Re: BPW and Cylinder Vol.?

["Jeff M" <tystorm@email.msn.com>]

For your mention on getting better results on lowering/correcting the IC but
still having some other issues, also look to lower the minimum base pulse
width so your program can lower the fueling at low loads such as idle and
decel.  Also, msec BPW threshold to learn in all cells as this will of
changed with larger injectors too.  also msec threshold between cell 1 and
cell 2, msec bpw threshold determines cell 1, msec min and max async pulse.
Bob mentioned lower the prop (proportional?) gains before going back to
closed loop operation and final tuning and I am wondering the prop gain of?

Jeff M


> In my case i'm starting from scratch, 468cid, single-plane port fi, cam,
heads, headers, etc.  I
> just discovered last night that lowering the injector constant has leaned
me out enough that I can
> start doing some real VE tuning.  It's doing some weird things, tho.
>
> How would u force open-loop all the time?  I suppose locking the BLM at
128 would help.
>
> Squash
>
> --- rr <RRauscher@nni.com> wrote:
> >
> > I'd put the proper values at those two location according to what is
> > really in the engine for displacement and injectors. Then use the VE
> > tables to correct the afr. If you have changed the cam, the exhaust,
> > or the intake, the ve has changed.
> >
> > For some reason, I think the cyl vol is used in the egr calcs.  ECM
> > needs to know gms/sec of airflow for egr lookups.
> >
> > You can rough in the VE tables by tuning in forced open loop, then
> > fine tune them with closed loop. Don't forget to reduce the prop
> > gains before the closed loop tuning.
> >
> > BobR.
> >
> > I've been thinking that a spin machine would be nice to get the VE
> > measured close enough. . .
> >
> > Squash wrote:
> >
> > > On AUJP/ANHT, has anyone experimented with the values at 6dd?  It is
the cylinder volume (one
> > > cylinder).  I imagine that the AFR is determined from 6dd and 41a?  If
I lower 41a only, my
> > > commanded AFR goes leaner, but i haven't tried to move 66d.  I would
imagine that they should
> > move
> > > at the same percentage.
> > >
> > > Squash
> > >
> > > =====
> > > Trains, Trucks, and EFI at
http://www.trailrunners4x4.org/users/realsquash
> > >
> >
>
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>
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