@Adrian! posted:Tiny note. Remember that a TVS looks like a "C" when it's not in conduction, and a 22uH choke looks like... well a 22uH choke. So when these things are placed closely together you're making an LC, which has issues...
The TVS suppresses voltages by very quickly going into conduction creating a giant current change. The inductor's physical nature is to reject fast current changes (V=Ldi/dt), so having the choke before the TVS would render the TVS less helpful since it can no longer respond fast in series with the choke. You'd want the TVS across the track first (so you have to suck up the capacitance hit), and then the choke in series with the electronics behind it.
Well, I am trying to protect the electronics in the engine, so why is the TVS less effective? The TVS will clamp any voltage in excess of it's rating, the speed of the ramp-up doesn't seem to be a major issue. I must be missing something (and probably am). 
