MicroSquirt.com read only forum (Jan.15,2018)

Sorry, I forgot to mention that I am using the v3 PCB.

Okay, I gave it another try today with the MS connected to MegaTune. No cranking is detected by MS-II, although the Hall signal is going to MS. As someone took the Scope out of our shared garage, I did not have a chance to look at the signals on pin 5 and 6 if the ignitor module.
The next thing I would do now, is try to hook up the signal from pin 6 to MS-II and have a look what happens, but to be honest, I would like to hear a reason why this should work and pin 5 should not, first.

Okay, today at lunch i took a spare distributor that I removed from my Saab some time ago and figured out the connections to the Bosch ignition module. As it seems now, there is a mistake in the wiring diagram for the Bosch ignition module in the MS-II manual. At least the diagram does not work for the module I have installed in my car.
Pin 5 is the supply voltage going to the distributor, while the Hall signal is wired back to the module at pin 6, and is switched between ground and 12V. I thought this might be interesting for others, as well.

Cheers,

Tadek

It may be a good idea to start a fresh thread for this discussion as this was 'stickied' to be used as a reference for others and we probably shouldn't start a new discussion in it. Maybe Lance can split this off into a new thread for us.

Are you pulling the ignition input signal directly from the hall sensor? Is so then for the hall sensor in your distributor what's the VREF voltage? 5v or 12v? If it's only 5v then you'll probably need a pullup to 12v through a 1k resistor on your ignition input to pin 24 to get it to read the RPM signal properly.

I had setup my timing and got it running but everytime I took it out I got bad detonation as soon as I went into boost. Played around with the setup for awhile had timing down to 16 and still pinging !

Switched back to the locked distributor at 22 degrees and ran fine. Turned out the distributor needed to be phased - rotor now points directly at tower #1 at 22 crank degrees. I did this by moving the old vacuum advance plate I wasn't using anymore and welded it into place. A hole in the distributor allows you to use the timing light to see where it poins. EVerything works good now. So that's another thing to try if you are having problems !

Final settings for a Mallory Uniliter converted points distributor feeding MSII v3.0 Software 2.23 driving a Crane ignition box via the IGBT driver circuit:

Trigger offset: 49 deg
Predictor algo: Last Interval
Gain 10 %
Rising edge trigger
Standard coil charge
spark output going low (normal)
Max spark duration 20 ms
Dwell 25.5 ms.
Also had to add a 1k pullup resistor on both the input and output.

Not sure what I'm doing with the dwell and spark duration, but any other values (ie reducing one or theother or both proporionallY) goofed up the timing and car didn't run as well. Hope that helps someone

Lance,
In your post of 27th September 2005, you had a drawing of the high
current driver and a pull up resistor. Shouldn't the resistor be connected
to the gate, or am I missing something?

Dave.