is okay iam thinking perfect..

[Vas@Diablosport]

you might try adding a slight bit of WOT fuel to get your KRF back down to 0. It should feel a lil' nicer too...