Well been using safcII a while now and starting to under stand it a bit more.
I set base knock on a day that was about 20degC it was 150. Apparently in colder weather you will have more knock so the base will be different.
Ok once base is set knock values will be shown relative to this. The net says you
can ignore around 60 knock. Although one day I saw 50 knock register at about 4500 revs that almost stalled the engine but I did hit a pot hole on that occasion.
My worst cold weather was at 13C temp I hit 183 knock at 4500rpm at 18psi in auto 3rd but was only 45knock at 5570 in 2nd gear so engine load can be a factor. The 183 occured when the gear auto changed and boost suddenly dropped 2psi I also lifted the throttle so lift off knock may be involved which means little fuel in the cylinder so this knock is not such a problem.
Up to 5500rpm I have seen safc knock values that get larger with engine load and change with revs and temperature. Its not an exact figure but shows when somethings changed. eg Normally I would see zero knock even at 20 psi up a steep hill in 2nd below 4000 rpm thats what I tune for, I think the knock issues to avoid most are ones above 3000 rpm.
In summary I would say keep it under 50 knock with a similar 150 base would be good but if you have a ratterly engine like mine you will see lift off knock at much higher levels.
