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.

That  triggers 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 ignition  to 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

Here is some tracking  data.
RPM  Trig msec  OSC usec
3800...16.............16
4300...14.............13
5000...12.............10
6000...10..............8
7500....8...............6

The osc is way too  high frequency. I need to slow it down.

The trigger is the lower  scope and the osc is the upper  scope.

I am very pleased!!! This is highly doable :) :) :)


Paul Lamar

It is almost working. Here is the current schematic and scope pictures.
Top trace is the output of the CD4018 divide by six counter.
One cycle is the osc gate for six ignition pulses starting at 20 degrees BTDC.
Next trace on top scope is the ignition triggers.
These will be gated so there are only six.
The trace on the lower scope is the processed signal
from the CAS.

All coming together nicely.

One hurdle to go.

I'll have the RX8 running on my ignitions soon.
I will be able to measure the fuel burn with the built in OBD II.

Paul Lamar

The Rotary Engine News Letter. Powered by Linux.
   ACRE NL web site. http://www.rotaryeng.net
   You Tube http://tinyurl.com/beqqxas
   Copyright 1998-2014 All world wide rights reserved.