Different sized injectors are handled by the Mode 6 (
Secondary injector differential adjustment)
This was added around 2005 so if you haven't had an update since then you may not have it. See your installation guide to see if it is there.
The injector backup mode is problematic with different sized injectors because as Bob pointed out, the EC2 does not know which ones you are running on when one set is disabled. Mine still runs on either but requires a healthy adjustment of the mixture control when going to backup mode.
Tracy
On 8/14/07, David Leonard <wdleonard@gmail.com> wrote:
Hi Tracy (or anyone in the know),
I have what I hope is a quick question on how the EC2 treats different
sized injectors. I finally got my engine running again and am trying to
re-program the computer now that I have Ed's EFI monitor and I also
installed injector disable switches. Those (particularly Ed's engine
monitor) are powerful tools! I could see right away several holes in
my map and that I am hitting the limits of the mode-1 compensation.
Anyway, to make a long question shorter, how does the EC2 treat
different sized primaries and secondaries (as told by the setting on the
corresponding mode setting)? Does it:
A) Adjust the relative pulse duration of the 2 types of injectors so
that they are each contributing 50% of the fuel.
Or
B) Keep the pulse duration the same for all injectors but then reduce
(or lengthen) that pulse duration above the staging point to compensate
for the Larger (or smaller) secondary injectors. The larger injectors
would now be contributing a relatively larger portion of the fuel.
Or
C) Something else.
If the answer above is 'B' (which makes the most sense to me), then the
follow on question is: Does the 'cold start' switch double that pulse
duration regardless of which injectors are shut off. (such that when
the larger injectors are shut off, the net fuel is going to be somewhat
decreased compared to when the smaller injectors are shut off)?
Thanks
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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