Part Throttle tuning for MAF (was MAF tables have a max of 255)

[Romans, Mark]

Initial fuel*(BLM/128) = adjusted fuel.
So if the BL is 135 and the maf is reading 50 grams/sec then you need to add
about 5.5%
to the grams sec maf calibration for the area of 50 grams/sec. So it would
be 52.73 grams
sec instead of 50 grams/sec.  I would also skew the area around the 50
grams/ sec area
upward a bit too.  If the whole map is reading like this then you can either
change the injector
constant or raise or lower the fuel pressure.
(I think my math is right)
Mark
----- Original Message -----
From: "JN" <jwn at sgi.net>
To: <gmecm at diy-efi.org>
Sent: Monday, September 25, 2000 5:11 AM
Subject: Re: Part Throttle tuning for MAF (was MAF tables have a max of 255)


> I may be way off here but I think to do what you want you have to modify
the
> MAF tables.  The MAF tables contain values that tell the ECM how much air
is
> being ingested in the motor. If the MAF is ported, these figures become
> skewed.  There is no BPW vs load as you mention that I know of.  The MAF
> should calculate that on its own.  Again, I'm kinda new at this so I might
> be way off.
> Please let me know what you find out since I have an 89 Corvette that I am
> building a 396 for with a Super Ram.
> Jason Norris
> ----- Original Message -----
> From: <timsiford at hushmail.com>
> To: <gmecm at diy-efi.org>
> Sent: Sunday, September 24, 2000 1:03 PM
> Subject: Part Throttle tuning for MAF (was MAF tables have a max of 255)
>
>
> > Hmmmm,
> >
> > How come the $32 and $32B code both have a BPW Fuel vs Load (g/sec) and
> > the $6E does not?  Or, is it just that TunerCat shows the BPW table in
the
> > $32 and $32B but not in the $6E?
> >
> > The reason that I am asking is this....
> > With an '89 corvette TPI (heads/cam - 165, $6E), Diacom reports a BLM of
> > 118 at 1500rpms with a load of 40 g/sec (diacom actually reports 4000
but
> > I assume they really mean 40?).  This is NOT at WOT.  I'd like to be
able
> > to modify the image so that the BLMs are close to 128 almost all of the
> > time.  If I had a $32 or $32B I would adjust the BPW vs Load (g/sec).
> However,
> >  this table doesn't exist in the versions of the $6E calibration file
that
> > I have for BOTH TunerCat and the Demo GMEPRO.  Am I missing something
> here?
> >  How do you tune part throttle closed loop operation on MAF '89 code
> ($6E)?
> >  Can anyone shed any light or help out here?  The speed density setups
are
> > a cinch.  But, there doesn't seem to be any documentation on the
internet
> > or in the diy-efi archives on how to tune PART throttle on the MAF code.
> >
> > ANY help is GREATLY appreciated.
> > Tim
> >
> >
> > At Sun, 24 Sep 2000 10:49:57 -0400, "JN" <jwn at sgi.net> wrote:
> >
> > >
> > >It can't be changed but from what I know it can be fooled.  Use the
> > >PE vs
> > >RPM table to add more fuel in the upper RPM's.  The MAF is used mainly
> > >from
> > >what I understand in closed loop non PE driving modes.
> > >
> > >Jason
> > >----- Original Message -----
> > >From: <timsiford at hushmail.com>
> > >To: <gmecm at diy-efi.org>
> > >Sent: Saturday, September 23, 2000 8:29 AM
> > >Subject: MAF tables have a max of 255
> > >
> > >
> > >> Quick question:
> > >> I know a fair amount about speed density setups (730) and am doing
> > >my best
> > >> to learn the MAF setups ($6E / 165).  Why is the maximum MAF value
> > >= 255
> > >> and can this be changed?
> > >>
> > >> Tim
> > >
> > >--------------------------------------------------------------------
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