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

[Romans, Mark]

There is no BPW table for the 1989 6E calibration.   You will have to go to
the MAF tables at the gram/sec area where your BL is 118 and reduce
the Grams/sec for that area by the same % that the BL is low.
By increasing the GM/Sec in the under 20 grams/sec area of my calibration
I have brought the BL from 150 at idle to 128.
(Actually now it's in the 120-125 area.)
Mark
----- Original Message -----
From: <timsiford at hushmail.com>
To: <gmecm at diy-efi.org>
Sent: Sunday, September 24, 2000 10:03 AM
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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