Trigger Reference Tooth table

This table specifies which trigger teeth represent each ignition event from the Ignition Output Table.

It is recommended to have tooth 0 on top, it will make the system synchronize to the engine quicker and initiate fuel and ignition events.

This table is traversed backwards just as the Ignition Output Table.

Example settings for auditrigger: (last three rows not used)
0: 0
1: 72
2: 54
3: 36
4: 18
5: 0
6: 0
7: 0

Special configuration for rotary trailing spark

Full trailing-spark support is implemented since firmware 1.1.77 for these types of engines:

Rotary (usually 2 or 3 rotor Wankel engines) or
Twin-sparkplug

With the latter system there are usually 4-8 cylinders where each cyl has 2 sparkplugs (many Alfa-Romeo). Low trailing spark delay is common here (often just a 0.5 degree to be softer on the harness and supply and for less electro-noise).

Important note for benchtesting: remember to generate double RPM, eg. "10000 RPM" signal when you want 5000 RPM signal for a wankel/rotary. Reason: the mazda wankel has 1 sectrig pulse every 360 degree. While the signal generators assume 1 sectrig per 720 deg. (eg. VemsTune Tools / Play trigger).

Rotary trailing spark configlet examples

Below we assume 12 primary trigger pulses for 1 secondary trigger pulse, but almost any other trigger should work (including missing tooth and even subaru/fiatstilo which does not allow HALL-dirac filtering, but works with rotary).

Adjust everything (including ign_tdcdelay) for the leading spark
then configure reftooth=128 for trailing spark

This means : timed from the same tooth as the leading, just with the configured RPM-dependent delay, and using different output.
In practice every second reftooth will be 128. The first (topmost in VemsTune) must not be 128 ... normally 0 anyway for faster sync.

2 rotor example

(note: hexadecimal 80 = 128)

ignout2 and ignout3 are leading sparks (at 0 and 6 tooth offset respectively). The trailing spark is wasted spark on ignout6.

Another_trigger_tooth=06
h[1]=00 80 06 80 ...
h[2]=20 60 30 60 ...

3 rotor example

(ignch 2,3,4 are leading, 5,6,7 are trailing)

another_trigger_tooth=04
h[1]=00 80 08 80 04 80 ...
h[2]=20 70 40 60 30 50 ...

The delay is adjustable (0..63.75 degree) in function of RPM
Note that the definition of degree is not as self-evident as for the alternating piston engines.