5.3 Ignition settings 5 SETTING UP A BASIC CONFIGURATION
As there is one tooth per cylinder, there is only enough information to run a distributor and untimed injection.
It is not strictly necessary to use both Ne and G wheels. Using both will give you the improved timing accuracy
from the "every-tooth" wheel decoder system, but it is possible to use the "G" input only and configure as "Basic
Trigger" instead. Timing will not be as accurate though.
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 any 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 = Every cylinder
5.3.4.15 Non-missing tooth crank wheel with one cam tooth This arrangement appears on a few OEM
applications, including the Chrysler 318 and 360 Magnum, the Mazda KLDE, and some Toyota JZ engines. Also,
it could be used to extend a simple distributor crank trigger to support sequential. Generally MS3Pro benefits from
many crank teeth to improve ignition timing accuracy. However, with this wheel arrangement, you need to beware
of trying to use too many teeth on the crank as there is a risk of the trigger inputs overlapping as the cam belt or
chain stretches. If this overlap occurs, it will cause sync-loss as the cam tooth moves from being seen "before" to
"after" a crank tooth or vice versa. As a general rule, this mode does not work well with more than 12 teeth on the
crank wheel.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 81
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