amp e MS3Pro ULTIMATE - FC Mode; FD Mode

7.3 Ignition Settings 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
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
7.3.11.2 FD mode The third generation RX-7 retains a wasted spark coil for the leading plugs, but the trailing
plugs are individual logic level coils. As with FC mode, “number of coils” needs to be set to “wasted spark.”
Ignition wiring:
• Spark A Leading coil (IGt-L)
• Spark C Front trailing coil
• Spark D Rear trailing coil
Note that FD mode does not use spark B - this is done to match the RX8 mode. If you ever convert to coil on plug,
this means you only have to change one wire instead of three.
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 MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017 Page 182