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Message
At about 2000 I adjusted mixture from too lean to too rich, and
nowhere does it smooth out completely
I'm with Dave on this
one. You want the smoothest MAP source possible, and that will mean
connecting all 3 ports, or perhaps just finding the one that works best.
I'm still working on this too. On my latest intake, controller A would run
fine (using a port on one of the TWM barrels), but controller B wouldn't run
below about 2000 rpm (using the other port on the TWM). I connected the
two ports with a T, and not both idle just the same, which may not be as smooth
as A was before I joined the lines. Eventually, I'll get around to
tying both controllers to one TWM port at a time.
Another odd thought I
had was to possibly put a small vacuum reservoir in the MAP port line, for the
purpose of smoothing out the pulses some.
Of course it brings back the recent discussions of you other guys with the
550 injectors in the primary.
I'm currently running four
(blissfully matched) 525 MSD
injectors, and I believe they'll idle OK, if I ever get the MAP port
straightened out. In the previous version, I was using 550
injectors as primaries, and tried 460 injectors to see if they would
help the idle. They made no improvement at all. On the
current setup, I lowered the fuel pressure from 42 to 36 psi (engine off),
and that probably more than made up for the larger injectors.
At 2000 I’m seeing a 13.1 MAP reading. Seems low to me. Is
it?
I'm sure I see similar numbers.
That puts it below the stage point, yet when I turned off the primary
injectors, it continued to run; just rougher. Same effect turning off the
secondaries.
Are you surprised that it continued to
run? The EC-2 knows that you turned off a pair of injectors, and
compensates with the others as necessary. In other words, if you turn off
the primaries, below the staging point, the EC-2 will turn on the secondaries
(which were previously off). Turning off the secondaries below the staging
point shouldn't do anything, since they weren't on anyway. Above the
staging point, the EC-2 will double the injector pulse width to the pair (trio
in your case) of injectors that are still on. If you turn off both sets of
injectors, a hand will come out of the EC-2 and thump you on the head
:-)
Fuel pressure reads 50 psi, TWM tells me it came to me preset at 43.5.
When the coolant temp read 125 when the pipes and rad tanks were just about too
hot to touch, which I guessed to be more like 140. I’m suspicious of just
about every readout. Later when the WT read 140, the CHT TC that measure temps
in and out of the rads were reading about 85. I believed backup gauges
were unnecessary.
Painful as it may be, you're going to
have to verify all your EM-2 temps and pressures before you can believe
them. I mentioned before that my fuel pressure was 42, but read 59 on the
latest EM-2 software. It's reading correctly now that I've done some cal
though.
Oh yeah; the mixture bar reads just about full scale all the time, even when
the engine is about to die from being too lean. I have a different heated
Bosch sensor, which I assumed would have the same 0-1volt range. Maybe
not. Is the sensor output voltage low when lean or rich?
This is something that I've
bugged Tracy about pretty extensively. Mine does the same thing yours
does, and Tracy says his doesn't. I used to use the old gauge that Tracy
sold, and I've done some testing with it, and the EM-2 both connected (verified
not to interfere with each other). When the old gauge reads mid scale, the
EM-2 is about 7-8 bars. Since O2 sensors are supposed to put out 0-1V, mid
scale should be .5V, so I made a variable voltage source, and used it to
simulate the O2 sensor. At .5V, the EM-2 read mid scale like it's supposed
to, and the other gauge read below mid scale. From that, I concluded that
the EM-2 was doing what it was designed to do, but I can't explain why my "mid
scale" mixture is well above mid scale on the EM-2. I tried
using a new sensor, of the same type others are using, and it made no
difference. Now that you have me thinking about this again, I just made a
note to "fix" this in the calibration mode.
Good luck. Don't get
discouraged.
Rusty (caught up)
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