Updates.
A couple months ago, I tried to use the wires coming from the alternator to see if I could extract a usable signal from the mess of pulses. The alternator is 3 phase so the frequency is 18/3 per rev. Possible to get 6 pulses per rev from the alternator?
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I measured the bolt pattern on the starter clutch and had a machine shop cut me a trigger wheel. I really dread installing it because of the mess I am going to make when i remove the side cover. I got the wheel in the mail today. Bolts right onto the starter clutch. Next job is to find out where I can mount the sensor.
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I need correct crank timing information to the ECU. At the moment I am only providing one of the coil signals to the ECU and fooling the ECU into think it is a 2 cylinder machine so it will run. I think the MAP signal is noisy because as each intake valve opens there is a pulse of vacuum that enters the plenum then tapers off until the next intake valve opens. I think the noise could be smoothed out if the ECU would sample the MAP sensor at the same time on every revolution. And in order to do that it needs more precise crank position information which the trigger wheel will provide.
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Today I was about to crack open the side cover to install my newly purchased trigger wheel and I thought I would give it one more try. But this time rather than measure from phase to phase I measured one phase to chassis ground and wow! I got a nice clean square wave output . I used the coil signal as sync and counted the pulses between and I get a rock steady 6 square waves between coil firings.
I thought I had it licked. The alternator was putting out a very nice square wave signal, 6 pulses per rev. But I discovered at high rpm some pulsed just up and disappeared. Poof, gone! Come to find out the alternator regulator is not a regulator at all. It is brute force short the output to ground if the voltage gets too large. .
So... to feed the ecu more information I have removed the alternator flywheel and added "teeth" to it by drilling holes every 10 degrees. I skipped one tooth so it will have a timing mark to determine TDC of cylinder 1. So there are 35 teeth and one missing tooth. Added a VR sensor to the outside of the alternator cover to sense the "teeth" .The reason for going through this trouble to get better crank position information to the ECU is.. It allows the ECU to filter out spurious variations in sensor readings by sampling them at known points in the rotation and always at the same time on each rotation. It certainly made a difference in the way this engine is running now. This is working much better and think I am actually have a chance of tuning this on the road.
I am anxious to get a chance to ride. I am in the process of adding a bluetooth communications to the ECU so I can log data with my cell phone while riding on the road.
Meanwhile I have a 1999 Connie waiting for attention. I am running several ideas through my mind.
http://gpineau.com/phpbb/viewtopic.php?f=2&t=2&start=30#p46https://youtu.be/GvVWf3nls4Ahttps://youtu.be/oN94ygs3Bio