Ok, guys, interesting tuning thing found with the vampire unit and knocking. Keep in mind that the knock sensor brain does not even activate till it see's 5psi vacuum
Here's my borderline knock table. Decipha stated that MBT for aluminum heads at low load cruise was 45. I know there is lots ov other variables, but that is where I kind of adjusted my spark around.
Son, here is my histogram showing knock. I had to step on the gas at just the right moments, but have a look:
Red is bad. lol Red is knock, or false knock?
So, this tells me that you can actually touch on low load areas in transition to high load right from the base. How could I have a low load condition under low vacuum? Well here it is, you clearly can.
With the vacuum port off the Vampire brain, it it always sensing, and this knock does not happen under cruising conditions. Only quick transitions to wot while the vehicle is already moving.
.So, I reduced timing in the offensive area.
I didn't log after this, but I did end up going for a drive. I can tell you for certain that this helped quite a bit. The Vampire unit is still retarding timing under certain conditions, but far less. I may very well end it at the factory timing (Numbers are black) in this area when I am done.
I don't want to make any further changes to spark till I actually log what rpm/load the knock is coming from. No point in guessing at this point.
Very interesting, and worthy of pointing this out. Once I'm thru this process, I know there will be absolutely no reason to visit a dyno to find more power.