The time the trigger points are closed has nothing to do with the pulse length-the ECU calculates that. The trigger point closing triggers the injection event. Also the particular time during the revolution the injector is fired is not critical-as engine speed increases it becomes less and less relevant. What is important is that the ECU gets a strong, clean signal from the trigger points.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT