Here it is. The down going slope on the lower trace is
the trigger for firing the smart RX8 coils. The RX8 coils
are energized by a 2 msec pulse from the stock EFI computer.
When this pulse shuts off the coils spark the plugs.

Thattriggers the analog tach CMOS 555 one shot circuit that
generates the control voltage for the KA331 voltage to frequency
circuit. These pulses in turn trigger the Lamar Instruments high
speed CD ignitionto fire roughly every 5 degrees.

More work to do but this is the hard part.

Thanks to David Josephson for all your help.

Paul Lamar

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