COP Ignition Development

At 4ms the peak current will approach 11.7A. The coils will start to overlap dwell (more than one on at a time) above 3100 RPM.

Excess dwell is detrimental, the driver transistor avalanche protection clamps the peak voltage, that means undesirable dissipation in transistor. Since the secondary voltage is the turns ratio times the primary voltage, it too is clamped. That is why being able to view the transistor collector voltage is important to me. The LSx coils have that point internal, no way to get there.