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MS1-Extra

MegaSquirt This/Next Cylinder Mode
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Only for use with the MS1 Extra code (MS1 - 68H908 based microprocessors)

By Philip Ringwood (daxtojeiro), James Murrey (jsmcortina) and Ken Calver (muythaibxr)

Please Note:

All of these instructions / diagrams are to be used at your own risk, like most things there is more than one way to do the same thing, what we have tried to do is to offer a method that we have tested or that others have tested for us. No warranty expressed or implied.

Use at your own risk.

Next Cylinder Mode

  • Next Cylinder mode sets the falling edge of IRQ (Trigger Angle) for Cranking timing. Cranking relies on the physical position of the trigger.
  • The Spark Output Inverted depends on your wiring of the coil driver and may be Yes or No
  • Next Cylinder Mode does not use Time Based Cranking Timing.

This Cylinder Mode, Time Based

  • The Trigger Angle should be tested with a timing light to give the correct advance during running
  • The Spark Output Inverted depends on your wiring of the coil driver and may be Yes or No

This Cylinder Mode, Trigger Return

  • The Trigger Angle should be tested with a timing light to give the correct advance during running
  • If you are using dwell control make sure that the number you enter in Cranking Advance matches the physical angle of the Trigger Return or the dwell will be incorrect during cranking
  • The Spark Output Inverted depends on your wiring of the coil driver and may be Yes or No
  • Trigger Return relies on the physical position of the trigger (when IRQ goes High)
     
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