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Message
Is it that
there isn't enough adjustment range using injector
pulse timing to
accomodate both an idle opening time and max boost opening
time?
Hi
Ernest,
Sounds like you
understand it all. I do believe this lack of timing range is the problem,
and correct again that it's much less of a problem with a NA
engine.
For any fixed fuel
pressure, you can certainly get injectors large enough
to deliver the fuel you need at max boost. The problem is that
they will now need to open for the smallest possible time at idle to
deliver the tiny bit of fuel that's required. All injectors have a
certain amount of time they need to physically open and
close. During the time they're in transition, some fuel is still
being transferred, so that factors into the timing as well. It's pretty
easy to get to the point where the pulse width is too short to work
reliably, which causes inconsistent fuel metering, and keeps you from
having a smooth idle.
Staged injectors help
this considerably, and I believe Tracy has the ability now to use different
size primary and secondary injectors. You might could use a
smaller primary, and a large secondary if you got desperate.
BTW, the FD does in fact use 550 primaries, and 850 secondaries. Anyone
know what the Renesis uses?
I'm attempting to implement a returnless system that will be referenced
to
atmospheric pressure.
The big question
is, "Will there be enough timing adjustment range
in the EC2 to allow
the injector pressure to remain constant?"
That's
what test stands are for.
Amen :-)
Rusty (teaching Wendell a cheap lesson
about believing everything you read <g>)
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