Is the 4x signal fine enough for good resolution?
It should be (many cars with distributors have only one trigger per period like this), and if I understand correctly I think the factory ECU must do it this way too.
So in setup wizard I'm looking at:
Ignition/Injection: piston 8 cyl, 12345678, single distributor setup, dwell ?, offset unknown, 90 angle
That looks correct. We usually try 3ms dwell to start with, but sometimes it needs to be adjusted a little. The trigger offset is best determined with a timing light once the ECU is wired up.
There is Angle increment, trigger mode, and reset 1,2, and 3 so
increment is 90 degrees (4x)
trigger mode is generic multitooth
reset 1 is none/swap 2 and 1
reset 2 is cam is missing tooth (on cam) = first half only
reset 3 is none
We can finalise these settings closer to the time, but I think it will probably be something like:
- Angle Increment = 90 degrees
- Trigger mode = generic multitooth
- Reset 1 = none
- Reset 2 = 'cam (inc phasing) on next crank trig', or maybe 'first half only'
- Reset 3 = none
And anything beyond that is in firmware? So if I do eventually try to use the stock crank sensors as triggers that would require a firmware upgrade?
If you retain the existing setup with the crank/cam sensors and the DIS, I think it will work with the current firmware package. If not, we will add a new trigger mode for it if necessary, but I think it will be OK already.