VMAP4 to Bosch PT graph confusion

Ben Swann benswann at comcast.net
Thu Jan 29 22:03:42 EST 2004


I was in fact looking for  absolute pressure vs. voltage graph, but haven't
been able to locate this information on any of the Bosch Pressure

If anyone has this information or a link to it, I'd appreciate it.

----- Original Message ----- 
From: "Dan Cordon" <cord4530 at uidaho.edu>
To: "Quattro List" <quattro at audifans.com>; "Ben Swann"
<benswann at comcast.net>
Sent: Thursday, January 29, 2004 12:58 PM
Subject: RE: VMAP4 to Bosch PT graph confusion

> > I am confused by these graphs for VMAP comparison to Bosch?
> >
> > http://members.cox.net/urs6/VMAP4.features.htm
> >
> > The are supposedly comparing to Bosch sensors.
> >
> > I would be expecting voltage vs. abs. pressure, but both axis show
> >
> > Can some of the enlightened clue me in?
> >
> > TIA
> >
> > Ben
> It looks to me that these charts are comparing the output of three
> common sensors to that of the VMAP4. So, say you already have a great
> fuel map based on a Bosch 2.5 bar sensor, and want to install a VMAP4 at
> 3.1 bar. You'd have to adjust the values of your current map  by the
> difference noted in the yellow line on the bottom chart.
> But for those of us who may start out with a VMAP4 from scratch, having
> the voltage output vs. abs pressure would be nice to have. I'm sure it's
> out there though.
> Once I sort through my 200 20v, I may look at these instead of the now
> rare Bosch sensors.
> -- 
> Dan Cordon
> Mechanical Engineer
> University of Idaho - Engine Research Facility

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