- Sun Nov 22, 2020 9:48 am
If, for a moment, I consider your crank speed slowing down to be a normal behavior, my solution would be like this:
Position the relevant tooth on your crank at a position where the crank speed is high during cranking.
Compensate for this in TS, so the ECU calculates TDC from that position.
Now enable fixed pre-ignition for start-up.
Last step is to find an ignition point where your engine starts.
What the ECU does now: You have a stable cranking signal and the software calculates TDC. After the engine fires on the calculated point, everything goes as usual. The triggering tooth does not have to be at TDC. Maybe you did not realize this?
As I know more Duc engines starting with inductive pickups than with out, all working fine, maybe find another solution in fixing things causing this problem?
There could be many cause for your problem, not directly connected to Speeduino stuff:
Worst idea, there could be some kind of defect in your engine bearings. I had engines that still turned well without compression, but slowed down with plugs installed.
I suppose you did not reduce the flywheel mass? This has the same effect. Engines don´t start with to low rotating mass.
Then some other ideas to check:
Ground connection battery/ engine/ frame. Cause for the funniest problems, not realized by the smartest engineers, until anything else was renewed for xxl $.
Some with wires and connectors in the positive rail.
Magnet switch in the starter assembly worn out. In this case starter measures fine, but has no power. Check by bypassing.
A single winding in the starter burnt out. Starter seems to work normal, but was no power.
Bearings of the starter gear worn out.
Quite some things to check.
Don´t rule anything out, just because it is inconvenient to check until you have proved it is not the cause!
Vehicles with high use have defects from wearing out, those with very little use suffer from not being used. Those in between both conditions break down just for the fun of it... So never speculate, but check!