Nissan Timing Wheels
The first cut of replacement timing disks has been done, and is documented VehicleFitment/Nissan/SimpleTrigger
In an attempt to 'normalise' the various Japanese trigger wheels to the 24 pulse (12 pulses per crank revolution) and 'n' sync (0.5, 1, 2...) - as used by Toyota, Honda, Mazda RX7. A candidate for the S13, S14, S15, also Z32, and later engined Skylines has been drawn.
We are going to have to run this trigger type on the Nissan S13 200SX as the Simple trigger will not work (due to an error in my calculation of the slot offsets)
Please advise on the trigger settings for this system currently calculated as being:
- primary_trigger=07 # coil type, filtering, rising edge.
- secondary_trigger=19 # camsync, rising edge.
- tooth_wheel=18 # decimal 24 tooth (between cam pulses)
- trigger_tooth=01 # or upto 05
- ign_tdcdelay=B4 # 90/0.5 = 180 (half degrees)
- another_trigger_tooth=06 # 24 tooth/4 cylinders
- tooth_wheel_twidth2=00 # No missing tooth
- tooth_wheel_twidth1=78 # decimal 120 (30deg / 0.25)
- rpmk[0]=0b
- rpmk[1]=b8 #RPM constant for 4 cyl = 3000 (=0x0bb8)
- alternate=13 # injgroups 3..0 (fire all banks during cranking)
- ignchmax=03 # ignition 3..0
The bits I am not sure about are:
- cam_sync_r_edge_phase=33 # What does this mean?
- cam_sync_f_edge_phase=46 # What does this mean?
- reset_engphase_after=40 # since 720/0.25 = 2880%256 = 64
- h[1]=00 12 0C 06 00 12 0C 06 # another_trigger_tooth=06
- h[2]=10 30 20 00 10 30 20 00 # Firing order: 1, 3, 4, 2
Tested with 1.1.18 using the above settings, and it worked fine. OK, great. Can you publish more detailed mcd dump? This would be some hint about the idle air-valve and the warmup enrichment requirements of the intake and engine (tables are too custom-setup-specific anyway, and h[1] and h[2] are already published above).
And now laser cut
It will also be possible to get triggers for the GTiR SR20, S12 CA18ET, and KA24E which have much larger diameter trigger wheels.
History and Detailed Information
Having looked at the Nissan Silvia and 200SX models (S12, S13 and S14) they all use a cam driven timing wheel with a speed sensor of 2degree resolution and portals of different sizes to denote the current cylinder.
Nissan S14 Coil on plug
Now documented in
Having checked the wiring pins relate to the schematic:
