Injector opening time

[rr]

I haven't attempted to do any turn off stuff. I don't think it would
be easy to measure just the turnoff.

On the '747 ecm there is a parameter called 'injector bias' that
is added to whatever fuel pulse is calculated. I believe that this
value is to allocate for the cycle time of the injector. As I'm running
at a higher fuel pressure, I figured that they might open slower,
and close faster.

I was looking for data to see how much of an adjustment I needed
to make to the injector bias.

The problem manifested itself as a fuelon/fueloff type of transition
whenever the pulse widths became minimal. Due to the tests, I upped
the injector bias from ~400usec to ~505usec.

This made a big difference in the tuning. . .

BobR.

Peter Gargano wrote:

> rr wrote:
> >
> > Ok, have some data.....
>
> Fantastic info on how long injectors take to open!!!!
>
> Bob, have you got the corresponding turn-off times (?),
> as an educated adjustment of the base pulse times should
> probably take this into account too.
>
> Peter
>

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