<< Previous

MS1-Extra

MegaSquirt This/Next Ignition Mode
Distributor Ignition trade-off

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.

The three waveforms on the previous pages represent three methods of operation using a distributor. These tradeoffs are for distributors with Hall sensor or Optical sensor. This does not apply to a crank trigger wheel or a VR sensor.

 
Installation
Timing accuracy

Next Cylinder mode,
Trigger Return
  • Requires fixed shaft of distributor.
  • Required sensor location may be the same as existing timing
  • Excellent cranking/starting
  • Good running

This Cylinder mode,
Time Based cranking
  • Requires fixed shaft of distributor
  • Sensor must be at 50º to 90º BTDC
  • Possible modification of advance plate required to set Trigger angle
  • Very Good cranking/starting
  • Very Good running

This Cylinder mode,
Trigger Return
  • Same as This Cylinder mode above plus
  • Possible modification of Trigger Wheel required
  • Excellent cranking/starting
  • Very good running

 
Next >>