Re: MAP data...was Re: 48 +1 and sensor data

["Dave Zug." <dzug@delanet.com>]

I have a guess - a sensor that reads the min or the max voltage OUTSIDE a
normal range could interprate that reading to be invalid and act
accordingly. If a sensor reads 0 to 100 for 0 to 5v, and the reading is
zero - is that because there is no vacuum or because the sensor is bad /
shorted?  Nice for the system to be able to know the difference.


----- Original Message -----
From: <dhardin@ovec.com>
To: <gmecm@diy-efi.org>
Sent: Friday, February 18, 2000 9:22 AM
Subject: Re: MAP data...was Re: 48 +1 and sensor data


> Hey this is good information,  I've been tuning my SA table and been
watching
> MAP voltage and RPM and getting pretty close, but I wasn't sure exactly
where
> the vacuum was.  I would eventually get it by trial and error.  I looked
at my
> code and how they derive the MAP in KPA.  It looks like it is pretty
involved.
> It does appear that it is converted to PSI because it is multiplied by
0x97=151
> dec.  This gives a range of 0 to 151.  Is that PSI?  Anyway why is there a
> correction added on: in your case you said it was 10.34.  Why is the
calculation
> y=mx+b?  Would not y=mx be correct.  You are right though:  that is what
is in
> my code: there is a b added on.    I would have thought 0 to 5 volts would
give
> 0 to 100 KPA....doesn't appear to be the case.....anyone know why?
>
>
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