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Message
Sorry, didn't make it clearer. I
leave "B" in default as a safety back up. I KNOW the engine will run in
default - so that's my standby in event I really, really screw up processor "A"
while tuning in the air, I can flip to "B" with assurance it will run.
Yes, if below staging and I manual switch off the
primaries, the engine hesitates for a second and I found if I enrichen the
mixture immediately before/after I turn off the primaries, the secondaries catch
smoothly. Yes, then I can turn the mixture back to what I had for the
primaries. The reason for that may be unique to my set up. On that
intake, both the EC2 pressurer sensor lines are connected to the primary runners
(don't ask why - its changed on my later intakes) , the secondaries have 20%
more air volume (larger tubes), I suspect that the processor is setting the
injection timing based on what the primary manifold pressure is asking
for. As long as I am running on the primary injectors, its getting the
fuel it needs. However, when I turn the primaries off and the secondaries
on, the processor is still thinking its providing fuel PW for the primaries
and does not increase the pulse width to accommodate the 20% greater volume of
air in the secondaries (which it had no way of sensing). Therefore, the
initial lean condition when switching to the secondaries. At least thats my
theory/story and I'm sticking to it.
Ed
Hi
Ed,
Thanks for
the test offer. I have to admit that you lost me with your reasoning for
leaving the B controller at the default. I can't leave the B controller
at the default, because it's too rich to run below about 15" MAP.
I also adjust the program value to leave the manual mixture knob at
12:00. At this setting, when I turn off the primaries (MSD's) around
idle, I have to turn the mixture knob all the way down, and it's still a
little too rich running on the Mazda 550's.
Since you
have matching injectors, you would expect to be able to turn off the
primaries, and have the secondaries run at the same mixture setting. In
the past, you've mentioned that you have to enrichen the mixture before
turning off the primaries, or the engine wants to lean out and die. The
question is- do you have to leave the mixture richer than 12:00, or can you
turn it back to 12:00 and still run fine on the secondaries
alone?
Tracy, is
this a valid test? In other words, do the primaries and secondaries get
the exact same pulse width when running by themselves below the staging
point?
Thanks,
Rusty
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