Pretty much.
I've tested this on a Dyno which is where I got the idea from. The MAP was
telling the PCM that it's under a light load and it is leaning out the fuel.
The FMU's that come with the S/C kits can put a bandaid on the problem, but the
solution is to fix the MAP signal first.
- Bernd
> Got ya, so it cuts out the fuel (oviously not all the way, like to a idle
> speed amount) and you run really lean and make no power right? Thats when
> you get that hesitation under part throtlle and more that you all (SC daks)
> are always talking about???
>
>
> TJ
> ----- Original Message -----
> From: "Bernd D. Ratsch" <bernd@texas.net>
> To: <dakota-truck@buffnet.net>
> Sent: Sunday, February 25, 2001 5:38 PM
> Subject: DML: RE: Re: RE: recalibrated MAP sensors?
>
>
> >
> > The MAP Sensor works on a linear scale.
> >
> > On initial Key ON/Engine OFF, it sets the baseline "0" reading
> (atmospheric
> > pressure). Going from idle to WOT varys since the load will vary.
> Voltages
> > are from 1 - 4.6v (on the average)...4.6v being 0"hg and 1.2v being about
> > 17-20"hg. (That's for simplicity's sake...readings will vary due to
> load.)
> >
> > But, the when under boost (positive pressure / +1-2psi), the MAP reads
> above
> > 4.7v which is out of range from the initial "0" reading. This "freaks
> out"
> > the PCM and it registers 30.8"hg (light load/lean condition).
> >
> > - Bernd
> >
> > -----Original Message-----
> > From: owner-dakota-truck@buffnet.net
> > [mailto:owner-dakota-truck@buffnet.net]On Behalf Of TJ Goettner
> > Sent: Sunday, February 25, 2001 5:51 PM
> > To: dakota-truck@buffnet.net
> > Subject: DML: Re: RE: recalibrated MAP sensors?
> >
> >
> > OK, but what casues the Map sensor to read (what is it high boost or
> vac??)
> > what it does when it is actually under boost from a supercharger??
> Anyway,
> > how does it normally operate??
> >
> > TJ
> > ----- Original Message -----
> > From: "Bernd D. Ratsch" <bernd@texas.net>
> > To: <dakota-truck@buffnet.net>
> > Sent: Saturday, February 24, 2001 8:19 PM
> > Subject: DML: RE: recalibrated MAP sensors?
> >
> >
> > >
> > > One problem...if you want to change out to a 2-BAR (or 3-BAR) MAP,
> there's
> > a
> > > lot of extra code required in the PCM for that. From the emails I had
> > > received from three people (who program or have knowledge to program)
> > these
> > > PCM's...it's too much of a pain to try to reverse-engineer them. No one
> > > wants to touch them.
> > >
> > > I looked into this when I first installed my S/C and started looking at
> > the
> > > MAP signals.
> > >
> > > - Bernd
> > >
> > > -----Original Message-----
> > > From: owner-dakota-truck@buffnet.net
> > > [mailto:owner-dakota-truck@buffnet.net]On Behalf Of 1 BAD ARK DKTA .
> > > Sent: Saturday, February 24, 2001 10:10 PM
> > > To: dakota-truck@buffnet.net
> > > Cc: m5sword@aol.com
> > > Subject: DML: recalibrated MAP sensors?
> > >
> > >
> > > Has anyone seen or used a MAP sensor from Electromotive?
> > > They have 3 differnt sensors.....1 bar for normally asp
> > > 2 bar for up to 15 p.s.i. boost
> > > 3 bar for up to 30 p.s.i.
> > > if not i will be calling next week to find out more.
> > >
> > >
> > > Steve
> > > 95 CC 5.2 SLT
> > > MOPAR : "360-Heads" ,cast valve,and breather covers,R/T package
> > > cam,underdrive pulleys,7.5mm sparkplug wires,igntion upgrade(made by
> > > MSD),roller rocker package.
> > > block bored 30 over, forged pistons,K&N 14x3.
> > > series 40 Flowmaster 3" pipes(no cat)
> > > smoothed & painted front bumper,painted grill,Sir Michael's rollpan
> Le
> > > Bra bed cover,16" Centerline Aztec.
> > > 2 DML stickers!!
> > > Best run: ( yes the track is only 1000ft)
> > > 11.92 1000ft
> > > 87.4 mph 1000ft
> > >
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at http://explorer.msn.com
> > >
> > >
> >
> >
> >
>
>
>
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:59:30 EDT