7.3 Ignition Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
This allows increasing the knock threshold at low coolant temperatures. Many engines are noisy during cold
operating due to increased clearances. This would result in false knock reports if the threshold was not raised at
low temperatures. Ensure that the final row is 100% for a warmed up engine.
7.3.11 Rotary settings
The MS3Pro supports Wankel rotary engines with a leading and trailing spark plug split. Versions supported
include Mazda’s RX-7 FC, FD, and RX8 ignition types, as well as 3 and 4 rotor engines with coil on plug. To enable
this screen, “Engine Stroke” under Engine and Sequential Settings must be set to Rotary.
The “Allow negative split” setting lets you fire the trailing spark plugs before the leading (positive split numbers
have the trailing spark plugs fired after the leading). You can also set a separate dwell time for the trailing coils.
Note that all rotary modes have you set the number of injectors to the number of primary injectors; a 2 rotor engine
would have the number set to 2, even though there are a total of four injectors, two primary and two secondary.
Here are the output modes available.
7.3.11.1 FC mode The second generation RX-7 used a logic level wasted spark coil for the leading plugs and a
coil that had a “coil select” mode for the trailing coil. FC mode requires setting “Number of coils” to “wasted spark”,
and uses this wiring.
Ignition wiring:
• Spark A Leading coil (IGt-L)
• Spark B Trailing coil (IGt-T)
• Spark C Trailing coil select
Fuel wiring:
• Inj A Front rotor primary injector
• Inj B Rear rotor primary injector
• Inj C Front rotor secondary injector
• Inj D Rear rotor secondary injector
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 176
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