The ECU will not continue to cycle as far as it knows the turbine is turning at 64k. The ECU doesn't regulate battery voltage at all it cycles full battery voltage and amps at a high frequency to the plug the same way a power panel on your flight box does. Listen and you can hear the ECU squeal when in the ignition phase. The glow circuit is a very powerful magnetic source that is why a good ground at the plug is very important.