5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
5.3.4.13 Non-missing tooth cam wheel with two opposite teeth on the cam This arrangement is one of the
variants used in Nippon Denso CAS.
With the cam tooth every 360 degrees this setup gives enough engine information for semi-sequential fuel and
wasted spark. (On a rotary such as the RX7, or a two-stroke engine, full sequential fuel and spark is possible as
the engine cycle spans 360 degrees.)
Make sure you understand the definition we’re using of tooth #1. With the engine rotating in the normal direction,
tooth #1 is the first tooth to pass the main sensor after either cam tooth has passed the second sensor.
Make sure these do not happen at the same time - in the diagram you can see that the main sensor is over
a gap when the secondary sensor is aligned with its tooth. Use the instructions in the previous single cam tooth
section to determine your tooth #1 angle. It will always be between 0 and 360 degrees.
Critical settings include:
• Spark Mode = Toothed Wheel
• Trigger Angle / Offset = 0
• Trigger wheel arrangement = Dual wheel
• Trigger wheel teeth = number of teeth
• Tooth #1 Angle (deg BTDC) = set as above
• Main wheel speed = Cam wheel
• Second trigger active on = Set to make sure this does not overlap with main wheel
• and every rotation of = Crank
5.3.4.14 Non-missing tooth cam wheel with one cam tooth per cylinder This arrangement is one of the
variants used in Nippon Denso CAS. Three and four cylinder versions are known to exist.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 80
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