I have the thin black siemens 60's. I talked with a guy today that stated the injectors become "non-linear" under 1.50% duty cycle. Which matches what i've found.
My car does not have a cold start valve anymore, which i'm sure isn't helping matters. But I have been holding the throttle slightly open for a few seconds after cold start to help it stabalize. I may do an on-off valve for cold start, we'll see.
This thread has become so huge that it is easy to get cunfused, I'm so glad to have control of timing fully.
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