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Message
Greetings,
I've taken up enough of
Tracy's time on the phone today, so I figured I'd post this to the list, and he
(or anyone else) can comment.
As I mentioned, my MAP
reading is only 27 on the ground, at full throttle. I thought I had this
isolated to the intake being too restrictive, but Tracy suspects it's more
a matter of the way the ports are positioned on the TWM throttle
body. He also mentioned that someone else (Al, maybe) had the same
issue, with lower than expected MAP readings when using the ports on their
TWM. Is anyone using the TWM TB ports, and seeing near 30
MAP? I sure wish I had documented this little tidbit of info from the
previous version.
I tried to check the EM-2
MAP reading today, but as usual, came away with more questions than
answers. Tracy said that the EM-2 would read MAP using it's internal
sensor, when the EC-2 was off, along with displaying NOP on the RPM
display. When the EC-2 is on, he said it should read the MAP from the EC-2
sensor. There's only one cal, so you can only calibrate one, or the other,
but you really only use one of the sensors, so this isn't a
problem.
So, I turned on the EM-2,
and read 30.0. According to my altimeter, that's probably not quite right,
but very close. Next, I turned on the EC-2. Now, the MAP shows
20.4. At this point, I got excited, figuring the MAP just needed to
be calibrated. I looked at the cals and decided to correct for the "sensor
offset". This will only be meaningful if you're familiar with the later
EM-2 programming. Once I corrected the sensor offset, the EC-2 on reading
was now 30.0, and the EC-2 off reading was 39.6.
To test the range of the
cal, I hooked up a vacuum pump to the EC-2 MAP hose, and pulled about 10 inches
of vacuum. Unfortunately, the EM-2 still reads 30.0. Nothing I could
do with the vacuum line would change the MAP reading, so I have to conclude that
the EM-2 won't read this correctly, even with the EC-2 on, unless the engine is
running. I did try both controller hoses
BTW.
When I realized that wasn't
working, I set the sensor offset back to where it was originally, and figured
I'll just have to put a vacuum gauge in the MAP line the next time I run the
engine. Unfortunately, that probably won't be before Sat.
Cheers,
Rusty (one step from
ordering another SlingShot kit)
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