RE: 2 bar map sensor

[John_Calabrese@ENGELHARD.COM]

The new LS1 motors MAP sensors are 0-5 volt.  I kow this because when I was at
school I was team leader for the ethanol vehicle challenge, which converted an
LS1 to run on E85.  I also built about 5 of these motors, and designed and built
and installation kit for a vortech s-trim supercharger (have picsif you want to
see them).  I also know every table and map inside the 1999 truck ECU.  What we
did was to epoxy a 90 fitting where the MAP sensor was, and run it to an older
style map sensor.  Then we reprogrammed the map by using a mityvac and writing
down the volts out @ certain pressure (absolute). Seems to work fine, were
making 12 lbs of boost, setting no codes, running 5.5 g/s custom siemens
injectors, and on a 4.8-L, making about 400+ hp.  I also have a complete set of
shop manuals for the truck (spoils of being team leader).  Let me know if I can
help with the Ls1.






"Michael Adams" <michaeladams1@compuserve.com> on 02/04/2000 02:20:47 AM

Please respond to gmecm@diy-efi.org

To:   gmecm@diy-efi.org
cc:    (bcc: John Calabrese/ETG/ENGELHARD)
Subject:  RE: 2 bar map sensor




What I would like to do is reprogram the ECM to compensate for the 2 bar
sensor, and add boost retard for a supercharger.  Is this possible on the
new ECMs?  I also wasn't sure if the range of voltages produced by the new
MAP sensors was the same as the old ones. (ie. full scale being say as a
example 0-5 volts).

Michael


>
> They will sorta work.  But the pcm should set an error code.
> The program will think the values are way out of line, since
> it is expecting
> a 1bar MAP signal.
> Grumpy
>
>
>
> > Will the two and three bar sensors work on newer engines,
> such as the LS1?
> > I notice those part numbers go back to some pretty old engines.
> > Thank you.
> > Michael
> > > Anyway people are always asking about MAP sensors, part
> numbers, and
> > > applications, it's all there now, go to www.diy-efi.org,
> > > click on GMECM,
> > > then click on "GM sensors".
> > > --steve
>
>
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