About the kit
Full Function Engineering (FFE) builds a crank trigger for Mazda rotary engines using a 36-1 wheel: 36 tooth positions with one missing to mark position. It's available with either a Hall effect or a reluctor sensor, and Haltech ECUs handle both well. Haltech doesn't sell these kits, so buy them directly from FFE or a rotary specialist.
Who benefits most
- FC 13B, 3-rotor and 4-rotor engines: a big improvement over a distributor or cam angle sensor based trigger. Reading position straight off the crank gives the ECU a far steadier signal.
- FD engines: the gain is small, since the factory trigger is already decent. The main benefit is getting rid of trigger problems caused by eccentric shaft end float.
Wiring the reluctor version
The reluctor sensor has two pins and connects to the Haltech Trigger 4-core:
| Haltech wire | Sensor pin | Signal |
|---|---|---|
| Yellow (Trigger +) | 2 | Reluctor positive |
| Green (Trigger -) | 1 | Reluctor negative |
If the signal looks inverted once running, the two reluctor wires are probably swapped.
Wiring the Hall effect version
The Hall sensor has three colored leads, also going to the Trigger 4-core:
| Sensor lead | Signal | Haltech wire |
|---|---|---|
| White | Signal | Yellow (Trigger +) |
| Red | 12 V supply | Red |
| Black | Signal ground | Blue |
Configuring the ECU
Set the trigger up as a 36-1 missing tooth pattern on the crank, with the sensor type matching your kit.
- Reluctor: you'll need to fill in the trigger arming voltage table. The threshold needs to sit above the noise at every RPM but below the real signal, so check it against a scope capture.
- Hall effect: set the sensor type to Hall Effect and choose the pull up and edge to suit.
Either way, set the TDC angle with a timing light before tuning. The Haltech screenshots and a starting arming voltage table for this kit are available: ask us and we'll send them over with advice for your build.
Not sure which sensor type to order? Our Hall effect or reluctor guide explains the trade-offs, and engine trigger systems explained covers the basics. Building a rotary? See 10 things to know about rotary tuning.
