How do i get knock octane modifier to work?

[kenand1988]

how do i get the knock octane modifier to work? I can get inferred octane to show up on my logs but it never changes. I'm on E54
knock octane.pngknock octane2.png

[GSLSE20B]

Turn it on in the advance table

[kenand1988]

Turn it on in the advance table

If you're referring to this table then it was already on

knock octane3.png

[CoreyMS]

back it off to 1 and -1 with initial 1 and try. I've never tried making the numbers larger than 1