What is the absolute min. timeframe for a P-n-H TBI injector say at 13-14 volts?

 

good question, I have been searching for too. I read on one of these posts that the sPW shouldn't be as low as .8ms @ idle, so I guess under 1ms?

Someone knows

 

possibly related to fuel pressure? My data logs at 20 lbs FP with 80 lbs injector shows about 1.0 msec at 825 rpms in OL. So maybe .90 is the bottom #. It appears VAFPR is the answer to getting decent idle control and yet fuel up top.

 

I get idle instabliity at around .90 millisec.

 

Here's a pic of two different pulses one after another at what I believe is the switch point from synch to asynch. The first is about 8-9 msecs to current peak and the second is about 4 msecs. What changed in the injector to warrant the smaller ramp? Heat?