Q: I'm setting op the knock-sensor but I only got a 16MHz crystal with the board, and I see 4MHz is the normal setup.
Q The "knock-chip" has a programmable-divider so it can also use a 16MHz crystal if it is set up, but where to set up/program this divider?
A: You need to recompile firmware with the following line added to my_make: "MY_CONF += -D KNOCK_OSC=16", then the knock chip is initalized with the correct divider for the 16MHz crystal.
Knock-frequency around 7KHz..
Engine: VW 1800 8v. 81mm bore, 86,4mm stroke.