Ernest,

It is good that the inconsistencies I noted in your data can be explained by the limitations of the tests themselves.  That makes it much less likely that there might be problems with the rest of the fuel system.  I hope that my remarks weren’t taken as overly critical or negative.  That certainly was not my intent.

As you stated, the “turn on time” that you got from the reproducible tests is very reasonable.  It agrees with values I’ve measured and with values I’ve seen reported elsewhere.  Demonstrating the good match of your injectors is also very useful.

It’s my opinion that the time and effort you are putting into these tests is very worthwhile in terms of understanding your system.  The fact that you are having fun doing it is even better.

Steve

…

I did run the numbers on the two test runs that were repeated several times.  The 400-20msec, and the 1600-5msec samples.  The injector turn-on time came out to be 1.152msec.  "turn-on time" being defined as a derived number that represents no flow out of any given cycle time due to the cumulative effects of opening and closing the plunger.  The number is suspect, but very reasonable.  The default tune setting for this parameter in the software is 1msec.

The other useful indication from this test was that the paired injectors are flowing equally.  Regardless whether I was spraying the counts or cycles I thought I was spraying, the fact is that the driver circuit handles both injectors in the bank equally, and they are supplied from the same rail.  Even if I misread the volume, the fact that they're at the same line says the flow rate is equal.

If ya'll ain't noticed, I'm having way to much fun here.