Trigger pattern issue: 24-1 CAS (OneSix Hall for Datsun 240Z)
Posted: Thu Apr 20, 2023 5:53 pm
Been fighting with this trigger for two days now and not getting any luck with it.
5V hall-sensor conditioned through a MAX9926 w. 5V pullup on VR+ and floating VR- (trialed and tested Hall-input config. on the MAX9926).
CAS in question: https://www.onesixindustries.com/product/nissan-datsun-l-series-crank-angle-sensor
TS settings:
- custom toothed wheel
- Total tooth count = 24
- Missing/skipped = 1
- "On camshaft"
*I can't seem to be able to attach any log files*
Massive sync problems during initial test cranking:
Pulling the spark plugs to get a more consistent cranking speed. Disables fuel/ign:
Perfect sync all the way.
Re-activates spark, attaches one free-hanging spark plug on cyl#1 to strobe and calibrate the ignition timing (Trigger angle advance deg btdc = 645). Perfect sync. Timing calibrates fine with strobe light.
Re-activates fuel (in case of noise) while still having plugs out. Perfect sync. OK, so no apparent noise issues with either Spark or Fuel:
Install spark plugs, re-introducing compression. Massive sync error again.
In desperation, we decided to remove one additional tooth, thus converting to a 24-2 wheel. We then defined "24-2" in trigger settings.
Initially we got no RPM sync what so ever, but manage to get some readings after multiple tries. It feels like the settings dislike having a "2" on the "Missing/skipped" setting:
Everything else is ready, so he's working on getting a 36-1 trigger fitted so that he can get the car up and running.
Would've been nice to have support for the 24-1 CAS though.
... Also, another noe; the engine is set up w. 6x LS coils and direct spark - why doesn't the log show any action on coilState5 and 6?
5V hall-sensor conditioned through a MAX9926 w. 5V pullup on VR+ and floating VR- (trialed and tested Hall-input config. on the MAX9926).
CAS in question: https://www.onesixindustries.com/product/nissan-datsun-l-series-crank-angle-sensor
TS settings:
- custom toothed wheel
- Total tooth count = 24
- Missing/skipped = 1
- "On camshaft"
*I can't seem to be able to attach any log files*
Massive sync problems during initial test cranking:
Pulling the spark plugs to get a more consistent cranking speed. Disables fuel/ign:
Perfect sync all the way.
Re-activates spark, attaches one free-hanging spark plug on cyl#1 to strobe and calibrate the ignition timing (Trigger angle advance deg btdc = 645). Perfect sync. Timing calibrates fine with strobe light.
Re-activates fuel (in case of noise) while still having plugs out. Perfect sync. OK, so no apparent noise issues with either Spark or Fuel:
Install spark plugs, re-introducing compression. Massive sync error again.
In desperation, we decided to remove one additional tooth, thus converting to a 24-2 wheel. We then defined "24-2" in trigger settings.
Initially we got no RPM sync what so ever, but manage to get some readings after multiple tries. It feels like the settings dislike having a "2" on the "Missing/skipped" setting:
Everything else is ready, so he's working on getting a 36-1 trigger fitted so that he can get the car up and running.
Would've been nice to have support for the 24-1 CAS though.
... Also, another noe; the engine is set up w. 6x LS coils and direct spark - why doesn't the log show any action on coilState5 and 6?